Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
Temperature Effect on the Molecular Weight and the Optical Purity of Anhydropolyaspartic Acid Prepared by Thermal Polycondensation
Etsuo KokufutaShinnichiro SuzukiKaoru Harada
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Volume 51 (1978) Issue 5 Pages 1555-1556

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Abstract

Anhydroyplyaspartic acid (APAA) was prepared by the thermal polycondensation of L-aspartic acid in the solid state at 160-220 °C for 5 h. The effect of temperature on molecular weight and optical purity of APAA was investigated. The molecular weight increases rapidly in the temperature range 180–200 °C, the yield of APAA also increasing rapidly. The optical purity deecreases rapidly with rise in temperature from 160–180 °C.

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