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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and Characterization of High-Density Polypropylene-Grafted Polyethylene via a Macromolecular Reaction and Its Rheological Behavior
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Synthesis and Characterization of High-Density Polypropylene-Grafted Polyethylene via a Macromolecular Reaction and Its Rheological Behavior

机译：高密度聚丙烯接枝聚乙烯的高分子反应及其流变行为的表征

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High-density polyethylene grafted isotactic polypropylene (PP-g-HDPE) was prepared by the imidization reaction between maleic anhydride grafted polyethylene and amine-grafted polypropylene in a xylene solution. The branch density was adjusted by changes in the molar ratio between maleic anhydride and primary amine groups. Dynamic rheology tests were conducted to compare the rheological properties of linear polyolefins and long-chain-branched polyolefins. The effects of the density of long-chain branches on the rheological properties were also investigated. It was found that long-chain-branched hybrid polyolefins had a higher storage modulus at a low frequency, a higher zero shear viscosity, a reduced phase angle, enhanced shear sensitivities, and a longer relaxation time. As the branch density was increased, the characteristics of the long-chain-branched Structure became profounder. The flow activation energy of PP-g-HDPE was lower than that of neat maleic anhydride grafted polypropylene (PP-g-MAH) because of the lower flow activation energy of maleic anhydride grafted high-density polyethylene (HDPE-g-MAH). However, the flow activation energy of PP-g-HDPE was higher than that of PP-g-MAH/HDPE-g-MAH blends because of the presence of long-chain branches. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2553-2561, 2009
机译：通过在二甲苯溶液中马来酸酐接枝的聚乙烯与胺接枝的聚丙烯之间的酰亚胺化反应制备了高密度聚乙烯接枝的全同立构聚丙烯（PP-g-HDPE）。通过改变马来酸酐与伯胺基团之间的摩尔比来调节支链密度。进行动态流变学测试以比较线性聚烯烃和长链支化聚烯烃的流变性能。还研究了长链分支的密度对流变性质的影响。发现长链支化的杂化聚烯烃在低频下具有更高的储能模量，更高的零剪切粘度，减小的相角，增强的剪切敏感性以及更长的松弛时间。随着分支密度的增加，长链支化结构的特征变得更加深刻。 PP-g-HDPE的流动活化能低于纯马来酸酐接枝的聚丙烯（PP-g-MAH），因为马来酸酐接枝的高密度聚乙烯（HDPE-g-MAH）的流动活化能较低。然而，由于存在长链支链，因此PP-g-HDPE的流动活化能高于PP-g-MAH / HDPE-g-MAH共混物。 （c）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2553-2561，2009

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