Quiz3A - 1 CHM 2123, Quiz #3: Preparation of Polymers...

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1 CHM 2123, Quiz #3: Preparation of Polymers Assigned: September 28, 2006 Due: October 2, 2006, before 5pm MARKING SCHEME 1. In polymer chemistry, it is often said that obtaining a polymer with certain desired physical properties is often more a problem of engineering than of chemistry. Why is this the case? (2 points) Two polymers resulting from the same catalyst and the same monomers can still have very different morphologies. Factors such as the type and size of reactor, the temperature, the rate of addition of the monomer, the quantity of catalyst, etc. can all influence it’s physical properties. This can be explained by variations in the length of the chains and by different polydispersities (distribution of chain lengths) of the polymer. 2. 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
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This note was uploaded on 01/25/2011 for the course MAT 1330 taught by Professor Dumitriscu during the Spring '08 term at University of Ottawa.

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Quiz3A - 1 CHM 2123, Quiz #3: Preparation of Polymers...

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