Study On Design,Synthesis And Properties Of Novel Phenylethynyl-terminated Aryl Ether Ketone Oligomer

High temperature, solvent resistant materials which also display good mechanical properties are desired for use as aerospace structural adhesives and polymer matrix/carbon fiber composites. However, the high performance/high temperature polymers typically exhibit high melt viscosities and insoluble in common organic solvent, as a consequence, processability by compression and injection moulding for use as composite matrices and adhesives is often difficult or unachievable. In recent years, in an effort to address the problem of high melt viscosities, development of low molecular weight oligomers with phenylethynyl terminated group as cross-linking precursor for the preparation of high performance thermosets has attracted considerable attention. Since the oligomeric glass transition temperature value or melt temperature can be designed to be below 200℃(or Tg be below 250 ℃) there is a desirable large melt processing window for these materials between Tg(Tm) and Tcure. Moreover, the melt viscosity of general oligomeric poly(arylene ether)s is very low, between 250℃and 350℃, suggesting applicability to processing techniques such as resin infusion(RIM) and/or resin transfer molding(RTM) which are attractive methodologies for the economical manufacture of polymer matrix/carbon fiber composites. Herein a new star-branched, phenylethynyl-terminated aryl ether oligomer which posses lower melt viscosities and/or high solubility and lower melt temperature before cure was prepared.. While its cured polymer exhibit high Tg, thermo-oxidatively stable, solvent-resistant networks. DSC date clearly showed that the uncured oligomer has a low melt temperature and displayed a wide process window. While a low melt viscosity at 280℃...