聚己内酯/聚硅氧烷/环氧树脂复合体系的形态和耐热性能  

Morphology and Thermal Properties of Polycaprolactone/Polydimethylsioxane/Epoxy Resin Composites

作　　者：宋江选[1] 刘平桂[1] 赫丽华[1] 梁兴泉[2] 李克文[2] 唐忠峰[3] 

机构地区：[1]北京航空材料研究院,北京100095 [2]广西大学化学化工学院,南宁530004 [3]广西工学院生物与化学工程系,广西柳州545006

出　　处：《材料工程》2007年第7期25-28,共4页Journal of Materials Engineering

基　　金：航空基金科学基金资助项目(04H21009)

摘　　要：利用—OH与—NCO的亲核加成反应,直接合成出端硅氧基封端的聚己内酯-聚二甲基硅氧烷(PCL-TESi/PDMS-TESi)。利用合成出的PCL-TESi/PDMS-TESi对环氧树脂进行复合改性,通过sol-gel技术及胺类固化剂与环氧基的交联作用固化复合体系。利用扫描电镜(SEM)、热失重分析(TGA)及在甲苯中的溶胀试验对不同含量的PCL-TE-Si/PDMS-TESi的复合材料进行了研究。结果表明,随着PCL-TESi/PDMS-TESi含量的增加,体系的交联密度下降。SEM结果表明,此复合体系微观上存在着两相结构,聚己内酯和聚硅氧烷柔性链的引入可显著改善环氧树脂的脆性。当环氧树脂与PCL-TESi/PDMS-TESi以1∶1(质量比)比例复合时,可显著提高体系的耐热性和柔韧性,其5%失重时的热分解温度可达310.2℃,比纯环氧树脂固化体系提高了144.4℃。Epoxy resin was modified with triethylsiloxane-terminated polycaprolactone- polydimethylsiloxane, which was directly synthesized via -OH and -NCO nuclephilic addition reaction. The modified system was cured with amino curing agent via anmio-glycidyl reaction and sol-gel process. The cured system was characterized by FT-IR, scanning electron microscopy （SEM）, thermogravimetry analysis （TGA） and swelling in toluene. The results showed that the crosslinking network density decreased with the increasing of the PCL-TESi/PDMS-TESi, and the toughness was also greatly improved by the elastomer particles, which was formed by flexible chain -Si-O- and -C-O-. And in TG analysis, the characteristic decomposition temperature at 5% mass loss was evidently increased from 155.8℃ of pure epoxy to 310.2℃ with PCL-TESi/PDMS-TESi ： EP=1 ： 1 （mass ratio）.

关 键 词：环氧树脂 端硅氧烷基聚己内酯 端硅氧烷基聚二甲基硅烷 形貌 耐热性 

分 类 号：TB332[一般工业技术—材料科学与工程]