Gel permeation chromatography in the study of the molecular weight distribution of the copolymer vinyl chloride–vinyl acetate

Abstract

SynopsisA sample of the commercial copolymer vinyl chloride-vinyl acetate was fractionated by the GPC method in the preparative scale. The fractions thus obtained were characterized by light scattering, viscometry, GPC in the analytical scale, chemical analysis, and IR spectroscopy. They were'com- polymer. Effects which could change the correct interpretation of the GPC data were discussed in detail. Correct interpretation of the GPC data showed an agreement between the GPC, light Scattering, and viscometric data within 6-7%.

Correlation between molecular structure and copolymer composition and the Mark-Houwink constants of methyl methacrylate/N-phenylmaleimide copolymers

“…The values of intrinsic viscosity and viscosity-average molar mass were obtained from the universal calibration, whereas the number-average and weight-average molar masses were calculated from the relative calibration. According to Janca and Kolinsky 16) , the number-average molar mass is more sensitive than the corresponding viscosity-average molar mass with regard to differences in the polydispersity of copolymers. It can easily be seen in Fig.…”

Copolymer analysis

“…(S.12) P(VC-V Ac) copolymers were fractionated by preparative SEC, and fractions having a vinyl acetate (V Ac) content between 10% and 13% were subjected to the determination of the constants of the Mark-Houwink equation in THF at 2SoC [13]. The equation for the copolymer was…”

Effect of polymerization conditions on the melt rheological properties of vinyl chloride–vinyl acetate copolymers

“…(1) water 5000 g; (2) suspending agent 4.5 g; (3) sodium bicarbonate 4.5 g; (4) vinyl chloride and (5) vinyl acetate, 3000 g (total); (6) trichloroethylene, as indicated; (7) initiator (type and level), as indicated; (8) polymerization temperature, as indicated. Items 1,2,3,5,6, and 7 were added to the reactor under a nitrogen purge.…”