Peroxydicarbonate modification of polypropylene and extensional flow properties
Peroxydicarbonate modification of polypropylene and extensional flow properties
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DOI：
10.1016/s0032-3861(01)00553-5
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发表时间：
2001-12-01
期刊：
影响因子：
4.6
通讯作者：
Gotsis, AD
中科院分区：
文献类型：
--
作者：
Lagendijk, RP;Hogt, AH;Gotsis, AD
在选定的有机过氧化二碳酸酯（PODIC）的存在下，使用反应挤出将长链分支（LCB）添加到初始线性聚丙烯（PP）中。通过高温尺寸排阻色谱结合在线特性粘度测量证实了LCB结构。与初始线性PP相比，支化样品显示出拉伸粘度的明显应变硬化、略低的熔体流动指数、增加的挤出物溶胀和熔体强度的提高，提高了高达两倍。所有的弹性性能都随着支化度的增加而增加。评价了不同结构的PODIC对PP的LCB改性效果。PODIC与非线性或大的线性烷基导致改性PP具有最高的支化度和最快的应变硬化。(C)2001爱思唯尔科技有限公司版权所有。
Long chain branches (LCB) were added to initially linear polypropylene (PP) using reactive extrusion in the presence of selected organic peroxydicarbonates (PODIC). The LCB structure was confirmed by high temperature size exclusion chromatography combined with on-line intrinsic viscosity measurements. Compared to the initial linear PP, the branched samples showed distinct strain hardening of the elongational viscosity, slightly lower Melt Flow Index, increased extrudate swelling and improvement of the melt strength by up to a factor of two. All elastic properties increased with the degree of branching. The efficiency of PODIC with varying structure for the LCB modification of PP was evaluated. PODIC with non-linear or large linear alkyl groups resulted in modified PP with the highest degree of branching and the fastest strain hardening. (C) 2001 Elsevier Science Ltd. All rights reserved.