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How Tethered Probes Report the Dynamics of a Polymer near the Glass Transition

机译：系列探头如何报告玻璃过渡附近聚合物的动态

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摘要

How tethered probes report dynamics of host polymers near the glass transition was investigated by changing the length of the flexible linkers and the number of tethering points via imaging rotational fluorescence correlation microscopy and compared with free probes of different sizes. The results show that tethering did not alter the temperature-dependence of polymer dynamics and the shape of the correlation decay reported by the probe; however, the rotation slowed down up to nil decade when both ends of the probe were restricted with short alkyl chain linkers. Upon comparison with the bigger free probe, the mechanism of the slowdown was attributed to the restricted motion upon tethering for tethered probes compared to averaging over different regions of the dynamic heterogeneity for the bigger probe. If the size of the probe was comparable to that of the dynamic heterogeneity of the system, tethered probes accurately report dynamics relevant to glass transition, regardless of tethering conditions.
机译：通过成像旋转荧光相关显微镜和不同尺寸的自由探针相比，通过改变柔性接头和束缚点的数量来研究如何研究玻璃转变附近的玻璃化转变附近的宿主聚合物的动态。结果表明，束缚未改变聚合物动力学的温度依赖性，探针报告的相关衰减的形状;然而，当探针的两端限制用短的烷基链接头限制时，旋转减慢了十年。与更大的自由探针相比，减速机制归因于与较大探针的动态异质性的不同区域的平均相比，缩小的限制运动被束缚探针相比。如果探针的尺寸与系统的动态异质性相当，则无论系束性条件如何，彼待探头准确地报告与玻璃过渡相关的动态。

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  • 来源
    《ACS Macro Letters》 |2019年第9期|共6页
  • 作者

    Choi Jiwon; Lee Soohyun; Choe Jongwon; Chung Yura; Lee Yae Eun; Kim Jisu; Kim Myungwoong; Paeng Keewook;

  • 作者单位

    Sungkyunkwan Univ Dept Chem Suwon 16419 South Korea;

    Sungkyunkwan Univ Dept Chem Suwon 16419 South Korea;

    Inha Univ Dept Chem &

    Chem Engn Incheon 22212 South Korea;

    Sungkyunkwan Univ Dept Chem Suwon 16419 South Korea;

    Sungkyunkwan Univ Dept Chem Suwon 16419 South Korea;

    Inha Univ Dept Chem &

    Chem Engn Incheon 22212 South Korea;

    Inha Univ Dept Chem &

    Chem Engn Incheon 22212 South Korea;

    Sungkyunkwan Univ Dept Chem Suwon 16419 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
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