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使用硼氢化钠/氯化钐还原端羧基氟弹性体

Reduction of liquid terminated-carboxyl fluoroelastomers using NaBH/SmCl.

作者信息

Chang Yunfei, Liao Mingyi, Li Xueyan

机构信息

College of Transportation Engineering, Dalian Maritime University No. 1 Linghai Road Dalian 116026 China

出版信息

RSC Adv. 2020 Mar 17;10(18):10932-10938. doi: 10.1039/c9ra10069e. eCollection 2020 Mar 11.

DOI:10.1039/c9ra10069e
PMID:35492900
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9050475/
Abstract

Using a simple one-pot method, the reduction of liquid terminated-carboxyl fluoroelastomers (LTCFs) by sodium borohydride and samarium chloride (NaBH/SmCl) was successfully realized and liquid terminated-hydroxyl fluoroelastomers (LTHFs) were obtained. The structure and functional group content of LTCFs and LTHFs were analyzed by FTIR, H-NMR, F-NMR and chemical titration. The results showed that -C[double bond, length as m-dash]C- and carboxyl groups of LTCFs were reduced efficiently, the reduction rate reached 92% under optimum reaction conditions. Compared with other frequently-used metal chlorides, SmCl with a high coordination number could increase the reduction activity of NaBH more effectively and the reduction mechanism was explored.

摘要

采用简单的一锅法，成功实现了硼氢化钠和氯化钐（NaBH₄/SmCl₃）对端羧基液体氟橡胶（LTCFs）的还原，得到了端羟基液体氟橡胶（LTHFs）。通过傅里叶变换红外光谱（FTIR）、氢核磁共振（¹H-NMR）、氟核磁共振（¹⁹F-NMR）和化学滴定法对LTCFs和LTHFs的结构和官能团含量进行了分析。结果表明，LTCFs的-C≡C-键和羧基被有效还原，在最佳反应条件下还原率达到92%。与其他常用金属氯化物相比，具有高配位数的SmCl₃能更有效地提高NaBH₄的还原活性，并对还原机理进行了探讨。

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