Aromatic/heterocyclic polymers /Pyrrones/ have the ability to absorb large quantities of photolytic, thermal and radiolytic energies while retaining their useful properties. They are prepared from the room temperature reaction of tetraamines and tetraacids

Bell, V. L., Jr.

English

NASA Technical Reports Server

February 1966
	 Brief 66-10043 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. TiiIiTii -
Polymer Film Exhibits Thermal and Radiation Stability 
The problem: 
In the pursuit of aerospace programs there is a 
growing need for polymeric materials having the 
ability to absorb large quantities of photolytic, thermal, 
and radiolytic energies while retaining their useful 
properties. Dielectrics within a capacitor in a field of 
ionizing radiation, for example, are of significant 
concern because of the possibility of radiatiOn-in-
duced charging or partial charging that would seri-
ously interfere with design performance. Polymers with 
the above characteristics could appreciably advance 
the art in many terrestrial applications. 
The solution: 
A new class of aromatic/heterocyclic polymers 
(called Pyrrones) prepared from the room temperature 
reaction of tetraamines with tetraacids. Chemically 
and physically they combine many of the desirable 
properties of the aromatic polyimides and polyben-
zimidazoles. 
How it's done: 
A solution of 4.36g. (0.020 mole) of sublimed pyro-
mellitic dianhydride in 42 ml. of dimethylformamide 
(DMF) is added to a rapidly-stirred solution of 4.60 g. 
(0.020 mole) of 3,3',4,4'-tetraaminodiphenyl ether in 
35 ml. of DMF. The resulting viscous solution is cast 
onto glass plates and the solvent is evaporated at 
85°C for one hour, leaving a self-supporting film that 
is then heated for one hour at 200 to 250 0 C. The heat
treatment leaves a deep red, self-supporting, flexible 
film that is highly resistant to heat. 
Notes: 
1. While potential applications of the Pyrrones are 
relatively unexplored, they hold much promise as 
high temperature films, coatings, adhesives, resins 
for laminates, and in filament winding. 
2. Moldings of the Pyrrones are adaptable to easy 
filling with conventional reinforcing materials and 
exhibit very hard surfaces with a high degree of 
machinability. 
3. The full characterization of this new class of poly-
mers is far from complete and intensive research 
is continuing toward better understanding. 
4. Inquiries concerning this invention . may be di-
rected to: 
Technology Utilization Officer 
Langley Research Center 
Langley Station 
Hampton, Virginia, 23365 
Reference: B66-10043 
Patent status: 
Inquiries about obtaining rights for the commer-
cial use of this invention may be made to NASA, 
Code AGP, Washington, D.C., 20546. 
Source: Vernon L. Bell, Jr. 
(LRC-100) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000043 2020-03-11T17:33:40+00:00Z


Polymer film exhibits thermal and radiation stability

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