[-PPO-PDMS-PHS-]n三元多嵌段共聚物的形态结构和性能

摘要/Abstract

利用DMA, TEM和SAXS对以聚苯醚(PPO)为硬段、聚对羟基苯乙烯(PHS)为半硬段和聚二甲基硅氧烷(PDMS)为软段的三元多嵌段共聚物[-PPO-PDMS-PHS-]n以三种嵌段相容相为连续相, PPO与PHS的相容相和PDMS相为两种分散相, 其tan δ随温度变化曲线在-100℃至200℃一直是一很高的平台, 并具有优异的力学性能, 较好地解决了含有机硅类嵌段共聚物强度低的弱点, 同时又保留了嵌段共聚物微相分离的特性。

关键词: 透射电子显微术, 嵌段共聚物, 相容性, 聚苯醚, 力学性能, 聚对羟基苯乙烯

The morphology and properties of [-PPO-PDMS-PHS-]n segmented ternary copolymers were investigated by DMA, TEM and SAXS techniques. It is shown that the continuous phase of [-PPO-PDMS-PHS-]n is the compatible phase composed of PDMS, PPO and PHS segments, and that there exist two dispersed phases, i, e. the PDMS phase and a mixed phase of half hard (PHS) and hard (PPO) segments. The tan δ vs.T curve of the segmented ternary copolymer with 66.7% (W/W) PDMS shows a rather high plateau in the temperature range from -120℃ to 200℃, which indicates that the copolymer has the characteristics of microphase separation as well as compatibility of block copolymers, respectively. Meanwhile, it has good tensile properties, which means that [-PPO-PDMS-PHS-]n has overcome the weakness of low strength of block or segmented copolymers containing PDMS.

Key words: TRANSMISSION ELECTRON MICROSCOPY, BLOCK COPOLYMER, COMPATIBILITY, POLYPHENYLENE OXIDE, MECHANICAL PROPETIES

中图分类号:

O631.3

引用此文

史林启,郑国栋,冯之榴. [-PPO-PDMS-PHS-]n三元多嵌段共聚物的形态结构和性能[J]. 化学学报, 1998, 56(2): 194-199.

SHI LINGQI;ZHENG GUODONG;FENG ZHILIU. Morphology and properties of [-PPO-PDMS-PHS-]n segmented ternary copolymers[J]. Acta Chimica Sinica, 1998, 56(2): 194-199.

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