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首页> 外文期刊>Journal of Macromolecular Science. Physics >Long-Term Hydrothermal Aging Behavior and Aging Mechanism of Glass Fibre Reinforced Polyamide 6 Composites
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Long-Term Hydrothermal Aging Behavior and Aging Mechanism of Glass Fibre Reinforced Polyamide 6 Composites

机译：玻璃纤维增强聚酰胺6复合材料的长期水热老化行为及老化机理

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摘要

Long-term hydrothermal aging of polyamide 6 (PA6)/glass fibre (GF) composites was conducted and the effects of the GF on variations of structure and properties of the composites with aging time were investigated. It was found that the first stage of aging was a Fickian process and corresponded to the physical absorption of water until equilibrium, resulting in a slight change of reduced viscosity and chemical structure of the PA6. The water diffusing process was slowed down slightly by addition of the GF. The second stage of aging was the initiation process of hydrolytic degradation of PA6, resulting in a rapid decrease of reduced viscosity and an increase of end group content. In the final stage of aging, the relative weight gain (W-r) dropped, the reduced viscosity decreased and the end groups increased slowly. The degradation rate and carbonyl index of PA6 increased with increasing GF content, and the increasing rate of end groups concentration of the composites was higher than that of pure PA6 during the aging process, indicating addition of GF accelerated the hydrolysis degradation and oxidative aging of PA6. In mechanical property tests, compared with unaged samples of the composites which underwent matrix rupture around the matrix-fiber interfacial layer, for aged samples several smooth fibres without coatings were pulled out and the interfacial debonding was the main failure mode, causing severe deterioration in mechanical properties. The hydrolytic degradation activation energy (E-a) was calculated through a method based on the Arrhenius model by considering both temperature and humidity as environment factors; with increasing GF content, E-a decreased, indicating that the addition of GF made PA6 easier to degrade.
机译：进行了聚酰胺6（PA6）/玻璃纤维（GF）复合材料的长期水热老化，并研究了GF对具有老化时间的复合材料的结构和性能变化的影响。结果发现，老化的第一阶段是Fickian工艺，与水平的物理吸收相对应，直至平衡，导致PA6的粘度和化学结构的细微变化。通过添加GF略微减慢水漫射过程。老化的第二阶段是PA6的水解降解的起始过程，导致粘度降低的快速降低和终基含量的增加。在老化的最终阶段，相对重量增益（W-R）掉落，降低的粘度降低，并且端部增加缓慢增加。 PA6的降解率和羰基指数随着GF含量的增加而增加，复合材料的末端浓度的增加速率高于纯PA6期间的纯PA6，表明GF加速了PA6的水解降解和氧化老化。在机械性能测试中，与在基质纤维界面层周围的基质破裂的复合材料的复合材料的复合物的预定样品相比，对于老化的样品，拉出了几种没有涂层的光滑纤维，并且界面剥离是主要的失效模式，导致机械严重劣化特性。通过将温度和湿度视为环境因素，通过基于Arrhenius模型的方法计算水解劣化活化能量（E-A）;随着GF含量的增加，E-A降低，表明GF的添加使PA6更容易降低。

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