Abstract
By means of static and dynamic light scatterin, we investigate competitive behavior of association and liquid-liquid phase separation in solutions of two diblock copolymers in weakly-selective poor solvent. Near the critical point of liquid-liquid phase separation, the copolymer consisting of chemically similar blocks poly(dimethylsiloxane) (PDMS) and poly(1,1,3,3-tetramethyldisiloxanylethylene) (PTMDSE) shows very weak association, exhibiting the ordinary critical behavior of 3-dimensional (3D) Ising model, but the copolymer consisting of chemically dissimilar blocks of PDMS and polystyrene (PS) shows two modes in static and dynamic light scattering, showing increasing association as well as the critical concentration fluctuation with the liquid-liquid phase separation being approached. The static critical behavior obeys the 3D Ising model as in PDMS-block-PTMDSE, while the copolymer associations bring about unique dynamic properties in poor solvent different from those of homopolymer solutions.
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Azuma, T., Tyagi, O. & Nose, T. Static and Dynamic Properties of Block-Copolymer Solution in Poor Solvent I. A Light Scattering Study on Solutions in Weakly-Selective Solvents. Polym J 32, 151–158 (2000). https://doi.org/10.1295/polymj.32.151
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DOI: https://doi.org/10.1295/polymj.32.151
