Abstract
AbstractThe radical polymerization of acrylonitrile in the presence of nuclear‐substituted triphenyl phosphites (p‐Cl, H, p‐CH3, p‐OCH3) initiated by α,α′‐azobisisobutyronitrile at 50°C was investigated. It was found that the rate of polymerization decreased at low concentrations of phosphite, but after reaching a minimum the rate increased again with further increase in the phosphite concentration in the case of all substituted triphenyl phosphites. Formation of a weak complex between phosphite as donor and acrylonitrile as acceptor was confirmed from the change in chemical shifts of vinyl protons to higher magnetic fields on NMR spectroscopy. From the results of continuous variation method using NMR spectra, the complex was found to be of the 1:1 type. The effects of substituted triphenyl phosphite on the rate of polymerization and the chain‐transfer reaction to substituted triphenyl phosphites are discussed on the basis of these results.
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