Study on Novel Multicoponent Polymer Networks

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We have proposed a novel methodology (electrostatic self-assembly and covalent fixation) to produce various non-linear polymer topologies, including multicomponent polymer networks, with exceptionally high efficiency by exploiting the self-assembly principle to preorganize linear polymer precursors and subsequently converting them into covalently linked permanent structures. Thus new telechelic polymer precursors having moderately strained cyclic onium salt groups, including five-membered cyclic or six-membered bicyclic ammonium salt groups, as single or both end groups were prepared and subjected to an ion-exchange reaction to introduce multifunctional carboxylate anions as a counteranion. The electrostatically self-assembled products were then subjected, either directly or after subsequent manipulation, to heat treatment to convert the ionic interaction into the covalent linkage through the ring-opening reaction of the cyclic ammonium salt group by the carboxylate counteranion to pro … More duce a variety of branched and network homopolymers and copolymers with the precisely controlled structures. Furthermore, we have developed efficient initiators for the synthesis of a trifunctionally living poly(THF) and of a bifunctionally living poly (THF) having an additional functional group, and subsequent end-capping reaction for the synthesis of star-shaped telechelic and α, ω, kentro-telechelic polymers.We have also applied this "electrostatic self-assembly and covalent fixation" strategy for designing various non-linear polymer topologies, including monocyclic and polycyclic polymers, cyclic macromonomers and cyclic telechelics (kyklo-telechelics) and polymeric topological isomers. Thus, a variety of electrostatic self-assemblies of these polymer precursors, formed particularly in a diluted organic solution, was subjected to the heat treatment to convert the ionic interaction into the covalent linkage by the ring-opening reaction, to produce topologically unique, non-linear polymer architectures in high efficiency. Less