席夫碱作为光稳定剂存在时聚氯乙烯的光稳定效率
Photostabilizing Efficiency of PVC in the Presence of Schiff Bases as Photostabilizers.
作者信息
Yousif Emad, Al-Amiery Ahmed A, Kadihum Abdulhadi, Kadhum Abdul Amir H, Mohamad Abu Bakar
机构信息
Department of Chemistry, College of Science, Al-Nahrain University, Baghdad 10072, Iraq.
Environmental Research Center, University of Technology (UOT), Baghdad 10001, Iraq.
出版信息
Molecules. 2015 Nov 4;20(11):19886-99. doi: 10.3390/molecules201119665.
The photostabilization of polyvinyl chloride (PVC) films by Schiff bases was investigated. Polyvinyl chloride films containing 0.5 wt % Schiff bases were produced using the same casting method as that used for additive-free PVC films from tetrahydrofuran (THF) solvent. The photostabilization activities of these compounds were determined by monitoring the carbonyl, polyene and hydroxyl indices with irradiation time. The changes in viscosity average molecular weight of PVC with irradiation time were also monitored using THF as a solvent. The quantum yield of chain scission (Φcs) for the studied complexes in PVC was estimated to range between 4.72 and 8.99 × 10(-8). According to the experimental results, several mechanisms were suggested, depending on the structure of the additive. Ultra violet (UV) absorption, peroxide decomposition and radical scavenging were suggested as the photostabilizing mechanisms.
研究了席夫碱对聚氯乙烯（PVC）薄膜的光稳定作用。采用与由四氢呋喃（THF）溶剂制备无添加剂PVC薄膜相同的流延法，制备了含有0.5 wt%席夫碱的聚氯乙烯薄膜。通过监测羰基、多烯和羟基指数随辐照时间的变化，测定了这些化合物的光稳定活性。还以THF为溶剂，监测了PVC的粘均分子量随辐照时间的变化。研究的配合物在PVC中的断链量子产率（Φcs）估计在4.72至8.99×10⁻⁸之间。根据实验结果，根据添加剂的结构提出了几种机理。紫外（UV）吸收、过氧化物分解和自由基清除被认为是光稳定机理。
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