Solvent-Free Polymerization of l-Aspartic Acid in the Presence of d-Sorbitol to Obtain Water Soluble or Network Copolymers |
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Authors: | Randal L Shogren Kenneth M Doll J L Willett Graham Swift |
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Institution: | (1) Plant Polymer Research Unit, National Center for Agricultural Utilization Research, USDA/ARS, 1815 N. University St., Peoria, IL 61604, USA;(2) Food and Industrial Oil Research Unit, National Center for Agricultural Utilization Research, USDA/ARS, 1815 N. University St., Peoria, IL 61604, USA;(3) Folia, Inc., Birmingham, AL, USA |
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Abstract: | l-Aspartic acid was thermally polymerized in the presence of d-sorbitol with the goal of synthesizing new, higher molecular weight water soluble and absorbent copolymers. No reaction occurred
when aspartic acid alone was heated at 170 or 200 °C. In contrast, heating sorbitol and aspartic acid neat or with ammonium
hydroxide gave a mixture of water soluble and insoluble copolymers of polysuccinimide and sorbitol. In the presence of phosphoric
acid, sorbitol aspartate ester copolymers having both water soluble and highly swollen gel components were formed. These results
indicate that polysaccharides such as sorbitol can readily react to form copolymer ester/amides with aspartic acid and such
copolymers may have utility as biodegradable water soluble and swellable polyampholytes. |
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