Carboxymethylchitosan-based hydrogels crosslinked with polydimethylsiloxane
AbstractSynthesis and properties of hydrophilic carboxymethylchitosan (CMC) hydrogels containing hydrophobic polydimethylsiloxane (PDMS) were herein presented. Fourier transform infrared spectroscopy indicated that PDMS can covalently bound to CMC chains with the use of hexamethylene-1,6-di-(aminocarboxysulfonate) (HDA), a water soluble crosslinker. Also, according to scanning electron microscopy, PDMS microphases with the size of 0.2-0.5 Âµm in diameter were thoroughly dispersed in CMC matrix. Addition of PDMS improved properties of the CMC hydrogels including increasing water vapor permeability and water swellability, improving tensile properties and increasing surface hydrophobicity. PDMS with different amounts (1-20 wt%) and molecular weights (2,000 and 8,000 gÂ·mol-1) were added into CMC hydrogels in order to investigate the effect of its concentrations and chain lengths on these properties. It was found that increasing the concentrations and molecular weights of PDMS seemed to further improve these properties, indicating the feasibility in tuning these properties of CMC hydrogels for specific applications.
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