Toughened polypropylene random copolymer with olefin block copolymer
Toughened polypropylene random copolymer with olefin block copolymer
复制标题
增韧聚丙烯无规共聚物与烯烃嵌段共聚物
DOI：
10.1016/j.matdes.2016.06.052
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发表时间：
2016-10-05
影响因子：
8.4
通讯作者：
Feng, Jiachun
中科院分区：
文献类型：
--
作者：
Ren, Qilin;Fan, Jiashu;Feng, Jiachun
研究了烯烃嵌段共聚物（OBC）在室温和低温（0 ℃）下对聚丙烯无规共聚物（PPR）的增韧作用。力学性能测试表明，OBC是一种有效的PPR冲击改性剂。当OBC的加入量为5wt%时，共混物的室温和0 ℃缺口冲击强度分别为66.5，9.27 kJ/m2，提高了135.8%和43.9%。在0 ° C下，含有10重量% OBC的共混物的该值为60.2 kJ/m2，这比相同温度下原始PPR的值高约8倍。由于OBC的熔点较高，其加入引起的刚性下降相当轻微。含10wt%OBC的共混物的拉伸强度和弯曲模量仅比原始PPR低8.3和113%。形态、结晶和流变行为的研究表明，PPR球晶尺寸的减小以及PPR基体与OBC分散相之间良好的相容性是韧性提高的主要原因。本研究为制备刚韧性平衡的PPR提供了一种简单有效的方法。(C)2016爱思唯尔有限公司版权所有
In this work, the toughening effect of olefin block copolymer (OBC) on polypropylene random copolymer (PPR) at room and low temperature (0 degrees C) was investigated. Mechanical tests showed that OBC is an effective impact modifier for PPR. By addition of only 5 wt% of OBC, the notched Izod impact strength of resulting blends at room temperature and 0 degrees C are 66.5, 9.27 kJ/m(2), which are increased 135.8 and 43.9%, respectively. This value for blends containing 10 wt% OBC at 0 degrees C is 60.2 kJ/m(2), which is approximately eight times higher than that of pristine PPR at same temperature. Due to the high melting point of OBC, the decline of rigidity caused by its addition is rather slight. The tensile strength and flexural modulus for blends containing 10 wt% OBC is only 8.3 and 113% lower than that of pristine PPR. The investigation of morphology, crystallization and rheological behaviors suggested that the great improvement of toughness might be attributed to the decrease of PPR spherulites size and the excellent compatibility between PPR matrix and OBC dispersed phase. This work offers a simple and effective approach to produce PPR with stiffness-toughness balance. (C) 2016 Elsevier Ltd. All rights reserved.