The mechanism of growth of PVC granules was investigated by injecting additional vinyl chloride monomer into a conventional suspension polymerization process at two different conversions. Polymerization was sustained for long periods in both cases, with the injection before pressure drop producing a more rapid decrease in properties such as porosity and surface area. With injection after pressure drop, additional polymer growth produced a structure with noticeably inferior plasticizer absorption and gelation properties, even though porosity and surface area values were higher. A discussion of the growth mechanism of PVC granules under the two injection systems is presented and related to the conventional suspension process.
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Michael W. Allsopp (1977) studied this question.
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