Abstract
The leaching/retention of a variety of aqueous soluble polymers from blends with ethylcellulose has been studied using combined torsional braid analysis and gravimetric analysis. Interactions between the two blend components in conjunction with related morphological features produced retention all through the composition range for blends of ethylcellulose with hydroxypropyl methylcellulose phthalate, cellulose acetate phthalate and hydroxypropyl cellulose. In the case of ethylcellulose/hydroxypropylmethylcellulose blends retention only occurs at high ethylcellulose concentrations because of the protective action of the ethylcellulose matrix on the dispersion of the water-soluble component. Complete leaching of polyethylene glycol 6000 occurs except in compositions with small amounts of ethylcellulose where there is an increased molecular attraction.
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