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Glass Transition and Molecular Dynamics in Polystyrene Nanospheres by Fast Scanning Calorimetry

机译:快速扫描量热法测定聚苯乙烯纳米球中的玻璃转变和分子动力学

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摘要

We employ fast scanning calorimetry (FSC) to characterize the glass transition of polystyrene (PS) nanospheres. We observe suppression of the glass transition temperature (Tg) in comparison to bulk PS, both in terms of limiting fictive temperature (Tf) and temperature range of vitrification. At the same time, the polymer molecular mobility is found to be independent of the nanospheres diameter and bulk-like. Importantly, apart from the fact that this result has been obtained on the same samples and experiments and at comparable time scales, in all cases, a perturbation of the entropy is induced. Hence, to understand these results, the conceptual difference between vitrification kinetics and molecular mobility is highlighted. The main consequence of the outcome of the present study is that arguments beyond those based on the modification of the molecular mobility must be accounted for to explain Tg suppression in polymer glasses subjected to nanoscale confinement.]]>
机译:<![cdata [ src ='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/amlccd/2017/amlccd.2017.6.issue-8/acsmacrolett.7b00484/20170809/图像/中/ MZ-2017-00484M_0005.gif“>我们采用快速扫描量热(FSC)来表征聚苯乙烯(PS)纳米球的玻璃化转变。与批量PS相比,我们观察抑制玻璃化转变温度( T <亚> g ),无论是限制虚拟温度( t F )和玻璃化温度范围。同时,发现聚合物的分子迁移率与纳米球直径和散装状无关。重要的是,除了在相同的样本和实验中获得该结果以及在相当的时间尺度上获得该结果,在所有情况下,诱导熵的扰动。因此,要理解这些结果,突出了玻璃化动力学和分子迁移率之间的概念差异。本研究结果的主要结果是,必须考虑基于分子迁移率的修饰的争论以解释经受聚合物玻璃中的 T

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  • 来源
    《ACS Macro Letters》 |2017年第8期|共5页
  • 作者单位

    Centro de Física de Materiales CFM (CSIC-UPV/EHU) and Materials Physics Center MPC Paseo Manuel de Lardizabal 5 20018 San Sebastián Spain;

    Department of Chemistry Università degli Studi di Roma “la Sapienza” Piazzale Aldo Moro 5 00185 Rome Italy;

    Centro de Física de Materiales CFM (CSIC-UPV/EHU) and Materials Physics Center MPC Paseo Manuel de Lardizabal 5 20018 San Sebastián Spain;

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  • 正文语种 eng
  • 中图分类 有机化学;
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