Study on wall-slipping mechanism of nano-injection polymer under the constant temperature fields

IF 3.2 3区化学 Q2 POLYMER SCIENCE

e-Polymers Pub Date : 2023-01-01 DOI:10.1515/epoly-2023-0085

Donglei Liu, Riqing Chen, Kai Zhan, Zizhi Chen, Xin Luo

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Abstract

Abstract Polyphenylene sulfide (PPS) and copper (Cu) were used as the polymer and substrate material to simulate the nano-injection molding process by molecular dynamics method. The results show that the PPS chain obeys Einstein’s diffusion law in the early stage of injection molding then deviates from it in the late stage due to the entanglement and limitation of surrounding nanoparticles. In addition, the process of conformational isomerization of polymer chains is accompanied by the twisting and stretching of fixed chains. There are two kinds of adhesion phenomena, one is the macromolecular slides violently in small areas of some sure nanoscale groove to form multiple anchor points. The other case involves multiple nano-grooves along the metal interface, the polymer chain slides and is bolted as multiple anchors in different grooves due to the exerted wall-drag effect on the neighboring chains. These two slipping and anchoring mechanisms are consistent with de Gennes’ slipping theory. Through the quantitative analysis of the influence of pressure on injection filling, it is found that injection pressure should be kept within a certain range to achieve the positive effect of molding.

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恒温场下纳米注入聚合物的滑壁机理研究

摘要以聚苯硫醚(PPS)和铜(Cu)为基材，采用分子动力学方法模拟纳米注射成型过程。结果表明:PPS链在注射成型初期服从爱因斯坦扩散定律，在注射成型后期由于周围纳米粒子的纠缠和限制而偏离爱因斯坦扩散定律;此外，聚合物链的构象异构化过程伴随着固定链的扭曲和拉伸。黏附现象主要有两种，一种是大分子在某些特定纳米级沟槽的小区域内剧烈滑动，形成多个锚点。在另一种情况下，聚合物链沿着金属界面形成多个纳米凹槽，由于施加在相邻链上的壁阻效应，聚合物链在不同的凹槽中滑动并作为多个锚固定。这两种滑移和锚定机制与德热纳的滑移理论是一致的。通过定量分析压力对注射填充的影响，发现注射压力应保持在一定范围内，以达到成型的积极效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

e-Polymers 化学-高分子科学

CiteScore

5.90

自引率

10.80%

发文量

审稿时长

6.4 months

期刊介绍： e-Polymers is a strictly peer-reviewed scientific journal. The aim of e-Polymers is to publish pure and applied polymer-science-related original research articles, reviews, and feature articles. It includes synthetic methodologies, characterization, and processing techniques for polymer materials. Reports on interdisciplinary polymer science and on applications of polymers in all areas are welcome. The present Editors-in-Chief would like to thank the authors, the reviewers, the editorial staff, the advisory board, and the supporting organization that made e-Polymers a successful and sustainable scientific journal of the polymer community. The Editors of e-Polymers feel very much engaged to provide best publishing services at the highest possible level.