Absorption coeffcients for polymers
Greg Salomons
Thu, 19 Jun 1997 13:27:33 -0400
Hi, I am looking for optical absorption coeffcients for Polystyrene
and PolyButadyene. Does anyone know where I could find such information?
Ps. I need to know the values for visible light near room temperature.
\,|,/
~(o o)~
/===================oOO--(_)--OOo===========================================\
Greg Salomons | Email: smokey@eeyore.phy.queensu.ca
Dept. of Physics | Phone: (613) 545-6000 ext. 7375
Queen's University | Fax: (613) 545-6463
Kingston, Ont. Canada, | Disclaimer: I accept no responsibility for the
K7L-3N6 | fact that my employer may not share my opinions.
\===========================================================================/
|/ \|
(_) (_)
New Informations about Organic Metals (Conductive Polymers), Polyaniline
wessling@zipperling.do.eunet.de
Sat, 21 Jun 1997 03:51:18 -0600
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ORMECON CHEMIE GmbH & Co., KG a subsidiary of Zipperling
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email
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Tel
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Fax
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web site
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Re: What are IC packages made of?
brown209@tc.umn.edu (Jason R. Brown)
Sat, 21 Jun 1997 21:03:38 -0600
In article <33A8D7A0.1AAD@worldnet.att.net>, screen.bobsun@worldnet.att.net
wrote:
>
> It will only work if you use a ceramic package (usually purple). The
> black packages are epoxy, highly filled with silica. They absorb large
> amounts of water, and also have low molecular organic components in them
> (i.e., wax). There are several different types used, but all ae pretty
> much the same. My guess is that they would out-gas forever :^(
>
> bobsun
Mmmm... that might not be true. I'm not real familiar with the encapsulant
material used for most IC's, but I believe them to be a Novolac of some
sort. And depending on the moisture or solvent content, you may well be
able to put it in a UHV environment. I say this since the organic packages
we make at Johnson Matthey are routinely put into our Auger chamber. They
do outgas quite a bit, but if left overnight we can usually pull something
in the neighborhood of 1E-9 Torr, or even better if you sublimate some
titanium in the chamber while pumping down.
--
Jason R. Brown | A very popular error: having the courage of
Johnson Matthey Electronics | one's convictions; rather it is a matter of
brown209@tc.umn.edu | having the courage for an attack on one's
http://umn.edu/~brown209 | convictions!!!
| -Nietzsche
Re: What are IC packages made of?
screen.bobsun@worldnet.att.net
Mon, 23 Jun 1997 00:03:59 -0700
Jason R. Brown wrote:
>
> In article <33A8D7A0.1AAD@worldnet.att.net>, screen.bobsun@worldnet.att.net
> wrote:
>
> >
> > It will only work if you use a ceramic package (usually purple). The
> > black packages are epoxy, highly filled with silica. They absorb large
> > amounts of water, and also have low molecular organic components in them
> > (i.e., wax). There are several different types used, but all ae pretty
> > much the same. My guess is that they would out-gas forever :^(
> >
> > bobsun
>
> Mmmm... that might not be true. I'm not real familiar with the encapsulant
> material used for most IC's, but I believe them to be a Novolac of some
> sort.
Yes. Novolacs are a type of epoxy
> And depending on the moisture or solvent content, you may well be
> able to put it in a UHV environment.
Typical epoxy formulations have no solvents present. However, they do
tend to absorb moisture from the environment. This could be driven out
through a long term bake.
> I say this since the organic packages
> we make at Johnson Matthey are routinely put into our Auger chamber. They
> do outgas quite a bit, but if left overnight we can usually pull something
> in the neighborhood of 1E-9 Torr, or even better if you sublimate some
> titanium in the chamber while pumping down.
A reasonable existance proof that it might be possible - atleast on an
experimental basis. However, I would not recommend incorporating an
epoxy package into the UHV system, no more than i would recommend using
epoxy for any other part of the system.
>
> --
> Jason R. Brown | A very popular error: having the courage of
> Johnson Matthey Electronics | one's convictions; rather it is a matter of
> brown209@tc.umn.edu | having the courage for an attack on one's
>
> http://umn.edu/~brown209 | convictions!!!
> | -Nietzsche
Web-ROM
Aaron
23 Jun 1997 08:10:18 GMT
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UV Protective Coating for PVC
Christopher Brown
Tue, 24 Jun 1997 03:43:35 GMT
Assistance Requested...
I am seeking information (primarily for my own enlightenment) regarding UV protective top
coatings for PVC. My interest is with heavyweight reinforced PVC stock used by sign makers for
creating fexible outdoor banners and semi-rigid signage. More and more, this industry is turning
to digital printing techniques (inkjet for the most part) to create images on either self
adhesive 2 to 4 mil calendered PVC film and/or reinforced PVC stock of 10 to 18 ounces weight.
Application of clear over-laminates (4 to 5 mil pressure-sensitive and heat-activated clear PVC
film) is not uncommon, but brush-on UV protective top-coatings would be preferred. Unfortunately,
affordable, environmentally-friendly, quality coatings with good UV absorption, long-term (3 to 4
years) stability, and good flexibility seem rare. Of course, inkjet generated images tend to be
delicate, which prevents use of many of the solvent-based UV top-coatings apparently common to
screen printing. Is there anyone out there with a background in UV coatings interested in
providing a bit of technical information? I'm interested both in finding some commercial coating
options, as well as learning more about the specifics of coating technology. I would appreciate
any assistance.
Sincerely,
Chris Brown
renegade@ix.netcom.com
Job Opening - E Ink Corporation - Cambridge, MA
Russ Wilcox
Mon, 23 Jun 1997 21:53:19 -0400
Outstanding chemists with experience in microencapsulation,
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