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首页> 外文期刊>Journal of Applied Polymer Science >Photo-oxidation of Polystyrene/Clay Nanocomposites Under Accelerated UV Exposure: Effect on the Structure and Molecular Weight
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Photo-oxidation of Polystyrene/Clay Nanocomposites Under Accelerated UV Exposure: Effect on the Structure and Molecular Weight

机译：加速紫外线照射下聚苯乙烯/粘土纳米复合材料的光氧化作用：对结构和分子量的影响

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摘要

The present work investigates the effects of photo-oxidation under accelerated UV conditions on the structure, the molecular weight and the morphology of polystyrene (PS)/organophilic montmorillonite (OMMT) at various clay contents: 2.5, 5, and 7 wt %. Fourier transform infrared spectroscopy, viscosimetry and scanning electron microscopy were used to evaluate the extent of degradation of nanocomposite samples in comparison with neat PS, up to 216 h of exposure. The study has shown that the formation rates of both carbonyl and hydroperoxide groups increase with exposure time, being much higher for PS/OMMT nanocomposites. Moreover, it is also observed that all samples exhibit a large increase in the scission index, however less pronounced for neat PS. These results clearly indicate the formation of low molecular weight products that could arise from chain scission. Further, the photo-oxidation rate seems to be more affected by the presence of clay, which acts as a catalyst, rather than by the variation of clay contents. Finally, the degraded materials exhibit eroded surface.
机译：本工作研究了在不同的粘土含量（2.5、5和7 wt％）下，加速紫外线条件下光氧化对聚苯乙烯（PS）/亲有机蒙脱土（OMMT）的结构，分子量和形态的影响。与纯PS相比，在长达216 h的暴露时间中，使用傅立叶变换红外光谱法，粘度测定法和扫描电子显微镜来评估纳米复合材料样品的降解程度。研究表明，羰基和氢过氧化物基团的形成速率均随着暴露时间的增加而增加，而PS / OMMT纳米复合材料的形成速率要高得多。此外，还观察到所有样品均显示出断裂指数的大幅增加，但是对于纯净PS来说却不太明显。这些结果清楚地表明，可能由于断链而形成了低分子量产物。此外，光氧化速率似乎更多地受到作为催化剂的粘土的存在的影响，而不是受到粘土含量的变化的影响。最后，降解的材料显示出腐蚀的表面。

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