High-resolution thermogravimetry of poly(2,6-dimethyl-1,4-phenylene oxide)

Abstract

ABSTRACT:The thermal degradation and kinetics of poly(2,6-dimethylphenylene oxide) (PPO) were studied by high-resolution thermogravimetry. The thermogravimetry measurements were conducted at an initial heating rate of 50°C min Ϫ1 , resolution 4.0, and sensitivity 1.0 in both nitrogen and air from room temperature to 900°C. A two-step degradation process was clearly revealed in air at the temperatures of 430°C and 521°C. The thermal degradation temperatures and kinetic parameters of the PPO appear to be higher in air than in nitrogen, indicative of a higher thermostability in air. The temperature, activation energy, order, and frequency factor of the thermal degradation of the PPO in nitrogen are 419°C, 100 -120 kJ mol Ϫ1 , 0.5, and 13-17 min Ϫ1 , respectively.

High‐resolution thermogravimetry of polyphenylene sulfide film under four atmospheres

“…It is found that the ratio of average T d value in air versus average T d value in nitrogen determined by the traditional TG at heating rates of 2.5–10°C/min listed in Table I equals 0.981, suggesting that the onset of initial bond cleavage is basically thermal in nature and not influenced to any great extent by the presence of oxygen. Nevertheless, PPS exhibits higher thermostability than that of polydimethylphenylene oxide12 but lower thermostability than that of polyphenylene ether sulfone and polyimide 13, 20…”

“…The sensitivity was fixed at its default value of 1 in the temperature range of 25–790°C. Thermal degradation temperatures and kinetic parameters were determined using the techniques described previously 8–19. The degradation temperature T d was obtained by extrapolation of the initial degradation portion of the TG curve.…”

Blends of SBS triblock copolymer with poly(2,6‐dimethyl‐1,4‐phenylene oxide)/polystyrene mixture

“…Poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) is a very attractive material to be blended with other polymers because it displays a very high chemical resistance and high glass‐transition temperature ( T g ) at about 215°C 1, 2. In particular, the thermal stability1 of PPO is quite interesting, given that the degradation mechanism is a function of testing atmosphere: thermal degradation temperatures and kinetic parameters seem to be higher in air than in nitrogen.…”

Thermal degradation of biomedical polyurethanes?A kinetic study using high-resolution thermogravimetry

“…Gill et al 5 showed a number of possible applications of this technique, including the degradation study of ethylene-vinyl acetate (EVA) copolymer with different contents of vinyl acetate, the separation of different components in a polymer fiber blended with a natural one, and the polytetrafluoroethylene (PTFE) decomposition. Li studied the kinetics of thermal degradation of cellulose esters, 7 poly(2,6-dimethyl-1,4-phenylene oxide), 8 and poly(4-methyl-1-pentene). Gradwell et al 6 showed that the thermal degradation of the polyurethane/poly-(ethyl methacrylate) interpenetrating polymer networks were best understood by using the dynamic rate technique (high-resolution).…”