水分散有机硅-聚氨酯嵌段共聚物的合成与性能  

Synthesis and Properties of Aqueous Polysiloxane-Polyurethane Block Copolymer

作　　者：华继军[1,2] 倪加旎[1,2] 高传花[1,2] 林薇薇[1,2] 郑强[1,2] 

机构地区：[1]浙江大学高分子科学与工程学系,浙江杭州310027 [2]高分子合成与功能构造教育部重点实验室,浙江杭州310027

出　　处：《高分子材料科学与工程》2009年第2期28-30,共3页Polymer Materials Science & Engineering

基　　金：国家基础研究专项经费(2005CB623800);浙江省重大科技攻关项目资助(2006C11050)

摘　　要：通过两步法合成了水分散有机硅-聚氨酯嵌段共聚物,并考察了体系中有机硅含量的变化对薄膜力学性能、热性能、硬度以及薄膜表面接触角的影响。发现随着体系中有机硅含量的增高,热稳定性有所提高,薄膜拉伸强度和模量增大,而断裂伸长率呈先减小后增大的趋势;与此同时,薄膜表面接触角增大,体系有较好的拒水性。Aqueous polysiloxane-polyurethane block copolymer was synthesized by two-step method, and the influence of the siloxane content in the block copotymer on mechanical properties, thermal properties, hardness, and surface contact angle was also studied. It is found that, as the siloxane content in the copolymer increases; the tensile strength and the modulus increases, while elongation at break decreases first and then increases. The thermal stability is also enhanced with the addition of polysiloxane segment. The surface contact angle increases with the increase of the siloxane content, which results in good water resistance for the system.

关 键 词：水分散 有机硅 聚氨酯 嵌段共聚 

分 类 号：TQ316.344[化学工程—高聚物工业]