Studies on Polymerization of Vinyl Chloride
XI A Few Results Obtained from Copolymerization of Vinyl Chloride and Crotonic Acid Derivatives
1959 Volume 16 Issue 169 Pages 308-313
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1959 Volume 16 Issue 169 Pages 308-313
The copolymerization of vinyl chloride (VC) and crotonic acid derivatives was studied at 50°C in emulsion system, with potassium persulfate-sodium sulfite used as initiator. Derivatives are crotonic acid (I), ethyl crotonate (II), vinyl crotonate (III) and allyl crotonate. MRR is r1=2.4, r2=0 in (I), r1=2.0, r2= 0 in (II) and r1= 0.98, r2=0.97 in (III), respectively, Crotonyl group copolymerizes with VC to the same degree as vinyl acetate does with VC. Copolymers of VC-I and VC-II are soluble to aceton-methanol mixed solvent. There component copolymerization of vinyl chloride-vinyl crotonate differs from vinyl chloride-vinyl acetate-crotonic acid system, and the former is restricted in the copolymerization prosses. The k′ of Huggins at the gel point by cross-linking is 0.53, and the chain transfer constant of crotonic acid is 2.1×10-3.
