聚醚硅氧烷/ 聚倍半硅氧烷双重改性蓖麻油基水性聚氨酯

Castor Oil Based Waterborne Polyurethane Doubly Modified by PEPSO and POSS

摘要:

以蓖麻油与聚醚硅氧烷（PEPSO）互混作为多元醇原料制备出植物油基水性聚氨酯。在预聚体合成过程中，加入不同含量的四羟基八苯基双层笼型倍半硅氧烷，通过醇羟基与异氰酸酯基的反应，将聚倍半硅氧烷（POSS）引入到植物油聚氨酯基体中，制备出聚氨酯纳米复合材料，并探讨纳米粒子-聚倍半硅氧烷对聚氨酯材料热稳定性，表面疏水性及力学性能的影响。热重分析（TGA）结果表明，复合材料的初始降解温度 T5% 和最终稳定温度 Tf 都会提高；静态接触角测试结果表明随 POSS 含量的增加，材料表面的疏水性随之增大。同时从扫描电镜图中可以看到，随着 POSS 含量的增加，断面的不平整度增大，粒子间的团聚愈发严重；拉伸测试结果表明 POSS 的引入能在一定程度上提高材料的拉伸强度。

Abstract:

Plant oil based polyurethanes were synthesized using the mixture of PEPSO and castor oil as raw materials. During the synthesis of prepolymer, different content of double-decker octaphenylsilsesquioxanetetraol (DDSQ-4OH) was introduced into the polyurethane molecular chains through the chemical reaction between OH of DDSQ-4OH and NCO of IPDI. Consequently, a series of emulsion particle distributions and nanocomposites with different DDSQ-4OH contents were acquired and numbers of characterizations were taken to evaluate the properties of these materials such as FT-IR, particle size analyzer, thermal stability, mechanical properties and surface hydrophobicity. TGA results show that the hybrid polyurethanes display both enhanced initial decomposition temperatures (T5% ) and final stable temperature (Tf). Contact angle test results show that with the introduction of DDSQ-4OH, the hydrophobicity of hybrid polyurethanes can be enhanced to some extent. The morphology observed by scanning electron microscopy (SEM) showed that DDSQ-4OH may occur to aggregate with high mass content. Mechanical test results show that with the introduction of DDSQ-4OH, the tensile strength of hybrid polyurethanes can be enhanced to some extent．