| 两嵌段共聚物PB-PDMS中PDMS的结晶行为与共聚物形态结构的关系 |
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| 引用本文： | 李卫东,方天如,黄葆同.两嵌段共聚物PB-PDMS中PDMS的结晶行为与共聚物形态结构的关系[J].应用化学,1987,0(5):74-77. |
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| 作者姓名： | 李卫东 方天如 黄葆同 |
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| 作者单位： | 中国科学院长春应用化学研究所 |
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| 摘 要： | 聚二甲基硅氧烷(PDMS)的结晶熔融温度(Tm)约为-43℃,远高于其玻璃化转变温度(Tg)(-124℃),为扩大其低温使用范围,需要破坏其链结构规整性以抑制结晶发生。但是我们发现在前人工作中,含PDMS段的嵌段共聚物,即使不破坏PDMS段的链结构规整性,其动态力学谱上有时也观测不到PDMS的结晶峰。遗憾的是这些作者末曾对这一不寻常现象给予足够的重视。无疑,搞清共聚物中PDMS不寻常结晶行为同共聚物形态结构的关系,对提高含有PDMS段的嵌段型热塑性弹性体的低温使用范围将有指导意义。本文报导PB-PDMS中的结晶行为与共聚物形态结构的关系。
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| 收稿时间： | 1986-03-24 |
| 修稿时间： | 1987-02-14 |
THE RELATIONSHIP BETWEEN CRYSTALLIZATION BEHAVIOR AND MORPHOLOGY OF PDMS IN POLY(BUTADIENE-b-DIMETHYLSILOXANE) |
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| Li Weidong,Fang Tianru,Huang Baotong.THE RELATIONSHIP BETWEEN CRYSTALLIZATION BEHAVIOR AND MORPHOLOGY OF PDMS IN POLY(BUTADIENE-b-DIMETHYLSILOXANE)[J].Chinese Journal of Applied Chemistry,1987,0(5):74-77. |
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| Authors: | Li Weidong Fang Tianru Huang Baotong |
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| Institution: | Changchun Institute of Applied Chemistry, Academia Sinica |
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| Abstract: | DSC results of poly(butadiene-b-dimethylsiloxane) diblock copolymers(PB-PDMS) with defined composition and molecular weight and narrow molecular weight distribution, synthesized by anionic sequential polymerization, showed that Tg of both blocks did not change with molecular weight and composition of the block copolymers, indicating a phase separation of the blocks. The crystallization behavior of PDMS block, however, was found to be effected by the composition and molecular weight of the block copolymers. TEM graphs and DSC results showed a clear relationship between crystallization behavior of PDMS and the morphology of PB-PDMS. |
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