Mechanical Properties of Bis-Phenol-A Polysulfone and Acetylene Terminated Bis-Phenol-A Blend

摘要

Torsion Impreganted Cloth Analysis (TICA) has been used as a technique to study the compatibility of two high temperature polysulfone thermoplastics with three acetylene terminated oligomers. Detailed property evaluations were made for blends of bisphenol A polysulfone (PSF) and 4, 4'-(3-ethynlphenoxy)phenyl dimethylmethane (ATB). TICA and DSC measurements have shown the uncured blends to be compatible by the usual criterion of a single composition dependent glass transition over the range of compositions from 0 to 30 wt % ATB. A blend containing 30% ATB was shown to be easily processed at 150 deg C, a temperature more than 100 degrees lower than required to melt fabricate PSF alone. Tensile testing of the molded blends indicated embrittlement and moderate break strength. Nearly total cure of the ATB in these blends could be achieved by heating molded films to higher temperature (e.g., 225 degrees C) for several hours. The curing process apparently leads to phase separation of the PSF component, but results in an overall improvement in tensile properties and suggestion of improved resistance to solvent attack. (Author)