Study on modified phenolic resin. II. Modification with p-hydroxyphenylmaleimide/styrene copolymer

✍ Scribed by A. Matsumoto; K. Hasegawa; A. Fukuda; K. Otsuki

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 562 KB
• Volume: 44
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1992.070440203

✦ Synopsis

The improvement of heat resistance and mechanical properties of phenolic resin was examined with the blend of novolac and copolymers prepared from p -hydroxyphenylmaleimide (HPMI) and styrene.

Copolymers of HPMI and styrene with various molecular weights were synthesized.

Glass transition ( T,) and thermal decomposition temperatures of the copolymers were measured by differential scanning calorimetry (DSC ) and thermogravimetry ( T G ) , respectively. The miscibility of the copolymers with novolac was examined by DSC.

It was found that the copolymers had a good heat resistance and a good miscibility with novolac. Molding compounds were prepared by hot roll-kneading of mixtures that involved novolac, copolymer, hexamethylenetetramine ( hexamine ) , and glass fiber. It was found that the test pieces prepared by transfer molding from the molding compounds showed a good heat resistance and better mechanical properties than phenolic resin modified with HPMI homopolymer.