Abstract
Concentrated suspensions of sulfonated polyacrylamide (SPA)/Na+-montmorillonite
(Na-MMT) were prepared and their stability and steady shear rheological properties were described as a function of nanoparticle and polymer concentration and temperature. The results showed that the Na-MMT nanoparticles suspensions were
stable in the absence and presence of SPA and no sedimentation was seen. The Zaverage particle sizes for the SPA/Na-MMT suspensions increased in the presence of SPA. Rheological investigations showed that the SPA solutions and SPA/Na-MMT suspensions displayed non-Newtonian behavior in almost the whole range of shear rate. All the suspensions exhibited a shear-thinning flow character as shear rate increased. The flow curves indicated the shear viscosity and stress of the samples were
decreased with increasing nanoparticles concentration up to 1.5 wt%, but for NaMMT loading greater than 1.5 wt% there was an increase in shear viscosity and
stress of the suspensions. Increasing of SPA concentration had more effect on increasing the rheological properties of SPA/Na-MMT suspensions than increasing of nanoclay content. Shear viscosity and stress of the suspensions increased with increasing SPA concentration and decreased with increasing temperature from 50°C
to 70°C.
(Na-MMT) were prepared and their stability and steady shear rheological properties were described as a function of nanoparticle and polymer concentration and temperature. The results showed that the Na-MMT nanoparticles suspensions were
stable in the absence and presence of SPA and no sedimentation was seen. The Zaverage particle sizes for the SPA/Na-MMT suspensions increased in the presence of SPA. Rheological investigations showed that the SPA solutions and SPA/Na-MMT suspensions displayed non-Newtonian behavior in almost the whole range of shear rate. All the suspensions exhibited a shear-thinning flow character as shear rate increased. The flow curves indicated the shear viscosity and stress of the samples were
decreased with increasing nanoparticles concentration up to 1.5 wt%, but for NaMMT loading greater than 1.5 wt% there was an increase in shear viscosity and
stress of the suspensions. Increasing of SPA concentration had more effect on increasing the rheological properties of SPA/Na-MMT suspensions than increasing of nanoclay content. Shear viscosity and stress of the suspensions increased with increasing SPA concentration and decreased with increasing temperature from 50°C
to 70°C.
| Original language | English |
|---|---|
| Pages (from-to) | 761-770 |
| Number of pages | 10 |
| Journal | Journal of Macromolecular Science - Physics |
| Volume | 54 |
| Issue number | 7 |
| Early online date | 13 May 2015 |
| DOIs | |
| Publication status | Published - 29 May 2015 |
Keywords
- clay nanoparticles
- montmorillonite
- rheology
- sulfonated polyacrylamide
- suspension