The Negative Thixotropic Behaviour of MontmorHlonite and Hydrolyzed Polyacrylamide System
Chen Zong-Qi;Xin Yin-Chang;Li Xiao-Zheng;Lu Cheng-Xue Department of Chemical Engineering, Qingdao Institute of Chemical Technology, Qingdao
In the course of a study on the change in the fiuidity and thixotropy of montmori- llonite suspension by added hydrolyzed polyacryamide, it was noticed that some of them displayed unusual thixotropic behaviour in that they showed in their natural state a negative thixotropy; in other words,the fluidity of the suspension increased with time. This negative thixotropic behaviour of this system was time-dependent, as can be seen from Figure 1 (Chinese Text) and they show clockwise hysteresis loops. The consistency of the suspension has a considerable influence on this unusual behaviour and additions of salts destroy the ability of the materials to build up a structure possessing a"negative thixotropic" behaviour.