Structure of molten stereoregular polyolefins with different side-chain sizes: Linear polyethylene, polypropylene, poly(1-butene), and poly(4-methyl-1-pentene)

被引：0
|
作者：
Kim, MH
Londono, JD
Habenschuss, A [1 ]
机构：
[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[2] Dupont Co, Expt Stn Lab, Wilmington, DE 19880 USA
来源：
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2000年 / 38卷 / 18期
关键词：
polyolefins; X-ray diffraction; polymer melts; structure; polyethylene (PE); isotactic polypropylene (iPP); isotactic poly(1-butene) (iP1B); isotactic poly(4-methyl-1-pentene) (iP4M1P);
D O I：
10.1002/1099-0488(20000915)38:18<2480::AID-POLB150>3.0.CO;2-8
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The melt structures of linear polyethylene and the isotactic vinyl polymers polypropylene, poly(1-butene), and poly(4-methyl-1-pentene), along with the corresponding methyl, ethyl, and isobutyl side chains, were studied with wide-angle X-ray diffraction. As the size of the side branch increases from zero (polyethylene) to methyl, ethyl, and isobutyl, a prepeak appears below the main diffraction peak in the total structure factor. The prepeaks become stronger and shift to lower scattering vectors with increasing bulkiness of the side chain. There is a strong correlation between the position of the prepeaks in the melt and the average nearest-neighbor helix-helix packing distance in the crystals, implying similar helical conformations in the melts. (C) 2000 John Wiley & Sons, Inc.*
引用
收藏
页码：2480 / 2485
页数：6
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