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[½»Á÷] ¡¾ÌÖÂÛ¡¿RAFT Ä©¶Ë²»´øÁò´úôÊ»ùµÄËÀ¾ÛºÏÎïÁ´ÓжàÉÙ

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Ezio Rizzardo˵£¬
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

ľ³æ (Ö°Òµ×÷¼Ò)

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.
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