期刊
POLYMER JOURNAL
卷 44, 期 1, 页码 14-29出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/pj.2011.99
关键词
controlled synthesis; degree of branching; hyperbranched polymer; polycondensation; super acid
资金
- Yoshida Scholarship Foundation
Hyperbranched polymers (HBPs) have attracted considerable attention during the past decade because of their intrinsic globular structures and unique properties, such as low viscosity, high solubility and a high degree of functionality, compared with linear analogs. As HBPs are generally prepared by one-pot polycondensation of an AB(x) monomer, where A and B represent two different functional groups, they are regarded as less-expensive alternatives to dendrimers. However, HBPs have randomly branched structures and their degree of branching (DB) is determined by statistics and only reaches similar to 50%. Recently, several research groups have successfully synthesized a 100% DB without any defect mainly by condensation or addition reactions. These methods are based on a new concept in which the ratio of the rate constants, the first reaction rate constant (k(1))/the second reaction rate constant (k(2)) of an AB(2) monomer, can be controlled. Recent development in the synthesis of a linear polymer, that is, a 0% DB HBP, from an AB(2) monomer could make it possible to further precisely control the DB from 0 to 100% by using the same AB(2) monomer. In this review article, the backgrounds and methodologies for controlling the DB are described, especially focusing on recent advances in the synthesis of HBPs with a DB of 100, 0% and any percentage between 0 and 100%. Polymer Journal (2012) 44, 14-29; doi:10.1038/pj.2011.99; published online 19 October 2011
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