Abstract
The mechanism of polymerization of vinyl chloride in bulk, butyl chloride, butyl acetate solution was studied at 50 and 60 C, with ace-azobisisobutylonitrile used as initiator. The rate of polymerization (Rp) was found proportional to the square root of the initiator concentration ([I]) in each case at 50°C and in butyl chloride at 60°C. In bulk and butyl acetate at 60°C, however, the exponent of [I] showed 0.82 and 0.70 power, respectively. As for the monommer concentration, Rp was proportional to the 1.30 power in butyl chloride and to the three-halves power in butyl acetate. The value of 0.70 power in butyl acetate at 60°C can be explained by the combination of the bimolecular and apparent unimolecular termination, considering the chain transfer of monommer and solvent. The 1.30 power of the monommer concentration in butyl chloride is assumed that the initiation step consists of two initiation mechanism. Then, Rp is written as follows:
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where AI and BI are constant.
