Microporous thermally sensitive hydrogels based on hydroxypropyl cellulose crosslinked with poly-ethyleneglicol diglycidyl ether |
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Authors: | E Marsano E BianchiL Sciutto |
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Affiliation: | Dipartimento di Chimica e Chimica Industriale, Università di Genova, Via Dodecaneso 31, Genova 16146, Italy |
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Abstract: | New microporous thermally sensitive hydrogels were prepared by crosslinking hydroxypropylcellulose (HPC) with poly-ethyleglicol diglycidyl ether. The crosslinking reaction was carried out in heterogeneous liquid crystalline phase. Phase separation was obtained at room temperature by using the mixed solvent water/dimethylsulfoxide (DMSO). A study of phase equilibrium for the ternary system HPC/water/DMSO is reported. Hydrogels obtained from heterogeneous conditions show a porous structure with interconnected channels characterized by high solvent adsorption rate, while gels obtained from homogeneous solutions show a compact structure. The hydrogels have thermally sensitive behaviour, swelling at low temperature and contracting at high temperature. A thermal cycle corresponding to a reversible process of solvent absorption and deabsorpion is illustrated. |
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Keywords: | Hydrogel Hydroxypropylcellulose Thermally sensitive gels |
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