Newsgroup sci.polymers 8558

Directory

Subject: Re: Transparency films for laser printers -- From: "Michael A. Jar"
Subject: Re: compression-after-impact-testing -- From: jcolt@scsn.net (Rob&Jen;)
Subject: Re: Polyurethane Foam -- From: Brent Viers
Subject: Coupling agent for SiO2 in epoxy? -- From: thomashawk@aol.com
Subject: World Premiere -- From: jkoster
Subject: Mystery Polymer (PNIPAM) -- From: derekh@aloha.net (Derek Henderson)
Subject: Pipe coating with epoxies. -- From: "Tony Warren"
Subject: Re: Abrasion Resistance -- From: Alec Ganopolsky
Subject: Acryloids -- From: Bas de Vries
Subject: Re: Thermochromatic Effect -- From: dsmall@pcisys.net
Subject: Re: Thermochromatic Effect -- From: dsmall@pcisys.net
Subject: JOB SEARCH [posted weekly] -- From: "Amrish K. Lal"
Subject: Salt removal from styrene copolymers -- From: Craig Spink
Subject: Re: Electron Beam Curing -- From: tony2@bellcore.com (Antoni S. Gozdz)
Subject: Re: phenol formaldehyde -- From: tony2@bellcore.com (Antoni S. Gozdz)
Subject: Re: Measuring fluorine treatment of polyethylene -- From: tony2@bellcore.com (Antoni S. Gozdz)
Subject: Re: Need Good Cold Bonding Adhesives for Silicone -- From: tony2@bellcore.com (Antoni S. Gozdz)
Subject: Re: Looking for info on PE Ionomer -- From: tony2@bellcore.com (Antoni S. Gozdz)
Subject: Desperately needing information re: polymers -- From: TODD WEIMER
Subject: Desperately needing information re: polymers -- From: TODD WEIMER
Subject: Coilcoating? -- From: Bas de Vries

