The polymerization of poly(vinyl chloride) (PVC), head-to-head macroradical plays an essential role in the formation of branches and the appearance of interruption processes that lead to labile unsaturated end groups. A reaction mechanism is suggested to explain these processes and the method of ...
or oxidzers. Large fires of ths material are practically inextinguishable. A severe explosion hazard in the form of vapor when exposed to heat or flame. Long-term exposure to air may result in formation of peroxides that can initiate explosive polymerization of the chloride. Can react vigorousl...
Our line of vinyl chloride emulsions are aqueous anionic dispersions of vinyl chloride and copolymers produced by emulsion polymerization. lubrizol.com lubrizol.com 我们的氯乙烯乳 液系列是通过乳液聚合作用制成的水 性 氯乙 烯及 共聚物阴离子分散剂。 cn.lubrizol.com cn.lubrizol.com The use of CTC...
The rate of polymerization of vinyl chloride in a solution of PVAL and the yield of products in the form of latex are shown to depend to a great extenet on the hydrodynamic state of the system as it polymerizes. The product consists of the two homopolymers and a graft copolymer. Various...
CONSTITUTION:For example, a polymerization initiator containing a peracid ester shown by the formula (R is 1-7C alkyl, etc., when n=1 or ethylene when n=2) prepared by a hydroperoxide such as t-butylhydroperoxide with a propanoic acid chloride such as 2(1,2-dimethylpropyl)-2-(2,2-...
被引量: 21 摘要: The present invention pertains to a process for controlled free radical polymerization or copolymerization of vinyl chloride at a temperature between 40 °C and 95 °C, at a pressure between 5 and 30 bar in the presence of a stable free nitroxyl radical.收藏...
To prevent the deposition of polymer scale to the inner walls of a polymerizer, completely, by coating the inner walls of the polymerizer with a specific compound, using an oil-soluble peroxide as a polymerization catalyst, and adding a water-soluble sulfur compound to the polymerization system...
The processability of rigid poly(vinyl chloride) can be improved by adding trichloroethylene as chain-transfer agent, increasing the polymerization temperature, and especially by combining the two effects together. The resulting synergistic interaction is best expressed by an equation of the form, P =...
2.2.2.1Side-group degradation mechanism: Polyvinylchloride, polyvinylbromide and polychloroprene Halogenated vinyl-polymers as polyvinylchloride (PVC), polyvinylbromide (PVBr) and polychloroprene (PCP) are characterized by side-groups chemical bonds that are weaker compared to backbone CC bonds. PVC is ...
When PVC is prepared by polymerization at a low concentration of monomer, it also has a detectable number of internal double bonds. In poly(vinyl chloride-co-carbon monoxide), the carbon monoxide is contained in chlorocarbonyl branches. These branches are formed by the addition of monomer to -...