Download PDF by Yury Kissin: Alkene Polymerization Reactions with Transition Metal
By Yury Kissin
The booklet describes the most recent advertisement polymerization catalysts for the synthesis of polyethylenes and polypropyleneThe publication presents an in depth description of the multi-center nature of industrial Ziegler-Natta catalysts.The ebook devotes really good chapters to crucial facets of transition steel polymerization catalysts: the reactions resulting in the formation of lively facilities, the chemistry and stereochemistry of elemental polymerization steps, response kinetics, and the polymerization mechanism. The booklet comprises an introductory bankruptcy for researchers who're coming into the sector of polymerization catalysis. It describes the fundamental ideas of polymerization reactions with transition-metal catalysts and the kinds of commercially synthetic polyolefins and copolymers
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Extra info for Alkene Polymerization Reactions with Transition Metal Catalysts
3. Poly(cycloalkenes) and cycloalkene copolymers Cycloalkenes are polymerized by means of two different mechanisms. Catalysts based on tungsten, ruthenium, and molybdenum compounds (ROMP catalysts) induce the metathesis reaction, ring-opening polymerization of monocycloalkenes with the formation of elastomers containing regularly spaced double bonds in polymer chains [100,101]. The polymerization of cycloalkenes with metallocene catalysts produces polymers and copolymers with a completely different structure.
These polymerization reactions are usually carried out at 50–801C in slurry in pure monomers or in their mixtures with hydrocarbon solvents [96–98]. Isotactic poly(1-butene) is a semi-crystalline plastic. It has very strong resistance to creep at moderate temperatures and is used to manufacture pipe and tubing, as well as film. Isotactic poly(4-methyl-1-pentene) is also a semi-crystalline plastic. Its applications usually capitalize on high optical transparency of the resin, its excellent dielectric characteristics, high thermal stability, and chemical resistance.
The above three conditions of center uniformity do not translate into complete identity of all polymer chains even when the polymerization reactions are carried out under stable, carefully controlled conditions. For purely statistical reasons, different polymer chains will still have different molecular weights and slightly different isotacticity or syndiotacticity, and different copolymer molecules will have slightly different compositions. These purely statistical deviations from average values can be strictly defined in mathematical terms.
Alkene Polymerization Reactions with Transition Metal Catalysts by Yury Kissin