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Thermoplastic starch modification during melt processing: Hydrolysis catalyzed by carboxylic acids |
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| Authors: | Antonio J.F. Carvalho Marcia D. Zambon A. Aprigio da Silva Curvelo Alessandro Gandini |
| Affiliation: | aInstituto de Física de São Carlos, Universidade de São Paulo, PB 369, 13560-970 São Carlos, SP, Brazil bInstituto de Química de São Carlos, Universidade de São Paulo, PB 780, 13560-750 São Carlos, SP, Brazil |
| Abstract: | The melt processing of glycerol-plasticized starch in the presence of non-volatile carboxylic acids resulted in a progressive loss of its molar mass, because the residual moisture in the mixture induced an acid-catalyzed hydrolysis of the ether linkages in its polysaccharide chains. The study of this reaction provided a useful means of adjusting its course and thus of preparing starch materials with controlled properties. |
| Keywords: | Thermoplastic starch Biodegradable polymers Melt processing |
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