Thermomechanical analysis of polysaccharide hydrogels in water

Citation
M. Iijima et al., Thermomechanical analysis of polysaccharide hydrogels in water, J THERM ANA, 64(2), 2001, pp. 617-627
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
ISSN journal
1388-6150 → ACNP
Volume
64
Issue
2
Year of publication
2001
Pages
617 - 627
Database
ISI
SICI code
1388-6150(2001)64:2<617:TAOPHI>2.0.ZU;2-A
Abstract
Application of thermomechanometry to the measurement of hydrogels containin g a large amount of water was carried out by static and dynamic methods. A thermomechanical analyzer (TMA) equipped with a quartz compression probe im mersed in water was used. Polysaccharide hydrogels containing ca 98% water were measured. Creep of hydrogels in water was analyzed in a stress range f rom 1.04.10(3) to 5.2.10(3) Pa and loading rate from 0.3.10(3) to 3.0.10(3) Pa min(-1). Stress relaxation was measured in compressed ratio range from 0.02 to 0.45 m m(-1) and in compressing rate was 0.09 to 0.15 m m(-1) min(- 1). Dynamic viscoelasticity was measured by TMA when dynamic Young's modulu s which was larger than 1.10(4) Pa in frequencies ranging from 0.02 similar to0.2 Hz.