Synthesis and characterization of new hyperbranched poly(aryl ether oxadiazole)s

Rheological behaviour and cure kinetic studies of a trifunctional phenylethynyl-terminated imide oligomer

A phenylethynyl-terminated imide oligomer (PETI)was prepared from a triamine and 4-phenylethynylphthalic anhydride. The oligomer can be used to prepare high performance resin-based composite material via resin transfer moulding due to its low melt viscosity. The cured resin also exhibited excellent thermal stability with 5% weight loss at temperature above 531°C and higher glass transition temperature Tg (410°C) than PETI series as a result of the introduction of star-branched units. The rheological properties of the oligomer were measured and numerically fit with the dual Arrhenius model. The curing of the resin was also studied by dynamic and isothermal differential scanning calorimetry measurements. Based on the experimental data, both the curing reaction rate and the curing degree were calculated in the dynamic mode and tested under isothermal conditions.

Thermal Degradation Kinetics of some Aromatic Poly(1,3,4-oxadiazole-ether)s

Poly(1,3,4-oxadiazole-ether)s containing isopropylidene, hexafluoroisopropylidene, cyclohexylidene, fluorene, phthalide or phenylquinoxaline groups have been prepared by nucleophilic substitution polymerization technique of 2,5-bis( p-fluorophenyl)-1,3,4-oxadiazole with various aromatic bisphenols. The thermal decomposition behavior of the polymers was studied using thermogravimetric analysis in air, at several heating rates: 6, 10 and 14° C min . The polymers showed high thermo-oxidative stability with decomposition temperature corresponding to 5% weight loss above 380°C. The kinetic processing of data was carried out using the Coats—Redfern, Reich—Levi, Flyn—Wall and Kissinger methods.