Abstract
Four-arm star-shaped poly(2-isopropyl-2-oxazoline) (PiPrOx4) with calix[4]arene core was studied by methods of turbidimetry and light scattering in aqueous solutions at concentrations ranging from 0.0002 to 0.0364 g cm−3. The role of arm number in thermosensitive behavior was determined by comparing the experimental data with the results for eight-arm PiPrOx8 star. First of all, it is concerned with the growth of large aggregate fraction in PiPrOx4 solution and the formation of middle mode particles even at low temperature which causes the decrease phase separation temperatures. At relatively high concentrations (c >0.01 g cm−3), the dilution of PiPrOx4 solutions is accompanied by slow growth of phase transition temperatures, and the width ΔT = (1–2) °C of this interval does not depend on the concentration. In the dilute regime, ΔT rises and reaches 9 °C. It is shown that the changes of thermosensitive stars’ behavior with arm number reduction are caused by lower intramolecular density of PiPrOx4 in comparison with that of PiPrOx8.
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