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

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.