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
复制标题
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
中科院分区:
文献类型:
--
作者:
Gu, Qiang;Chen, Wei;Sun, Pingchuan;Xue, Gi
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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DOI:
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发表时间:
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期刊:
ChemInform
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