期刊文献+

聚丙烯催化合金结构表征 被引量:16

MICROSTRUCTURE ANALYSIS OF POLYPROPYLENE REACTOR ALLOY
下载PDF
导出
摘要 用IR、DSC、NMR分析了聚丙烯催化合金中乙丙共聚物的微结构 ,发现在一定条件下合成的乙丙共聚物主要由两部分组成 :无规乙丙共聚物和各种不同序列长度的乙丙嵌段物组成 .加上丙烯均聚物 ,聚丙烯催化合金是一种具有多分散性结构的混合物.这种特殊的结构是聚丙烯催化台金具有高抗冲性的主要原因. The PP alloy was synthesized directly in the reactor with a 4^(th) generation Ziegler-Natta catalyst.It is very different from mechanically blended PP alloys,its properties,especially its impact strength,are superior to those of the latter.However,so far the studies on the stucture of this kind of PP alloys have not been reported.The microstructure of a PP alloy was characterized by IR,DSC,and ^(13)C-NMR.The sample was first fractionated and 8 fractions were obtained.The IR analysis showed that the ethylene content of each fraction is different.Except for the first fraction,which is an elastomer,the others are all hard powders at room temperature.Therefore,the fractions above 50℃ perhaps are all composed of ethylene-propylene block copolymers.DSC analysis showed that the melting curve of the PP alloy became broadened compared with that of i-PP,and a small peak appeared at 120℃.The extracts of PP alloy in boiling heptane and every fractions of PP alloy all exhibited many small peaks.These peaks demonstrated that the macromolecular chains in PP alloy are composed of ethylene-propylene blocks,whose sequence length are very different.The ^(13)C NMR spectrum of fraction at 90℃, similar to other fractions at 50~100℃,also indicated that there are long ethylene sequences in macromolecualr chains of PP alloy.According to the above analysis,a conclusion was reached that the E-P copolymer in PP alloy is composed of EPR and E-P blocks,with different ethylene sequence length.This polydispersity structure in PP alloy made it possess very high impact property.
出处 《高分子学报》 SCIE CAS CSCD 北大核心 2000年第6期692-695,共4页 Acta Polymerica Sinica
关键词 聚丙烯催化合金 乙丙共聚物 结构 聚丙烯共混物 PP alloy, PP blends in reactor, E-P copolymer
  • 相关文献

参考文献2

二级参考文献8

  • 1王立筱,高分子学报,1987年,2期,81页
  • 2钱保功,高聚物的转变与松弛,1986年
  • 3Yeh Polen,Polymer,1985年,26卷,1155页
  • 4Cheng H N,Macromolecules,1984年,17卷,1950页
  • 5谢有畅,塑料工业,1979年,1期,15页
  • 6Ke B,J Polym Sci,1962年,61卷,47页
  • 7Ke B,J Polym Sci,1960年,42卷,15页
  • 8潘鉴元,朱诚身,杨始堃,冯榕荫.等规聚丙烯β晶形态研究[J]高分子学报,1987(06).

共引文献21

同被引文献179

引证文献16

二级引证文献78

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部