Synthesis of Poly-(p-Phenylenebenzobisthiazole) Used for Manufacture of Thermostable High-Modulus Fibres

Research paper by V. N. Odnoralova, V. N. Kiya-Oglu, N. I. Goryacheva, A. V. Ivanova, V. I. Ognev, V. A. Platonov, G. A. Budnitskii

Indexed on: 01 Sep '02Published on: 01 Sep '02Published in: Fibre Chemistry


The possibility of reducing the duration of synthesis of poly(p-phenylenebenzobisthiazole) (PPBT) from 2,5-diamino-1,4-dimercaprobenzene and terephthalic acid in polyphosphoric acid medium with production of a high-molecular-weight with [η] = 24-29 dl/g is demonstrated. It is shown that with a lower duration of synthesis of PPBT, polycondensation solutions have a lower viscosity (1500-2000 Pa·sec) at 150-165°C, which facilitates spinning of high-strength and high-modulus fibres.