AbstractMeasurements have been conducted on radiation‐crosslinked polytetrahydrofuran (PTHF) of stress‐strain and of swelling coefficients in simple esters. For the linear polymer, measurements have been made of density and intrinsic viscosities in the esters. η was also determined under the θ conditions of 33.5°C. in diethyl malonate. The results have been incorporated into several (sometimes interdependent) approaches towards the evaluation of the solubility parameter δpof PTHF. The mean of the nine values obtained is 8.55 (cal./cc.)1/2, whence the cohesive energy density is 5.17 kcal./mole. Seventeen experimental values of the Flory interaction parameter χ are also
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