Preparation and Properties of Sulfonated β-Cyclodextrins Used as Water-reducer

摘要

Sulfonated β-cyclodextrin was synthesized with β-cyclodextrins (β-CD) and concentrated sulfuric acid.The molecular structure of sulfonated β-cyclodextrin was characterized by FTIR and 1H-NMR.The dispersing ability of sulfonated β-cyclodextrin was investigated using various characterization methods like paste fluidity,adsorption amount and zeta potentials measurements.The results show that compared with sulphonated naphthalene based superplasticizer (NPS),the fluidity of cement paste dosage with sulfonated β-cyclodextrin is 248 mm,the zeta potential value changes from 11.5 mV to-19.6 mV with the concentration of sulfonated β-cyclodextrin increasing from 0 to 15 g/L and the maximum adsorption amount is 20 mg/g.Meanwhile,FTIR and 1H-NMR results indicate that the sulfonic groups were grafted successfully on the molecular chain of the β-CD.