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Synthesis of poly(succinimide) by bulk polycondensation of L-aspartic acid with an acid catalyst

✍ Scribed by Takeshi Nakato; Atsushi Kusuno; Toyoji Kakuchi

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
117 KB
Volume
38
Category
Article
ISSN
0887-624X

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✦ Synopsis

The bulk polycondensation of L-aspartic acid (ASP) with an acid catalyst under batch and continuous conditions was established as a preparative method for producing poly(succinimide) (PSI). Although sulfuric acid, p-toluenesulfonic acid, and methanesulfonic acid were effective at producing PSI in a high conversion of ASP, o-phosphoric acid was the most suitable catalyst for yielding PSI with a high weightaverage molecular weight (M w ) in a quantitative conversion; that is, the M w value was 24,000. For the continuous process using a twin-screw extruder at 3.0 kg ⅐ h Οͺ1 of the ASP feed rate, the conversion was greater than 99%, and the M w value was 23,000 for the polycondensation with 10 wt % o-phosphoric acid at 260Β°C. Sodium polyaspartate (PASP-Na) originating from the acid-catalyzed polycondensation exhibited high biodegradability and calcium-ion-chelating ability. The total organic carbon value was 86 Ο³ 88%, and 100 g of PASP-Na chelated with 5.5 Ο³ 5.6 g of calcium ion, which was similar to the value for PASP-Na from the acid-catalyzed polycondensation with a mixed solvent

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