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КНИЖНЫЙ МИР

self assemble behavior of triblock copolymers in solution   Imad Ud Din,Mohsan Nawaz and Israr Ahmad

self assemble behavior of triblock copolymers in solution

76 страниц. 2011 год.
LAP Lambert Academic Publishing
The aqueous solutions of two triblock copolymers of poly(oxybutylene/oxyethylene /oxybutylene) were studied by surface tensiometry, viscometry and dynamic laser light scattering techniques at various temperatures (293, 303, 313 and 323K).Effect of block architecture and temperature on surface and miceller properties was also studied. Critical micelle concentration (CMC) and thermodynamics of micellization were determined by surface tensiometry. Surface activity of these triblock copolymers was studied by measuring surface parameter i.e surface pressure (?), surface excess concentration ( Г ), area per molecule (oA), of polymer and standard Gibb’s free energy of adsorption (?Gads) at different temperature. Miceller parameter like CMC, surface tension at CMC (?CMC) were determined. Thermodynamic parameters, standard free energy of micellization (?Gmic), standard entropy of micellization (?Smic) and enthalpy (?Hmic) was calculated from CMC value at different...
 
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