Forms of composition-property relationships for mixtures of thermodynamically incompatible polymers

• Published in: Polymer science USSR 1979, Vol.21 (4), p.949-959
• Main Authors: Kudryavtsev, G.I., Fedorova, R.G., Nikitina, O.A., Shablygin, M.V.
• Format: Article
• Language: English
• ISSN: 0032-3950; 1878-268X
• DOI: 10.1016/0032-3950(79)90199-0

A study has been made of the influence of thermodynamically incompatible mixtures of aromatic and alipathic-aromatic polyamides on forms of composition-property relationships in solution and in the solid state (isotropic and anisotropic systems). On investigating the viscosity properties of mixed polymer solutions aggregation of components of a fluctuating character was found for kinetically stable mixtures and the absence of interaction in the case of systems subject to phase separation. Properties exhibited in the case of anisotropic systems are placed under two headings: 1) the extremal type rise in the thermal stability of mixtures compared with the homopolymers; 2) the nonadditive character of the dependence of the strength properties of oriented mixed systems. The thermal stability splashes observed for some mixed polymers may be the result of structuration occurring in the systems on account of bridge-like covalent bonds and H bonds. Extremal deviations from additivity observed for the strength properties of the fibres are attributable both to orientation phenomena and to system reinforcement by the oriented and stronger ultrathin anisodimetric dispersed phase particles.