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9-Amino-nonaneic acid was polycondensed in boiling paraffin hydrocarbon medium, the water formed during the reaction was immediately carried away by the vapor of the medium. By using this technique, polycondensation ran very rapidly, and within 15 min. the extent of reaction (p) reached more than 95%, and after 3 hrs., p surpassed 99%. The number average molecular weight was higher than 40,000. These have never been reached as reported in literature.Because p can be pushed to over 99%, it is possible to study the complete course of polycondensation reactions. It was found that the reaction followed second order from the beginning up to p around 99%. Beyond this, the system became so viscous that a viscosity factor should be considered. This caused the reaction to be changed to third order.
9-Amino-nonaneic acid was polycondensed in boiling paraffin hydrocarbon medium, the water formed during the reaction was immediately carried away by the vapor of the medium. By using this technique, polycondensation ran very rapidly, and within 15 min. The extent of reaction (p) reached more than 95%, and after 3 hrs., p surpassed 99%. The number average molecular weight was higher than 40,000. These have been reached as as reported in literature.Because p can be pushed to over 99% it was possible to study the complete course of polycondensation reactions. It was found that the reaction followed second order from the beginning up to p around 99%. Be caused this, the system became so viscous that a viscosity factor should be considered. This caused the reaction to be changed to third order.