Study of PS-PMMA diblock copolymer in solution using UV, DSC, and light-scattering techniques

Two well-characterized samples of polystyrene-poly(methyl methacrylate) diblock copolymers have been studied in solution. The ultraviolet spectroscopy, differential scanning calorimetry, and light-scattering techniques have shown that in a temperature region between 30 degrees C and 40 degrees C, the copolymer exhibits a conformational transition. The obtained results have also shown that below the transition temperature region, a more or less segregated conformation is adopted, and a pseudo-Gaussian conformation is adopted above this temperature region.