| abstract |
Polyester and polyamide membranes having improved permeation properties are disclosed. The membranes are derived from t-butyl-substituted isophthaloyl halide, in particular, 5-t-butylisophthaloyl chloride. The t-butyl-substituted isophthaloyl chloride can be employed with monomers such as diols and diamines to provide polyesters and polyamides with improved permeation properties. |