Effect of silicate module of water glass on rheological parameters of poly(sodium acrylate)/sodium silicate hydrogels

2nd International Conference on Rheology and Modeling of Materials

Mastalska-Popiawska, J.^1 ; Izak, P.^1

AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, Krakow, Poland^1

关键词: Crosslinking monomers;    Crosslinking reaction;    Methylene bisacrylamide;    Oscillation measurements;    Poly(sodium acrylate);    Potassium persulphate;    Rheological parameter;    Viscoelastic properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/790/1/012021/pdf
DOI  :  10.1088/1742-6596/790/1/012021

来源: IOP

【 摘 要 】

The poly(sodium acrylate)/sodium silicate hydrogels were synthesized in the presence of sodium thiosulphate and potassium persulphate as the redox initiators and N,N'-methylene-bisacrylamide as the cross-linking monomer. 20 wt% aqueous solution of sodium acrylate was polymerized together with water glass with different silicate modules (M) from 1.74 to 2.29, in three mass ratio of the monomer solution to the water glass 2:1, 1:1 and 1:2. Such obtained hybrid composites were rheologically tested using the oscillation method. It allowed to designate the crossover point during polymerization, as well as to define the viscoelastic properties of the casted hydrogel samples one week after the reaction. The obtained results of the oscillation measurements showed that cross-linking reaction proceeds very quickly and the lower the silicate module is, the process starts faster. After the completion of the reaction the silicate-polymer hydrogels are strongly elastic materials and the highest elasticity characterizes systems with the mass ratio 1:2, i.e. with the highest water glass content.