Polyrotaxane Glass: Peculiar Mechanics Attributable to the Isolated Dynamics of Different Components.
Polyrotaxane Glass: Peculiar Mechanics Attributable to the Isolated Dynamics of Different Components.
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聚轮烷玻璃：归因于不同组件的孤立动力学的特殊力学。
DOI：
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发表时间：
2015
影响因子：
5.7
通讯作者：
K. Ito
中科院分区：
文献类型：
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作者：
Kazuaki Kato;Tomo Mizusawa;Hideaki Yokoyama;K. Ito
缩合聚合物的分子动力学直接关系到实际上重要的机械性能，如玻璃化转变行为和冲击强度。我们提出了一种独特的粘弹性玻璃形成聚轮烷，是由主链聚合物和螺纹环糊精。异常宽的玻璃化转变相归因于链段运动，这是前所未有的不易受到与相邻链的合作运动，直到玻璃化完成。即使在玻璃态下，其中占据材料的>80重量%的环状组分被玻璃化，主链聚合物在玻璃状多孔框架内保持高流动性。聚合物链的异常流动性导致强烈的亚弛豫，使弹性模量改变约3倍。这些结果表明，独特的动力学和力学归因于不同组分之间的松散相关性，这表明基于机械互锁聚合物的分子设计可能产生前所未有的机械性能。
The molecular dynamics of condensed polymers are directly linked to practically important mechanical properties, such as glass transition behavior and impact strength. We present a unique viscoelastic glass-forming polyrotaxane that is comprised of a main chain polymer and threaded cyclodextrins. The abnormally broad glass transition phase is attributed to the segment motion, which is unprecedentedly insusceptible to cooperative motion with neighboring chains until vitrification is completed. Even in the glass state, in which the cyclic components, occupying >80 wt % of the material, are vitrified, the main chain polymer retains high mobility within the glassy porous framework. The anomalous mobility of the polymer chains causes strong subrelaxation that changed the elastic modulus about 3-fold. These results demonstrate that the unique dynamics and mechanics are attributable to the loose correlation between different components, suggesting the possible creation of unprecedented mechanical properties based on the molecular design of mechanically interlocked polymers.