Nanomaterials based on nano-ion hydrophylic polymer interactions

Abstract

The Thesis deals with the co-assembly of triblock copolymers poly(2-(N, N, N′, N′-tetramethyl guanidinium)ethyl acrylate)-b-poly(ethylene oxide)-b-poly(2-(N, N, N′, N′-tetramethyl guanidinium)ethyl acrylate), PGEA-PEO-PGEA, and poly(N-isopropylacrylamide)-b- poly(acrylic acid)-b-poly(N-isopropylacrylamide), PNIPAM-PAA-PNIPAM, with anionic boron cluster compounds closo-dodecaborate anion, [B12H12]2- , and [cobalt(3+) bis(1,2- dicarbollide)] anion, COSAN, in aqueous solutions, respectively. Synthesis of PNIPAM-PAA- PNIPAM triblock copolymers was performed. The formation of gels based on electrostatic interactions of cationic blocks of PGEA-PEO-PGEA copolymer with closo-dodecaborate anion and on dihydrogen bonding of neutral PNIPAM blocks of PNIPAM-PEO-PNIPAM with COSAN was investigated. The inner structure of the gels was investigated by scattering techniques and fluorescent spectroscopy. Their mechanical properties were studied by diverse rheology measurements. Influence of lithium and sodium salts on PEO/COSAN complex formation and stability in aqueous solution was also studied