Self-organization of thermosensitive star-shaped poly(2-isopropyl-2-oxazolines) influenced by arm number and generation of carbosilane dendrimer core in aqueous solutions

摘要

Self-organization of diphilic star-shaped poly(2-isopropyl-2-oxazoline) with carbosilane dendrimer core was investigated in aqueous solutions on heating by light scattering and turbidimetry methods. The temperature dependences of light scattering intensity, optical transmittance, hydrodynamic radii of each type of particles and their contribution to integral light scattering intensity were obtained. The phase separation temperatures were determined at concentration ranging from 0.00023 to 0.0135 g cm(-3). It is shown that these temperatures are higher than for the eight-arm analog because of the different degree of hydrophobic core shielding by hydrophilic arms.