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Star-Shaped Polycarbonates: Synthesis ans Characterization

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Abstract:
Star-shaped poly(trimethalene)carbonates is an aliphatic polycarbonates with a unique 3-D structure. This polymer can be used as a building block to prepare nanoparticles with tunable sizes from polymers with different arm lengths. Such polymers have good biocompartibility, low toxicity, excellent mechanical properties and biodegradability, have promising applications as drug carriers and other biomedical fields. We first synthesized trimethalene  carbonate (TMC) monomer from 1,3-propandiol and chloroformate ester with catalyst. Star-shaped poly(trimethalene)carbonates was then synthesized through TMC polymerization using Sn(Oct)2 and inositol as the catalysts.
Several variable factors, including reaction temperature ,  time, and the ratio of monomer and initiator were studied for the effect on the polymerization reaction, assessed by analyzing the polymer molecular weight, structure and thermal properties using GPC, IR and DSC tests.  The results indicated that the best polymerization condition for the best  yields  was 120 C, 32hrs,  with  a monomer/initiator ratio of 90/1, while the best reaction condition for high MW polymers was 140 C, 24 hrs, with  a monomer/initiator ratio of 30/1.
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2Â¥: Originally posted by genhunter at 2015-03-30 12:38:42
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Star-Shaped Polycarbonates: Synthesis ans Characterization

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