FTIR study of poly(propylene carbonate)/ bisphenol A blends

摘要

A systematic investigation by FTIR spectroscopy was undertaken on blends of poly(propylene carbonate)(PPC)and bisphenol A(BPA).It provided direct evidence of the hydrogen bond(H-bond)between BPA O-H groups and PPC C=O groups.Using a curve-fitting method,qualitative as well as quantitative information concerning this H-bond interaction was obtained.The inter-H-bond in PPC/BPA blends was weaker than the self-H-bond in BPA.The absorptivities of the free and the H-bonded C=O groups were nearly equal.The fraction of H-bonded C=O in the blends increased with BPA content and leveled off at a value close to 40 %.Finally,FTIR-temperature measurements of pure PPC and a representative blend were reported:by monitoring the peak areas of C=O absorptions,the dissociation of the inter-H-bonds and the thermal degradation of PPC were observed.It revealed that the presence of BPA clearly retarded the thermal degradation of PPC.