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首页> 外文期刊>Journal of Applied Polymer Science >Natural weathering of polypropylene films. II. Ultimate properties and exposure time
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Natural weathering of polypropylene films. II. Ultimate properties and exposure time

机译：聚丙烯薄膜的自然风化。二。极限性能和曝光时间

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摘要

Changes in the ultimate properties brought about by outdoor weathering during the rainy season of polypropylene (PP) films were studied. The results obtained showed that the draw ratio hd, tensile stress ab, breaking ratio lambda(b), breaking factor (BF), work draw U-d, and work for rupture U-r all increased with increase in outdoor exposure time, attaining a maximum at about 240-h exposure time, before decreasing with further increases in exposure time. On the other hand, the draw ratio delta(s) remained practically constant up to about 100-h exposure time. The changes in the former set of properties were corroborated by the changes in the apparent crystallinity of the PP samples. In addition, it was shown that a 504-h exposure time was not enough to reduce the properties to damaging levels. (C) 1998 John Wiley & Sons, Inc. [References: 21]
机译：研究了聚丙烯（PP）薄膜在雨季期间室外风化带来的最终性能变化。所得结果表明，拉伸比hd，拉伸应力ab，断裂比λ（b），断裂因数（BF），功拉伸Ud和断裂Ur均随着户外暴露时间的增加而增加，在约120℃达到最大值。 240小时的曝光时间，然后随着曝光时间的进一步增加而减少。另一方面，在约100小时的暴露时间下，拉伸比Δ实际上保持恒定。 PP样品表观结晶度的变化证实了前一组性能的变化。另外，已经表明504小时的暴露时间不足以将性能降低到破坏水平。 （C）1998 John Wiley＆Sons，Inc. [参考：21]

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