高耐热线性环氧树脂的合成及流变特性研究

Synthesis and rheological properties of high heat resistant linear epoxy resin

通过N-苯基马来酰亚胺(N-PMI)与4,4′-二氨基二苯甲烷(DDM)迈克尔加成反应合成了一种改性二元胺(PDP),并与双酚A型环氧树脂(EP)反应制备了线性环氧树脂。通过核磁共振氢谱(HNMR)、红外光谱法(FTIR)和差式扫描量热法(DSC)研究了PDP的化学结构与性质,并通过DSC,FTIR和凝胶渗透色谱法(GPC)研究了线性环氧树脂耐热性(T_(g))及流变特性。结果表明:随着反应时间延长,EP/PDP(1∶1摩尔比)树脂体系黏度由0.55 Pa·s增至57 Pa·s,T_(g)由55℃升至120℃,平均分子质量由4651增至25096;随着温度的降低,体系黏度由200℃的0.55 Pa·s增加至140℃的60 Pa·s。不同比例EP/PDP树脂体系的T_(g)随PDP过量的比例增大而升高,当EP∶PDP为0.8∶1时,T_(g)为121℃,在相同反应时间,体系黏度随PDP过量比例的增大而增大。

A modified binary amine(PDP)was synthesized by the Michael addition reaction of N-phenylmale-imide(N-PMI)with 4,4′-diaminodiphenyl methane(DDM),and the linear epoxy resin was prepared by the re-action with bisphenol A epoxy resin.The chemical structure and properties of PDP were studied by hydrogen mag-netic resonance spectroscopy(HNMR),infrared spectroscopy(FTIR)and differential scanning calorimetry(DSC).The thermal resistance(T_(g))and rheological properties of linear epoxy resin were studied by DSC,FTIR and gel per-meation chromatography(GPC).The results showed that the viscosity of EP/PDP(1∶1 molar ratio)resin system increased from 0.55 Pa·s to 57 Pa·s with the extension of reaction time,while T_(g)increased from 55℃ to 120℃,ant the average molecular weight increased from 4651 to 25096.With the decrease of temperature,the viscosity of the system increases from 0.55 Pa·s at 200℃ to 60 Pa·s at 140℃.The T_(g) of EP/PDP resin system with different proportions increased with the increase of PDP excess ratio.When EP∶PDP was 0.8∶1,T_(g)was 121℃.At the same reaction time,the viscosity of the system increased with the increase of PDP excess ratio.