Optimization of the Thermomechanical Behavior of a Poly(Chromium III Trisphosphinate).
Technical rept. Sep 69-Oct 71,
PRINCETON UNIV N J DEPT OF CHEMICAL ENGINEERING
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A two-component reactive system consisting of a polychromium 3 bisphosphinate and dioctyl phosphinic acid reacts to form a polychromium 3 trisphosphinate. Extensive thermomechanical hysteresis is displayed by the system throughout the temperature range -180C to 300C. Thermal pretreatment to about 400C the limit of thermal stability eliminated these instabilities. These results correlate with the reported brittle and tough character of films of the polychromium 3 bisphosphinate and polychromium 3 trisphosphinate respectively. Regardless of thermal history between 200C and 400C, the polymer system displayed three major transition regions one the glass transition centered at about 0C, another centered at about 230C, and a third at about -200C. Author