Articles

Subject: Re: Transparency films for laser printers
From: "Michael A. Jar"
Date: Mon, 11 Nov 1996 02:28:36 +0800
Fred Adler wrote:
> 
> I am hoping that someone can give me some insight into the chemical
> nature of the ordinary transparency films used in laser printers
> and/or photocopiers.
> 
(snip)
> Fred Adler
(snip)
As far as I know, "acetates" are actually made from PET (Mylar etc)
nowadays. I don't think they are coated. Shouldn't be too hard to find
out who extrudes them. 3M make a range of them.
Michael.
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Subject: Re: compression-after-impact-testing
From: jcolt@scsn.net (Rob&Jen;)
Date: 10 Nov 1996 22:35:28 GMT
In article <32860D7C.9E@winewall.demon.co.uk>, adrian@winewall.demon.co.uk 
says...
>
>This is a multi-part message in MIME format.
>
>--------------138F57E9594B
>Content-Type: text/plain; charset=us-ascii
>Content-Transfer-Encoding: 7bit
>
>-- 
>reply to ds3eng@bolton.ac.uk
>Davinder Sandhu
>
>--------------138F57E9594B
>Content-Type: text/plain; charset=iso-8859-1; name="cai.txt"
>Content-Transfer-Encoding: 8bit
>Content-Disposition: inline; filename="cai.txt"
>
>I am currently in the middle of a project to build an impact test rig to 
carry out 
>compression-after-impact tests on composite materials. I would like to hear 
from 
>anyone who has carried out similar tests so that I may compare my results 
with theirs. 
>Similarly if anyone knows of any web sites that have information on this 
area and in 
>particular the related failure theorems, I’d like to hear from you. I’ve 
found a few but 
>none that allow you to view their results.
>
>--------------138F57E9594B--
>
This is an interested question with a number of variables.  CAI will depend, 
of course, on the type of composites you have and what you're trying to learn 
from the testing.  (Damage tolerance vs. damage resistance, maybe GIIc)
There's also a big difference between fabric composites and unidirectional 
laminates.  I did some CAI tests on RTM laminates I made for my master's 
thesis.  These were conducted on 65mm square specimens impacted with a 
horizontal gas gun.  My purpose was to see the effects of resin or sizing on 
the fiber, using both carbon and glass fabrics.  After impact, the damage is 
measured by ultrasound (the accuracy of which is questionable) and a smaller 
compression specimen is cut from the whole,I think 25.4mm by 40mm, I'll have 
to check.
There are a few standards also out there for CAI.  Among these is a Boeing 
Standard and some dead weight drop tests.
Anyway, hope this'll help.  You might try to reach someone at Virginia Tech 
dept. of Engineering Science and Mechanics at http://www.vt.edu.
Hope thiss'll help.
Email if you want more info on the compression test.  I should have something 
lying around.
Rob Demaree
rdemaree@scsn.net
There
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Subject: Re: Polyurethane Foam
From: Brent Viers
Date: Sun, 10 Nov 1996 17:13:34 -0500
Polyurethane foams are mode by taking an isocyanate and reacrting it in
the presence of water. The isocayanate group reacts with water to form
an amine and carbon dioxide-which causes the bubbles which cause the
foaming. Eventually, other isocyanate groups will react with the amine
groups, which then trap in the faom structure. There are several
technical articles about the process (look up "polyurethanes" in the
Encyclopeida of Polymer Science and Engineering Ed. By Mark, Menges,
Overberger, et. al.) 
	However, most of the foams are made by the Bayer chemical company
(which makes the isocyantaes-water , of course, is free.) Look up their
Web Page for a possible tutorial.
Cynthia Donahey wrote:
> 
> How is polyurethane foam made?
> What materials are used?
> Is there any limit to size?
> Besides being an absorbent, what else can it be called? in order of
> importance.
> 
> I have been cutting out out old cushions and using them as planters with
> some real interesting and practical results.  One of the strangest things
> about these planters is the place where soil and the foam meet.  The soil
> seems to slide away from the foam.  So do plants, although they will climb
> over nicely.  I still don't know if roots will grow through this material.
> Some basics would be appreciated.
-- 
Brent D. Viers                 
Department of Chemistry         
Polymer Research Center         
Mail Location 0172              
University of Cincinnati        
Cincinnati, OH 45221-0172       
Telephones: 513-556-9291        
            513-556-9290        
Fax: 513-556-9239                
e-mail:viersbd@ucbeh.san.uc.edu
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Subject: Coupling agent for SiO2 in epoxy?
From: thomashawk@aol.com
Date: 11 Nov 1996 04:46:26 GMT
