Abstract
A radiotracer technique based on the addition of 125I Cl has been used for estimating double bonds in poly(vinyl chloride) formed by polymerization under homogeneous conditions in 1,2,-dichloroethane,1,1,2-trichloroethane and 1,1,2,2-tetrachloroethane. From the data on polymer made at a 5 M monomer concentration and neglecting mutual termination the transfer constants to these three solvents increase approximately in the ratio 1:2:6 as the chlorine content increases. From the increase in the number of double bonds per monomer unit in the polymer as the monomer concentration is decreased in the polymerization it is concluded that mutual termination involves some disproportionation. In dichloroethane disproportionation appears to be the main mechanism of mutual termination.
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