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首页> 外文期刊>Journal of Applied Polymer Science >PHOTODEGRADATION OF POLYPROPYLENE CONTAINING A NUCLEATING AGENT
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PHOTODEGRADATION OF POLYPROPYLENE CONTAINING A NUCLEATING AGENT

机译：含核试剂的聚丙烯的光分解

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The effect of including 0.5 wt % talc on the photodegradation behavior of polypropylene( PP) was investigated in injection-molded samples exposed to ultraviolet radiation (UV) in the laboratory for periods of up to 24 weeks. The structure of the talc-nucleated samples was characterized by X-ray diffraction and light microscopy and compared with that of nonnucleated PP, and the information was used to explain the differences in their photodegradation behavior. Measurements of the extent of chemical degradation were made by Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography( GPC), and they showed that there is no significant effect of a nucleating agent on the kinetics of photooxidation. PP bars containing a nucleating agent showed a larger reduction in mechanical properties with UV exposure and a partial recovery in properties after prolonged exposure was observed with both types of samples. An increase in crystallinity during UV exposure (chemicrystallization) was detected by X-ray diffraction and differential scanning calorimetry (DSC) and the dependence with exposure time was similar in nucleated and nonnucleated samples. DSC was also used to determine the melting behavior and transition temperatures of the specimens during exposure and after recrystallization from the melt. (C) 1997 John Wiley & Sons, Inc. [References: 61]
机译：在长达24周的实验室中，在暴露于紫外线（UV）的注塑成型样品中研究了添加0.5 wt％滑石粉对聚丙烯（PP）光降解行为的影响。用X射线衍射和光学显微镜对滑石成核样品的结构进行了表征，并与无核PP进行了比较，该信息可用来解释其光降解行为的差异。化学降解程度的测量是通过傅里叶变换红外光谱（FTIR）和凝胶渗透色谱（GPC）进行的，结果表明成核剂对光氧化动力学没有显着影响。包含成核剂的PP试条在暴露于紫外线的情况下显示出较大的机械性能下降，并且在两种类型的样品中都观察到长时间的暴露后，部分恢复了性能。通过X射线衍射和差示扫描量热法（DSC）检测到UV暴露（化学结晶）过程中结晶度的增加，并且在有核和无核样品中，对暴露时间的依赖性相似。 DSC还用于确定样品在暴露过程中以及从熔体中重结晶后的熔融行为和转变温度。 （C）1997 John Wiley＆Sons，Inc. [参考：61]

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