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Influence of grafting on the glass transition temperature of PS thin films

Influence of grafting on the glass transition temperature of PS thin films

Published in The European Physical Journal E

We present an investigation of the effect of the interaction between a thin polystyrene film and its supporting substrate on its glass transition temperature (Tg). We modulate this interaction by depositing the film on end-tethered polystyrene grafted layers of controlled molecular parameters. By comparing Tg measurements versus film thickness for films deposited on different grafted layers and films deposited directly on a silicon substrate, we can conclude that there is no important effect of the film-substrate interaction. Our interpretation of these results is that local orientation and dynamic effects substantial enough to influence Tg cannot readily be obtained by grafting prepolymerized chains to a surface, due to intrinsic limitation of the surface grafting density.

https://dx.doi.org/10.1140/epje/i2017-11500-2
https://arxiv.org/abs/1701.04711