Tuning the morphology of segmented block copolymers with Zr-MOF nanoparticles for durable and efficient hydrocarbon separation membranes

2020 ◽  
Vol 8 (18) ◽  
pp. 9382-9391 ◽  
Author(s):  
Ali Pournaghshband Isfahani ◽  
Morteza Sadeghi ◽  
Somaye Nilouyal ◽  
Guoji Huang ◽  
Ansori Muchtar ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Gas Solubility ◽  
Polymer Morphology ◽  
Separation Membranes

PU/UiO66-NH2 membranes demonstrate exceptional C4H10/CH4 selectivity due to the enhanced gas solubility associated with MOFs and tuning the polymer morphology.

scholarly journals Organosilica-Modified Multiblock Copolymers for Membrane Gas Separation

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3579
Author(s):  
Ilsia M. Davletbaeva ◽  
Alexander Yu. Alentiev ◽  
Zulfiya Z. Faizulina ◽  
Ilnaz I. Zaripov ◽  
Roman Yu. Nikiforov ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Toluene Diisocyanate ◽  
Multiblock Copolymers ◽  
Gas Solubility ◽  
Membrane Gas Separation ◽  
Modified Polymers ◽  
Temperature Relaxation ◽  
Solubility Coefficients ◽  
Modified Block ◽  
The Ideal

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.

scholarly journals Synthesis and Study of Gas Transport Properties of Polymers Based on Macroinitiators and 2,4-Toluene Diisocyanate

Membranes ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 42 ◽  
Author(s):  
Ilsiya M. Davletbaeva ◽  
Ilnaz I. Zaripov ◽  
Alexander I. Mazilnikov ◽  
Ruslan S. Davletbaev ◽  
Raphael R. Sharifullin ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Gas Separation ◽  
Gas Transport ◽  
Toluene Diisocyanate ◽  
Great Promise ◽  
Internal Cavity ◽  
Polar Molecules ◽  
Supramolecular Organization ◽  
Membrane Gas Separation ◽  
Separation Membranes

Nowadays, block copolymers hold great promise for the design of novel membranes to be applied for the membrane gas separation. In this regard, microporous block copolymers based on a macroinitiator with an anionic nature, such as potassium-substituted block copolymers of propylene oxide and ethylene oxide (PPEG) and 2,4-toluene diisocyanate (TDI), were obtained and investigated as effective gas separation membranes. The key element of the macromolecular structure that determines the supramolecular organization of the studied polymers is the coplanar blocks of polyisocyanates with an acetal nature (O-polyisocyanate). In the present research, the influence of the content of peripheral polyoxyethylene (POE) blocks in PPEG on the supramolecular structure processes and gas transport characteristics of the obtained polymers based on PPEG and TDI was investigated. According to the study of polymers if the POE block content is 15 wt %, the polyoxypropylene segments are located in the internal cavity of voids formed by O-polyisocyanate blocks. When the POE block content is 30 wt %, the flexible chain component forms its own microphase outside the segregation zone of the rigid O-polyisocyanate blocks. The permeability for polar molecules, such as ammonia or hydrogen sulfide, significantly exceeds the permeability values obtained for non-polar molecules He, N2 and СН4. A relatively high permeability is also observed for carbon dioxide. At the same time, the content of POE blocks has a small effect on the permeability for all studied gases. The diffusion coefficient increases with an increase in the POE block content in PPEG for all studied gases.

