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结晶聚合物品相相容性的研究

STUDY ON THE CRYSTALLINE PHASE COMPATIBILITY OF POLYMERS

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【作者】 许承威方征平鲍诗杰乐启发

【Author】 XU Chengwei;FANG Zhengping;Shijie;LE Qifa(Department of Chemistry;Hangzhou 310028)

【机构】 杭州大学化学系

【摘要】 通过DSC、X-射线衍射、红外光谱及拉伸试验研究了HDPE与LLDPE、HDPE与LDPE之间的晶相相容性.结果表明,链结构相近的HDPE和LLDPE的晶相相容性好,能形成共晶;而链结构差异较大的HDPE和LDPE的晶相相容性较差,倾向于分别结晶,但有部分链段被对方的晶区夹持.不论是支化度大的LDPE链段插入以HDPE为主的晶区,还是支化度小的HDPE链段插入以LDPE为主的晶区,都可破坏晶区的规整性.共晶的形成使共混物的熔点、结晶度、晶粒体积等低于两组份的线性加和,而力学性能,尤其是断裂伸长率,则显著提高,呈协同效应.

【Abstract】 rystalline phase compatibilities between LLDPE,HDPE and LDPE was studied through DSC,WAXD,IR and tensile test.It is found that LLDPE which has similar chain structure as HDPE,is compatible with HDPE in crystalline state.While LDPE,which has more different chain structure,has poor compatibility with HDPE. HDPE and LDPE chains are inclined to crystallize separately in the existence of partial chain interpenetration Not only LDPE chains which have larger number of branches penetrating into HDPE crystal,but also HDPE chains which have smaller number of branches,penetrating into LDPE crystal,can destroy the regularity of the crystal.The formation of cocrystal make the melting points,crystallinities and crystal dimensions of the blends to be smaller than the linear sum of the two components.Whereas the mechanical propertiesespectially in elongational characteristics improve dramatically.

【基金】 国家重点化学工程联合实验室聚合反应工程实验室资助
  • 【文献出处】 高分子学报 ,ACTA POLYMERICA SINICA , 编辑部邮箱 ,1996年01期
  • 【分类号】O743.51
  • 【被引频次】4
  • 【下载频次】187
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