SEPS elastomer-induced β-crystallization and the role of isothermal crystallization on enhancing the low-temperature toughness of polypropylene

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Jiayi Wang , Wenwen Yu , Zhiyi Zhang , Jiahao Shen , Ruimiao Liang , Xiaotian Nan , Fuyong Liu , Fengbo Zhu , Yonggang Shangguan , Qiang Zheng
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Abstract

In the quest to develop high-performance polypropylene (PP) blends with enhanced toughness, a blend was prepared by integrating poly (styrene-ethylene/propylene-styrene) (SEPS), which functions not only as an elastomer but also as a β-nucleating agent. The dispersion with a smaller interparticle distance of SEPS and its formation of an entangled network within PP significantly enhance the material's toughness, shifting the brittle-ductile transition temperature to lower values. Under natural cooling conditions, only a low amount of β-crystals forms. However, isothermal crystallization of PP with only elastomer added leads to a substantial increase in the quantity and aggregation of β-spherulites, resulting in enhanced intercrystalline connectivity and the development of “flower”-like aggregates. This unique microstructure, facilitated by SEPS, is highly effective in stress transfer and impact energy absorption. After isothermal crystallization, the relative content of β-crystals increases significantly, from 9.00 % to 29.55 %, leading to a remarkable 89.95 % increase in the impact strength of PP/SEPS blends at −10 °C. Importantly, the β-crystals produced through isothermal crystallization with SEPS as a nucleating agent exhibit greater stability compared to those formed using other β-nucleating agents.

Abstract Image

Abstract Image

SEPS弹性体诱导β结晶及等温结晶对提高聚丙烯低温韧性的作用
为了开发具有增强韧性的高性能聚丙烯(PP)共混物,通过整合聚苯乙烯-乙烯/丙烯-苯乙烯(SEPS)制备了一种共混物,该共混物不仅具有弹性体的功能,而且具有β-成核剂的功能。SEPS颗粒间距离越小的弥散体及其在PP内部形成的缠结网络显著增强了材料的韧性,使材料的脆-韧转变温度降低。在自然冷却条件下,只有少量β-晶体形成。然而,只加入弹性体的PP等温结晶导致β-球晶的数量和聚集量大幅增加,导致晶间连通性增强,形成“花”状聚集体。这种独特的微观结构,在SEPS的促进下,在应力传递和冲击能量吸收方面非常有效。等温结晶后,β-晶体的相对含量显著增加,从9.00%增加到29.55%,使得PP/SEPS共混物在-10℃时的冲击强度显著提高89.95%。重要的是,与使用其他β-成核剂形成的β-晶体相比,以SEPS作为成核剂通过等温结晶产生的β-晶体具有更高的稳定性。
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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