Confinement Effect on the Effective Viscosity of Plasticized Polymer Films
Confinement Effect on the Effective Viscosity of Plasticized Polymer Films
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DOI：
10.1021/acs.macromol.5b01780
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发表时间：
2015-10-27
期刊：
影响因子：
5.5
通讯作者：
Tsui, O. K. C.
中科院分区：
文献类型：
--
作者：
Chen, F.;Peng, D.;Tsui, O. K. C.
我们已经测量了聚苯乙烯薄膜的有效粘度与少量（4wt%）添加量的邻苯二甲酸二辛酯（DOP）沉积在二氧化硅上。研究了分子量M-w从13.7至2100 kg/mol的宽范围。我们的结果表明，对于M-w <类似于400 kg/mol的薄膜，DOP的加入使有效粘度降低了约4倍，与M-w无关。但对于较高M-w的膜，添加DOP的膜的有效粘度随着M-w的增加而向纯膜的有效粘度蠕变。一个模型假设的有效粘度占主导地位的增强表面流动性较低的M-W膜，但表面促进界面滑移较高的M-W膜是能够占实验观察。
We have measured the effective viscosity of polystyrene films with a small (4 wt %) added amount of dioctyl phthalate (DOP) deposited on silica. A broad range of molecular weights, M-w, from 13.7 to 2100 kg/mol was investigated. Our result shows that for the thin films with M-w < similar to 400 kg/mol the addition of DOP causes the effective viscosity to decrease by a factor of similar to 4, independent of M-w. But for the higher M-w, films, the effective viscosity of the DOP added films creeps toward that of the neat films with increasing M-w. A model assuming the effective viscosity to be dominated by enhanced surface mobility for the lower M-w films but surface-promoted interfacial slippage for the higher M-w films is able to account for the experimental observations.