Polypropylene Composites with Ultrahigh Low-Temperature Toughness by Tuning the Phase Morphology
Polypropylene Composites with Ultrahigh Low-Temperature Toughness by Tuning the Phase Morphology
复制标题
DOI：
10.1021/acs.iecr.2c02818
复制
发表时间：
2022-10
期刊：
影响因子：
--
通讯作者：
Zhongguo Zhao;Shengtai Zhou;Lijun Quan;W. Xia;Qian Fan;Peng-Yun Zhang;Yanhui Chen;Dahang Tang
中科院分区：
文献类型：
--
作者：
Zhongguo Zhao;Shengtai Zhou;Lijun Quan;W. Xia;Qian Fan;Peng-Yun Zhang;Yanhui Chen;Dahang Tang
为了拓宽等规聚丙烯（iPP）在低温条件下的应用前景，通过调节碳纳米管（CNT）含量，赋予iPP/0.1wt% β-成核剂/30wt%乙烯-辛烯多嵌段共聚物（iPP/0.1wt% β-NAs/30wt%烯烃嵌段共聚物（OBC））共混物低温冲击韧性。与纯iPP相比，仅添加0.5wt%CNTs的iPP/0.1wt% β-NAs/30wt%OBC复合材料在-20 °C时的低温冲击韧性高达52.2kJ/m2，其中冲击强度提高约2386%。这种最佳含量的CNT导致β-成核iPP复合材料中的共连续相形态，这被证明是即使在低温环境下也能大大增强应力耗散的关键。此外，CNTs在iPP和OBC两相之间的分布以及β-NAs和OBC诱导的自增韧β-晶体的存在有助于提高iPP基复合材料的低温冲击强度。提出了一种切实可行的增强聚丙烯基复合材料低温韧性的方法，扩大了其在工业领域的应用潜力。
To broaden the potential application of isotactic polypropylene (iPP) in low-temperature conditions, iPP/0.1 wt % β-nucleated agent/30 wt % ethylene–octene multiblock copolymer (iPP/0.1 wt % β-NAs/30 wt % olefin block copolymer (OBC)) blends were endowed with ultrahigh low-temperature impact toughness by adjusting the nanotube (CNT) content. In comparison with pure iPP, the low-temperature impact toughness of iPP/0.1 wt % β-NAs/30 wt % OBC composites with only the addition of 0.5 wt % CNTs reached as high as 52.2 kJ/m2at −20 °C, of which the increment of impact strength was about 2386%. This optimum content of CNTs gave rise to a co-continuous phase morphology in β-nucleated iPP composites, which turned out to be the key to greatly enhanced stress dissipation, even in a low-temperature environment. In addition, the distribution of CNTs between iPP and OBC phase and the presence of self-toughened β-crystals that were induced by β-NAs and OBC contributed to improving the low-temperature impact strength of iPP-based composites. A feasible strategy is developed to substantially reinforce the low-temperature toughness of iPP-based composites, which expands their potential applications in industrial sectors.