Abstract:

Poly(vinlytetrazole-co-acrylonitrile)(Poly(VT-co-AN)) was synthesized via partial [3+2] cyclization of the cyano group of polyacrylonitrile, and then hydrolysis of the residual cyano group in basic condition leads to poly(vinyltetrazole-co-acrylic acid)( Poly(VT-co-AA)). The structures of Poly(VT-co-AA) and Poly(VT-co-AN) are characterized by FT-IR and ¹³C NMR. The results show that poly(VT-co-AN) contains tetrazole, cyano and carboxyl group, and the tetrazole content is 68.6%, which corresponds to the result of acid-base titration. The Poly(VT-co-AA) contains tetrazole and carboxyl group, and shows a higher acid value than Poly(VT-co-AN). The tetrazole content of Poly(VT-co-AA) is 67.6% and corresponds to the n(NaN₃)/n(PAN) ratio. Thermogravimetric analysis result shows that Poly(VT-co-AA) decomposes faster, and decomposes fully in 270~285 ℃.

Key words: poly(vinyltetrazole-co-acrylic acid), polyacrylonitrile, [3+2] cyclizaction, basic hydrolysis reaction