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首页> 外文期刊>Journal of Polymers and the Environment >Effect of Natural and Accelerated Aging on the Mechanical Performance of a Composite Based on Recycled Multilayer Carton
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Effect of Natural and Accelerated Aging on the Mechanical Performance of a Composite Based on Recycled Multilayer Carton

机译：自然和加速老化对再生多层纸箱复合材料力学性能的影响

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摘要

A composite elaborated from waste material was studied for its proposed use as a wood plastic composite. Multilayer food cartons and recycled high density polyethylene were used for the elaboration of laminates, in a proportion of 55% and 45% volume fraction, respectively. The samples were subjected to an aging in an accelerated weathering (AW) chamber for 0, 500, 1000 and 2000 h with UVB radiation, temperature and humidity cycles. Samples exposed to natural weathering (NW) for 0, 1300, 2600 and 5200 h, in a warm sub-humid environment were also studied, the aim being to elucidate a correlation of the useful lifespan of the material. In both cases, after the exposure, three-point bend tests were performed to evaluate the effect on the mechanical properties. The analysis of the degradation process was carried out by infrared spectroscopy, indicating that the AW and NW samples showed deterioration of the material in different proportions. By mean of thermal analysis, it was possible to associate the degradation with the appearance and/or growth of the endothermic peaks, showing a variation in the melting temperature as the time of exposure to AW and NW increased, resulting in a change in the crystallinity percentage. The modulus of rupture (MOR) and the flexural modulus of elasticity decreased by 20% in samples subjected to AW for 2000 h; while in the samples exposed to NW, required of 5200 h to obtain a reduction of 16% in the MOR.
机译：对由废料制成的复合材料进行了研究，拟将其用作木塑复合材料。多层食品纸箱和回收的高密度聚乙烯分别用于制作层压板，其体积分数分别为55％和45％。样品在UVB辐射，温度和湿度循环下，在加速老化（AW）室中老化0、500、1000和2000 h。还研究了在温暖的半湿润环境下暴露于自然风化（NW）下0、1300、2600和5200 h的样品，目的是阐明材料使用寿命的相关性。在这两种情况下，暴露后均进行了三点弯曲测试，以评估其对机械性能的影响。降解过程的分析是通过红外光谱进行的，表明AW和NW样品显示了不同比例的材料劣化。通过热分析，可以将降解与吸热峰的出现和/或生长相关联，表明随着暴露于AW和NW的时间增加，熔融温度会发生变化，从而导致结晶度变化百分比。 AW持续2000 h的样品的断裂模量（MOR）和弯曲弹性模量降低了20％。而在暴露于西北的样品中，需要5200小时才能使MOR降低16％。

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