文章摘要
熔融支化法制备长支链聚乙烯的流变性能与结构表征
Rheology Properties and Characterization of Long Chain Branched Polyethylene by Melt Branching Reaction
  
DOI:10.16865/j.cnki.1000-7555.2017.11.011
中文关键词: 长支链  聚乙烯  流变学  熔体强度  活化能
英文关键词: long chain branching  polyethylene  rheology  melt strength  activation energy
基金项目:贵州大学研究生创新基金项目(研理工2016020)
作者单位
梁晓坤, 罗 筑, 杨 乐, 魏江涛, 陈维龙, 杨再军 贵州大学 材料与冶金学院 高分子材料与工程系贵州 贵阳 550025 
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中文摘要:
      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。
英文摘要:
      Long chain branched polyethylene (LCBPE) was prepared by melt branching reaction in the presence of dicumyl peroxide (DCP) and different vinyl multifunctional monomers. Fourier transformed infrared spectroscopy (FT-IR), high temperature gel permeation chromatography coupled with triple detectors and rheological methods were used to characterize the microstructure of the long chain branch (LCB). Especially, using viscosity MWD compared with the GPC MWD to carry out quantitative characterization of LCB. The forming mechanism and type of LCB were discussed in this paper. The effect of LCB on the discrete relaxation time spectrum, thermorheological behavior and melt strength of HDPE was studied by rheological method. The results show that LCBPE is a thermorheological complex fluid with star-branched structure by melt branching reaction. Moreover, the content of the LCB increases with the increasing of functionality of the vinyl multifunctional monomers. Among all the modified samples, the sample modified with tetrafunctional monomer has the maximum content of LCB and the best modification result. Compared to linear HDPE, LCBPE has longer relaxation time, higher activation energy and melt strength.
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