The determination of the lower critical concentration temperature and intrinsic viscosity: The syneresis reaction of polymeric gels

This work studies (by rheological method) the temperature dependence of coil-to-coil contact critical concentration (C* in g/L) and intrinsic viscosity ([η] L/g) as capacity a single-coil to bind solvent molecules increase solution accordingly. The C* [η] were measured fitted by model characterize thermodynamic stability kappa-carrageenan (kC) polysaccharide solution. weakest greatest kC was found be ≈ 0.44 g/L ≈1.23 L/g, respectively. where at 30 °C is referred lower (LCCT). expansion greater LCCT, but its 20 according model. hydrodynamic permeability resistance defined C*[η] shown decrease smoothly slope 2.6 × 10−3/°C with from 0 45 °C, then strongly 22.5 after 60 °C. Therefore, if polymer LCCT gelled or higher temperature, sizes will (syneresis reaction), gel elasticity interfere kinetics reaction determine thereafter serum holding gels.