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- (b) What type of ionic addition polymerization process would vinyl acetate be expected to undergo? Justify your answer fully.Describe the mechanism by which stereoregular polyolefins are formed in heterogeneous coordination polymerization. Complete the reaction scheme below, showing initiation, propagation and transfer to monomer steps in the synthesis of isotactic polypropylene. The catalyst, R-MLn, represents a crystalline organometallic compound, where M is a metal atom with a vacant d-orbital, R is an alkyl group directly attached to the metal atom; and Ln represents a halide ligand set. Assume all chain ends are terminated by transfer to monomer. R-MLn +(i) Define the criteria for condensation polymerisation to occur. (ii) Give one example of condensation polymer; draw the structure of the repeating unit for this polymer. (iii) Describe the application for the example polymer in your answer of Q4b (ii) above.
- The properties of polymer materials are not only influenced by the nature of the matrix polymers but also by: O -The additive composition -The type of functional groups O -The processing temperature2. Compare SANS and SAXS and NMR techniques determining polymer chain structure, which one requires dissolving the polymer in a dilute solution.Deepak has a polymer containing alternate Π-bonds and doped with oxidizing or reducing agent? Explain the type of polymer and write the properties of that polymer? What are application of such polymers?
- Q1. Calculate the number average degree of polymerization of equimolar mixture of adipic acid and hexamethylene diamine for extents of reaction 0.500, 0.800, 0.900, 0.970.1. What is Tacticity, show syndiotactic, isotactic and atactic polymer. Which is easiest to crystallize and why.Outline methods for the production of vinyl polymers using bulk methods. Vinyl polymers are polymers made from vinyl monomers, that is, small molecules containing carbon-carbon double bonds. ... When polymerized, the ethylene molecules are joined along the axes of their double bonds, to form a long chain of many thousands of carbon atoms containing only single bond between atoms.
- Describe how the stereoisomerism affect the degree of crystallinityof a semicrystalline polymer such as polyethyleneDiscuss the suitable initiator to start an addition polymerization. Define what is auto-acceleration, what causes this effect and how to minimize this effect. Briefly discuss emulsion and suspension polymerization techniques.Discuss mechanism of conductin in conducting polymers. The answe should be in more than two pages . Show structures