ABA Type Amphiphiles with Poly(2?benzhydryl?2?oxazine) Moieties: Synthesis, Characterization and Inverse Thermogelation

Thermoresponsive polymers are frequently involved in the development of materials for various applications. Here, containing poly(2- benzhydryl-2-oxazine) (pBhOzi) repeating units described first time. The homopolymer pBhOzi and an ABA type amphiphile comprising two flanking hydrophilic A blocks poly(2-methyl-2-oxazoline) (pMeOx) hydrophobic aromatic central B block (pMeOx-b-pBhOzi-b-pMeOx) synthesized latter is shown to exhibit inverse thermogelling properties at concentrations 20 wt.% water. This behavior stands contrast a homologue consisting poly(2-benzhydryl-2-oxazoline) (pMeOx-b-pBhOx-b-pMeOx). No observed with this polymer even 25 wt.%. For pMeOx-b-pBhOzi-b-pMeOx, surprisingly high storage modulus ?22 kPa values yield flow points 480 Pa 1.3 obtained. Exceeding point, pronounced shear thinning observed. Interestingly, only little difference between self-assemblies pMeOx-b-pBhOzi-b-pMeOx pMeOx-b-pBhOx-b-pMeOx by dynamic light scattering while transmission electron microscopy images suggest that micelles interact through their coronas, which probably decisive gel formation. Overall, study introduces new building poly(2-oxazoline) poly(2-oxazine)-based self-assemblies, but additional studies will be needed unravel exact mechanism.