STUDY OF PLASTICIZER-OLIGOMER AND PLASTICIZER-POLYMER INTERACTIONS BYDIELECTRIC ANALYSIS - MALTOSE-GLYCEROL AND AMYLOSE-GLYCEROL-WATER SYSTEMS

Dielectric analysis was performed on amorphous maltose-glycerol and am ylose-glycerol-water systems. A primary relaxation, appearing in the r ange of the calorimetric glass transition temperature, was observed in the maltose-glycerol system. From 0% (w/w) to approximately 30% (w/w) glycerol, a secondary relaxation was observed at lower temperature in both systems. In this concentration range, the addition of glycerol s hifted the primary relaxation to lower temperature and the secondary r elaxation to higher temperature. For mixtures containing around 30% (w /w) glycerol, the relaxation map revealed a merging of the primary and secondary relaxations or a disappearance of the secondary relaxation. Above 30% (w/w) glycerol in the amylose-glycerol-water system, indica tion of a phase separation was obtained. This behaviour is compared wi th the relaxation behaviour of some plasticized synthetic polymers (po lyvinylchloride and polyisoprene). (C) 1998 Elsevier Science Ltd. All rights reserved.