Synthesis of well-defined hyperbranched polymers bio-based on multifunctional phenolic acids and their structure-thermal property relationships

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• 作者：Siqian Wang ; Seiji Tateyama ; Daisaku Kaneko ; Shin-ya Ohki ; Tatsuo Kaneko ; ^{kaneko@jaist.ac.jp}
• 关键词：Hyperbranched polymers ; Bio-based polymers ; Biomimetics ; Polyarylates ; NMR analyses
• 刊名：Polymer Degradation and Stability
• 出版年：2011
• 出版时间：December, 2011
• 年：2011
• 卷：96
• 期：12
• 页码：2048-2054
• 全文大小：1K

文摘

A number of multifunctional ABx-type monomers exist in plant metabolites, and studies on the formation of hyperbranching polymers from ABx-type monomers are very significant in the development of bio-related polymeric materials. We established a method for the preparation of well-defined structures in bio-based, hyperbranched (HB) polyarylates by the copolycondensation of caffeic acid (DHCA) as an AB₂-monomer and p-coumaric acid (4HCA) as an AB-monomer, using the highly efficient catalyst Na₂HPO₄ to regulate the polymerization speed. ¹H NMR analysis revealed the time course of the formation of the hyperbranching structures. which strongly affected the glass transition and degradation temperatures, as well as the molecular weight and composition.