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Particle Features of Poly(vinyl Chloride) Resins Prepared by a New Heterogeneous Polymerization Process by Y. Z. Bao; B. W. Brooks is a Materials Science article available to read on EtoBox.

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## Abstract The heterogeneous polymerization of vinyl chloride monomer (VCM), with __n__‐butane as the reaction medium, was used to prepare poly(vinyl chloride) (PVC) resins. The particle features of the resulting resins and the particle formation mechanism of the polymerization process were investigated. The PVC resins prepared by the new polymerization process had a volume‐average particle size comparable to that of suspension PVC resins and a lower number‐average particle size. From scanning electron micrographs, it could be seen that the new PVC resins had a regular particle shape and a smooth surface with no obvious skin. They also had a high porosity. The new PVC resins were composed of individual and loosely aggregated primary particles. The diameter of the primary particles in the top layer of the grains was smaller than that of the primary particles in the center part of the grains. On the basis of the particle features of these PVC resins, a particle formation mechanism for the new polymerization process was proposed. PVC chains precipitate from a VCM/__n__‐butane mixed medium to form primary aggregates at a very low conversion, and the primary aggregates of the PVC chain

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Author

Y. Z. Bao; B. W. Brooks

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0021-8995)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)