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首页> 外文期刊>Journal of Applied Polymer Science >Thermal stability and degradation of biological terpolyesters over a broad temperature range
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Thermal stability and degradation of biological terpolyesters over a broad temperature range

机译：宽温度范围内生物三聚酯的热稳定性和降解

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摘要

Because of high susceptibility to thermal degradation during conventional melt processing of poly(3-hydroxybutyrate) (P3HB) homopolymer, incorporation of a second or third monomer unit in the polyester backbones is expected to reduce the melting temperature and crystallinity, resulting in a controlled thermal degradation with improved stability. In this work, random poly(3-hydroxybutyrate-co-3-hydroxyvalerate-co-4-hydroxyvalerate) (P3HB3HV4HV) terpolyesters biologically synthesized by Cupriavidus necator were investigated for the thermal stability and degradation over a broad temperature range (100-300 degrees C) in comparison with P3HB homopolyester. The work revealed that below the complete melting point (around 150 degrees C), the terpolyester exhibited a high thermal stability and became an amorphous semisolid suitable for conventional thermal processing. Size exclusion chromatography plus nuclear magnetic resonance analysis was used to examine the thermal degradation products and the vulnerability of different monomer units at high temperatures (240-290 degrees C). We found that 3HV unit in P3HB3HV4HV copolymers was more vulnerable to thermal degradation than 3HB unit under air. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41715.
机译：由于在聚（3-羟基丁酸酯）（P3HB）均聚物的常规熔融加工过程中对热降解的敏感性很高，因此在聚酯主链中引入第二或第三单体单元可降低熔融温度和结晶度，从而控制热降解，提高稳定性。在这项工作中，研究了由铜氧化铜（Cupriavidus necator）生物合成的无规聚（3-羟基丁酸酯-co-3-羟基戊酸酯-co-4-羟基戊酸酯）（P3HB3HV4HV）三元聚酯在宽温度范围内（100-300度）的热稳定性和降解性。 C）与P3HB均聚酯相比。这项工作表明，在完全熔点（约150摄氏度）以下，三元聚酯表现出高的热稳定性，并成为适合常规热处理的非晶态半固体。尺寸排阻色谱加核磁共振分析被用来检查热降解产物以及高温（240-290摄氏度）不同单体单元的脆弱性。我们发现，在空气中，P3HB3HV4HV共聚物中的3HV单元比3HB单元更容易受到热降解。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41715。

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