间乙炔基苯基马来酰亚胺改性炔丙基酚醛树脂

Study on propargyl-functional novolak resin modified by m-(3-acetylenephenyl)maleimide

以不同质量比的间乙炔基苯基马来酰亚胺单体（3-APMI）和炔丙基酚醛树脂（PN）进行共聚制备了一系列间乙炔基苯基马来酰亚胺改性的炔丙基酚醛树脂（APMI-PN），希望通过引入马来酰亚胺链段赋予PN树脂更高的固化反应活性和耐热性。通过DSC、TGA、DMA、FT-IR、凝胶时间、流变分析、力学性能等测试手段对所合成的树脂及其浇注体的性能进行了研究。与PN树脂相比，APMI—PN树脂体系的固化反应活性大大提高，170℃下的凝胶时间可由140min缩短为31．6min或更短。固化物耐热性明显提高，玻璃化转变温度为385～474℃，起始热分解温度约为418～445℃。m（PN）：m（APMI）=1：1时，改性树脂（APMI-PN-1—1）复合材料的室温及400℃下弯曲强度比3-APMI体系分别提高了66％，15％，400℃层间剪切强度提高了23％，这是一种综合性能优良的耐高温复合材料基体树脂。

A serial of propargyl - functional novolak resins （PN）modified with m - （3 - acetylenephenyl）maleimide monomer （3 - APMI） were prepared by copolymeriztion between 3 - APMI monomer and PN resin at different weight ratins to improve curing reactivity and heat - resistant of PN by introdued maleimide chain segment. The properties of synthesized resin and casting were studied by DSC, TGA, DMA, FT - IR and of gel time , mechanical property test and rheological analysis. Comparing with PN resin, APMI - PN resins possessed good reactivity and heat - resistant properties.The gel time at 170 ℃ was shortened from 140 min to 31.6 min or less. The glass transition temperatures and initial thermal degradation temperatures were about 385 - 474 ℃ and 418 - 445 ℃, respectively. When m （PN） ： m （APMI） = 1：1, the flexural strength of modified resin（APMI- PN- 1 - 1 ）composite at room temperature and 400 ℃ was increased 66% and 15% respectively and intedaminar shear strength was increased 23% at 400 ℃ .APMI - PN - 1 - 1 showed excellent comprehensive properties, indicating that it should be an ideal candidate for matrix of high temperature - resistant composites.