COPOLYMERS OF FLUORINATED 2-CYANOACRYLATE S WITH 1,1,2-TRICHLOROBUTADIENE-1,3

The copolymerization of fluorinated 2-cyanoacrylates and 1,1,2-trichlo robutadiene (TCB) in the presence of radical initiators was studied in benzene solutions and in bulk. The Mayo-Lewis method was used to calc ulate the reactivity ratios for 1,1,3-trihydrotetrafluoropropyl-2-cyan oacrylate (FPCA) and TCB at low conversions (r(FPCA) = 0.73, r(TCB) = 1.16) The structure of copolymers was studied by H-1 and C-13 NMR spec troscopy. The FPCA-TCB copolymer has a structure with a normal head-to -tail addition, The structure of copolymer units is similar to that of the corresponding homopolymers. The FPCA-rich copolymers contain isot actic sequences of the FPCA units. The structure of the TCB units is t ypical of 1,4-addition.