## 1 Introduction
The reaction mixture was diluted with DMA and the solution was precipitated twice into an acetone\(-\)ethanol mixture. The precipitate formed was centrifuged at 5000 rpm for 10 min and dried in vacuo at 50 \({}^{\circ}\)C for 24 h. The copolymers were white powders. By varying the ratio of VT and VK monomers in the initial reaction mixture from 93:7, 85:15, and 70:30 mol. % (Table 1), three different compositions of copolymers were obtained. The yield was 91-94%. Synthesis of poly(VT-\(co\)-VK) P1: The reaction mixture: VT (0.87 g, 3 mol/L), VK (0.13 g, 43 mol/L), AIBN (17.7 mg, 0.03 mol/L), DMA (3.06 g). Yield: 0.94 g, 94%. FT-IR: \(\
u\) = 747 cm\({}^{-1}\) (\(-\)CH-CH\({}_{2}\)), 1222 cm\({}^{-1}\) (C=CH\({}_{2}\)), 1334 cm\({}^{-1}\) (C=N), 1452 cm\({}^{-1}\) (\(-\)CH), 1485 cm\({}^{-1}\) (\(-\)C=C-) for VK; 661 cm\({}^{-1}\) (C=N), 1004 cm\({}^{-1}\) (C=-H), 1140 (C=-H), 1276 cm\({}^{-1}\) (N=N), 1434 cm\({}^{-1}\) (C=N); 1505 cm\({}^{-1}\) (C=N) for triazole ring; 2934 cm\({}^{-1}\) (CH\({}_{2}\)), 3110 cm\({}^{-1}\) (C=-H) for polymer chain. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\)): 8 = 1.40-2.25 (br, 2H, CH\({}_{2}\) in the polymer main chain), 2.6 -4.15 (br, 1H, \(>\)CH- in the polymer main chain), 7.50-8.15 ppm (br, 2H, triazole ring), 7.50-8.15 ppm (br, 8H, carbazole ring). Synthesis of poly(VT-\(co\)-VK) P2: The reaction mixture: VT (0.74 g, 3 mol/L), VK (0.26 g, 43 mol/L), AIBN (17.7 mg, 0.03 mol/L), DMA (2.80 g). Yield: 0.93 g, 93%. FT-IR: \(\
u\) = 745 cm\({}^{-1}\) (\(-\)CH=CH\({}_{2}\)), 1222 cm\({}^{-1}\) (C=CH\({}_{2}\)), 1334 cm\({}^{-1}\) (C=N), 1452 cm\({}^{-1}\) (\(-\)CH), 1483 cm\({}^{-1}\) (\(-\)C=C-) for VK; 661 cm\({}^{-1}\) (C=N), 1003 cm\({}^{-1}\) (C=-H), 1140 (C=-H), 1276 cm\({}^{-1}\) (N=N), 1434 cm\({}^{-1}\) (C=N), 1504 cm\({}^{-1}\) (C=N) for triazole ring; 2933 cm\({}^{-1}\) (CH\({}_{2}\)), 3112 cm\({}^{-1}\) (C=H) for polymer chain. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\)): 8 = 1.40-2.25 (br, 2H, CH\({}_{2}\) in the polymer main chain), 2.6 -4.15 (br, 1H, \(>\)CH- in the polymer main chain), 7.50-8.15 ppm (br, 2H, triazole ring), 7.50-8.15 ppm (br, 8H, carbazole ring). Synthesis of poly(VT-\(co\)-VK) P3: The reaction mixture: VT (0.54 g, 3 mol/L), VK (0.47 g, 43 mol/L), AIBN (17.7 mg, 0.03 mol/L), DMA (2.34 g). Yield: 0.91 g, 91%. FT-IR: \(\
u\) = 744 cm\({}^{-1}\) (\(-\)CH=CH\({}_{2}\)), 1224 cm\({}^{-1}\) (C=CH\({}_{2}\)), 1333 cm\({}^{-1}\) (C=N), 1452 cm\({}^{-1}\) (\(-\)CH), 1483 cm\({}^{-1}\) (\(-\)C=C-) for VK; 662 cm\({}^{-1}\) (C=N), 1003 cm\({}^{-1}\) (C=-H), 1139 (C=-H), 1275 cm\({}^{-1}\) \begin{table}
\begin{tabular}{c c c c c c c c} \hline \multirow{3}{*}{**Copolymer**} & \multicolumn{3}{c}{**Composition of the Initial**} & \multicolumn{3}{c}{**Composition of the**} & \multirow{3}{*}{**Mw, kDa**} & \multirow{3}{*}{**\(D\) = Mw/Mn**} \\ \cline{3-3} \cline{5-8}  & **Mixture Commoners, mol. \%** & & & **Copolymer, mol. \%** & & \\ \cline{2-8}  & **VT** & **VK** & & **VT** & **VK** & & \\ \hline P1 & 93 & 7 & 94 & 91 & 9 & 201 & 1.77 \\ P2 & 85 & 15 & 93 & 84 & 16 & 191 & 1.76 \\ P3 & 70 & 30 & 91 & 63 & 37 & 175 & 1.79 \\ \hline \end{tabular}
\end{table} 
Table 1: Copolymerization conditions and characteristics of P1–P3 poly(VT-\(co\)–VK) copolymers (\(C_{\rm AIBN}\) = 3 \(\times\) 10\({}^{-2}\) mol/L, 60 \({}^{\circ}\)C). (N-N), 1434 cm\({}^{-1}\) (C-N), 1503 cm\({}^{-1}\) (C=N) foriazole ring; 2932 cm\({}^{-1}\) (CH\({}_{2}\)), 3114 cm\({}^{-1}\) (C-H) for polymer chain. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\)): \(\delta\) = 1.40-2.25 (br, 2H, CH\({}_{2}\) in the polymer main chain), 2.6 - 4.15 (br, 1H, \(>\)CH- in the polymer main chain), 7.50-8.15 ppm (br, 2H, triazole ring), 7.50-8.15 ppm (br, 8H, carbazole ring). Instrumentation  
\({}^{1}\)H NMR (400.13 MHz) spectra were recorded with a Bruker DPX-400 spectrometer at room temperature. The FT-IR spectra were recorded using a Varian 3100 FTIR spectrometer (Palo Alto, Santa Clara, CA, USA).