期刊
MACROMOLECULES
卷 55, 期 16, 页码 7110-7116出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.2c00801
关键词
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资金
- National Natural Science Foundation of China [22161160317, 22173081, 21873085]
- Foundation of Zhejiang Sci- Tech University [21062110-Y]
The surface dynamics of supported poly(ethylene terephthalate) films were investigated and it was found that the propagation distance of the substrate effect is a crucial parameter affecting the dynamics and chain mobility distribution in polymer thin films. Changing the film thickness or the adsorbed layer thickness can lead to a gradual change in surface dynamics and eventually the disappearance of spatially heterogeneous dynamics.
The spatially heterogeneous dynamics in supported ultrathin polymer films are widely recognized to explain their unique thickness-dependent physical properties. In this paper, the surface dynamics of supported poly(ethylene terephthalate) films were scaled by the surface crystallization rate to investigate the variations of the spatially heterogeneous dynamics with various thicknesses of the film (h) and the adsorbed layer (h(ads)). It was found that the utmost propagation distance of the substrate effect (h(s)), which increased with h(ads), is a crucial parameter affecting the surface dynamics and determining the spatial distribution of chain mobility in polymer thin films. Either decreasing h or increasing h(ads), to induce h < h(s) causes the surface dynamics to gradually change from the highest undisturbed mobility to greatly suppressed to an eventual uncrystallizable state, corresponding to the fading of the spatially heterogeneous dynamics. These observations will help us to further understand the heterogeneous chain mobility distribution in supported polymer ultrathin films.
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