Foaming Mechanism of Polypropylene in Gas-Assisted Microcellular Injection Molding,Industrial & Engineering Chemistry Research

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Foaming Mechanism of Polypropylene in Gas-Assisted Microcellular Injection Molding
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-03-22 00:00:00 , DOI: 10.1021/acs.iecr.7b05389
Junji Hou ₁ , Guoqun Zhao ₁ , Lei Zhang ₁ , Guiwei Dong ₁ , Guilong Wang ₁

Affiliation

In our recent study, it is reported that gas-assisted microcellular injection molding (GAMIM) is a promising method to fabricate plastic foams with good surface quality, high weight reduction, and improved mechanical performance. To clarify the foaming mechanism, the crystallization behaviors of polypropylene in both conventional injection molding (CIM) and gas-assisted injection molding (GAIM) were studied. It is found that GAIM can significantly promote melt crystallization and refine crystals. To explore the improvement mechanism of crystallization, a numerical model was developed to simulate the filling and cooling processes of CIM and GAIM. The simulation results show that the much stronger shear field and the faster cooling rate lead to the refinement of crystals in GAIM. Finally, a crystallization-driven cell nucleation model was proposed to explain the improved foaming behavior of polypropylene in GAMIM. This paper provides a deep understanding of the foaming behavior and hence benefits the foaming process design.

中文翻译：

气体辅助微孔注射成型中聚丙烯的发泡机理

在我们最近的研究中，据报道，气体辅助微孔注射成型（GAMIM）是一种具有良好表面质量，降低重量和改善机械性能的有前景的制造塑料泡沫的方法。为了阐明起泡机理，研究了聚丙烯在常规注射成型（CIM）和气体辅助注射成型（GAIM）中的结晶行为。发现GAIM可以显着促进熔体结晶并细化晶体。为了探索改善结晶的机理，建立了一个数值模型来模拟CIM和GAIM的填充和冷却过程。仿真结果表明，更强的剪切场和更快的冷却速度导致了GAIM中晶体的细化。最后，提出了结晶驱动的细胞成核模型，以解释聚丙烯在GAMIM中改善的起泡行为。本文提供了对发泡行为的深刻理解，因此有益于发泡工艺设计。

更新日期：2018-03-22

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