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zhangfangzhi木虫 (职业作家)
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【讨论】RAFT 末端不带硫代羰基的死聚合物链有多少
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RAFT后，末端不带硫代羰基的死聚合物链有多少，占总分子链多大比例？ Ezio Rizzardo说， A key feature of RAFT polymerization is that the thiocarbonylthio groups are retained in the polymeric product. [ Last edited by zhangfangzhi on 2009-10-10 at 16:44 ] |
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zhangfangzhi
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In the absence of chain transfer (to solvent, initiator, or monomer), the total number of chains formed will be equal to (or less than) the moles of dithio compound employed plus the moles of initiator-derived radicals generated during the course of the polymerization. In block synthesis, these additional initiator-derived chains are a source of homopolymer impurity. The level of impurities can be controlled by appropriate selection of the reaction conditions.14 For maximum purity, it is desirable to use as low a concentration of initiator as practicable and to choose solvents and initiators which give minimal chain transfer. As with conventional radical polymerization, the rate of RAFT polymerization is determined by the initiator concentration. In practice, it is usually not difficult to achieve block copolymers with no detectable homopolymer impurity (<5%) while still achieving an acceptable rate of polymerization. |
9楼2009-10-11 13:46:23
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2楼2009-10-10 16:06:32
zhangfangzhi
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3楼2009-10-10 16:31:35
zhangfangzhi
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4楼2009-10-10 16:34:34
