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首页> 外文期刊>RSC Advances >Simultaneously enhancing strength and toughness for impact polypropylene copolymers by regulating the dispersed phase with high density polyethylene
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Simultaneously enhancing strength and toughness for impact polypropylene copolymers by regulating the dispersed phase with high density polyethylene

机译：通过用高密度聚乙烯调节分散相，同时提高抗冲聚丙烯共聚物的强度和韧性

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摘要

By introducing high density polyethylene (HDPE) into the dispersed phase of impact polypropylene copolymers (IPCs), the morphologies of IPC/HDPE blends were regularly tailored and consequently the tensile and impact properties were simultaneously improved. Morphological observations showed a series of multilayered core-shell dispersed particles when the content of HDPE was less than 40%, while the continuous network structure was observed beyond 40%. With an increase in the content of HDPE, the size of the core increased and the number of dispersed particles with incomplete encapsulated polyethylene (PE) cores rose. More valid 'bridges' made up of segmented ethylene-propylene copolymer (sEbP) appeared and connected the PE core and polypropylene (PP) matrix. Meanwhile, co-crystallization occurred in the core phase, between long ethylene chain segments of the joined HDPE and sEbP in multi-component IPCs. The increased HDPE in blends reduced defective co-crystals, and in turn led to a thicker average lamellar thickness and thinner amorphous thickness of PE. Partial inserted ethylene-propylene random sequences are constrained by narrowed PE amorphous layers. Hence, the connection between the PP matrix and the dispersed phase was strengthened by co-crystals, 'bridges' and restriction effects. The tensile strength of the blends was slightly enhanced with an increase in HDPE, while the greatly improved toughness was achieved at a HDPE content of 30 wt% and kept constant with more HDPE. Thus, the interactions rather than core-shell phase morphology are regarded as the predominate factor for the excellent properties.
机译：通过将高密度聚乙烯（HDPE）引入到抗冲聚丙烯共聚物（IPC）的分散相中，可以有规律地调整IPC / HDPE共混物的形态，从而同时提高了拉伸性能和冲击性能。形态学观察表明，当HDPE含量小于40％时，出现了一系列的多层核-壳分散颗粒，而连续网络结构则超过40％。随着HDPE含量的增加，核的尺寸增加，具有不完全包封的聚乙烯（PE）核的分散颗粒数量增加。出现了更多由嵌段乙烯-丙烯共聚物（sEbP）构成的有效“桥”，并连接了PE芯和聚丙烯（PP）基质。同时，在多组分IPC中，HDPE和sEbP的长乙烯链段之间的核心相中发生了共结晶。共混物中HDPE的增加减少了有缺陷的共晶，进而导致PE的平均层状厚度增加和非晶态厚度变薄。部分插入的乙烯-丙烯无规序列受狭窄的PE无定形层约束。因此，共晶，“桥”和限制效应加强了PP基体与分散相之间的连接。共混物的拉伸强度随HDPE的增加而略有提高，而HDPE含量为30 wt％时，韧性大大提高，而HDPE越多，其韧性就越稳定。因此，相互作用而不是核-壳相形态被认为是优异性能的主要因素。

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