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Investigation of structure-morphology-function relationship of plastomers used to produce low mold shrinkage thermoplastic olefins
European Polymer Journal ( IF 6 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.eurpolymj.2021.110758
Çağla Girişken 1, 2 , Senem Avaz Seven 1 , Osman Gökhan Ersoy 2 , Yusuf Ziya Menceloğlu 1, 3
Affiliation  

Thermoplastic Polyolefins (TPOs) are one of the most commonly used polymeric materials in automotive industry due to their better elastomeric properties compare to commercial polyolefins. Thermoplastic polyolefin (TPO), or olefinic thermoplastic elastomers are prepared by mixing a polyolefin usually copolymer polypropylene and a plastomer in certain fraction in order to improve elastomeric properties. One of the most challenging problems in automotive industry during the production of these materials is to control the mold shrinkage of TPOs since the parts having very high aspect ratio such as bumper, exterior trims, glass run channel are produced by those materials. Therefore, this paper intends to produce TPO formulations with minimum mold shrinkage by focusing on to optimize the mechanical properties. For that purpose, TPO formulations were prepared by melt blending of plastomers having different physical/mechanical properties into a polyolefin phase. The relationship between structure of plastomer and the function of final product TPO was tried to be explained by structural characterization and molecular dynamic (MD) simulations. In terms of mold shrinkage values and mechanical properties the optimum TPO compound is found to be “sample A” containing 70% plastomer with medium crystallinity and 30% copolymer PP. It shows low mold shrinkage values in parallel (0,19%) and perpendicular (0,2%) to flow direction and optimum tensile strength (13,4 MPa), tear strength (74,4N/mm) and elongation at break (815%) results. Findings of this study is useful in understanding the micro-events taking place during compound process of PP with plastomers, and to explain the necessary PP-plastomer ratio with desired mechanical traits.



中文翻译:

用于生产低模具收缩热塑性烯烃的塑性体的结构-形态-功能关系研究

热塑性聚烯烃 (TPO) 是汽车工业中最常用的聚合物材料之一,因为与商业聚烯烃相比,它们具有更好的弹性。热塑性聚烯烃 (TPO) 或烯烃热塑性弹性体是通过将聚烯烃(通常为共聚物聚丙烯)和塑性体按一定比例混合以改善弹性体性能而制备的。在这些材料的生产过程中,汽车行业最具挑战性的问题之一是控制 TPO 的模具收缩率,因为具有非常高纵横比的零件,例如保险杠、外饰、玻璃导槽都是由这些材料生产的。因此,本文旨在通过重点优化机械性能来生产具有最小模具收缩率的 TPO 配方。为了这个目的,通过将具有不同物理/机械性能的塑性体熔融共混到聚烯烃相中来制备 TPO 制剂。试图通过结构表征和分子动力学 (MD) 模拟来解释塑性体结构与最终产品 TPO 功能之间的关系。就模具收缩值和机械性能而言,发现最佳 TPO 化合物是“样品 A”,其中含有 70% 具有中等结晶度的塑性体和 30% 的共聚物 PP。它在平行 (0.19%) 和垂直 (0.2%) 流动方向和最佳拉伸强度 (13.4 MPa)、撕裂强度 (74.4N/mm) 和断裂伸长率 ( 815%) 结果。本研究的结果有助于理解PP与塑性体复合过程中发生的微事件,

更新日期:2021-09-15
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