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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical and Thermal Properties of Thermoplastic Random Copolyesters Made from Lipid-Derived Medium and Long Chain Poly(ω-hydroxyfatty acid)s
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Mechanical and Thermal Properties of Thermoplastic Random Copolyesters Made from Lipid-Derived Medium and Long Chain Poly(ω-hydroxyfatty acid)s

机译：脂质衍生的中链和长链聚（ω-羟基脂肪酸）制成的热塑性无规共聚酯的机械和热性能

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摘要

The physical properties of novel thermoplastic random copolyesters [-(CH_2)_n-COO-/-(CH_2)_n-COO-]_x made of long (n=12) and medium (n=8) chain length ω-hydroxyfatty esters [HO-(CH_2)_n-COOCH_3] derived from bio-based vegetable oil feedstock are described. Poly(ω-hydroxy tridecanoate/ω-hydroxy nonanoate) P(-M-13-/-M-9-) random copolyesters (M_n=11,000–18,500 g/mol) with varying molar ratios were examined by TGA, DSC, DMA and tensile analysis, and WAXD. For the whole range of P(-M-13-/-M-9-) compositions, the WAXD data indicated an orthorhombic polyethylene-like crystal packing. Their melting characteristics, determined by DSC, varied with composition suggesting an isomorphic cocrystallization behavior. TGA of the P(-M-13-/-M-9-)s indicated improved thermal stability determined by their molar compositions. The glass transition temperature, investigated by DMA, was also found to vary with composition. The crystallinities of P(-M-13-/-M-9-)s however, were unaffected by the composition. The stiffness (Young's modulus) of these materials was found to be related to their degrees of crystallinity.
机译：新型热塑性无规共聚酯[-（CH_2）_n-COO-/-（CH_2）_n-COO-] _ x由长（n = 12）和中等（n = 8）链长的ω-羟基脂肪酸酯[描述了源自生物基植物油原料的HO-（CH_2）_n-COOCH_3]。通过TGA，DSC，DMA检查了摩尔比不同的聚（ω-羟基十三烷酸酯/ω-羟基壬酸酯）P（-M-13-/-M-9-）无规共聚酯（M_n = 11,000–18,500 g / mol）拉伸分析和WAXD。对于整个P（-M-13-/-M-9-）组合物，WAXD数据显示出正交晶的聚乙烯样晶体堆积。由DSC测定的它们的熔融特性随组成变化而变化，表明同晶共结晶行为。 P（-M-13-/-M-9-）的TGA表明由其摩尔组成确定的改善的热稳定性。还发现通过DMA研究的玻璃化转变温度随组成而变化。然而，P（-M-13-/-M-9-）的结晶度不受组成的影响。发现这些材料的刚度（杨氏模量）与它们的结晶度有关。

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