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Hierarchical porous structures in cellulose materials are important for the dissolution, properties and applications of cellulose materials. Methods for characterizing the hierarchical porous structures in cellulose materials without changing its original state are still limited. In this work, we introduced nuclear magnetic resonance (NMR) relaxometry for characterizing the hierarchical porous structures...
Ketalization reaction of poly(vinyl alcohol) (PVA) by acetone under acidic-catalyst/phase-transfer-catalyst was carried out easily and the structure of the product both swelled and dissolved in dimethyl sulfoxide-d 6 (DMSO-d 6 ) was confirmed, which then indicated the structural change in the product polyvinylketal (PVKT) due to its hydrolysis in water, by NMR measurements. The effect...
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