Syntheses and Properties of Polygunamine from Diester and Dibiguanide

Abstract

Polyguanamine was prepared in dipo!ar aprotic solvent such as dimethylsulfoxide (DMSO) or dimethylformamide (DMF) from aliphatic or aromatic dicarbo, xylic acid diphenylester and dibiguanide. Polymer from aliphatic diester had reduced viscosity 0.40-0.80 dl/g in DMSO and formed a hard flexible film from DMF or formic acid solution. A solution of this polymer in formic acid showed high viscosity and the electrolytic fashion. The above polymer was soluble in sulfuric acid, m-cresol and dipolar aprotic solvent and softened at 230-280°C, whereas aromatic polyguanamine was slightly soluble and softened above 330°C. A good thermal stability of polyguanamine was observed by TG measurement.
Glass transition point of polyguadamine determined by dynamic viscoelastic measurement was 100-110°C and its specific gravity was 1.25-1.30. The influence of guanamine structure on the various properties of the polymer was discussed.