Effect of triphenyl phosphite on the radical polymerization of styrene and methyl methacrylate

Abstract

SynopsisThe effects of triphenyl phosphite (TPP) on the radical polymerization of styrene (St) and methyl methacrylate (MMA) initiated with qa,-azobisisobutyronitrile (AIBN) was investigated at 50°C. The rate of polymerization of St and MMA at a constant concentration of TPP was found to be proportional to the monomer concentration and the square root of the initiator concentration. The rate of polymerization and the degree of polymerization of both St and MMA increased with increasing TPP concentration. The accelerating effect was shown to be due to the decrease of the termination rate constant kt with an increase in the viscosity of the polymerization systems. The chain transfer constant Ct, of TPP in St and MMA systems was determined from the degree of polymerization system. The Ct, of TPP was almost zero in the St system and 6.5 X lo+ in the MMA system.

Synthesis of tellurium containing syndiotactic polymethyl methacrylate using diphenyl ditelluride as a novel initiator

“…The intrinsic viscosity of polymer(s) was determined in benzene at (30 ± 0.1)°C using an Ubbelohde viscometer. The average degree of polymerization ( P n ) was calculated 20 from following equation: …”

Methylmethacrylate polymerization photoinitiated by 1‐(bromoacetyl)pyrene

“…The intrinsic viscosity () of the polymers was determined in benzene at 30°C using an Ubbelohde viscometer.The average degree of polymerization P n was calculated by the following equation: 17 log P n ϭ 3.342 ϩ 1.13 log []…”