Study of Interface Segregation Behavior in Acrylate Copolymer/Fluoro-copolymer Blends using FT-IR Phase-modulated Photoacoustic Spectroscopy

Abstract The interface segregation was investigated for poly(2-ethylhexyl acrylate-co-acrylic acid-co-vinyl acetate) (P(2EHA-AA-VAc))/poly(vinylidene fluoride-co-hexafluoro acetone (P(VDF-HFA)) blends coated on poly(dimethyl siloxane) (PDMS) by FT-IR phase-modulated photoacoustic spectroscopy (PAS-FTIR). The P(2EHA-AA-VAc) component segregated at the PDMS-polymer interface and its concentration exponentially changed from the interface in the depth direction. The observed PAS-FTIR spectra for respective phase angles corresponded to the magnitude PAS-FTIR spectra for arbitrary phase angles which were calculated with the PAS-FTIR spectra at two phase angles.