Modification of bismaleimide resin by poly(propylene phthalate), poly(butylene phthalate) and related (co)polyesters

✍ Scribed by Iijima, Takao; Ohnishi, Kohji; Fukuda, Wakichi; Tomoi, Masao

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 531 KB
• Volume: 45
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199804)45:4<403::aid-pi980>3.0.co;2-1

✦ Synopsis

Aromatic polyesters were prepared and used to decrease the brittleness of the bismaleimide resin composed of 4,4@-bismaleimidediphenyl methane (BMI) and o,o@-diallyl bisphenol A (DBA) (Matrimid 5292 resin). The aromatic polyesters included poly(propylene phthalate) (PPP), poly(2,2-dimethylpropylene phthalate) (PDPP), poly(butylene phthalate) (PBP) and poly(butylene phthalateco-butylene terephthalate) (50 mol% terephthalate unit) (PBPT). The polyesters were e †ective modiÐers for decreasing the brittleness of the bismaleimide resin. For example, inclusion of 20 wt% PPP (MW 18 700) led to 50% increase in the fracture toughness with retention of Ñexural properties and a slight loss of (K IC ) the glass transition temperature, compared with the mechanical and thermal properties of the unmodiÐed cured bismaleimide resin. Micro-structures of the modiÐed resins were examined by scanning electron microscopy and dynamic viscoelastic analysis. The thermal stability of the modiÐed resins was slightly lower than that of the unmodiÐed resin as determined by thermogravimetric analysis. The toughening mechanism is discussed in terms of the morphological and dynamic viscoelastic behaviour of the modiÐed bismaleimide resin system.

1998 SCI.