Stability and shear thixotropy of multilayered film foam

Understanding of foam rheology is significant for the study of foam stabilization. In fact, the foam thixotropy is an important factor to foam stability, but the study about it has not attached great importance. Shear viscosity of different foam stabilizer solutions were investigated as well as microstructure, shear viscosity thixotropy, and stability of different foam systems prepared by the different foam stabilizers. The results show that high shear viscosity of foaming agent solution contributes to decreasing drainage of foam. Collapse of foam depends on the compact degree of molecular alignment. Reaction between the hydrophilic groups of foam stabilizer molecule and accessory ingredient molecule determines shear viscosity of foaming agent solution. Thixotropy of the foam can be used to evaluate the recoverability after sheared by high speed. Strong interaction forces and compact arrangement between the foam stabilizer molecule and accessory ingredient molecule contributes to improving stability and recoverability of foam. Foam stability increases with shear thixotropic recoverability of foam.