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首页> 外文期刊>Journal of Applied Polymer Science >Photodegradation of partially oriented and drawn polypropylene filaments
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Photodegradation of partially oriented and drawn polypropylene filaments

机译：部分取向和拉伸聚丙烯长丝的光降解

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摘要

The effects of fiber structure on the process of photodegradation are controversial in the field. We tested polypropylene fibers of various form for their effects on photodegradation. Fiber grade polypropylene granules were spun into partially oriented multifilament yarns at a spinning speed of 2000 mmin(-1). The yarns were drawn using a draw-twist unit. Yarns were exposed to ultra-violet radiations in a covered open air chamber for different periods of time under two different sources of emissions (UVA; >300 nm and UVC; =254 nm). The samples were examined by Fourier transform infrared spectroscopy, mechanical testing, differential scanning calorimetry, microscopy, and density measurements. In photodegradation process, the drawn filaments had a longer induction time than undrawn ones. The mechanical properties of the undrawn yarns deteriorate faster than the drawn yarns. During the early periods of degradation helical content increases considerably, while the density fluctuates and increases. The degradation rate under UVC radiation was faster than under UVA radiation because of the higher energy of the UVC radiation. The upper photostability of the drawn yarns compared to the undrawn ones was due to the higher crystalline fraction and greater molecular orientation in the drawn yarn. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45716.
机译：纤维结构对光降解过程的影响是该领域的争议。我们测试各种形式的聚丙烯纤维，以便它们对光降解的影响。以2000mmin（-1）的纺丝速度将纤维级聚丙烯颗粒纺成部分取向的多丝纱线（-1）。使用拉伸捻装置绘制纱线。在两个不同的排放来源（UVA; 300nm和UVC; = 254nm）下，在覆盖的露天室中暴露于覆盖的露天室中的紫外线辐射。通过傅里叶变换红外光谱，机械测试，差示扫描量热法，显微镜和密度测量来检查样品。在光致原理中，绘制的丝的诱导时间比未提取的丝较长。未提拉纱线的机械性能比拉伸纱线更快地恶化。在降解螺旋含量的早期期间，较大增加，而密度波动并增加。由于UVC辐射的能量较高，UVC辐射下的降解速率比UVA辐射下降得更快。与未取出的纱线相比，拉伸纱线的上光稳定性是由于较高的晶体馏分和拉伸纱中的更大的分子取向。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45716。

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