Light scattering and viscoelasticity study of poly(vinyl alcohol)-borax aqueous solutions and gels |
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Authors: | Hsiu-Li Lin T. Leon Yu Wen-Horng Liu |
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Affiliation: | a Department of Chemical Engineering and Materials Science, Yaun Ze University, Nei-Li, Taoyuan 32026, Taiwan, ROC b Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 10021, Taiwan, ROC |
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Abstract: | Poly(vinyl alcohol)-borate (PVA-borate) aqueous solutions properties with PVA concentrations ranging from 2 to 60 g/L and borax concentrations of 0.0 and 0.2 M were investigated at room temperature using static and dynamic light scattering (SLS and DLS), and dynamic viscoelasticity measurements. Light scattering and viscoelasticity data revealed that all the PVA-borate aqueous systems, except those with [PVA]≥40 g/L and [borax]=0.2 M, behaved as solutions. For PVA-borate aqueous systems with [PVA]≥40 g/L and [borax]=0.2 M, light scattering data revealed that these systems behaved like gels, but viscoelasticity data showed that these systems were in flow states. The experimental data suggest that PVA-borate aqueous systems with [PVA]≥40 g/L and [borax]=0.2 M are thermoreversible gels with finite equilibrium life time of thermoreversible borate-PVA di-diol crosslinks. The thermoreversible crosslinks can be observed by the non-perturbing light scattering technique but not by the pertubing rheometric method. These results indicate the advantage of light scattering relative to rheometers for studying the physical or reversible crosslink gels. |
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Keywords: | Poly(vinyl alcohol) Light scattering Viscoelasticity |
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