The impact of glycol water exposure on PA6/GF30 properties

IF 3.6 4区材料科学 Q2 MATERIALS SCIENCE, COMPOSITES

Journal of Thermoplastic Composite Materials Pub Date : 2024-08-14 DOI:10.1177/08927057241274346

Imen Ksouri, Olivier De Almeida, Nader Haddar

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引用次数: 0

Abstract

The current paper aims to study the behavior of Polyamide 6 (PA6) and Polyamide 6 reinforced with 30% of short glass fibers (PA6GF30) under glycol water (GW) mixture used for cars as coolant fluid. Samples were fully immersed in the mixture of GW (20:80) at 50°C, 70°C and 90°C for up to 80 days and periodically weighted. Results gathered revealed the occurrence of substantial changes especially for PA6 samples aged at 90°C. The long term ageing leads to the formation of ester species due to thermo-oxidation as pointed out by Infrared spectroscopy analysis. Moreover, dynamic mechanical analysis measurements showed that glycol water acted as an effective plasticizer in lowering the Tg of the polyamide 6. This plasticizer effect was confirmed by the gain of ductility at early stage of ageing for both materials (PA6 and PA6GF30). Nevertheless, after 80 days of ageing the effect of glycol water ageing is no longer physical in nature and an overall loss of mechanical properties was noticed. Indeed, an embrittlement of PA6 was measured that can be attributed to a decrease of the level of entanglements within the polymer. Nevertheless, for PA6GF30 material, the loss of strength and stiffness was the result of the interfacial debonding between the fibers and the matrix.

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乙二醇水暴露对 PA6/GF30 性能的影响

本文旨在研究聚酰胺 6（PA6）和 30% 短玻璃纤维增强聚酰胺 6（PA6GF30）在乙二醇水（GW）混合物（用作汽车冷却液）中的行为。将样品完全浸入 50°C、70°C 和 90°C 的 GW（20:80）混合物中长达 80 天，并定期称重。收集的结果表明，尤其是在 90°C 老化的 PA6 样品发生了很大的变化。红外光谱分析显示，长期老化会导致热氧化形成酯类物质。此外，动态机械分析测量结果表明，乙二醇水是一种有效的增塑剂，可降低聚酰胺 6 的 Tg。两种材料（PA6 和 PA6GF30）在老化初期的延展性增加证实了这种增塑作用。然而，经过 80 天的老化后，乙二醇水老化的影响不再是物理性的，而是机械性能的整体损失。事实上，PA6 材料的脆化现象可归因于聚合物内部缠结程度的降低。然而，对于 PA6GF30 材料来说，强度和刚度的损失是纤维与基体之间界面脱粘的结果。

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

Journal of Thermoplastic Composite Materials 工程技术-材料科学：复合

CiteScore

8.00

自引率

18.20%

发文量

104

审稿时长

5.9 months

期刊介绍： The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).