Actually, I am planning to prepare Cellulose/ PVA transparent hydrogels. For preparation of Cellulose/ PVA transparent hydrogels I am using this solvent medium DMAc/LiCl. Is it possible to prepare Cellulose/ PVA transparent hydrogels by using the above (DMAc/LiCl) medium via freeze thaw technique by combination of PVA. Which % of PVA is suitable for the preparation of cellulose/ PVA transparent hydrogels?
I have not tried specifically with cellulose, but we have previously prepared composites of several natural polymers with PVA via freeze/Thawing and after 1 freeze/thaw cycle, they were mostly transparent (transparency was lost with repeated freeze/thaw cycles). You need to be careful with the freezing/thawing cycle with respect to the freezing point of your solvent. At a 1 natural polymer: 9 PVA w:w ratio transparency was maintained:
http://onlinelibrary.wiley.com/doi/10.1002/jbm.b.31310/abstract?userIsAuthenticated=false&deniedAccessCustomisedMessage=
Good luck :)
Yes, it is possible but it loses its transparency during repeated freeze/thawing cycles.
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