I am interested in information on coupling agents for silica loaded into
epoxies, such as Shell EPON 805 or 815.  Trade name, company and other
contact information would be greatly appreciated.
Tom
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Subject: World Premiere
From: jkoster
Date: Mon, 11 Nov 1996 09:42:49 -0800
!!  world premiere  !!
From november 11th, the Fructan Page proudly
presents the world's first virtual reality 
Fructans. Now you can see them in a 3D world
and actually walk toward them twist them around 
and just be amazed at what's possible these days.
I hereby invite everybody for a visit to the 
Fructan Page. You won't be sorry.
If you don't know what fructans are yet, there's
plenty of information on this subject at The 
Fructan Page.
The Fructan
Page
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Subject: Mystery Polymer (PNIPAM)
From: derekh@aloha.net (Derek Henderson)
Date: 11 Nov 1996 09:30:32 GMT
I am trying to locate poly(N-isopropylacrylamide) PNIPAM. This 
polymer is a thermo-sensitive polymer.
Does anyone know of a company selling this material. Any and all 
help would be greatly appreciated.
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Subject: Pipe coating with epoxies.
From: "Tony Warren"
Date: 11 Nov 1996 04:19:56 GMT
I would really like to get some commercial information on coating interior
and exterior surfaces of pipe.
Thanks,
Tony
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Subject: Re: Abrasion Resistance
From: Alec Ganopolsky
Date: Mon, 11 Nov 1996 08:08:36 -0800
Jerry P. Solomon wrote:
> 
> Can anyone suggest a reference for abrasion resistance of various
> plastic materials.  Initially, I am interested in UHMWPE, TFE, and
> other fluorocarbon compounds.
> 
> My address is:      JPSOLO@CCMAIL.MONSANTO.COM
> 
> Thanks in advance for any advice.
> 
> Jerry Solomon
> Monsanto Company
Please call Technicoat, Inc. at 201-568-3337.
Regards,
Alec Ganopolsky
Tecnnicoat, Inc.    http://www.finishing.com/technicoat
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Subject: Acryloids
From: Bas de Vries
Date: Mon, 11 Nov 1996 22:42:58 +0900
Anyone knows what acryloid's/Acrylic Ester Resins are?
What are they used for? Suppliers?
If you can't help me, maybe you have an suggestion for another
specialised newsgroup?
Thanks
Bas
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Subject: Re: Thermochromatic Effect
From: dsmall@pcisys.net
Date: Mon, 11 Nov 1996 18:11:05 -0600
X-Article-Creation-Date: Tue Nov 12 00:09:59 1996 GMT
X-Originating-IP-Addr: 207.76.102.135 ()
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Lines: 24
Xref: magma.Mines.EDU sci.polymers:8568 sci.chem:72393
In article <3276FD4A.3C51@greenepa.net> ,
    Wayne Goates  wrote:
> 
> I have a T-shirt that will change color from a more or less drab gray 
> color to that of a blue and a yellow when exposed to the UV light of the 
> sun.  Does anyone know what company markets this Thermochromatic product 
> and if so, what is their address?  Thanks in advance. 
> ----------
> Wayne Goates   Email:goat5200@spacelink.msfc.nasa.gov
> 
Wayne,
The T-shirt you're referring to is Photochromic (UV light sensitive)-- not 
Thermochromic (Heat sensitive).  My company, Chromatic Technologies, Inc.,
(www.lightlink.com/cti/) offers both these types of inks, as well as finished
products, like T-shirts and other promotional products.
If you would like further info., please call us at (719) 592-1557. 
- Danny 
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Subject: Re: Thermochromatic Effect
From: dsmall@pcisys.net
Date: Mon, 11 Nov 1996 18:11:05 -0600
X-Article-Creation-Date: Tue Nov 12 00:09:59 1996 GMT
X-Originating-IP-Addr: 207.76.102.135 ()
X-Authenticated-Sender: dsmall@pcisys.net
Lines: 24
Xref: magma.Mines.EDU sci.polymers:8568 sci.chem:72393
In article <3276FD4A.3C51@greenepa.net> ,
    Wayne Goates  wrote:
> 
> I have a T-shirt that will change color from a more or less drab gray 
> color to that of a blue and a yellow when exposed to the UV light of the 
> sun.  Does anyone know what company markets this Thermochromatic product 
> and if so, what is their address?  Thanks in advance. 
> ----------
> Wayne Goates   Email:goat5200@spacelink.msfc.nasa.gov
> 
Wayne,
The T-shirt you're referring to is Photochromic (UV light sensitive)-- not 
Thermochromic (Heat sensitive).  My company, Chromatic Technologies, Inc.,
(www.lightlink.com/cti/) offers both these types of inks, as well as finished
products, like T-shirts and other promotional products.
If you would like further info., please call us at (719) 592-1557. 
- Danny 
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Subject: JOB SEARCH [posted weekly]
From: "Amrish K. Lal"
Date: Mon, 11 Nov 1996 21:22:27 -0500




