基于香兰素的聚合物:V.Poly(氢化香兰素-氨基甲酸酯)

Q2 Materials Science
A. Amarasekara, Rocio Garcia-Obregon
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引用次数: 2

摘要

在NaOH水溶液中,通过香兰素的电化学二聚反应,以86%的产率合成了可再生资源基氢香兰素[1,2-双(4-羟基-3-甲氧基苯基)-1,2-乙二醇]。然后通过两种不同的方法将这种对称的双酚单体用于制备氨基甲酸酯聚合物。在第一种方法中,使用1,4-二氮杂双环[2,2,2]辛烷作为催化剂,在60°C下,在DMF中聚合氢香兰素和二异氰酸酯的1:2摩尔比混合物1小时,得到聚(氢香兰醇-氨基甲酸酯)s。在第二种方法中,二异氰酸酯首先与聚乙二醇-400反应,得到预聚物。然后将预聚物与等量的氢香兰素在60°C下反应4天,制备聚(氢香兰醇乙二醇氨基甲酸酯)。第一种方法得到的硬聚(氢化香草精-氨基甲酸酯)的Tg值在121–172°C范围内。第二种方法产生了较软的聚(氢香兰素乙二醇氨基甲酸酯),并且这些聚合物在DSC分析中没有显示出不同的玻璃化转变温度。然而,聚(氢香兰素乙二醇氨基甲酸酯)表现出比没有聚乙二醇单元的聚合物更好的热稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Vanillin based polymers: V. Poly(hydrovanilloin–urethane)
Renewable resources based hydrovanilloin [1,2-bis(4-hydroxy-3-methoxyphenyl)-1,2-ethanediol] was synthesized in 86% yield by electrochemical dimerization of vanillin in aqueous NaOH. This symmetrical bis-phenol monomer was then used for the preparation of urethane polymers by two different methods. In the first method a 1:2 mole ratio mixture of hydrovanilloin and diisocyanate was polymerized in DMF using 1,4-diazabicyclo[2,2,2]octane as the catalyst at 60°C, for 1 h to give poly(hydrovanilloin–urethane)s. In the second method diisocyanates were first reacted with polyethylene glycol-400 to give pre-polymers. Then prepolymers were reacted with equivalent amount of hydrovanilloin at 60°C for 4 days to produce poly(hydrovanilloin-ethylene glycol-urethane)s. The first method resulted hard poly(hydrovanilloin–urethane)s showing Tg values in the range of 121–172°C. The second method yielded softer poly(hydrovanilloin-ethylene glycol-urethane)s and these polymers failed to show distinct glass transition temperatures in the DSC analysis. However, poly(hydrovanilloin-ethylene glycol-urethane)s showed better thermal stabilities than polymers without polyethylene glycol units.
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来源期刊
Polymers from Renewable Resources
Polymers from Renewable Resources Materials Science-Polymers and Plastics
CiteScore
3.50
自引率
0.00%
发文量
15
期刊介绍: Polymers from Renewable Resources, launched in 2010, publishes leading peer reviewed research that is focused on the development of renewable polymers and their application in the production of industrial, consumer, and medical products. The progressive decline of fossil resources, together with the ongoing increases in oil prices, has initiated an increase in the search for alternatives based on renewable resources for the production of energy. The prevalence of petroleum and carbon based chemistry for the production of organic chemical goods has generated a variety of initiatives aimed at replacing fossil sources with renewable counterparts. In particular, major efforts are being conducted in polymer science and technology to prepare macromolecular materials based on renewable resources. Also gaining momentum is the utilisation of vegetable biomass either by the separation of its components and their development or after suitable chemical modification. This journal is a valuable addition to academic, research and industrial libraries, research institutions dealing with the use of natural resources and materials science and industrial laboratories concerned with polymer science.
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