Supramolecular architecture of polymers as the basis of obtaining mesoporous polymers

Abstract

Self-organization and arrangement of supramolecular structures from blockcopolymers are some of the ways used for the development of nanoporous and mesoporous polymers. Herein, reactive olygomers can play the key role in the design of supramolecular arranging of polymers. Optically transparent mesoporuos block-copolymers with adjusted free volume are obtained by the polyaddition of 2,4-toluene diisocyanate (TDI) to anionic macroinitiators. The mechanism of polyaddition of TDI to an anionic macroinitiator in various chemical solvents was studied by infrared spectroscopy. It is established that the reaction of forming polyisocyanate blocks of acetal nature (O-polyisocyanate) and stabilization of end O-polyisocyanate chains are based on the formation of voids in polymer. The formation of voids is conditioned by the geometry of self-organization of block-copolymers containing end potassium-O-polyisocyanates stabilized by crown ether fragments. The formation of urea with the participation of isocyanate groups of ortho-location of TDI is one of the main factors of the stabilization of O-polyisocyanate blocks. The investigation of the polymer sorption properties was carried out by electron spectroscopy. As an adsorbed dye Rhodamine 6G was used. The ability of Rhodamine 6G to sorb depended on the content of the O-polyisocyanate component in the polymer. Mesoporous polymers demonstrated high efficiency as an optically transparent matrix for laser-active media with high radiation stability. Rhodamine 6G in mesoporous polymers retains spectral luminescent properties and generates laser radiation during excitation by the second harmonic of Nd:YAG laser.

Synthesis and properties of novel polyurethanes based on amino ethers of boric acid for gas separation membranes

“…23,24 The goal of the current work is to obtain hydrolytically stable amino ethers of boronic acid by introducing the aforementioned steric hindrance, and using these materials toward the synthesis of polyurethanes to be tested as a gas separation membranes for ammonia and carbon dioxide. As shown in previous literature [25][26][27][28][29] polyurethane one is the attractive polymer to make such composites.…”

The Effect of Microporous Polymeric Support Modification on Surface and Gas Transport Properties of Supported Ionic Liquid Membranes

“…Previously, the reaction of toluene 2,4-diisocyanate with macroinitiators was studied, in which the block copolymers of propylene and ethylene oxide (PPEG) containing terminal hydroxyl groups are partially replaced by potassium alcoholate groups [ 37 ]. In numerous previous works [ 38 , 39 , 40 ], the conditions of acetal (O-polyisocyanates) and amide (N-polyisocyanates) polyisocyanates formation have been investigated to prove the result of isocyanate groups opening along the C=O or C=N bonds, respectively. These studies have elucidated that the isocyanate group opening depends strongly on the reaction conditions employed (temperature, solvent, or presence of co-catalyst).…”

Amphiphilic Poly(dimethylsiloxane-ethylene-propylene oxide)-polyisocyanurate Cross-Linked Block Copolymers in a Membrane Gas Separation

“…Membranes based on polyorganosiloxane block copolymers can exhibit high permeability for various gases and good mechanical strength [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. Basically, polyorganosiloxane block copolymers are heterogeneous systems.…”

“…The wide possibilities for controlling both the macromolecular and supramolecular structures are associated with multiblock copolymers obtained on the basis of terminated by potassium–alcoholate groups of triblock copolymers of propylene and ethylene oxides (PPEG) and 2,4-toluene diisocyanate (TDI) [ 15 , 37 , 38 , 39 ]. The high activity of the potassium-alcoholate groups of PPEG in the reactions of the opening of isocyanate groups initiated by them by the anionic mechanism was established.…”