Low temperature bath

Polyethylene 7 x 10-4 Polypropylene 4 x 10-4 1 0.57 0.49 should be equal to the value of K (Table 11); in this case there is only a fair agreement.If transition temperatures are plotted against molar copolymer compositions, one can obtain a linear relationship, in agreement with the results of Natta and Crespi" obtained by minimum rebound temperatures measurements.Because of the good reproducibility (Table I) of the dilatometric second-order transition temperature determinations, the propylene content of such a copolymer could be evaluated in this way.