• 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 >Degradation of poly(D, L -lactic acid)-b-poly(ethylene glycol) copolymer and poly(L -lactic acid) by electron beam irradiation
【24h】

Degradation of poly(D, L -lactic acid)-b-poly(ethylene glycol) copolymer and poly(L -lactic acid) by electron beam irradiation

机译：电子束辐照降解聚（D，L-乳酸）-b-聚（乙二醇）共聚物和聚（L-乳酸）

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

This article investigated the effects of electron beam (EB) irradiation on poly(D,L-lactic acid)-b-poly(ethylene glycol) copolymer (PLEG) and poly(L-lactic acid) (PLLA). The dominant effect of EB irradiation on both PLEG and PLLA was chain scission. With increasing dose, recombination reactions or partial crosslinking of PLEG can occur in addition to chain scission, but there was no obvious crosslinking for PLLA at doses below 200 kGy. The chain scission degree of irradiated PLEG and PLLA was calculated to be 0.213 and 0.403, respectively. The linear relationships were also established between the decrease in molecular weight with increasing dose. Elongation at break of the irradiated PLEG and PLLA decreased significantly, whereas the tensile strength and glass transition temperature of PLLA decreased much more significantly compared with PLEG. The presence of poly(ethylene glycol) (PEG) chain segment in PLEG was the key factor in its greater stability to EB irradiation compared with PLLA.
机译：本文研究了电子束（EB）辐照对聚（D，L-乳酸）-b-聚（乙二醇）共聚物（PLEG）和聚（L-乳酸）（PLLA）的影响。 EB辐射对PLEG和PLLA的主要影响是断链。随着剂量的增加，除断链外，还可能发生PLEG的重组反应或部分交联，但在低于200 kGy的剂量下PLLA没有明显的交联。辐射的PLEG和PLLA的断链度经计算分别为0.213和0.403。在分子量降低与剂量增加之间也建立了线性关系。与PLEG相比，辐照PLEG和PLLA的断裂伸长率显着降低，而PLLA的拉伸强度和玻璃化转变温度则降低得多。与PLLA相比，PLEG中聚乙二醇链段的存在是其对EB辐射更大稳定性的关键因素。

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