Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9694091 | Thermochimica Acta | 2005 | 5 Pages |
Abstract
Aqueous solutions of pectin annealed at various temperatures at sol state were mixed with CaCl2 solution and calcium pectin gels with various cross-linking ratios were prepared. A thermomechanical analyser (TMA) equipped with a sample holder, which was newly designed at our laboratory was used. The sample holder was immersed in water whose temperature was controlled from 30 to 80 °C. Swelling behaviour of hydrogels during equilibration was measured as a function of immersing time. Creep coefficient was calculated as functions of time and temperature using a compression type probe. The creep coefficient of hydrogels increased with increasing swelling temperature and decreased with increasing cross-linking ratio. Dynamic modulus (Eâ²) was measured in water in a temperature range from 30 to 60 °C. Eâ² of the gel with cross-linking ratio 0.36 decreased from 5.5 Ã 104 to 3.5 Ã 104 Pa with increasing swelling temperature from 30 to 60 °C.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Mika Iijima, Tatsuko Hatakeyama, Hyoe Hatakeyama,