...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Molecular-Scale Understanding of the Embrittlement in Polyethylene Ocean Debris
【24h】

Molecular-Scale Understanding of the Embrittlement in Polyethylene Ocean Debris

机译：聚乙烯海洋碎片中脆化的分子规模了解

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

The fate of plastic waste is a pressing issue since it forms a visible and long-lived reminder of the environmental impact of consumer habits. In this study, we examine the structural changes in the lamellar arrangements of semicrystalline polyethylene (PE) packaging waste with the aim of understanding the physical mechanisms of embrittlement in PE exposed to the marine environment. PE microplastics and macroplastics from identifiable PE packaging were collected in the Atlantic Ocean and compared to new PE boxes. Several experimental techniques interrogate the effects of environmental exposure on their bulk and surface properties. Size exclusion chromatography determines the molecular weight distribution of the PE polymer chains and differential scanning calorimetry gives the crystallinity. Small- and wide-angle X-ray scattering examines the packing of PE chains into semicrystalline lamellae. Longitudinal acoustic mode Raman spectroscopy provides a complementary measurement of the length of PE polymer chains extending through the crystalline lamellar domains. While there is a high degree of uncertainty in the time scale for the changes, the overall picture at the molecular scale is that although PE becomes more crystalline with environmental exposure, the lamellar order present in new packing boxes is disrupted by the weathering process. This process has important implications for embrittlement and subsequent degradation.
机译：塑料废物的命运是一种压迫问题，因为它形成了消费习惯的环境影响的可见和长期提醒。在这项研究中，我们研究了半结晶聚乙烯（PE）包装废物的层状布置的结构变化，目的是理解暴露于海洋环境的PE的脆化物理机制。来自识别PE包装的PE微塑料和宏观体塑料在大西洋收集，与新的PE盒相比。几种实验技术询问了环境暴露对散装和表面特性的影响。尺寸排阻色谱法确定PE聚合物链和差示扫描量热法的分子量分布给出结晶度。小型和广角X射线散射检查PE链包装成半结晶膜。纵向声模式拉曼光谱提供通过结晶层状域延伸的PE聚合物链长度的互补测量。虽然在变化的时间标尺中存在高度的不确定性，但分子尺度的整体图像是尽管PE与环境曝光更结晶，但是在新的包装盒中存在的层状顺序被耐候过程中断。该过程对脆化和随后的降解具有重要意义。

著录项

  • 来源
    《Environmental Science & Technology》 |2020年第18期|11173-11181|共9页
  • 作者

    Christopher J. Garvey; Marianne Imperor-Clerc; Stephan Rouziere; Gwenaeel Gouadec; Olivier Boyron; Laura Rowenczyk; Anne Francoise Mingotaud; Alexandra ter Halle;

  • 作者单位

    Laboratoire de Physique des Solides UMR 8502 CNRS Universit'e Paris Saclay 91400 Orsay France Lund Institute for Advanced Neutron and X-ray Science 223 70 Lund Sweden Biofilm-Research Center for Biointerfaces and Biomedical Science Department Faculty of Health and Society Malmo University 211 19 Malmo Sweden Australian Nuclear Science and Technology Organisation Kirrawee DC NSW 2232 Australia;

    Laboratoire de Physique des Solides UMR 8502 CNRS Universit'e Paris Saclay 91400 Orsay France;

    Laboratoire de Physique des Solides UMR 8502 CNRS Universit'e Paris Saclay 91400 Orsay France;

    Laboratoire MONAR1S Sorbonne Universit'e CNRS 75252 Paris France;

    C2P2-LCPP Group UMR CNRS 5265 Universit'e de Lyon 69616 Villeurbanne France;

    Laboratoire des IMRCP Universit'e de Toulouse CNRS UMR 5623. Universite Paul Sabatier. F-31062 Toulouse France;

    Laboratoire des IMRCP Universite de Toulouse CNRS UMR 5623 Universite Paul Sabatier F-31062 Toulouse France;

    Laboratoire des IMRCP Universit'e de Toulouse CNRS UMR 5623 Universit'e Paul Sabatier F-31062 Toulouse France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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