摘要： 分别以双端单羟基聚二甲基硅氧烷和单端双羟基聚二甲基硅氧烷合成了有机硅改性水性聚氨酯分散体(SiPU)，并对其进行测试和表征。 通过衰减全反射红外(ATR-IR)表征了乳胶膜的结构;并通过粒径、接触角、力学性能和耐水性测试分析改性效果。结果表明:接枝改性效果明显优于嵌段改性，聚二甲基硅氧烷(PDMS)在乳胶膜表面富集更明显，甚至基本可达全覆盖。

关键词: 水性聚氨酯, 单端双羟基聚二甲基硅氧烷, 接枝改性, 富集

Abstract: An organosilicone modified waterborne polyurethane dispersion( SiPU) was synthesized respectively by double dihydroxy-terminated PDMS and single dihydroxy-terminated PDMS. The measurement and characterization of SiPU was conducted. The structure of latex film was characterized by ATR-IR. And the modification effects of SiPU were compared by particle size measurement, contact angle measurement, mechanical properties measurement and water resistance measurement. The results showed that graft modification was obviously better than the block modification. For graft modification, PDMS enriched more obviously on surface of latex film, and even gave a complete coverage.

Key words: waterborne polyurethane, single dihydroxy-terminated PDMS, graft modification, enrichment