Journal
APPLIED CLAY SCIENCE
Volume 165, Issue -, Pages 223-233Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2018.07.044
Keywords
Clay mineral/polymer nanocomposite hydrogel; Montmorillonite; Fully swollen state; Mechanical properties; UV-proof; Solvent-sensitivity
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Fully swollen montmorillonite/alginate/Ca2+ (Ca2+-MtAlg) nanocomposites with a specific chemical composition are expected to show well-ordered microstructure, excellent mechanical properties, unique optical properties and solvent sensitivities. Inspired by nacre, Ca2+-MtAlg nanocomposite hydrogel films with high montmorillonite mass contents (>= 20%) were synthesised by solution casting, followed by subsequent ionic crosslinking. The fully swollen Ca2+-MtAlg nanocomposite films were mechanically flexible and stable in water. By regulating the relative content of alginate and Mt, it was possible for the hydrogel films to reach a high tensile strength of 28 MPa. Ca2+-MtAlg hydrogel films also showed acceptable transparency and high efficiency in blocking ultraviolet light. Furthermore, they demonstrated solvent sensitivity; the hydrogels lost water in either methanol or acetone, the one with an Mt/Alg mass ratio of 1:4 coiled seriously in acetone while those with a lower mass ratio were more stable in either methanol or acetone. Overall, Ca2+-MtAlg nanocomposite hydrogel films have the potential for use in stimuli-responsive load-bearing biomedical applications, skin care and beyond.
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