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以氨丙基硅氧烷偶联剂和端羟基聚二甲基硅氧烷(PDMS)为原料,合成了端氨丙基聚二甲基硅氧烷低聚物(SN2),并将其作为扩链剂,制备了有机硅-聚氨酯(Si-PU)嵌段共聚物.考察了聚氨酯预聚体的加料比(rNCO/OH)、SN2与聚氨酯预聚体的加料比(rNH2/NCO)对Si-PU嵌段共聚物溶液流变行为及其膜性能的影响.研究发现,该Si-PU共聚物的异丙醇溶液呈现较低的表观黏度及牛顿特性;成膜时,有机硅链段向表面迁移;膜表面对水的接触角达110°以上,且随着有机硅链段含量的增高而增大;共聚物膜的24 h吸水率较低(<1.5 wt%);但当有机硅链段含量过高时,吸水率反而增高.
Aminopropyldimethicone oligomer (SN2) was synthesized from aminopropyl siloxane coupling agent and hydroxyl-terminated polydimethylsiloxane (PDMS) (RNCO / OH), the ratio of SN2 to polyurethane prepolymer feed ratio (rNH2 / NCO) Si-PU block copolymer solution rheological behavior and membrane properties of the study found that the isopropanol solution of the Si-PU copolymer exhibits lower apparent viscosity and Newtonian properties; film formation, the organic silicon chain The contact angle of water to the surface of the membrane reached more than 110 ° and increased with the increase of the content of silicone segments; the water absorption of copolymer membrane was lower (<1.5 wt%) in 24 h; Silicone segment content is too high, the water absorption but increased.