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Quiz3cor_E - 3 Give the mechanism for the formation of...

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CHM 2123, Quiz #3: Preparation of Polymers MARKING SCHEME Posted: September 24, 2009 Due: September 28, 2009 before 5pm Note: These marking schemes are only a guide… use your judgement when evaluating the students’ answers! 1. Give the structure of the monomer and the polymer for each of the following commonly used polymers: ( 4 points ) A-Polypropylene: Me C C H Me H H B-Kevlar: H N N H O O n H 2 N NH 2 + O X O X C-Nylon-66 (hint: this is an alternating copolymer , so there are 2 different monomeric units): Or, for a monomer, they could also give: 2. When heating the methyl methacrylate reaction to 90-95 o C, why do bubbles evolve from the solution? ( 1 point ) Carbon dioxide is released from the initiation reaction
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Unformatted text preview: 3. Give the mechanism for the formation of polystyrene from styrene and benzoyl peroxide. Include initiation, propagation, and termination steps. ( 3 points ) Or the recombination of 2 radicals… 4. In industry, processes involving living polymers are often desirable. What are living polymers ? (2 points) The term living polymerization is used when the termination step of a polymerization is very slow or non-existent. Polymerization will therefore continue as long as there is monomer present… This can allow for the controlled synthesis of co-polymers, etc....
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