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Organosilica-Modified Multiblock Copolymers for Membrane Gas Separation
Ilsiya M Davletbaeva1, Alexander Yu Alentiev2, Zulfiya Z Faizulina1
1Department of Technology of Synthetic Rubber, Kazan National Research Technological University, 68 Karl Marx str, 420015 Kazan, Russia.
Polymers
|October 23, 2021
Summary
Organosubstituted silica derivatives modify block copolymers, enhancing gas separation. These silica modifiers improve CO2/N2 selectivity, showing promise for flue gas treatment.
Area of Science:
- Polymer Chemistry
- Materials Science
- Nanotechnology
Background:
- Block copolymers are versatile materials with tunable properties.
- Organosubstituted silica derivatives offer unique functionalities for material modification.
- Controlling polymer structure is key to optimizing material performance.
Purpose of the Study:
- To synthesize and investigate organosubstituted silica derivatives as modifiers for block copolymers.
- To analyze the impact of these silica modifiers on polymer structure and properties.
- To evaluate the potential of modified block copolymers for gas separation applications.
Main Methods:
- Synthesis of organosubstituted silica derivatives.
- Modification of block copolymers using macroinitiator and 2,4-toluene diisocyanate.
- Analysis of high-temperature relaxation, α-transitions, and supramolecular structure.
- Measurement of gas transport properties (permeability, diffusion, solubility) and selectivity.
Main Results:
- Modified block copolymers exhibit coplanar rigid polyisocyanate blocks (O-polyisocyanates).
- Organosubstituted silica derivatives show non-additive effects on thermal transitions and influence supramolecular structure.
- Gas permeability increases due to enhanced diffusion, while solubility remains constant.
- Ideal selectivity for gas pairs improves, notably a 1.5-fold increase for CO2/N2 (25 to 39).
Conclusions:
- Organosubstituted silica derivatives effectively modify block copolymer properties.
- The developed materials demonstrate significant potential for efficient flue gas separation, particularly for CO2/N2 mixtures.
- The findings highlight a novel approach to designing advanced materials for gas separation technologies.
