Rheology and thermal behavior of long branching polypropylene prepared by reactive extrusion
Rheology and thermal behavior of long branching polypropylene prepared by reactive extrusion
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DOI：
10.1002/app.30061
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发表时间：
2009-08
影响因子：
3
通讯作者：
Fenghua Su;Hanxiong Huang
中科院分区：
文献类型：
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作者：
Fenghua Su;Hanxiong Huang
长链支化聚丙烯（LCB-PP）是在双功能单体[1,6-己二醇二芳基化物（HDDA）]和过氧化二异丙苯（DCP）的过氧化物存在下通过反应挤出获得的。比较评价HDDA和DCP浓度对支化效率的影响。傅里叶变换红外光谱(FTIR)结果表明发生了接枝反应，HDDA已接枝到PP骨架上。与初始PP相比，一些改性样品由于骨架中存在大量LCB而表现出较低的熔体流动指数。使用几个流变图研究了初始PP和改性PP的流变特性，流变特性证实了改性PP骨架中的LCB。 DSC结果表明，改性PP的结晶温度高于初始PP和降解PP，表明改性PP具有长链支化结构。改性PP流变学的对比研究表明，适当浓度的HDDA和DCP更有利于反应挤出过程中生产LCB。 © 2009 Wiley periodicals, Inc. J Appl Polym Sci，2009
Long-chain branching polypropylene (LCB-PP) was achieved by reactive extrusion in the presence of bifunctional monomer [1,6-hexanediol diarylate (HDDA)] and peroxide of dicumyl peroxide (DCP). Influences of HDDA and DCP concentrations on the branching efficiency were comparatively evaluated. Fourier transformed infrared spectroscopy (FTIR) results indicated that the grafting reaction took place, and HDDA has been grafted on PP skeleton. In comparison with initial PP, some modified samples showed lower melt flow index because of a large number of LCB in their skeleton. Several rheology plots were used to investigate the rheological properties of the initial PP and modified PPs, and the rheological characteristics confirmed the LCB in modified PPs skeleton. DSC results showed that the crystallization temperatures of modified PPs were higher than those of initial PP and degraded PP, suggesting that the modified PPs had long-chain branched structure. The contrastive investigation in the rheology of modified PPs suggested that proper concentrations of HDDA and DCP were more beneficial to producing LCB during reactive extrusion. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009