Tracing Arm-Growth Initiation in Z-RAFT Star Polymerization by NMR: The Impact of the Leaving R-Group on Star Topology

被引:26
作者
Boschmann, Daniel [1 ]
Maenz, Martin [1 ]
Poeppler, Ann-Christin [1 ]
Soerensen, Nicolai [1 ]
Vana, Philipp [1 ]
机构
[1] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany
关键词
living radical polymerization; NMR; radical polymerization; reversible addition-fragmentation chain transfer (RAFT); star polymers;
D O I
10.1002/pola.23032
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Arm-growth initiation in six-armed Z-RAFT star polymerization of styrene-d(8) was followed via the disappearance of H-1 NMR signals of the leaving group at their original position. These measurements revealed a dramatic impact of the leaving group on star polymer topology. Phenylethyl as leaving group induced formation of completely initiated stars already after 8% of monomer conversion. Benzyl as leaving group, however, drastically slows down arm-growth initiation, resulting in fully initiated star polymers only after about 60% of monomer conversion. Below that value, star-polystyrene of the expected topology cannot be generated with benzyl as leaving group. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.] Published online 25 September 2008
引用
收藏
页码:7280 / +
页数:8
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