熔融支化法制备长支链聚乙烯的流变性能与结构表征

发布时间：2018-04-25 17:34

本文选题：长支链 + 聚乙烯　；参考：《高分子材料科学与工程》2017年11期

【摘要】：通过熔融支化法使用过氧化二异丙苯(DCP)引发不同官能度数目的乙烯基多官能度单体改性HDPE制备出长支链聚乙烯(LCBPE),采用傅里叶变换红外光谱、三检测器凝胶渗透色谱及流变学方法对长支链(LCB)结构进行表征,尤其是根据黏度MWD和凝胶渗透色谱MWD对LCB进行定量表征。讨论了LCB形成的机理,确定了LCB类型。采用流变学方法研究了LCB结构对HDPE的离散松弛谱,热流变行为及熔体强度的影响。结果表明,通过本熔融支化法制备的LCBPE是一种热流变复杂流体,均为星型支化结构,且LCB含量随着乙烯基多官能度单体官能度的增加逐渐增大,其中利用四官能度单体改性的试样LCB含量最多,改性效果最好。此外LCBPE相比线型HDPE具有更长的松弛时间,更高的活化能及熔体强度。
[Abstract]:Long branched polyethylene (LCBPE) was prepared by melt branching method using diisopropyl peroxide (DCPP) as initiator of different functional degrees of vinyl polyfunctional monomer modified HDPE, and Fourier transform infrared spectroscopy (FTIR) was used. Three detector gel permeation chromatography (GPC) and rheological method were used to characterize the structure of LCBs, especially the quantitative characterization of LCB based on viscosity MWD and gel permeation chromatography (MWD). The formation mechanism of LCB was discussed and the type of LCB was determined. The effects of LCB structure on the discrete relaxation spectrum, thermal rheological behavior and melt strength of HDPE were studied by rheological method. The results show that the LCBPE prepared by the melt branching method is a heat flux complex fluid with star branched structure, and the content of LCB increases with the increase of the functional degree of vinyl polyfunctional monomer. The LCB content of the sample modified by tetrafunctional monomer was the highest and the modification effect was the best. In addition, LCBPE has longer relaxation time, higher activation energy and melt strength than linear HDPE.
【作者单位】：贵州大学材料与冶金学院高分子材料与工程系;
【基金】：贵州大学研究生创新基金项目(研理工2016020)
【分类号】：TQ325.12

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