Polymer Morphology Revealed by Staining Techniques

1981 ◽  
Vol 39 ◽  
pp. 340-341
Author(s):  
A. C. Reimschuessel ◽  
V. Kramer
Keyword(s):  
Polymer Melt ◽  
Nylon 6 ◽  
Morphological Features ◽  
Negative Staining ◽  
Polymer Morphology ◽  
Crystallizable Polymer ◽  
Staining Techniques ◽  
Long Chain

Staining techniques can be used for either the identification of different polymers or for the differentiation of specific morphological domains within a given polymer. To reveal morphological features in nylon 6, we choose a technique based upon diffusion of the staining agent into accessible regions of the polymer.When a crystallizable polymer - such as nylon 6 - is cooled from the melt, lamellae form by chainfolding of the crystallizing long chain macromolecules. The regions between adjacent lamellae represent the less ordered amorphous domains into which stain can diffuse. In this process the lamellae will be “outlined” by the dense stain, giving rise to contrast comparable to that obtained by “negative” staining techniques.If the cooling of the polymer melt proceeds relatively slowly - as in molding operations - the lamellae are usually arranged in a radial manner. This morphology is referred to as spherulitic.

Design and Characterization of LSM-ScCeSZ Nanocomposite as MIEC Material for SOFC Cathode and Oxygen-separation Membranes

2008 ◽  
Author(s):  
Vladislav A. Sadykov ◽  
Vitalii Muzykantov ◽  
Aleksei Bovin ◽  
Lubsan Batuev ◽  
Galina Alikina ◽  
...  
Keyword(s):  
Oxygen Separation ◽  
Sofc Cathode ◽  
Separation Membranes

Self-Assembly of Hydrogels From Elastin-Mimetic Block Copolymers

2002 ◽  
Vol 724 ◽  
Author(s):  
Elizabeth R. Wright ◽  
R. Andrew McMillan ◽  
Alan Cooper ◽  
Robert P. Apkarian ◽  
Vincent P. Conticello
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Variable Temperature ◽  
Inverse Temperature ◽  
Temperature Transition ◽  
Scanning Calorimetry ◽  
Design Synthesis ◽  
Inverse Temperature Transition ◽  
Functional Biomaterials

AbstractTriblock copolymers have traditionally been synthesized with conventional organic components. However, triblock copolymers could be synthesized by the incorporation of two incompatible protein-based polymers. The polypeptides would differ in their hydrophobicity and confer unique physiochemical properties to the resultant materials. One protein-based polymer, based on a sequence of native elastin, that has been utilized in the synthesis of biomaterials is poly (Valine-Proline-Glycine-ValineGlycine) or poly(VPGVG) [1]. This polypeptide has been shown to have an inverse temperature transition that can be adjusted by non-conservative amino acid substitutions in the fourth position [2]. By combining polypeptide blocks with different inverse temperature transition values due to hydrophobicity differences, we expect to produce amphiphilic polypeptides capable of self-assembly into hydrogels. Our research examines the design, synthesis and characterization of elastin-mimetic block copolymers as functional biomaterials. The methods that are used for the characterization include variable temperature 1D and 2D High-Resolution-NMR, cryo-High Resolutions Scanning Electron Microscopy and Differential Scanning Calorimetry.

Use of Nonionic Block Copolymers in Vaccines and Therapeutics

1998 ◽  
Vol 15 (2) ◽  
pp. 89-142 ◽  
Author(s):  
Mark J. Newman ◽  
Jeffrey K. Actor ◽  
Mannersamy Balusubramanian ◽  
Chinnaswamy Jagannath
Keyword(s):  
Block Copolymers

Mechanical and Structural Consequences of Associative Dynamic Cross-Linking in Acrylic Diblock Copolymers

2019 ◽  
Author(s):  
Jacob Ishibashi ◽  
Yan Fang ◽  
Julia Kalow
Keyword(s):  
Block Copolymers ◽  
Rheological Properties ◽  
Diblock Copolymers ◽  
Cross Linking ◽  
Statistical Copolymer

<p>Block copolymers are used to construct covalent adaptable networks that employ associative exchange chemistry (vitrimers). The resulting vitrimers display markedly different nanostructural, thermal and rheological properties relative to those of their statistical copolymer-derived counterparts. This study demonstrates that prepolymer sequence is a versatile strategy to modify the properties of vitrimers.</p>

Sign in / Sign up

Export Citation Format

Share Document