Thermal decomposition of the copolymer styrene-oxygen

Vinyl Monomer Based Polyperoxides as Potential Initiators for Radical Polymerization: An Exploratory Investigation with Poly(.alpha.-methylstyrene peroxide)

“…From an Arrhenius plot, the activation energy (E&) was found to be 34.6 kcal/mol, which matches with the value reported by Mayo et al20 Thus, it may be seen that the decomposition of PaMSP in its neat form as well as in solution follows the same activation process, which is consistent with literature reports. [18][19][20][21][22][23][24][25] Kinetics of Low-Conversion Polymerization. Pa-MSP was utilized as a free radical initiator for the polymerization of MMA and styrene.…”

“…Such a low efficiency has been reported for styrene polymerization using poly(styrene peroxide) as initiator. 18 The reason for the very low efficiency in the case of PaMSP can be explained as follows.…”

Ultrasonic degradation of polyvinylpyrrolidone: Effect of peroxide linkages

“…Furthermore, while polyvinylpyrrolidone synthesized under vacuum is stable up to 180"C, the polymer synthesized under oxygen readily degradates at 160 both in solid phase and in solution. This reduced stability is also compatible with the introduction of peroxide linkages (9). Eight copolymer fractions of the oxygenated polymer obtained by partial precipitation in chloroform (solvent) and ethyl ether (nonsolvent) mixtures at 25°C (10) were studied in order to obtain the relationship between their molecular weight Ultrasonic irradiations were carried out using a Braunsonic 300s operating at 50% of its full intensity, which nominally is 25 W at 20 kHz.…”

“…The number of broken bonds per molecule Bt/no can be estimated by the relation (1 2):where Po and P, are the viscosity-mean degree of polymerization before irradi-Variation of the intrinsic viscosity[9] with the time of degradation for ( 0 ) P W (M = 360,000), (0) F6 copolymer 3, and (A) P W (M = 40,000).…”