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Flow mark defects reduction of injection-molded polypropylene by dynamically vulcanized polyolefin elastomer
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-07-16 , DOI: 10.1002/pen.25756
Guodian Zhu 1, 2 , Zhuoxi Li 3 , Jingqi Shang 1 , Jiao Ding 1 , Yuanyuan Li 4 , Guoqiang Yin 1
Affiliation  

Flow mark defects (FMs) worsen surface esthetics and mechanical properties of injection-molded polypropylene (PP). In this work, experiments and dissipative particle dynamic (DPD) simulations were used to investigate the effect of dynamically vulcanized polyolefin elastomer (POE) on FMs of injection-molded PP. Significant FMs reduction was achieved by dynamically vulcanized POE. DPD simulations indicated that POE molecules were randomly distributed in the PP, while dynamic vulcanization led to the formation of elastomeric quasi-clusters, and these quasi-clusters were able to reduce FMs. Both DPD simulations and scanning electron microscopy results showed that more agglomerates with longer and irregular shapes formed with longer vulcanization time and more initiators. The formation of too many agglomerates resulted in different pock surface defects. Dynamically vulcanized POE produced at optimal reaction conditions did not affect the tensile strength, tensile modulus, flexural strength, and flexural modulus, while breaking elongation and notched Izod impact strength of injection-molded PP decreased slightly. This work suggests that the addition of dynamically vulcanized POE may be a promising way to reduce FMs of injection-molded PP.

中文翻译:

动态硫化聚烯烃弹性体减少注塑聚丙烯流痕缺陷

流痕缺陷 (FM) 会恶化注塑聚丙烯 (PP) 的表面美感和机械性能。在这项工作中,实验和耗散粒子动力学 (DPD) 模拟被用来研究动态硫化聚烯烃弹性体 (POE) 对注塑 PP FM 的影响。动态硫化的 POE 显着减少了 FM。DPD 模拟表明 POE 分子随机分布在 PP 中,而动态硫化导致弹性准簇的形成,这些准簇能够减少 FM。DPD 模拟和扫描电子显微镜结果均表明,硫化时间越长,引发剂越多,形成的团块越长,形状越不规则。太多团块的形成导致不同的麻点表面缺陷。在最佳反应条件下生产的动态硫化 POE 不影响拉伸强度、拉伸模量、弯曲强度和弯曲模量,而注​​塑 PP 的断裂伸长率和缺口 Izod 冲击强度略有下降。这项工作表明,添加动态硫化的 POE 可能是减少注塑 PP FM 的一种有前景的方法。
更新日期:2021-09-06
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