Vinyl Stearate Research Articles

Polymerizable Derivatives of Long-Chain Fatty Acids Vinyl Stearate and Copolymerization of Vinyl Chloride with Other Vinyl Esters

Polymerizable Derivatives of Long-Chain Fatty Acids Vinyl Stearate and Copolymerization of Vinyl Chloride with Other Vinyl Esters

Surface Chemistry of High Polymers. I. Non-electrolytic Flexible Linear Polymers at Air/Water Interface

Abstract The surface films of some linear non-electrolytic polymers such as polyvinyl acetate, polyvinyl stearate and copolymers between them were studied at the air/water interface by measuring surface pressure, and surface potential in relation to the area occupied per monomer. The surface concentration was changed by two different methods, namely by the compression with barrier and by the successive addition by injection with micrometer syringe. Polyvinyl acetate gave the film of expanded type and was hardly affected by its degree of polymerization. Polyvinyl stearate gave the film of coherent type and its F—A curve resembled that of polyoctadecyl methacrylate. The copolymer with moderate content of vinyl stearate showed the smaller limiting area per monomer than polymers of its constituents. The results were discussed in relation to the molecular model and to the methods adopted to change the surface concentration.

Polymerizable derivatives of long‐chain fatty acids. VII. Copolymerization of vinyl acetate with some long‐chain vinyl esters

AbstractA study was made of the copolymerization of vinyl acetate with vinyl palmitate, vinyl stearate, and vinyl oleate, respectively, True copolymerization was shown to have occurred on the basis of the solubility characteristics of the crude copolymers over a wide range of compositions. The monomer reactivity ratios for the comonomers vinyl palmitate (r1) and vinyl acetate (r2) were determined by two methods. One, based on an analysis of the copolymer, gave r1 = 0.78 ± 0.10 and r2 = 1.15 ± 0.13; the other, based on an analysis for each monomer in the mixture remaining after polymerization, gave r1 = 0.66 ± 0.07 and r2 = 0.84 ± 0.10. When the vinyl palmitate or vinyl stearate content of the copolymer exceeded about 20–25 mole per cent, the copolymers exhibited first‐order transition points which were determined using a refractive index technique as well as a polarizing microscope method. Where no transition point could be observed, brittle point measurements were made.