Polyvinyl acetate obtained by emulsion polymerization was fractioned by Baker and William's type column fraction method and the results of fraction were discussed. Acetone-water mixture was used as the solvent and sea sand (15∼20mesh) as the column ...
Polyvinyl acetate obtained by emulsion polymerization was fractioned by Baker and William's type column fraction method and the results of fraction were discussed. Acetone-water mixture was used as the solvent and sea sand (15∼20mesh) as the column carrier. Ne number average molecular weights(Mn) of fraction were determined by osmotic pressure method at 37℃ and weight average molecular weights(Mw) were determined by light setting method at 25℃ The intrinsic viscosity measurements were taken at various temperatures and the following equations were obtained fractionated PVAc in acetone solution at various temperature. 〔η〕=5.93×10-4Mn0.62 (30℃, Acetone) 〔η〕=3.66×10-4Mn0.65 (37℃, Acetone) 〔η〕=5.22×10-4Mn0.61 (30℃, Acetone)