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橡塑技术与装备（橡胶） CHINA RUBBER/PLASTICS TECHNOLOGY AND EQUIPMENT (Rubber)

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Study on the synthesis of liquid terminal acylfluorine rubber from
different acylated reagents

Li Donghan, Liao Mingyi
(Dalian Maritime University, Dalian 116026, Liaoning, China)

Abstract: Using liquid carboxyl terminated fluoro rubber as raw material, liquid terminal chloride based
fluoro rubber was synthesized by functional group conversion method. Selecting the SOCl 2 and (COCl) 2
as acylating reagent, pyridine and N, N-dimethyl formamide (DMF) and triethylamine (TEA) as catalyst,
conducting system research for the reaction conditions, catalysts and the variety and dosage of acylating
reagent. The structure and end group conversion rate were analyzed and tested by adopting FTIR and
19 F-NMR. The results showed that the synthesis of liquid terminal acyl chlorofluoro rubber could be achieved
by both acylation reagents. The -COCl stretching vibration peak appeared at 1795cm-1 in the product FTIR
19
spectrum, and the -CF 2 COCl characteristic peak appeared at -102.54×10 in F-NMR spectrum. When SOCl 2
-6
was as acylation reagent, the reaction temperature, type and amount of catalyst have a great influence
on the end group conversion rate. The reaction time and the amount of SOCl 2 have little effect on the end
group conversion rate, and the conversion of carboxyl group can reach as high as 86%. When the (COCl) 2

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