Polymeric alloys

Details Polymeric alloys Polymeric alloys

1989-04-14

1991-09-17

Bleutge, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525146, 525425, 523340, C08L 6900, C08L 3312

Patent

active

050496190

ABSTRACT:
Two-component polymeric compositions having two interconnected solid phases, and exhibiting spinodal decomposition morphology at the domain boundaries are shown, as are methods for forming the same. The compositions are prepared from two different polymers one of which possesses ductility in that it shows substantial yield behavior under tensile stressing, the other being brittle, exhibiting no such behavior; thermoplastic polymers, in conjunction with thermotropic liquid crystalline materials, exemplify such systems. The desired morphology is created by preparing the two component compositions in a single solid phase below the lower critical solution temperature of the compositions, and thereafter heating the compositions above such temperature to form a two-phase system. After a predetermined period of time at the upper temperature, during which spinodal decomposition spontaneously occurs, stabilization of the spinodal morphology is achieved by lowering the temperature of the compositions below the lower of its two glass transition temperatures.

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patent: 4753654 (1988-05-01), Kyu et al.
patent: 4987188 (1991-01-01), Furno
Kyu, "Kinetics of Phase Separation by Spinodal Decomposition in PC/PMMA Blends" Polymer Preprints, Aug. 1987, vol. 28, No. 2.
Nakai, "Spinodal Decomposition of Polymer Mixtures with a Thermotropic LCP As One Component" Macromolecules 1986, 19, p. 3008.
"Phase Separation by Spinodal Decomposition in Polycarbonate/Poly (Methyl Methacrylate) Blends", Macromolecules, 1988, 21, pp. 1021/1026, Author: Thein Kyu and Jeanne M. Saldanha.

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