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Two kinds of polymers, Methylcellulose (MC) and polyethylene oxidepolypropylene oxide-polyethylene oxide (PEO-PPO-PEO), in aqueous solutions have been studied. Firstly, aqueous solutions of MC with different molecular weights (Mw = 100,000 and 310,000, and 400,000) have been studied. The thermoreversible gelation properties and the gel elasticity were measured as a function of polymer concentration by means of micro differential scanning calorimetry (micro DSC) and rheology, respectively. The experimental results prove that the thermoreversibility of the aqueous solutions of MC is independent of either polymer concentration or Mw. The total enthalpy required for the sol-gel transition is a linear function of polymer concentration, which is again independent of Mw. The scaling laws for the quasi equilibrium modulus Ge with concentration c were presented. At the same concentration of MC, Ge increases with increasing Mw, while the heat absorbed during the sol-gel transition remains constant. Then the binding interactions between MC and sodium dodecyl sulphate (SDS) were studies by isothermal titration calorimetry, the temperature effect was investigated. At low temperature (25 °C), the titration curve can be divided into four zones: zone 1 starts at initial injection, where only dilution of SDS micelles and non-cooperative binding of small amount of SDS to the MC backbone and/or hydrophobic groups occur. Zone 2 is an endothermic peak, where the cooperative binding of SDS to MC molecules occurs and results in formation of complex micelles. Zone 3 starts at the end of the endothermic peak and the onset of the ii ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library

Thermoreversible gelation of methylcellulose and pluronics in water