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To cite this article: Alina I. Amirova, Olga V. Golub, Tatyana U. Kirila, Alla B. Razina, Andrey V. Tenkovtsev & Alexander P. Filippov (2015): The influence of arm length and number on starshaped poly(2-isopropyl-2-oxazoline) aggregation in aqueous solutions near cloud point, Soft Materials, Abstract: Four-arm star-shaped poly(2-isopropyl-2-oxazolines) (PiPrOx 4 ) are synthesized by cationic polymerization on t-butylcalix[4]arene macroinitiator. The obtained samples differ by polymerization degree of arms N PiPrOx = 9 and 25 and are characterized in chloroform. The behavior in aqueous solutions is studied by light scattering methods and compared with the results of investigation of eight-arm star with similar structure. Three types of particles are observed in solution of short-arm PiPrOx 4 at room temperature, whereas only two particle types are present in long-arm star solution. Arm shortening leads to widening of the phase transition interval. The arm number decreasing reduces the phase transition temperature by 1°C.