基于香草酸的可再生聚酯的合成与表征,Journal of Applied Polymer Science

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基于香草酸的可再生聚酯的合成与表征
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-03-10 , DOI: 10.1002/app.49189
Silong Zhang ₁ , Zhengzai Cheng ₁ , Sheng Zeng ₂ , Guangyao Li ₃ , Jing Xiong ₃ , Ling Ding ₁ , Mario Gauthier ₄

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可能来源于生物原料的香草酸被用作合成新型聚酯的原料。通过将香草酸酯化和醚化制得的二酯与间苯二酚双（2-羟乙基）醚，对苯二酚双（2-羟乙基）醚或碳链长度不同的脂肪族二醇作为第二单体和锑结合使用用三氧化物作为催化剂，通过熔融聚合反应合成一系列聚酯。所得材料的聚苯乙烯换算M _n = 10,000–19,500 g / mol，M _w = 19,300–39,500 g / mol。热分析，得到熔点为76-114℃的温度和起始分解温度Ť _5％= 321–360°C。动态机械和拉伸试验证实，衍生自香草酸的聚酯具有优于聚对苯二甲酸乙二醇酯（PET）的性能。在16周内使用不同pH值的大块聚酯样品进行的水降解实验导致特性粘度在中性条件下（pH 7）降低9–23％，在酸性条件下（pH 3）降低10–26％，在碱性条件下降低7–19％条件（pH 12）。获得的结果表明，基于香草酸的聚酯具有良好的热稳定性和可降解性，并且通过选择合成中所用的二醇单体，这些材料的性能可调节性，使其成为商业聚酯如PET的极佳生物来源替代品。

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Synthesis and characterization of renewable polyesters based on vanillic acid

Vanillic acid, potentially derived from biosourced feedstocks, was used as starting material in the synthesis of novel polyesters. A diester obtained by esterification and etherification of vanillic acid served as first monomer, in combination with resorcinol bis(2‐hydroxyethyl) ether, hydroquinone bis(2‐hydroxyethyl) ether, or aliphatic diols with different carbon chain lengths as second monomers, and antimony trioxide as catalyst to synthesize a series of polyesters by melt polymerization. The materials obtained had polystyrene‐equivalent M _n = 10,000–19,500 g/mol and M _w = 19,300–39,500 g/mol. Thermal analysis yielded melting temperatures of 76–114°C and onset decomposition temperatures T _5% = 321–360°C. Dynamic mechanical and tensile testing confirmed that polyesters derived from vanillic acid have properties superior to poly(ethylene terephthalate) (PET). Aqueous degradation experiments with bulk polyester samples at different pH over 16 weeks led to intrinsic viscosity decreases of 9–23% under neutral conditions (pH 7), 10–26% under acidic conditions (pH 3), and 7–19% under alkaline conditions (pH 12). The results obtained show that the good thermal stability and degradability of vanillic acid‐based polyesters, and the tunability of the properties of these materials through selection of the diol monomer used in their synthesis, make them excellent biosourced replacements for commercial polyesters such as PET.

更新日期：2020-03-10

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