The objective of the study was to formulate controlled release matrix tablets of losartan Potassium by using a combination of hydrophilic synthetic polymer like poly (ethylene oxides) and natural gums like xanthan gum, karaya gum and guar gum. A combination of synthetic hydrophobic polymers like methacrylates with synthetic hydrophilic polymer like poly (ethylene oxide) was also used in the pre...

Hydrophobically modified (HM) water-soluble polymers, e.g. cellulose, starch or guar exhibit enhanced solution viscosity and unique rheological behaviour. These properties are explained in terms of intermolecular hydrophobic associations [1]. The general solution viscosity behavior of HM polymers of different hydrophobic chain length (moth frequently in the range of C8 to C24) is characterized ...

© Appl. Rheol. 15 (2005) 370–389 Abstract: We present a one-parameter model that fits quantitatively the mean velocity profiles from experiments and numerical simulations of drag-reduced wall-bounded flows of dilute solutions of polymers and non-Brownian fibers in the low and modest drag reduction regime. The model is based on a viscous mechanism of drag reduction, in which either extended poly...

Poly([stearyl methacrylate]-stat-[2-(dimethylamino) ethyl methacrylate]) was synthesised through radical polymerisation using 1,1-diphenyl ethylene (DPE) as a molecular weight controlling agent. The amino groups were further quaternised into a cationic form in order to increase water solubility. Solubility of the polymers in water and a mixed solvent was studied with rotational rheometry. The r...

We study dilute solutions of poly(ethy1ene oxide) (PEO) and sodium dodecyl sulfate (SDS) mixture in water with small angle neutron scattering (SANS) experiments. The attachment of the surfactant molecules to the polymers in the form of micelles results in a repulsive interaction within the polymers, which in turn results in interesting behavior of the viscosity as a function of the SDS concentr...

Above a critical chemistry-dependent molecular weight, all polymer molecules entangle and, as a result, exhibit slow dynamics, enhanced viscosity, and elasticity. Herein we report on the dynamics of low molecular weight polymers tethered to nanoparticles and find that even conventionally unentangled chains manifest dynamical features similar to entangled, long-chain molecules. Our findings are ...

Triton(®) X-100 (poly(ethylene glycol) tert-octylphenyl ether) was (meth)acrylated and polymerized in the absence and presence of randomly methylated β-cyclodextrin (RAMEB-CD). Triton(®)-polymers that were polymerized with RAMEB-CD in water were compared with polymers that were synthesized in organic solvents after the addition of RAMEB-CD. The polymers were characterized by (1)H NMR and FTIR s...