通过硫醇-烯点击反应将正十二硫醇接枝到蓖麻油中,成功合成了一种含有大量支链的蓖麻油(MCO)。以蓖麻油(MCO)为软段、二苯基甲烷二异氰酸酯(MDI50)为硬段、乙二醇(EG)为扩链剂合成生物基聚氨酯。通过核磁共振氢谱(¹HNMR)和傅里叶变换光谱(FT-IR)对其进行表征。动态力学分析(DMA)结果表明,随着正十二硫醇接枝量的增加,蓖麻油基聚氨酯有效阻尼温域由34.3℃(17.1~51.4℃)提高到74℃(-8.3~65.7℃),阻尼温域大幅提高,同时阻尼温域向低温方向移动了25.4℃,有效覆盖了阻尼材料的使用温度,拓展了材料的使用环境和应用领域。

Castor oil (MCO) containing a large number of branched chains is successfully synthesized through grafting n-dodecanethiol into castor oil via a thiol-ene click reaction.Furthermore,bio-based polyurethane is synthesized by taking MCO as the soft segment,diphenylmethane diisocyanate (MDI50) as the hard segment,and ethylene glycol as the chain extender.Characterization by hydrogen nuclear magnetic resonance spectroscopy (¹H-NMR) and Fourier transform spectroscopy (FT-IR) reveals the successful synthesis of biobased polyurethanes.Dynamic mechanical analysis (DMA) results show that with the increase of the grafting amount of n-dodecanethiol,the effective damping temperature range of castor oil-based polyurethane increases from 34.3℃(17.1-51.4℃) to 74℃(-8.3-65.7℃).The damping temperature range is greatly improved,and moves towards low temperature direction by 25.4℃,which effectively covers the use temperature of the damping material and expands the use environment and application field of the material.

任凯(1993-),男,硕士研究生,主要从事聚氨酯阻尼材料的研究,rk993765391@163.com。