Elaboration and Morphology Investigation of Poly (styrene-co-acrylic acid)/Poly(styrene-co-N,N-dimethylacrylamide) Interpolymer Complexes

摘要

Random copolymers of styrene with acrylic acid (SAA) and with N, N-dimethylacrylamide (SAD) of different compositions were prepared and characterized.Depending on the nature of the solvent and the densities of interacting species incorporated within these polystyrene matrices, novel materials as soluble interpolymer complexes in THF or precipitates from butan-2-one were elaborated when SAA and SAD copolymers are mixed together due to the presence of specific interpolymer interactions. These specific intermolecular interactions were evidenced by ATR/FTIR spectroscopy, qualitatively from the appearance of new bands in the 1800-1550 cm-1 region and quantitatively using adequate spectral curve fitting for the determination of the fraction of the different species. The DSC analysis showed that all these materials as soluble or precipitate interpolymer complexes exhibited one composition-dependence glass transition temperature Tg, indicating that they are homogenous on a 20-40 nm scale. Information about the mixing at a smaller scale obtained by solid state proton NMR, provided from measurements of proton spin relaxation times T1 (H) and T1 (H) in the laboratory and rotatory frames carried out for SAA-27, SAD-17 and their (70/30 and 50/50) mixtures as cast from THF or butan-2-one, confirmed similar phase behaviour promoted by a solvatation effect.