Compatibilization of Isotactic Polypropylene (iPP) and High-Density Polyethylene (HDPE) with iPP–PE Multiblock Copolymers
Compatibilization of Isotactic Polypropylene (iPP) and High-Density Polyethylene (HDPE) with iPP–PE Multiblock Copolymers
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DOI：
10.1021/acs.macromol.8b01907
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发表时间：
2018-10
期刊：
影响因子：
5.5
通讯作者：
Jun Xu;J. Eagan;Sung‐Soo Kim;Sanshui Pan;Bongjoon Lee;K. Klimovica;Kailong Jin;Ting-Wei Lin
中科院分区：
文献类型：
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作者：
Jun Xu;J. Eagan;Sung‐Soo Kim;Sanshui Pan;Bongjoon Lee;K. Klimovica;Kailong Jin;Ting-Wei Lin
使用铪吡啶胺催化剂合成了一系列具有可调分子量的等规聚丙烯（iPP）和聚乙烯（PE）二嵌段、四嵌段和六嵌段共聚物（BCP）。 BCP 与 70 wt% 高密度 PE (HDPE) 和 30 wt% iPP 商业均聚物以 0.2 至 5 wt% 的浓度熔融共混。使用 TEM 研究所得共混物形态，结果显示均匀分散的 iPP 液滴尺寸逐渐变化，BCP 含量从不相容混合物直径的四分之三增加到四分之一。拉伸测试显示，基于断裂应变的韧性显着增强，仅添加 0.2 wt% BCP 时，断裂应变从未改性共混物的 10% 增加到 300% 以上，添加 0.5 wt% BCP 或更多时，韧性增加到 500% 以上。在共混物中加入 BCP 还提高了冲击韧性，将艾佐德冲击强度提高了一倍，达到与仅添加 1 wt% 添加剂的纯 HDPE 相当的水平。这些改进的BL...
A series of isotactic polypropylene (iPP) and polyethylene (PE) diblock, tetrablock, and hexablock copolymers (BCPs) were synthesized with tunable molecular weights using a hafnium pyridylamine catalyst. The BCPs were melt blended with 70 wt % high-density PE (HDPE) and 30 wt % iPP commercial homopolymers at concentrations between 0.2 and 5 wt %. The resulting blend morphologies were investigated using TEM, revealing uniformly dispersed iPP droplets ranging progressively in size with increasing BCP content from three-quarters to one-quarter of the diameter of the uncompatibilized mixture. Tensile tests revealed a dramatic enhancement in toughness based on the strain at break which increased from 10% for the unmodified blend to more than 300% with just 0.2 wt % BCP and over 500% with the addition of 0.5 wt % BCP or greater. Incorporation of BCPs in blends also improved the impact toughness, doubling the Izod impact strength to a level comparable to the neat HDPE with just 1 wt % additive. These improved bl...