聚二甲基硅氧烷
形态学(生物学)
相(物质)
聚氨酯
共聚物
材料科学
高分子化学
二硅氧烷
化学工程
化学
聚合物
纳米技术
复合材料
有机化学
催化作用
遗传学
生物
工程类
作者
Taeyi Choi,Jadwiga Weksler,Ajay Padsalgikar,Rebeca Hernéndez,James Runt
摘要
Three series of segmented polyurethane block copolymers were synthesized using 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BDO) or 1,3-bis(4-hydroxybutyl)tetramethyl disiloxane (BHTD) as the hard segments, and soft segments composed of poly(dimethyl siloxane) (PDMS)-based and poly(hexamethylene oxide) (PHMO) macrodiols. Copolymers synthesized with the PDMS macrodiol and PDMS and PHMO macrodiol mixtures consist of three microphases: a PDMS phase, hard domains, and a mixed phase of PHMO (when present), PDMS ether end-group segments and some dissolved hard segments. Degrees of phase separation were characterized using small-angle X-ray scattering by applying a pseudo two-phase model, and the morphology resulting from unlike segment demixing was found to be closely related to the in vitro oxidative biostability of these segmented polyurethanes.
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