Conclusions
The kinetics of acylation of amino groups in acid reaction solutions of poly-m-phenylene-isophthalamide oligomers (or polymer) has been examined. The course of the process is described by zero order with respect to amino group concentration. The rate of acylation is determined by the acylating properties of the dimethylacetamide-hydrogen chloride system.
Similar kinetic relationships were found for m-phenylenediamine. The reactivity of the terminal amino groups hardly changes on transition from m-phenylenediamine to PMPI oligomer (polymer), apparently due to the fact that the course of the process is limited by the properties of the acylating system.
It has been shown that reduction in acidity or in medium temperature reduces the contribution of this reaction to termination of the PMPI polymer chain and correspondingly raises the quality of the reaction solutions.
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Literature cited
M. P. Vladimirova, A. G. Zhuglin, and B. I. Zhizdyuk, Khim. Volokna, No. 5, 26–27 (1987).
E. A. Emelin et al., Vysokomol. Soedin., Ser. A, 23, 231 (1981).
Additional information
Translated from Khimicheskie Volokna, No. 6, pp. 15–17, November–December, 1989.
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Vladimirova, M.P., Zhigulin, A.G. & Zhizdyuk, B.I. Kinetic relationships in acylation of thermal amino groups in reaction solutions of poly-m-phenyleneisophthalamide. Fibre Chem 21, 459–461 (1990). https://doi.org/10.1007/BF00544426
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DOI: https://doi.org/10.1007/BF00544426