• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Polymers and the Environment >The Effect of Acetylation on the Hydrolytic Degradation of PLA/Clay Nanocomposites
【24h】

The Effect of Acetylation on the Hydrolytic Degradation of PLA/Clay Nanocomposites

机译：乙酰化对PLA /粘土纳米复合材料水解降解的影响

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

In this study, the hydrolytic degradation of Poly(lactic acid) (PLA) and acetylated PLA (PLA-Ac)-clay nanocomposites were investigated. The organo clay was obtained by ion exchange reaction using cetyl tri methyl ammonium bromide (CTAB). Nanocomposites containing 2, 5 and 8% mass ratio of organo clay (CTAB-O) were prepared. PLA and its organo clay nanocomposites were characterized by scanning electron microscope (SEM), thermo gravimetric analysis (TGA) and X-ray diffraction (XRD) to determine the morphology before and after hydrolytic degradation. Fourier transform infrared (FTIR) analyses of PLA and PLA-Ac were also obtained. The hydrolytic degradation of polymers and their composites were investigated in the phosphate buffered saline solution (PBS). The results showed that controlled hydrolytic degradation was observed in the samples with end group modification of PLA. While weight loss of PLA films was 28%, that of PLA-Ac films was 18% after 60 days degradation time. The weight loss was obtained as 29.5 and 25.5% for PLA-5 wt% organo clay (PLA/5CTAB-O) and PLA-Ac-5 wt% organo clay (PLA-Ac/5CTAB-O) nanocomposites films, respectively. It was also observed that thermal degradation of PLA-Ac was much more than that of PLA. Hydrolytic degradation increased depending on organo clay content. The end group modificated PLA results in controlled hydrolytic degradation. While hydrolytic degradation in polymer films occurred as surface erosion, bulk erosion was observed in composite films.
机译：在这项研究中，聚乳酸（PLA）和乙酰化的PLA（PLA-Ac）粘土纳米复合材料的水解降解进行了研究。使用十六烷基三甲基溴化铵（CTAB）通过离子交换反应获得有机粘土。制备了包含2、5和8％质量比的有机粘土（CTAB-O）的纳米复合材料。通过扫描电子显微镜（SEM），热重分析（TGA）和X射线衍射（XRD）对PLA及其有机粘土纳米复合材料进行表征，以确定水解降解前后的形态。还获得了PLA和PLA-Ac的傅立叶变换红外（FTIR）分析。在磷酸盐缓冲盐溶液（PBS）中研究了聚合物及其复合物的水解降解。结果表明，在端基修饰的PLA样品中观察到受控的水解降解。在降解60天后，PLA薄膜的重量损失为28％，而PLA-Ac薄膜的重量损失为18％。对于PLA-5重量％的有机粘土（PLA / 5CTAB-O）和PLA-Ac-5重量％的有机粘土（PLA-Ac / 5CTAB-O）纳米复合膜，重量损失分别为29.5和25.5％。还观察到，PLA-Ac的热降解远大于PLA。水解降解的增加取决于有机粘土的含量。端基修饰的PLA导致受控的水解降解。尽管聚合物膜的水解降解是表面侵蚀发生的，但复合膜却观察到整体腐蚀。

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