Polymer
Polymer
4 years ago

Reversibility in glass transition behavior after erasing stress induced by spin coating process

Reversibility in glass transition behavior after erasing stress induced by spin coating process
The influence of the sample preparation on the observed dependence of glass transition temperature (T g ) with thickness in polystyrene (PS) thin films has been investigated. Spectroscopic ellipsometry was used to measure the T g of PS thin films ranging from 7 to 85 nm before and after exposition to supercritical carbon dioxide (sc-CO2). We take advantage of the sc-CO2 properties along with thermal annealing treatment to cancel out sample preparation history factor by removing the remnant solvent and residual stresses. The decrease in T g shows exactly the same trend before and after sc-CO2 exposure plus thermal treatment. This result cancels out the influence of the spin coating process on the T g depression in thin films.

Publisher URL: www.sciencedirect.com/science

DOI: S0032386117306146

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