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首页> 外文期刊>Journal of Applied Polymer Science >The Effect of Depth and Duration of UV Radiation on Polypropylene Modification via Photoinitiation
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The Effect of Depth and Duration of UV Radiation on Polypropylene Modification via Photoinitiation

机译：紫外线辐射的深度和持续时间对光引发聚丙烯改性聚丙烯的影响

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Linear polypropylene (PP) was modified using UV radiation in the presence of 0.5 wt % of benzophenone photoinitiator to introduce long chain branching (LCB) to the PP backbone. Irradiation was carried out in the solid state and the temperature level was kept below 60°C. The effects of radiation duration and sample thickness on the extent of these branching modification reactions were investigated. Viscoelastic properties, molecular weight, molecular weight distribution, and gel content were determined and compared for runs having different sample thicknesses, irradiated for different times. Comparisons were also conducted with the parent PP and the PP mixed with photoinitiator. It was found that LCB decreased by increasing the thickness of the samples. Conversely, an increase in radiation duration resulted in enhanced LCB but also led to larger gel content in the samples. Based on all these measurements and observations, a mechanism was suggested to explain formation of long chain branches (LCBs) in PP in the solid state via photoinitiation. VC 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41021.
机译：在存在0.5重量％的二苯甲酮光引发剂的情况下，使用UV辐射将线性聚丙烯（PP）改性，以将长链支化（LCB）引入PP主链。以固态进行照射，并且将温度水平保持在60℃以下。研究了辐射持续时间和样品厚度对这些支化改性反应程度的影响。测定粘弹性，分子量，分子量分布和凝胶含量，并比较具有不同样品厚度，在不同时间下辐照的运行。还对母体PP和PP与光引发剂混合进行了比较。发现通过增加样品的厚度LCB降低。相反，辐射持续时间的增加导致LCB增强，但也导致样品中的凝胶含量增加。基于所有这些测量和观察，提出了一种机制来解释通过光引发在固态PP中形成长链分支（LCB）。 VC 2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2014，131，41021。

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