A thermodynamic investigation of micelle formation by a polystyrene-b-polyisoprene block copolymer in n-hexadecane
作者： C. Price , E.K.M. Chan , R.H. Mobbs , R.B. Stubbersfield
DOI: 10.1016/0014-3057(85)90191-0
关键词: Thermodynamics of micellization 、 Standard molar entropy 、 Chemistry 、 Physical chemistry 、 Standard enthalpy of formation 、 Micelle 、 Hexadecane 、 Aggregation number 、 Polymer chemistry 、 Gibbs free energy 、 Critical micelle concentration
摘要: Abstract The thermodynamics of micelle formation by a polystyrene-b-polyisoprene block copolymer in n-hexadecane, which is selectively bad solvent for polystyrene, has been investigated. temperature dependence the critical concentration (c.m.c.) was determined from measurements scattering intensity against carried out at seven concentrations within range (1.24–3.25) × 10−4 mol dm−3. A plot 1n T−1 gave value standard enthalpy micellisation −40.7 ± 2.2 kJ mol−1 chains. entropy contribution ( −TΔS ⊖ ) to free energy found be positive. results are strong contrast those reported synthetic surfactants aqueous media below 50°C favourable change factor mainly responsible formation.
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