Confinement-Induced Deviation of Chain Mobility and Glass Transition Temperature for Polystyrene/Au Nanoparticles

Confinement-Induced Deviation of Chain Mobility and Glass Transition Temperature for Polystyrene/Au Nanoparticles
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聚苯乙烯/金纳米颗粒的约束引起的链迁移率和玻璃化转变温度的偏差

DOI:
10.1021/ma302643y
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发表时间:
2013-03
期刊:
影响因子:
5.5
通讯作者:
Xue, Gi
Xue, Gi
中科院分区:
化学1区
文献类型:
--
作者:
Gu, Qiang;Chen, Wei;Sun, Pingchuan;Xue, Gi

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在纳米级限制下的聚合物的迁移率和玻璃化转变温度(Tg)与本体基本上不同。虽然许多研究都集中在一维的限制,它具有重要的意义,将研究扩展到更高的几何。在这里,我们系统地研究了流动性的偶极滤波器序列在固态NMR和Tg的DSC的巯基化聚苯乙烯(PS-SH)的金纳米粒子。在Tg和NMR谱中的信号抑制的增加清楚地表明,表面限制占主导地位的分子的流动性以及Tg。PS-SH的分子量和纳米粒子的尺寸对固定化和玻璃化转变温度有显著影响。我们的结果可以用核-两壳模型来拟合,内壳受到强约束,而外壳受到较少的约束。这项工作对于更好地理解限制效应至关重要,也为最终实现定制纳米材料性能的愿望迈出了一步。
The mobility and glass transition temperature (Tg) for polymers under nanoscale confinement differ substantially from the bulk. Whereas many studies have focused on the one-dimensional confinement, it has great significance to extend studies to higher geometries. Here, we systematically investigate the mobility by dipolar-filter sequence in solid-state NMR and Tg by DSC for thiolated polystyrene (PS-SH) on gold nanoparticles. The increase in Tg and signal suppression in NMR spectra clearly indicate that the surface confinement dominates molecular mobility as well as Tg. The molecular weight of PS-SH and nanoparticles size show significant influence on the immobilization and Tg. Our results can be fitted with a core–two shell model; the inner shell is under strong constraints while the outer shell with less confinement. This work is essential to better understand the confinement effect and also provides a step toward the ultimate desire to tailor the properties of nanomaterials.
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