標題: Hyperbranched aromatic poly(ether imide)s: Synthesis, characterization, and modification
作者: Wu, FI
Shu, CF
應用化學系
Department of Applied Chemistry
關鍵字: hyperbranched;poly(ether imide)s;AR(2) monomer;degree of branching
公開日期: 15-Jul-2001
摘要: The synthesis and characterization of hyperbranched aromatic poly(ether imide)s are described. An AB, monomer, which contained a pair of phenolic groups and an aryl fluoro moiety activated toward displacement by the attached imide heterocyclic ring, was prepared. The nucleophilic substitution of the fluoride with the phenolate groups led to the formation of an ether linkage and, subsequently, to the hyperbranched poly(ether imide), which contained terminal phenolic groups. A similar one-step polymerization involving a monomer that contained silyl-protected phenols yielded a hyperbranched poly(ether imide) with terminal silylated phenols. The degree of branching of these hyperbranched polymers was approximately 55%, as determined by a combination of model compound studies and H-1 NMR integration experiments. End-capping reactions of the terminal phenolic groups were readily accomplished with a variety of acid chlorides and acid anhydrides. The nature of the chain-end groups significantly influenced physical properties, such as the glass-transition temperature and the solubility of the hyperbranched poly(ether imide)s. As the length of the acyl chain of the terminal ester groups increased, the glass-transition temperature value for the polymer decreased, and the solubility of the polymer in polar solvents was reduced, becoming more soluble in nonpolar solvents. (C) 2001 John Wiley & Sons, Inc.
URI: http://dx.doi.org/10.1002/pola.1230
http://hdl.handle.net/11536/29503
ISSN: 0887-624X
DOI: 10.1002/pola.1230
期刊: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume: 39
Issue: 14
起始頁: 2536
結束頁: 2546
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