Influence of the Polymer with High Molecular Weight on the Solvent-induced Dewetting Dynamics of the Polymer Thin Film with Low Molecular Weight†

doi:10.7503/cjcu20140278

Abstract

Abstract:

The dewetting dynamics of the polystyrene(PS) thin film induced by the solvent of acetone with the method of optical microscopy(OM) and Ellipsometer were investigated. We compared the dewetting dynamics of the monodiperse PS with low molecular weight(PSL), that with high molecular weight(PSH) and the mixture of the PSL and PSH(PSM). It was observed that their dewetting behavior was different although the radius of the holes vs. time exhibited exponential behavior for all samples. As for monodiperse PS, there is the difference in rim morphologies because of the viscosity difference between the PSL and the PSH. As for the PSM, the anomaly of the deweting velocity with the addition of PSH happens due to effect of the chain connectors which were partially in the entangle polymer film and partially in the top film.

Key words: Polymer thin film, High molecular weight polystyrene, Low molecular weight polystyrene, Mixture, Dynamics of dewetting

CLC Number:

O631

TrendMD:

LIU Hui, ZHENG Yisong, SHI Tongfei. Influence of the Polymer with High Molecular Weight on the Solvent-induced Dewetting Dynamics of the Polymer Thin Film with Low Molecular Weight^†[J]. Chem. J. Chinese Universities, 2014, 35(7): 1565.

Figures/Tables 6

Fig.1 Experimental device of dewetting process

Fig.2 Optical microscopy images of the PS films with different molecular weight[Mw=2.46×103(A) and Mw=1.39×105(B)] and film thickness of (30±5) nm on the Si wafer with the native oxide layer induced by acetone vapor at room temperature

Fig.3 Dependence of hole radius on time for the PS films with different molecular weight[Mw=2.46×105, h=(30±5) nm(A), Mw=1.39×105, h=(30±5) nm(B)] induced by acetone vapor at room temperature

Fig.4 Optical microscopy images of the mixture PS films with different molecular weight on the Si wafer with the native oxide layer induced by acetone vapor at room temperature (A) Mix(17-1); (B) Mix(2-1); (C) Mix(1-1).

Fig.5 Dependence of hole radius on time for the films with the mixture of the monodisperse PS with different molecular weights induced by acetone vapor at room temperature and whole plot for high molecular weight 1.39×105 before the hole coalescence(inset)

Fig.6 Sketch of the mixture of the PS film

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