Commercial silicon resin was devolatilized by vacuum distillation, cured at room temperature and tested favorably for outgassing criteria. Applications of the devolatilized resin are potting compounds and conformal coatings

Clatterbuck, C.

Park, J.

Seidenberg, B.

English

NASA Technical Reports Server

June 1972	 B72-10280 
NASA TECH BRIEF 
Goddard Space Flight Center 
NASA Tech Briefs announce now technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Devolatilization of Polymer Resins 
Notes: 
1. 
2. 
is
The problem: 
Under conditions of high temperature and low pres-
sure, certain substances containing polymer resins emit 
volatile materials, making them unsuitable for space 
flight use. 
The solution: 
A commercial silicon resin was devolatilized by 
vacuum distillation at 150°C for 24 hours at 1 x 10-6 
Torr. The resultant product passed the test for out- 	 3. 
gassing criteria (acceptably low percentage of volatile 
materials), and it is cured at room-temperature. 
A white paint with acceptable physical properties 
was made using the devolatilized resin. 
How it's done:
The GSFC Micro-VCM Test consists of subjecting a 
material to 125°C at 1 x 10-6 Torr for 24 hours with 
the condensate being collected at 25°C in the same 
system. The criteria for passing the test are a maxi-
mum 1% weight loss and a maximum 0.1% of volatile 
condensable materials. 
Suggested applications of the devolatilized resin are 
potting compounds and conformal coatings. 
Requests for further information may be obtained 
from:
Technology Utilization Officer 
Goddard Space Flight Center 
Code 207.1 
Greenbelt, Maryland 20771 
Reference: B72-10280 
The silicon binder, a linear polydimethylsiloxane, 
was heated at 150°C for 24 hours in a starting vacuum 
of 1 x 10-6 Torr. The resin height was one-half inch 
(1.25 cm). 
In this particular application, a white paint (P-764-1 A) 
was prepared using 240 parts by weight ZnO mortared 
with 100 parts devolatilized resin, then mechanically 
stirred with 200 parts reagent grade toluene and one part 
SRC-05 catalyst. 
A representative sample of cured paint passed the 
GSFC Micro-VCM (Volatile Condensable Materials) test. 
The paint adhered well to primed aluminum and epoxy 
fiberglass surfaces, both before and after thermal cycling.
Patent status: 
This invention is owned by NASA, and a patent 
application has been filed. Royalty-free, non-exclusive 
license for its commercial use will be granted by NASA. 
Inquiries concerning license rights should be made to: 
Patent Counsel 
Goddard Space Flight Center 
Code 204 
Greenbelt, Maryland 20771 
Source: Benjamin Seidenberg, J. Park and 
C. Clatterbuck
Goddard Space Flight Center
(GSC-1 1358) 
Category 04 
This documentwas prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19720000279 2020-03-17T03:28:49+00:00Z


Devolatilization of polymer resins

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