Effect of chain structure on the melt rheology of modified polypropylene
Effect of chain structure on the melt rheology of modified polypropylene
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DOI：
10.1002/(sici)1097-4628(19990822)73:8
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发表时间：
1999-08
影响因子：
3
通讯作者：
M. Sugimoto;Tadashi Tanaka;Yuichi Masubuchi;J. Takimoto;K. Koyama
中科院分区：
文献类型：
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作者：
M. Sugimoto;Tadashi Tanaka;Yuichi Masubuchi;J. Takimoto;K. Koyama
研究了聚丙烯（PP）分子结构对电子辐照聚合物和过氧化二氢二（2-乙基己基）己酯（EHPC）处理聚合物熔体流变性能的影响。通过流变行为、分子量分布和支化度等方面对改性产物进行了考察。采用50和80 kGy辐照并加入EHPC，可获得高熔体强度PP。改性PP的线拉伸粘度低于未改性PP，但单轴拉伸粘度表现出应变硬化。低角度激光光散射测量的改性PP显示有趣的结果;高辐照剂量，如50和80 kGy引起更高的分子量链支化。然而，EHPC改性PP没有检测到长支链，这也表明在单轴拉伸流动的应变硬化。本文讨论了链结构与流变性能的关系。© 1999 John Wiley & Sons，Inc.应用聚合物科学杂志73：1493-1500，1999
The effect of molecular structure of polypropylene (PP) on the melt rheological properties were investigated for electron irradiated polymer and di-2-ethylhexyl peroxy dicarbonate (EHPC)-treated polymer. The modifications were examined in terms of the rheological behaviors, molecular weight distribution, and the degree of branching. The high melt strength PP was obtained by irradiating with 50 and 80 kGy and adding EHPC. The modified PPs showed the strain hardening in the uniaxial elongational viscosity, though the linear elongational viscosity was lower than that of the unmodified PP. Low angle laser light-scattering measurements of the modified PPs showed the interesting results; high irradiation doses such as 50 and 80 kGy caused higher molecular weight chains branching. Nevertheless, the long branching chains were not detected for the EHPC modified PP, which also showed the strain hardening in uniaxial elongational flow. In this article, the relation between chain structure and rheological properties is discussed. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1493–1500, 1999