Polymer(Korea), Vol.7, No.4, 228-235, August, 1983
Polar Additive 농도에 따른 Organo Hectorite Rheology
Effect of Polar Additive Concentration on the Rheology of Organo-Hectorite Gel
초록
Stearyl dimethyl benzyl ammonium hectorite(SDBAH)-organic solvent gal은 일반적으로 thixotropic하다고 알려져 왔으나 gel의 유동성질은 첨가되는 polar additive 농도에 좌우됨을 알 수 있었다. Polar additive 함량이 SDBAH 양의 약 40% 이상되면 대부분의 경우에 rheopectic 하였다. 또 순수한 polar additive를 사용하는 것보다 소량의 물을 포함한 수용액을 사용했을 때 높은 점도를 나타내었다. 본 실험에서는 methanol, methylcellosolve 및 dimethyl sulfoxide와 이들의 수용액을 polar additive로 첨가하여 얻은 SDBAH의 n-butyl acetate gel에서 나타나는 rheology를 관찰하였다.
Rheology of stearyl dimethyl benzyl ammonium hectorite (SDBAH)-n-butyl acetate gel prepared with methanol, methylcellosolve, dimethyl sulfoxide and their aqueous solution as polar additives was observed. The flow behavior of SDBAH-organic solvent gel is generally known to be thixotropic but it was observed in the present experiments that its flow properties were mainly influenced by the concentration of polar additives added into the system. In most cases the gel with more than 40% of polar additive content based on SDBAH weight showed rheopexy. The addition of small portion of water as polar additive caused a gel to exhibit higher viscosity than that of
anhydrous polar additive.