Polymer degradation. I. Column elution fractionation and thermal degradation of polyoxypropylene glycol–toluene diisocyanate (PPG-TDI) polymers

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Abstract

A procedure has been worked out for the column elution fractionation of polyoxypropylene glycol–toluene diisocyanate (PPG-TDI) polymers of molecular weight ∼100,000; by decreasing the column temperature from 34 to 7°C. the method was extended to degraded polymer of molecular weight ∼25,000. Graphical differentiation of the integral curves was eliminated by using Tung's empirical equations. The results for both degraded and undegraded polymer agreed with the theoretical most probable distributions; therefore, a random scission process of degradation is indicated.

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