Surface Analysis of the Styrene-Butyl acrylate Copolymer Latex Film

摘要

Styrene (St) -butyl acrylate (BA) polymer latexes with different copolymerization composition were synthesized by miniemulsion polymerization. The final latexes were dried on PTFE (Polytetrafluoroethylene) to prepare a series of films. The surface composition of the obtained films are studied by attenuated total reflection with Fourier transformed infrared spectroscopy (ATR-FTIR). The analysis results show that the sodium dodecyl sulfate (SDS) concentration at film-substrate (PTFE) interface is always much higher than that at film-air interface. This phenomena relates to the "film formation towards the substrate" and the interfacial tension of film/substrate. The magnitude of enrichment of SDS is more abundant in the polymeric film with relatively low Tg.