• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS Macro Letters >Role of Alicyclic Conformation-Isomerization in the Photomechanical Performance of Azobenzene-Functionalized Cross-Linked Polyimides Containing Tetra-Substituted Cyclohexane Moieties
【24h】

Role of Alicyclic Conformation-Isomerization in the Photomechanical Performance of Azobenzene-Functionalized Cross-Linked Polyimides Containing Tetra-Substituted Cyclohexane Moieties

机译：脂环化构象 - 异构化在含四取代环己烷部分的偶氮官能化交联聚酰亚胺的光学力学性能中的作用

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 classical “chair-twist boat–boat” conformational dynamics (CD) of cyclohexane is thermally activated. Here we report on the photoinduced/azobenzene-assisted CD of bilaterally fused cyclohexane moieties contributing to large photomechanical response of cross-linked azobenzene-functionalized polyimides (X-azoPI), based on 1,2,4,5-cyclohexane-tetracarboxylic-dianhydride (CHDA), exhibiting a photobending angle and photogenerated stress, up to ～90° and 370 kPa, respectively. In contrast, X-azoPI containing planar pyromellitimide (PMDI) or cage-like bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic-diimide (BCDI) show smaller photomechanical responses. The superior photomechanical performance of X-azoPI with constrained cyclohexane-diimide (CHDI) units is attributed to an increased mobility of segments comprising “hinged” p-phenylene rings, azobenzene, and CHDI units in the cross-link sites. Blue light irradiation initiates the motions driven by photoisomerization/reorientation of azobenzenes connected to CHDI units, whose CD is then amplified, leading to longer-range segmental mobility, more local free volume, and culminating in large photoinduced bending. The trapping of redistributed CHDI’s stereoisomers in X-azoPI backbone at T _(room) is implicated for the observed photothermal memory.
机译：None

著录项

  • 来源
    《ACS Macro Letters》 |2021年第2期|共6页
  • 作者

    David H. Wang; Kyung Min Lee; Deborah H. Lee; Matthew Baczkowski; Hajin Park; Michael E. McConney; Loon-Seng Tan;

  • 作者单位

    Air Force Research Laboratory Functional Materials Division (AFRL/RXA) Materials and Manufacturing Directorate Wright-Patterson Air Force Base;

    Air Force Research Laboratory Functional Materials Division (AFRL/RXA) Materials and Manufacturing Directorate Wright-Patterson Air Force Base;

    Air Force Research Laboratory Functional Materials Division (AFRL/RXA) Materials and Manufacturing Directorate Wright-Patterson Air Force Base;

    Air Force Research Laboratory Functional Materials Division (AFRL/RXA) Materials and Manufacturing Directorate Wright-Patterson Air Force Base;

    Air Force Research Laboratory Functional Materials Division (AFRL/RXA) Materials and Manufacturing Directorate Wright-Patterson Air Force Base;

    Air Force Research Laboratory Functional Materials Division (AFRL/RXA) Materials and Manufacturing Directorate Wright-Patterson Air Force Base;

    Air Force Research Laboratory Functional Materials Division (AFRL/RXA) Materials and Manufacturing Directorate Wright-Patterson Air Force Base;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
  • 关键词

相似文献

  • 外文文献
  • 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