using huggins equation with two test temperatures viscosity

Currently, polymerization conditions attract considerable attention, such as temperature, monomer content, and length of the hydrophobic chain, which exert a significant effect. To overcome these limitations, researchers have proposed several techniques, including a low temperature for initiation. Moreover, the purification process is relatively complex. Simultaneously, a chain transfer phenomenon occurs, resulting in a low molecular weight. However, micelle aggregation in aqueous solution has several limitations, such as the separation of molecule monomers, low molecular weight and temperature control. 5–7 Therefore, research in this area has attracted considerable attention. Research on soluble hydrophobic monomers addresses their solubility and mixing problems, so that hydrophobic chains can be easily incorporated into polymers. Several synthesis methods of HAPAM have already been proposed. The results show that there are two types of association between the hydrophobic chains, which are the main reasons behind the particular rheological properties. 1–3 Recent research has been conducted on the mechanism of hydrophobic associated polymers. When the concentration of a polymer is above the critical association concentration (CAC), the hydrophobic group interacts, thus making the molecule undergo an intramolecular to intermolecular association, which changes the rheological properties. Introduction Hydrophobic associated polyacrylamide (HAPAM) incorporates a hydrophobic monomer with different side-chain lengths into polymer chains to demonstrate particular rheological properties. Therefore, the polymer was found to have excellent salt resistance and extensive application prospects. Meanwhile, the number of hydrophobic micro-zones increased, thus forming dense network structures. The storage modulus that indicated strong elasticity increased with an increase in the polymer concentration. Moreover, the apparent viscosity of the polymer remained above 80 mPa s when 0.3 wt% UUCPAM was added at 170 s −1 in 20 000 mg L −1 NaCl solution at 90 ☌. Rheology studies indicated that the polymer had good temperature and shear resistance in NaCl solution. The fluorescence probe experiment verified that the critical association concentration of this polymer decreased with an increase in the hydrophobic monomer. The scanning electron microscopy and transmission electron microscopy studies showed that the polymer had complex network structures and that this phenomenon was considerably obvious in NaCl solution. Polymerization exothermic test results indicated that the increase in the hydrophobic monomer content led to an increase in the exothermic time, which is considerably conducive to the formation of hydrophobic structures. Herein, a novel ultra-high salt hydrophobic associated polymer, UUCPAM, was prepared using acrylamide, acrylic acid, 2-acrylamide-2-methyl propane sulfonic acid and the hydrophobic monomer UUC.

Using huggins equation with two test temperatures viscosity