Abstract
Organosubstituted silica derivatives were synthesized and investigated as modifiers of block copolymers based on macroinitiator and 2,4-toluene diisocyanate. A peculiarity of the modified block copolymers is the existence in their structure of coplanar rigid polyisocyanate blocks of acetal nature (O-polyisocyanates). Organosubstituted silica derivatives have a non-additive effect on high-temperature relaxation and α-transitions of modified polymers and exhibit the ability to influence the supramolecular structure of block copolymers. The use of the developed modifiers leads to a change in the gas transport properties of block copolymers. The increase of the permeability coefficients is due to the increase of the diffusion coefficients. At the same time, the gas solubility coefficients do not change. An increase in the ideal selectivity for a number of gas pairs is observed. An increase in the selectivity for the CO2/N2 gas pair (from 25 to 39) by 1.5 times demonstrates the promising use of this material for flue gases separation.
Highlights
Nowadays, multiblock copolymers (MBCs) capable of forming a wide variety of supramolecular structures are of great interest to researchers [1,2,3,4]
The results indicate the active effect of the ASiP–AGM-10 on the supramolecular structure of block copolymers
The ASiP–AGM was synthesized by consistent exchange of tetraethoxysilane with
Summary
Multiblock copolymers (MBCs) capable of forming a wide variety of supramolecular structures are of great interest to researchers [1,2,3,4]. Segments combination of block copolymers differing in chemical structure has great potential for creating new supramolecular structures and controlling their morphology [5]. Chain growth mechanisms are under special attention by developing methods for the production of new multiblock copolymers [6,7]. The simplest method of multiblock copolymers preparation is in the usage of macromonomers or macroinitiators in conventional stepwise growth polymerization [8,9]. Multiblock copolymers can be used as structural materials, adhesives, emulsifiers, modifiers, drug-delivery materials and gas-transport membranes [10,11,12,13,14]
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