Suppressed surface dynamics of poly(methyl methacrylate) chains in the corona of collapsed dry micelles tethered by a fluorinated block core
Suppressed surface dynamics of poly(methyl methacrylate) chains in the corona of collapsed dry micelles tethered by a fluorinated block core
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由氟化嵌段核束缚的塌陷干胶束冠中聚（甲基丙烯酸甲酯）链的表面动力学受到抑制
作者：
Fan, H;Zhang, Y. Z.;He, T. T.;王新平
在聚合物将聚合物束缚在胶束芯上的背景下，研究了链约束对聚（甲基丙烯酸甲酯）（PMMA）表面动态的影响。薄膜表面以聚（2-Perfl）束缚的聚（甲基丙烯酸甲酯）（PMMA）主导
The effect of chain constraint on the surface dynamic of poly(methyl methacrylate) (PMMA) was investigated in the context of polymer tethering to a micelle core. Film surfaces dominated by either poly(methyl methacrylate) (PMMA) tethered by a poly(2-perfluorooctylethyl methacrylate) (PFMA) micelle core or non-micellized free PMMA chains are fabricated by spin coating a solution of PMMA end-capped with various numbers of FMA units onto silica substrates. By measuring the surface rearrangement kinetics of these films under thermal annealing, the onset temperature of rearrangement (TonsetR) and the activation barrier for relaxation (Ea) of surface PMMA chains are determined. It is found that the TonsetR and Ea of the PMMA micellized chains are 83 °C and 317 kJ mol−1, respectively, which are higher than those of the non-micellized PMMA free chains (70 °C and 164 kJ mol−1). The TonsetR and Ea of PMMA in the corona increase linearly with increasing compactness of the PFMA core. The higher TonsetR and Ea values demonstrate the reduced mobility of surface PMMA segments tethered to a micelle core. The constraint of conformational freedom, reduction of free volume and increment of chain packing density are proposed as the speculative origins for this depressed dynamic of poly(methyl methacrylate) chains in the corona of collapsed dry micelles tethered by fluorinated block core.
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DOI：
10.1021/la803409c
发表时间：
2009-01
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Dongwu Xue;Xinping Wang;H. Ni;Wei Zhang;G. Xue
通讯作者：
Dongwu Xue;Xinping Wang;H. Ni;Wei Zhang;G. Xue
影响因子：
16.6
作者：
Tyagi, Prashant;Deratani, Andre;Quemener, Damien
通讯作者：
Quemener, Damien
影响因子：
5.5
作者：
A. C. Miller;R. Bennett;P. Hammond;D. Irvine;R. Cohen
通讯作者：
A. C. Miller;R. Bennett;P. Hammond;D. Irvine;R. Cohen
影响因子：
5.5
作者：
S. Yamamoto;Y. Tsujii;T. Fukuda
通讯作者：
S. Yamamoto;Y. Tsujii;T. Fukuda
影响因子：
5.5
作者：
H. Peng;Y. Kong;A. Yee
通讯作者：
H. Peng;Y. Kong;A. Yee