Factors which influence the reaction between raw cotton and β-propiolactone were studied. It was found that the noncellulosic alkaline salts, naturally present in raw cotton, catalyze the reaction and make possible weight gains of over 200%.
Mercerization, increase in twist, and the presence of natural waxes and of excess moisture adversely affect the reaction. The extent of reaction depends upon time, temperature, and the concentration of reagents, as with purified cotton.
Prepolymerized β-propiolactone will not react to any appreciable extent with raw cotton.
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