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首页> 外文期刊>Journal of Industrial Textiles >Relationship between physical and mechanical properties of accelerated weathering and outdoor weathering of PVC-coated membrane material under tensile stress
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Relationship between physical and mechanical properties of accelerated weathering and outdoor weathering of PVC-coated membrane material under tensile stress

机译：拉伸应力下PVC涂层膜材料的加速老化与室外老化的物理力学性能之间的关系

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摘要

To estimate the photo-oxidation aging performance of PVC-coated membrane material in atmospheric conditions under tensile stresses, the relationship between physical and mechanical properties under accelerated weathering test and outdoor weathering test is studied with the same cumulative UV radiation energy. And then, both tensile strength and whiteness index were measured and compared to characterize the property change of membrane material after aging under four different tensile stresses (0%, 5%, 10% and 20% of the breaking strength), respectively. In addition, FTIR spectrometry was applied to characterize the chemical components of the samples under different weathering conditions, and the carbonyl index was extracted. The results show that there were significant differences of tensile strength and carbonyl index between two kinds of aging conditions, whereas with the increasing tensile stresses, the whiteness index represented a consistent increasing deviation of accelerated weathering from the outdoor weathering. However, the relationship have been built between both whiteness index and tensile strength retention of accelerated weathering and those of outdoor weathering conditions after a Schwarzschild's modification. Therefore, the service lifespan of PVC-coated membrane materials can be evaluated by accelerated weathering tests under tensile stresses.
机译：为了评估PVC薄膜膜材料在大气条件下在拉应力下的光氧化老化性能，在相同的累积紫外线辐射能量下，研究了加速老化试验和室外老化试验下物理和机械性能之间的关系。然后，测量拉伸强度和白度指数，并比较以表征在四种不同拉伸应力（分别为断裂强度的0％，5％，10％和20％）时老化后膜材料的性能变化。此外，采用FTIR光谱法表征了不同风化条件下样品的化学成分，并提取了羰基指数。结果表明，两种老化条件之间的拉伸强度和羰基指数存在显着差异，而随着拉伸应力的增加，白度指数表示加速老化与室外老化之间的偏差不断增大。然而，在Schwarzschild改性后，加速老化和室外老化条件下的白度指数和拉伸强度保持率之间已经建立了关系。因此，可以通过在拉伸应力下的加速耐候性测试来评估PVC涂层膜材料的使用寿命。

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