   Job Search for Chemical Engineers
   
   
   
   



Job Search for Chemical Engineers
http://home.earthlink.net/~amrish/chemical.html


Company Listings According to Industry Type:

Job Search Databases:

Salary Survey:

Some Other Resources:


Acknowledgments:


Where else can you find this page:

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This page is maintained by: Amrish K. Lal
Send me an e-mail: alal@mcs.kent.edu

visitors since Aug 1, 1996.

Last Updated: November 2, 1996


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Subject: Salt removal from styrene copolymers
From: Craig Spink
Date: Tue, 12 Nov 1996 02:34:04 GMT
I have been struggling with a project involving styrene-vinyltoluene
copolymers.  The polymer is made via emulsion polymerization with sodium
lauryl sulfate as an emulsifier.  The procedure I was given calls for 
coagulation with salt water to get a powder.  The powder must then
be washed with deionized water to wash out the sodium.  This washing
used a great deal of water and requires many cycles (at least 12) to get
the sodium content down to below 500 ppm.  
Any suggestions on improving this washing?  What swelling agents
can I use to improve the washing step?  I suspect the polymer
particles shrink and trap the salt inside the particle.
Thanks for your help!
alchemist@fyi.net
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Subject: Re: Electron Beam Curing
From: tony2@bellcore.com (Antoni S. Gozdz)
Date: 12 Nov 1996 03:21:18 GMT
In article <55dpuh$fti@newsbf02.news.aol.com> mioxirane@aol.com (Mioxirane) writes:
>I have just finished reading an article about electron beam curing of
>epoxy materials.The concept seems pretty simple.  Just pass a stream of
>high energy elecrtrons through your systme to cure your material.  
>
>The article says that for successful e-beam curing, the resin systems must
>be modified.  To become e-beam curable the systems should contain a
>cationic photo-initiator.  What materials would be cationic
>photo-initiators for this type of systme described??  This article
>appeared in the September/October issue of High-Performance Composites.
There are many options, but one simple (and very effective) example is
Ph3S(+)AsF6(-) (TPS AsF6; triphenylsulfonium hexafluoroarsenate) in 
conjunction with glycidylnovolaks. This class of salts generates a
superacid (HAsF6) upon exposure to actinic radiation (e-beam, x-ray,
deep UV) which then catalyzes cationic polymerization of the epoxide
moieties.
Tony Gozdz
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Subject: Re: phenol formaldehyde
From: tony2@bellcore.com (Antoni S. Gozdz)
Date: 12 Nov 1996 03:48:51 GMT
In article <55omaj$d0q@hermes.louisville.edu> skshah01@starbase.spd.louisville.edu writes:
>Just wondering if anyone might have some rate constants for phenol
>formaldehyde polymerization.
Well, there are so many options for this _condensation_ reaction, and
people have been studying it for the past 60 years...
Tony Gozdz
tony2@bellcore.com
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Subject: Re: Measuring fluorine treatment of polyethylene
From: tony2@bellcore.com (Antoni S. Gozdz)
Date: 12 Nov 1996 03:38:24 GMT
In article <327E0253.2991@starnetinc.com> heisel19@starnetinc.com writes:
>Polyethylene containers are surface treated with fluorine gas to improve
>their solvent barrier properties.  I am looking for a quantitative test
>to determine the extent of conversion of C-H bonds to C-F bonds.  FTIR
>may have some potential.  Any suggestions would be welcome.
Usually, XPS/Ar+ beam sputtering or SIMS are the methods of choice 
for such surface-composition studies. Then come ATR IR, contact-angle 
measurements, RBS...
Tony Gozdz
tony2@bellcore.com
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Subject: Re: Need Good Cold Bonding Adhesives for Silicone
From: tony2@bellcore.com (Antoni S. Gozdz)
Date: 12 Nov 1996 03:45:33 GMT
In article   writes:
>
>Brian,
>We are currently applying for a patent to cover silicone bonding and
>coatings on polyester materials, and a smililar process should work well
>on PBT.
[...]
Various silicone-coated PET films are also commercially available from 
many distributors. DuPont, amongst others, makes several grades.
Tony Gozdz
tony2@bellcore.com
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Subject: Re: Looking for info on PE Ionomer
From: tony2@bellcore.com (Antoni S. Gozdz)
Date: 12 Nov 1996 03:32:35 GMT
In article <327D6E87.F73@cris.com> Ralph &/or Donna  writes:
>Michael Thompson wrote:
>> 
>>   I am writing a term paper on ionomers in general and PE ionomer and its
>> properties/processing specifically.  Unfortunately, there does not seem to
>> be much printed material about ionomers.  Any direction is greatly
>> appreciated (e-mail contacts, web pages, databases etc)
>> 
>> Thanks in advance.
>
>Primacor(r) resins are commercially available ethylene/acrylic acid 
>resins from the Dow Chemical Company.
>
>czere@dow.com
>
or the well-known Surlyn(tm) from DuPont. 
BTW, the original poster's claim about the dearth of printed material on
ionomers cannot be taken too seriously... A quick search of several
publicly accessible patent databases (e.g., http://www.qpat.com) will
show why. I don't even venture to guess how many thousands of entries would
be found in Chemical Abstracts (unfortunately, not a freebe).
Tony Gozdz
tony2@bellcore.com
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Subject: Desperately needing information re: polymers
From: TODD WEIMER
Date: 12 Nov 1996 05:55:43 GMT
To whom it may concern:
I have some questions regarding polymers  and I am uncertain how to source an answer.  If my questions enter into your field of expertise, and you can be of some assistance, please respond to my e-mail (any assistance or referrals you can be provided would be incredibly beneficial).
The company I own manufactures golf course yardage markers out of recycled tires.  It has been fairly successful but over this last summer some weaknesses with our products have surfaced and we are having problems addressing the problem.
The markers we make are 15" hectagons,  approx. 2" thick.  The major problem we have experienced is with golfers kicking them as a result of "golfing frustrations".  The recycled tire component "crumbles" under consistent impact.  We have been attempting to rectify the situation by covering the recycled tire component with a material of a similar flexibility but more resistant to abuse.  
