Tough, processable simultaneous semi-interpenetrating polyimides

Details Tough, processable simultaneous semi-interpenetrating polyimides Tough, processable simultaneous semi-interpenetrating polyimides

1994-04-04

1996-02-20

Carrillo, Ana L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525432, 525436, 525903, C08J 508, C08G 7300, C08L 7908

Patent

active

054929792

ABSTRACT:
A high temperature semi-interpenetrating polymer network (semi-IPN) was developed which had significantly improved processability, damage tolerance and mechanical performance, when compared to the commercial Thermid.RTM. materials. This simultaneous semi-IPN was prepared by mixing a thermosetting polyimide with a thermoplastic monomer precursor solution (NR-15082) and allowing them to react upon heating. This reaction occurs at a rate which decreases the flow and broadens the processing window. Upon heating at a higher temperature, there is an increase in flow. Because of the improved flow properties, broadened processing window and enhanced toughness, high strength polymer matrix composites, adhesives and molded articles can now be prepared from the acetylene endcapped polyimides which were previously inherently brittle and difficult to process.

REFERENCES:
patent: 4996101 (1991-02-01), Landis et al.
patent: 5159029 (1992-10-01), Pater et al.

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