Nylon Microcapsules: I. Effect of Organic Phase and Stirring Speed

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Abstract
The effect of organic phase and stirring speed on the preparation of nylon microcapsules using 1,6-hexamethylene diamine and sebacyl chloride in the interfacial polycondensation reaction has been investigated. Carbon tetrachloride alone and the traditional 20% chloroform in cyclohexane were found to be poor solvents producing non-separable clumps of microcapsules. Mineral oil, singly, and in combination with varying amounts of carbon tetrachloride, cyclohexane, or chloroform yielded discrete free-flowing microcapsules. In general, lower speeds of stirring produced products which were more discrete and free flowing than those prepared at higher stirring rates.