The application we have attempted is a two part polyurethane poured (transfer molded ?) into a mold the same size as our yardage marker.  We then pull the polyurethane part out of the mould (or tool) and glue it onto the yardage marker.  The moulded polyurethane is useful in that we can incorporate golf course logos onto our product whereas before it was difficult to do with our recycled tire component.
We are finding the polyurethane to be too expensive, but because we use it as our bonding agent for the recycled tires, we are somewhat familiar with it and were able to source it out.  
Through my research (to date) I have found that a polymer such as PVC or EPDM may work well in our application but I am uncertain if another polymer can be applied in the moulded application I have described.   
Briefly, here are questions I am looking to have answered:
1.  	Is there other polymers than can be poured into molds such as the ones I have described?
	(transfer moulded)
2.  	Would a suitable polymer be UV stable and retain our common colours of red, white, 	yellow,  blue and black over an extended period of time? 
3. 	Would a suitable polymer be resistant enough to withstand golf-cleat traffic?
4. 	Would a suitable polymer be cheap enough to incorporate into our product? (cheaper 	than an aromatic polyurethane)
5. 	Would a suitable polymer be effected in anyway by golf course chemicals? (fertilizers, 	pesticides etc.)
6. 	Would a suitable polymer be flexible or have a hardness of  70A - 90A?
As you may have guessed, I am not a chemist nor do I have any knowledge of polymers.  I am in desperate need of assistance and finding that up here in Canada there are very few people able to offer me any useful information.
As mentioned, if you can provide me with any information, it would be greatly appreciated.
Hoping to here from you soon,
Todd Weimer
P.S.  Because my company deals with recycled products, we like to keep the recycled content as high as possible.  A best case scenario for a polymer would be one that could use, I have been informed, "thermoset polymers" as inert fillers.  Its "GreeK" to me but I understand it as adding a recycled polymer component to virgin polymer (am I correct in this and is it possible?).
Return to Top
Subject: Desperately needing information re: polymers
From: TODD WEIMER
Date: 12 Nov 1996 05:55:51 GMT
To whom it may concern:
I have some questions regarding polymers  and I am uncertain how to source an answer.  If my questions enter into your field of expertise, and you can be of some assistance, please respond to my e-mail (any assistance or referrals you can be provided would be incredibly beneficial).
The company I own manufactures golf course yardage markers out of recycled tires.  It has been fairly successful but over this last summer some weaknesses with our products have surfaced and we are having problems addressing the problem.
The markers we make are 15" hectagons,  approx. 2" thick.  The major problem we have experienced is with golfers kicking them as a result of "golfing frustrations".  The recycled tire component "crumbles" under consistent impact.  We have been attempting to rectify the situation by covering the recycled tire component with a material of a similar flexibility but more resistant to abuse.  
The application we have attempted is a two part polyurethane poured (transfer molded ?) into a mold the same size as our yardage marker.  We then pull the polyurethane part out of the mould (or tool) and glue it onto the yardage marker.  The moulded polyurethane is useful in that we can incorporate golf course logos onto our product whereas before it was difficult to do with our recycled tire component.
We are finding the polyurethane to be too expensive, but because we use it as our bonding agent for the recycled tires, we are somewhat familiar with it and were able to source it out.  
Through my research (to date) I have found that a polymer such as PVC or EPDM may work well in our application but I am uncertain if another polymer can be applied in the moulded application I have described.   
Briefly, here are questions I am looking to have answered:
1.  	Is there other polymers than can be poured into molds such as the ones I have described?
	(transfer moulded)
2.  	Would a suitable polymer be UV stable and retain our common colours of red, white, 	yellow,  blue and black over an extended period of time? 
3. 	Would a suitable polymer be resistant enough to withstand golf-cleat traffic?
4. 	Would a suitable polymer be cheap enough to incorporate into our product? (cheaper 	than an aromatic polyurethane)
5. 	Would a suitable polymer be effected in anyway by golf course chemicals? (fertilizers, 	pesticides etc.)
6. 	Would a suitable polymer be flexible or have a hardness of  70A - 90A?
As you may have guessed, I am not a chemist nor do I have any knowledge of polymers.  I am in desperate need of assistance and finding that up here in Canada there are very few people able to offer me any useful information.
As mentioned, if you can provide me with any information, it would be greatly appreciated.
Hoping to here from you soon,
Todd Weimer
P.S.  Because my company deals with recycled products, we like to keep the recycled content as high as possible.  A best case scenario for a polymer would be one that could use, I have been informed, "thermoset polymers" as inert fillers.  Its "GreeK" to me but I understand it as adding a recycled polymer component to virgin polymer (am I correct in this and is it possible?).
Return to Top
Subject: Coilcoating?
From: Bas de Vries
Date: Tue, 12 Nov 1996 17:14:15 +0900
I am looking for information on what I call coilcoating, but in fact I
have no idea whether that is the proper word.
What I mean is the lamination of sheet metall with a film. This film is
as far as I know a laminate, PET/adh./s-PVC laminate. The laminate is
bonded to the metall using a solvent based PU adhesive.
Does anybody no more? More detail on the adhesive, how is the adhesive
applied, both adhesives applied at the same time, does anybody know
other laminate constructions for this application, is the bonding of
s-PVC without problems, what is the plasticiser in s-PVC, how is the
film caoted on the metall etc.etc. All info is very much appreciated.
Bas
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