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首页> 外文期刊>RSC Advances >Improving thermal and mechanical properties of biomass-based polymers using structurally ordered polyesters from ricinoleic acid and 4-hydroxycinnamic acids
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Improving thermal and mechanical properties of biomass-based polymers using structurally ordered polyesters from ricinoleic acid and 4-hydroxycinnamic acids

机译：使用来自蓖麻油酸和4-羟基氨基酸的结构有序的聚酯改善生物质基聚合物的热和力学性能

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摘要

Biomass-based copolymers with alternating ricinoleic acid and 4-hydroxycinnamic acid derivatives ( p -coumaric acid, ferulic acid, and sinapinic acid) exhibit a repeating structure based on soft and hard segments, derived from ricinoleic and 4-hydroxycinnamic acids, respectively. To achieve this alternating sequence, copolymers were synthesised by the self-condensation of hetero-dimeric monomers derived by the pre-coupling of methyl ricinolate and 4-hydroxycinnamic acid. The glass transition temperature ( T _(g) ) was observed to increase as the number of methoxy groups on the main chain increased; the T _(g) values of poly(coumaric acid- alt -ricinoleic acid), poly(ferulic acid- alt -ricinoleic acid), and poly(sinapinic acid- alt -ricinoleic acid) are ?15 °C, ?4 °C, and 24 °C respectively, 58 °C, 69 °C, and 97 °C higher than that of poly(ricinoleic acid). The polymers were processed into highly flexible, visually transparent films. Among them, poly(sinapinic acid- alt -ricinoleic acid) bearing two methoxy groups on each cinnamoyl unit, is mechanically the strongest polymer, with an elastic modulus of 126.5 MPa and a tensile strength at break of 15.47 MPa.
机译：具有交替的蓖麻油酸和4-羟基氨基酸衍生物（P-COUMARIC酸，阿魏酸和SINAPINIC酸）的生物质基共聚物表现出基于源自蓖麻油和4-羟基氨基酸的软和硬链段的重复结构。为了实现这种交替序列，通过通过甲基氯酸甲酯和4-羟基氨基酸的预偶联的杂种 - 二聚体单体的自凝聚来合成共聚物。观察到玻璃化转变温度（T _（g））随着主链上的甲氧基的数量增加而增加;聚（香豆酸 - Alt-ricial酸），聚（阿族酸 - Alt-ricalion酸）的T _（g）值，以及聚（锡丁酸 - Alt-ricinoleic酸）是α15℃，？4° C，24℃，58℃，69℃和97℃高于聚（蓖麻油酸）。将聚合物加工成高度柔韧的视觉透明薄膜。其中，携带两种甲氧基在每种肉桂酰单元上的聚（锡碱酸 - 醇酸）是机械的最强聚合物，弹性模量为126.5MPa，突破15.47MPa的拉伸强度。

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