• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Evaluating UV/H_2O_2 Exposure as a DEHP Degradation Treatment for Plasticized PVC
【24h】

Evaluating UV/H_2O_2 Exposure as a DEHP Degradation Treatment for Plasticized PVC

机译：评价UV / H_2O_2暴露作为增塑PVC的DEHP降解处理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Millions of tons of plasticized poly(vinyl chloride) (PVC) materials are disposed every year. A biologically sustainable and green method for removal of toxic plasticizers from polymer systems after disposal is highly desired since plasticizers can leach out into the environment over decades. Here we compare the surface and bulk structural changes of DEHP-plasticized PVC after two treatments intended to degrade bis-2-ethylhexyl phthalate (DEHP) in PVC plastic: short wave (254 nm) UV with and without the addition of 35 wt % H_2O_2. Sum frequency generation vibrational spectroscopy (SFG) reveals the addition of aqueous H_2O_2 decreases CH_3 signals on the surface of the films up to 8 h, due to increased molecular disorder and the removal of alkyl chains. Secondary ion mass spectrometry demonstrates that the degradation of DEHP after 8 h of reaction is similar with and without the use of H_2O_2. However, FTIR results reveal that the introduction of H_2O_2 reduces bulk DEHP degradation and leads to competing radical chain scission reactions with PVC. Therefore, simple short wave UV exposure may be an effective means to degrade DEHP within and on PVC plastic and the addition of H_2O_2 is only beneficial if additional degradation of PVC is needed.
机译：每年要处置数百万吨的增塑聚氯乙烯（PVC）材料。由于增塑剂可在数十年内浸出到环境中，因此，迫切需要一种在生物学上可持续且绿色的方法，以从聚合物体系中去除有毒的增塑剂。在这里，我们比较了两种旨在降解PVC塑料中邻苯二甲酸双-2-乙基己基酯（DEHP）的处理后，DEHP增塑PVC的表面和整体结构变化：短波（254 nm）UV，添加和不添加35 wt％H_2O_2 。总和频率产生振动光谱法（SFG）揭示，由于分子无序性增加和烷基链的去除，H_2O_2水溶液的添加最多可在8 h内降低膜表面CH_3信号。二次离子质谱法表明，在有和没有使用H_2O_2的情况下，反应8小时后，DEHP的降解都相似。然而，FTIR结果表明，H_2O_2的引入减少了DEHP的整体降解，并导致与PVC竞争的自由基断链反应。因此，简单的短波紫外线暴露可能是降解PVC塑料内部和表面上的DEHP的有效方法，仅在需要进一步降解PVC的情况下，添加H_2O_2才是有益的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号