Newsgroup sci.polymers 8579

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Dr. R.D. Kane wrote:
> 
> InterCorr/96 - The First Global Internet Corrosion Conference. This is
> the first corrosion conference where technical papers are
> presented, published and archived on the Internet. InterCorr/96 is
> pleased to announce the posting of the first technical society session
> sponsored by ASTM entitled, "Corrosion Tests and Standards: Application
> and Interpretation".
> 
> These papers will be posted over the period June through February, 1997.
> This innovative format provides for unlimited global access of the
> papers from the InterCorr/96 Web Site:
> 
> http://www.clihouston.com
> 
> There have been over 730 registrants from over 30 countries worldwide.
> Registration is complimentary provided by the corporate sponsors
> participating in the first Internet Virtual Tradeshow also found on the
> InterCorr/96 Web Site.
> 
> Dr. R.D. Kane
> 
> --
> CLI International, Inc.
> The Materials & Corrosion Specialists
> http://www.clihouston.com
> 
> CLI's New Specialty Equipment Division offers
> Equipment backed by service and experience.
Bit pretentious postic with a title, we can all do it mate, but some of
us aren't peacocks, we are REAL engineers.
later
JB

Try cross posting to sci.polymers.  Also, two large
makers of polystyrene are Dow and Huntsman.  Call their
customer service departments and ask for R&D.;
Huntsman's phone number is 1-800-221-1788.  You'll have
to call information to find a number for Dow.
Steve Turner wrote:
> 
> I am trying to spin-cast polystyrene onto a glass or metallic mold
> to make thin films with small-scale structure.  I am having
> a problem with the PS cracking when I remove the film from
> the mold.  Does anyone know of a plasticizer I can use with
> PS, or a mold release agent that will work with metal or glass?
> 
> I am currently using trichloroethylene as a solvent for the
> casting.
> 
> I am not dead set on polystyrene, but right now it is the only one I
> have had any success with.  Polyethylene would probably be a
> more suitable material, but I have not been able to find a
> suitable solvent for spin-casting.  It seems that nothing will
> dissolve it below about 70C, and I don't have a heated spinner.
> Also, I am told that HDPE will not be 100% conformal to the mold
> when the solvent is baked out.
> 
> I have thought of chemical vapor deposition techniques
> and plasma deposition, but I don't know anything about
> these.
> 
> Any advice would be much appreciated.
> 
> Steve Turner
> Department of Physics
> Cornell University
-- 
James Coffey, P.E.
Chemical Engineer
JNCOFFEY@WORLDNET.ATT.NET (alternate address)
========================
The views expressed above are my own, and have no 
connection to my employer.

Can anyone help me identify the membrane that keeps the gel/oil in the
galde plug-in but allows the fragrance to be passed thru when heated
(pluged in).
Thanks,
Jeff

In article <32861ED4.7C40@pc.jaring.my>
           majar@pc.jaring.my "Michael A. Jar" writes:
> 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.
> 
> 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.
Several makers, and depending on how the film is to be used the PET
film is usually treated to improve ink takeup either by plasma etch 
or with a slightly porous acrylic coating.
Regards,
-- 
Martin Brown       __                CIS: 71651,470
Scientific Software Consultancy             /^,,)__/

Water is free-any other responses obviously have a cost involved. My
suggestion would be to flush the whole mix through some kind of
preperative chromatography column (you can build one yourself-as almost
all organic chemists do- with silica gel in a big glass tube). You'll
have to use an organic solvent to dissolve the PS-but the NA ions should
preferentially adsorb to the OH sites in the silica. Repreciptitate you
PS into water or methanol (which should again get rid of any remaining
NA ions) and you're good to go-no muss, no fuss.
Craig Spink wrote:
> 
> 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
-- 
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

Buyer agent wanted(semiconductor,wafer,ingots....)
We need a buyer agent in Ukraine or Russia If anyone interesting
pls contact with Michael shei (live in Kiev or mocow is best)
regards
Michael

Just call the company "Union Carbide" and ask for Cyracure products. 
They  can tell you everything about cationic radiation curing systems. 
Instead of using electron beams it is possible and in many cases 
cheaper to cure with UV light.
Alex

 Respirometer monitors bioremediation rate of polymers.
2.4 kW UV lamp system available for testing polymer oxidation ( O2
consumption, CO2 ,CO production)  during UV exposure.
New  O2/CO2/CH4/H2S Respirometer is intended for monitoring gas exchanges 
 during polymer oxydation or degradation by  aerobic or anaerobic
bacterial  activity.  It can also be used for monitoring respiration of
algae, plants and insects. Up to 80 sample chambers can be connected to
Respirometer which is equipped with  O2, CO2,CH4 and H2S Analyzers.
Optional H2 sensor is also available.Sample chambers can be refreshed by
ambient air or from the compress gas bottles or from the  programmable gas
blender. Respirometer is capable to measure head space gas exchanges (
oxygen consumption , CO2/CH4,H2S  production etc) on 24h basis. Multiple
experiments of different length can be conducted in the same time using
liquid  or solid samples. Due to the exceptionally high sensitivity
0.2uLof gas/h,  Respirometer can monitor very slow anaerobic
biodegradation processes but optional open flow arrangement providing air
supply to the reactors can be used to measure gas exchanges during
composting or fermentation processes.
If you need more information ( application papers) please e-mail your
street address to:
Jan  Czekajewski Ph.D.
janczek@aol.com
 or call : (614)276-0861

Can someone tell me the adhesion mechanism of cyanoacrylate glues?  I
believe they are initially a mixture of monomer and oligimers, and I know
they are set off by water.    Also, it has been my experience that,
although initially soluble in solvents like acetone, after they are glued,
they are insoluble.  Are they cross-linked?  How?

