pset1 - Problem Set 1 Issued: 02/07/06 Due: 02/16/06 10...

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Problem Set 1 20.462J/3.962J Issued: 02/07/06 Spring 2006 Due: 02/16/06 10 points/problem 1. Listed in the table below are chemical and schematic structures of poly(L-lactide) and a number of derivatives of this polymer. a. Using physicochemical criteria, predict the hierarchy of degradation rates for these materials. Provide a concise but thorough explanation of your ranking. State any assumptions you make. b. State 2 physical properties/parameters you would measure for each polymer to make your ranking more accurate, and explain your choices. c. Polymer Chemical structure microstructure Poly(L-lactide) O CH 3 C CH O Semicrystalline CH O C O CH 3 n Poly(lactide-co- O CH 3 O glycolide) CH C O CH C O O C H 2 CH 3 C O H 2 C C O O x y amorphous Poly(lactide-b-ethylene O CH 3 oxide) C CH O H 2 C Semicrystalline CH O C CH 2 O O CH 3 x y polycaprolactone O -((CH 2 ) 5 -C-O-) n - = semicrystalline 20.462J/3.962J PS 1 1 of 3 9/5/06
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2. Given below are data from in vitro degradation experiments on poly(lactide-co-glycolide) and
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This note was uploaded on 11/11/2011 for the course BIO 20.410j taught by Professor Rogerd.kamm during the Spring '03 term at MIT.

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pset1 - Problem Set 1 Issued: 02/07/06 Due: 02/16/06 10...

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