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Synthesis of Highly Branched Comblike Polymers Having One Branch in Each Repeating Unit by Linking Reaction of Polystyryllithium with Well‐Defined New Epoxy‐Functionalized Polystyrene
Author(s) -
Hirao Akira,
Shimohara Norihide,
Ryu Sang Woo,
Sugiyama Kenji
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200451302
Subject(s) - epoxy , polystyrene , polymer , materials science , polymer chemistry , molecular mass , chemistry , organic chemistry , composite material , enzyme
Highly branched comblike polymers having one branch in each repeating unit were successfully synthesized by the linking reaction of polystyryllithium (PSLi) with new epoxy‐functionalized polystyrenes, poly(4‐(3,4‐epoxybutyl)styrenes, ( 1 ). The reaction of PSLi with 1 proceeded very fast to reach 88 % efficiency after 1 h and was complete within 24 h under the conditions in THF at −78 °C. A high molecular weight PSLi ( M w = 56.2 kg/mol) could be completely reacted with 1 ( M w = 8.36 kg/mol) to introduce into each of all epoxy reaction sites. However, the linking efficiency decreased with increasing the molecular weights of PSLi and especially 1 . With use of a high molecular weight 1 ( M w = 71.8 kg/mol), even a low molecular weight PSLi ( M w = 4.28 kg/mol) could not be quantitatively introduced into all epoxy functions, although a high efficiency of 88 % was achieved. The influence of both molecular weights on linking efficiency was examined in detail.