A micro combination pH electrode is now available which can measure 
samples as small as 20 microliters which is a fraction of a single drop 
of liquid. The electrode fits into 96 well plates, microcentrifuge tubes, 
serum cups, capillary tubes, and NMR tubes.  The probe is all solid state 
with a Teflon body making itvirtually unbreakable.  It has a 1mm tip and 
2 mm body and can be used with any standard pH meter.   For further 
details contact Lazar Research Labs. Inc.  at service@lazarlab.com or see 
the Lazar web site at http://www.lazarlab.com or fax 1-213-931-1434.

Mr. Viers,
I believe you have described the production of a polyurea.  
A polyurethane would be produced if you added a difunctional 
alcohol to your descriptioin.
Craig Garrison
The Dow Chemical Company
In article 
<3286538E.41C6@jemcom.crs.uc.edu> Brent Viers  
writes:>Path:>news.mastnet.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.s
tealth.net!news>.idt.net!news.ececs.uc.edu!root
>From: Brent Viers 
>Newsgroups: sci.polymers
>Subject: Re: Polyurethane Foam
>Date: Sun, 10 Nov 1996 17:13:34 -0500
>Organization: ECE/CS News Server
>Lines: 39
>Message-ID: <3286538E.41C6@jemcom.crs.uc.edu>
>References: <563o0k$koa@login.freenet.columbus.oh.us>
>NNTP-Posting-Host: jemcom.crs.uc.edu
>Mime-Version: 1.0
>Content-Type: text/plain; charset=us-ascii
>Content-Transfer-Encoding: 7bit
>X-Mailer: Mozilla 3.0 (X11; I; IRIX64 6.1 IP26)
>To: Cynthia Donahey 
>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

	I'm doing the research on teh micro-structure of acrylic polymer.
	I would like to know how to obtain PMMA-EA (poly-methyl-methacrylate
 ethyl-acrylate) copolymer prepared  by anionic copolymerization.
		thank you very much.
	Please answer me, at the following e-mail :
	giao.nguyen@lesoc.u-nancy.fr

In <55omaj$d0q@hermes.louisville.edu>, skshah01@starbase.spd.louisville.edu writes:
>Just wondering if anyone might have some rate constants for phenol
>formaldehyde polymerization.
>
There are three older studies from the fifties and sixties. The results have been
collected and discussed in:
A. Knop, L.A. Pilato
Phenolic Resins; Chemistry, Applications and Performance
Springer-Verlag
Berlin Heidelberg New York Tokyo
1985
Klaus Oldoerp

haans@endura.com (Haans Petruschke) wrote:
>>From: maxnrax@ix.netcom.com(Martin Goldsberry)
>>Newsgroups: sci.polymers
>>Subject: residual stress in polycarbonate
>>Date: 7 Nov 1996 01:57:01 GMT
>>Organization: Netcom
>
>>Does anyone know where I may find stress values at the surface of voids
>>and sinks of injection molded polycarbonate?  Thank you.
>
>>Martin
>
>This is not easily done.  GE Plastics has a method where they immerse the
>part is increasingly higher concentrations of a solvent for a predetermined
>time.  Based upon what concentration attack begins to appear the residual
>stress can be estimated based upon a chart from previous research.  This is
>not a highly accurate method but seems to be the best there is.  Contact GE
>Plastics at 800 845 0600 for further information. 
The original post isn't clear enough for me to rule this out: could 
birefringence measurements work?
John

Michael Bardash  wrote:
>Can polyaniline be used to make reasonable quality thin conducting (or
>maybe semiconducting) films?  It seems that the polymer is available as
>a salt, and isn't soluble.  What processing is necessary to make films. 
>Are there better polymers to try? If you have the answer to these or
>other exciting questions, you can either post them here, or e-mail them
>to me at qel@mail.idt.net.  Thanks in advance.
>
Monsanto makes an experimental material, XICP-OS01 that is polyaniline 
disperesed in xylene. I don't know if it will make a film upon drying. 
Contact Gary Rawlings at 314.694.2925
Otherwise Bayer makes an aquesous solution of polyethylene 
dioxythiophene/polystyrene sulfonate (PEDT/PSS) called AI 4071. It's 
available from the Inorganics Business Group and will make a conductive 
film upon drying.
John

AlexLott@t-online.de (Alexandra Lott) wrote:
>Just call the company "Union Carbide" and ask for Cyracure products. 
>They  can tell you everything about cationic radiation curing systems. 
>Instead of using electron beams it is possible and in many cases 
>cheaper to cure with UV light.
>
Everything you stated is true, however, I would caution that uring with 
UV can have additional difficulties. If the material is thick, it is very 
easy for a cure gradient to develop (the material on top is cured better 
than the material at the bottom). In addition, UV curing can be a slower 
step than E-beam. While I am appearing to be critical of UV, I am just 
trying to present a balanced viewpoint. I would personally go or UV as a 
first effort.
John