Abstract
Concentration change of sensitizer during vinyl acetate polymerization photosensitized by 1, 1′-azo-biscyclohexanecarbon-itrile was measured with use of a spectro-photometer and the initiation velocity of polymerization was determined. Values of kp and kt at various degree of conversion were calculated from this value and the results of the previous paper. From this experiment, it was concluded that kp was nearly constant up to 40% conversion and as the conversion exceeded 40%, it decreased, while kt gradually decresed with the increase of the conversion.