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Integrating ricinoleic acid derivates to thermoset polymers with tunable properties
Polymer International ( IF 2.9 ) Pub Date : 2021-02-05 , DOI: 10.1002/pi.6200
Emanuel Hernández 1 , Norma. E. Marcovich 1 , Mirna. A. Mosiewicki 1
Affiliation  

A highly functionalized biobased derivative of ricinoleic acid (MMRA) was synthesized through a two-step procedure: maleinization of the hydroxyl group naturally present in this fatty acid followed by methacrylation of the carboxylic acid groups. The chemical structure of MMRA was confirmed by 1H NMR, infrared spectroscopy, gel permeation chromatography and analytical determinations. Thermoset polymers were further obtained by the free radical polymerization of MMRA with different amounts of styrene. The dependence of the color/transparency and tensile properties on sample composition was evaluated. Moreover, thermogravimetric and dynamic mechanical analyses were carried out to further characterize the obtained materials. All polymers were highly translucent with lightness values in the range 87.4–90.8 and opacity values below 13%. Their glass transition temperatures (Tg) ranged from 61.5 °C for the homopolymer MMRA to 104 °C for the copolymer containing 30 wt% MMRA. The rubbery storage modulus increased with MMRA content confirming the high functionality of the green precursor that led to polymers with high crosslinking density. Notably, pronounced damping capacity was also found in all copolymers made from MMRA / styrene. © 2021 Society of Chemical Industry

中文翻译:

将蓖麻油酸衍生物整合到具有可调特性的热固性聚合物中

蓖麻油酸 (MMRA) 的高度官能化生物基衍生物通过两步程序合成:天然存在于该脂肪酸中的羟基的马来酸化,然后是羧酸基团的甲基丙烯酸化。MMRA 的化学结构由1H NMR、红外光谱、凝胶渗透色谱和分析测定。通过MMRA与不同量苯乙烯的自由基聚合进一步获得热固性聚合物。评估了颜色/透明度和拉伸性能对样品组成的依赖性。此外,还进行了热重和动态力学分析以进一步表征所获得的材料。所有聚合物都是高度半透明的,亮度值在 87.4-90.8 之间,不透明度值低于 13%。它们的玻璃化转变温度 ( T g) 范围从 MMRA 均聚物的 61.5 °C 到含有 30 wt% MMRA 的共聚物的 104 °C。橡胶储能模量随着 MMRA 含量的增加而增加,证实了绿色前体的高功能性,这导致聚合物具有高交联密度。值得注意的是,在所有由 MMRA/苯乙烯制成的共聚物中也发现了显着的阻尼能力。© 2021 化学工业协会
更新日期:2021-02-05
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