聚硅氧烷／聚己内酯／环氧树脂复合体系的制备及表面性能  

Preparation and surface properties of polydimethysiloxane/polycaprolactone/epoxy resin composites

作　　者：赫丽华[1] 刘平桂[1] 宋江选[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]北京化工大学材料科学与工程学院,北京100029

出　　处：《复合材料学报》2009年第3期60-66,共7页Acta Materiae Compositae Sinica

基　　金：航空基础科学基金(04H21009)

摘　　要：通过—OH和—NCO的亲核加成反应,直接合成出端硅氧烷基聚己内酯/聚硅氧烷混合物(PCL-TE-Si/PDMS-TESi),再与环氧树脂(EP)共混制得聚硅氧烷/聚己内酯/环氧树脂复合体系。利用扫描电镜、X光电子能谱对复合体系进行了两相相容性分析和表面元素分析,通过测试复合体系的表面接触角,利用Owens-Wendt-Kaelble模型推算出复合体系的表面张力,并研究了体系的耐水性。结果表明:复合体系在固化过程中,Si元素在一定程度上向表面迁移富集;50℃固化体系的两相相容性好于室温固化体系;室温固化体系的表面张力随PCL-TESi/PDMS-TESi含量的增加逐渐下降,且低于50℃固化体系的表面张力;复合体系耐水性优异,当PCL-TESi/PDMS-TESi与EP质量比为5∶5时,常温固化体系在50℃蒸馏水中浸泡7天后质量变化率小于1%。Silyl- terminated polycaprolactone/polydimethysiloxane （ PCL- TESi/PDMS-TESi ） was directly synthesized via -OH and -NCO nucleophilic addition reaction. A series of resin composites were prepared by blending epoxy and PCL - TESi/PDMS - TESi. The morphologies and the surface elements of the composite system were investigated by scanning electron microscopy and X ray photoelectron spectroscopy. The surface tension of the composite system was obtained based on the contact angle by Owens - Wendt Kaelble model. The water- resistance properties of the composites were also studied. The results show that the morphologies, surface tension and water resistance properties of the composites are quite dependent on the content of PCL - TESi/PDMS - TESi and the curing temperature. The surface tension decreases with increasing PCL - TESi/PDMS - TESi content because of the Si element migrating toward the surface to some extent. The compatibility of the two phases at 50℃ curing systems is better than that at room temperature curing systems, which results in that the composites cured at 50℃ have higher surface tensions than those cured at room temperature. When the mass ratio of PCL - TESi/PDMS - TESi to the epoxy is 5 ： 5, the mass change of composite cured at room temperature is below 1% after soak in distilled water at 50℃ for 7 days.

关 键 词：聚硅氧烷 聚己内酯 端硅氧烷化 环氧树脂 表面性能 耐水性 

分 类 号：TB332[一般工业技术—材料科学与工程]