Polytriazole preparation

The action of diamines or aminotriazoles on 1,3,4-oxadiazoIes (Scheme 100) is a synthetic route to bistriazoles such as (219) and (220) (68JPR(309)168). Bistriazole (221) formation combined with alkylation of the resulting triazolinone (c/. Scheme 95) can make use of glycols instead of monohydric alcohols (68KGS372) as in Scheme 101. Related polytriazoles with aromatic links have also been prepared (81HC(37)1, p. 576). 

Finally, mention should be made of polytriazoles formed by 1,3-addition reactions of dicyanides with bisnitrilimines conveniently generated from bistetrazoles. The polymers prepared from 1,3-dicyanohexafluoropropane were thermally stable but had a low degree of polymerization. 

Hensema ER, Boom JP, Mulder MHV, Smolders C A. Two reaction routes for the preparation of aromatic polyoxadiazoles and polytriazoles syntheses and properties. J Polym Sci Part A Polym Chem 1994 32(3) 513-25. 

Crosslinkable polytriazole resins have been prepared by prepolymerization of multifunctional azides with multifunctional alkynes. A variety of multifunctional azide (A. or A., i = 2, 3) and alkyne monomers (Bj, j = 3,4 or B. j = 2, k = 1,2,3,... 5) used in the synthesis or preparation of the polytriazole resins are also listed in Table 8.1. The produced polytriazole resins made from the multifunctional azide (A or Ay and alkyne monomers (B., or B ) are separately designated as AjBj or A. B.or A.Bj or A. B.. The crosslinkable polytriazole resins could be cured at 70°C for 12 h. Thereafter, the solid resins were further postcured at 120°C for 2 h, 150°C for 2 h, and 180°C for 2 h to obtain well-cured resins. 

The polytriazole resins with various structures were prepared after fine design of molecular structures of monomers and polymers. 

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