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首页> 外文期刊>Journal of Applied Polymer Science >Thin wall injection-overmoulding of polyamide 6/polypropylene multilayer parts: PA6/PP-g-ma interfacial adhesion investigations
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Thin wall injection-overmoulding of polyamide 6/polypropylene multilayer parts: PA6/PP-g-ma interfacial adhesion investigations

机译：薄壁注射 - 聚酰胺6 /聚丙烯多层部件：PA6 / PP-G-MA界面粘附研究

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摘要

This work investigates the interfacial adhesion of PA6/PP-g-MA in a thin-walled multilayer part obtained by injection overmoulding. This process is a good solution to the need of weight reduction for the sustainable and economic growth of food packaging. A rigid plastic food package is a complex multilayer structure obtained from the association of polymers with different properties to achieve good barrier, environment, or thermo-mechanical performance. The present study aims to obtain a complete understanding of the interfacial adhesion of PA6/PP-g-MA interface in a three-layer PA6/sealant/PP assembly through microscopy analysis, mechanical characterization, and inter-diffusion models. Optical microscopy, XPS, and AFM analyses showed the presence of a copolymer interphase. This layer is greatly dependent on the holding pressure applied, which revealed to be the key parameter to obtain the best results in terms of failure strength. A better interface wettability improves the inter-diffusion distance and thus chemical grafting efficiency. Other interface improvements were achieved by the addition of EVA in the PP-g-MA layer. The lowest viscosity of the EVA dispersed phase has led to a fully cohesive failure due to an interface diffusion efficiency. The presence of EVA increased more than 80% of the peeling performance of the assemblies.
机译：本工作研究了PA6/PP-g-MA在通过注射二次成型获得的薄壁多层零件中的界面粘合。这一过程很好地解决了食品包装可持续经济增长的减重需求。硬质塑料食品包装是一种复杂的多层结构，由具有不同性能的聚合物组合而成，以实现良好的阻隔性、环境或热机械性能。本研究旨在通过显微镜分析、力学表征和相互扩散模型，全面了解三层PA6/密封剂/PP组件中PA6/PP-g-MA界面的界面粘附性。光学显微镜、XPS和AFM分析表明存在共聚物界面。该层在很大程度上取决于施加的保持压力，这是获得最佳破坏强度结果的关键参数。更好的界面润湿性提高了相互扩散距离，从而提高了化学接枝效率。通过在PP-g-MA层中添加EVA，实现了其他界面改善。EVA分散相的最低粘度由于界面扩散效率而导致完全内聚失效。EVA的存在使组件的剥离性能提高了80%以上。

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