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Polymerization of vinyl chloride in the presence of acetaldehyde. Vinyl polymerization. LIII.

1961; Wiley; Volume: 48; Issue: 1 Linguagem: Inglês

10.1002/macp.1961.020480109

0025-116X

Minoru Imoto, Kiichi Takemoto, Yoshikazu NAKAI,

Epoxy Resin Curing Processes

Abstract The polymerization of vinyl chloride initiated by azo‐bis‐isobutyronitrile was carried out in tetrahydrofuran at 50°C., in the presence of acetaldehyde. It was found that the rate of polymerization was proportional to the monomer concentration, and to the square root of the initiator concentration, and was inversely proportional to the acetaldehyde concentration. Degree of polymerization of polymers was obtained in the range of 50‐‐100 by viscometry, and from these values chain transfer constants to acetaldehyde, C A , and to the solvent, C S , were computed as 1.1 · 10 −‐2 , and 2.4 · 10 −‐3 , respectively. Polymers were insoluble in tetrahydrofuran, differing from the commercial polyvinyl chloride. The absorbance ration D 635 /D 692 was found in the range of 2.0‐‐2.7, and the ration increased with the increasing concentration of acetaldehyde in polymerization. Chemical and spectroscopic analyses were further carried out for the polymers; and from the results it was concluded that only one or two units of acetaldehyde were incorporated in polyvinyl chloride chain.