STA-APS自组装双层膜的制备及其摩擦特性

利用自组装技术及氨基与羧基之间的酰胺化反应,成功地在单晶硅表面制备了3-氨基丙基-三乙氧基硅烷(APS)和硬脂酸(STA)的自组装双层膜。双层膜表面水接触角约98°,APS单层膜厚约0．5nm,STA单层膜厚约1．7nm。摩擦、磨损性能测试结果表明,STA-APS双层膜具有优异的摩擦特性,摩擦系数约0．06-0．08,在0．5N的载荷下,其抗磨寿命大于10000次;在1N的载荷下,其抗磨寿命也可达到6800多次,有望用作微型机械的润滑和防护材料。

Morphological and structural studies of sPS/aPS blends

The morphology and structure of the syndiotactic polystyrene (sPS)/atactic polystyrene (aPS) blends with various compositions have been studied by means of DSC, optical microscopy, SAXS, and WAXD. The results show that aPS is miscible with amorphous region of sPS. There is no macroscopic evidence that aPS forms separated domains in the blends. The decrease in crystallinity of sPS in the blends implies segregation of the aPS to the interfibrillar regions of the spherulites of sPS. The constancy of interlamellar distance and melting points indicates that the fibrillar structural units of sPS is unchanged on addition of aPS to sPS, and the unchanging parameters of the sPS unit cells mean that aPS does not enter the unit cells of sPS.