A5025831416- Membrane Separation and Gas Transport
- Covalent Organic Framework Applications
- Membrane Separation Technologies
- Metal-Organic Frameworks: Synthesis and Applications
- Muon and positron interactions and applications
- Graphene research and applications
- Synthesis and properties of polymers
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Zeolite Catalysis and Synthesis
- Membrane-based Ion Separation Techniques
- Surfactants and Colloidal Systems
- Fuel Cells and Related Materials
- Chemical Synthesis and Characterization
- Dielectric materials and actuators
- Crystallization and Solubility Studies
- Electrostatics and Colloid Interactions
- Mesoporous Materials and Catalysis
- X-ray Diffraction in Crystallography
- Extraction and Separation Processes
- Polymer crystallization and properties
- Polysaccharides Composition and Applications
- Polymer Nanocomposites and Properties
- Luminescence and Fluorescent Materials
- Porphyrin and Phthalocyanine Chemistry
University of Manchester
2016-2025
King Abdullah University of Science and Technology
2021
Institute on Membrane Technology
2012
University of Liverpool
2012
Cardiff University
2006-2008
Universidade Federal do Ceará
2004
University of Salford
2004
BP (United Kingdom)
1985-1989
Microporous materials can be derived directly from soluble polymers whose randomly contorted shapes prevent an efficient packing of the macromolecules in solid state.
A polymer with a rigid, randomly contorted molecular structure (see Figure), incorporating fused rings connected by spiro‐centres, may be precipitated or cast from solution to give microporous powders and membranes stable up temperatures of 350 °C, apparent surface areas > 600 m 2 g –1 . Organophilic formed, as demonstrated the separation phenol water pervaporation.
The past decade has seen the development of microporous materials (i.e., containing pores dimensions <2 nm) derived wholly from organic components. Here we review this nascent area with a particular emphasis on amorphous polymers that possess intrinsic microporosity (IM), which is defined as arises directly shape and rigidity component macromolecules. Although IM can be readily identified within soluble non-network oligomers, for network it harder to differentiate template effects are...
Novel types of microporous material are required for chemoselective adsorptions, separations and heterogeneous catalysis. This concept article describes recent research directed towards the synthesis polymeric materials that possess microporosity is intrinsic to their molecular structures. These polymers (PIMs) can exhibit analogous behaviour conventional materials, but, in addition, may be processed into convenient forms use as membranes. The excellent performance these membranes gas...
Three structurally diverse polymers of intrinsic microporosity reversibly adsorb significant quantities hydrogen (1.4–1.7 % by mass at 77 K) and represent the first examples a new type purely organic storage material, which can be tailored to meet specific requirements physisorption. A major technical obstacle widespread use (H2) as nonpolluting fuel for cars is lack safe efficient system on-board storage.1 Of many potential solutions being investigated,2 an attractive possibility based on...
The concept of free volume is useful for explaining aspects the chain mobility and permeability polymers, even though its precise definition subject to debate. Polymers that trap a large amount interconnected in glassy state behave many respects like microporous materials potentially find application membrane separations heterogeneous catalysis. development outlined new type polymer, which molecular structure contains sites contortion (e.g. spiro-centres) within rigid backbone ladder...
For gas separation membranes, materials are required that offer high permeability as well good selectivity for a desired separation. glassy polymers, the transport properties depend on amount and distribution of free volume chain mobility. The most highly permeable polymers have rigid, twisted macromolecular backbones give rise to microvoids. Examples include substituted polyacetylenes, perfluoropolymers, addition-type polynorbornene, intrinsic microporosity (PIMs) some polyimides. High...
Membranes with high permeability to gases are formed from polyimides rigid backbones that incorporate a spiro-centre. A route this new range of high-free-volume is demonstrated, and exceptional performance obtained for polymer containing dimethyl binaphthyl unit.
Organic–organic composite membranes are prepared by in situ crystallization of cage molecules a polymer intrinsic microporosity. This allows direct one-step route to mixed-matrix membranes, starting with homogeneous molecular solution. Extremely high gas permeabilities achieved, even after ageing for more than year, coupled good selectivity applications such as CO2 recovery.
Tackling the wastewater challenge in polymer membrane manufacturing with a continuous adsorption process.
We report the synthesis and properties of network polymers intrinsic microporosity (network−PIMs) derived from triptycene monomers that possess alkyl groups attached to their bridgehead positions. Gas adsorption can be controlled by length branching chains so apparent BET surface area materials tuned within range 618−1760 m2 g−1. Shorter (e.g., methyl) or branched isopropyl) provide greatest microporosity, whereas longer appear block created rigid organic framework. The enhanced in...
A range of polyimides with characteristics similar to a polymer intrinsic microporosity (PIM) were prepared by reaction various aromatic diamines bis(carboxylic anhydride) incorporating spiro-center. The polymers exhibited high surface area, as determined nitrogen adsorption, and thermal stability. Membrane gas permeation experiments showed PIM-polyimides be among the most permeable all have selectivities close upper bound for several important pairs. group contribution method was used...
A novel polymer of intrinsic microporosity, thioamide-PIM-1, has been prepared by postmodification PIM-1, using phosphorus pentasulfide as a thionating agent in the presence sodium sulfite. The chemistry was first tested on low molecular weight model compound, 3,13-dicyanobenzo-1,2,4′,5′-bis(1,4-benzodioxane). For polymer, up to 80% conversion nitrile thioamide achieved. Modification leads reduction BET surface area from 770 m2 g–1 for parent PIM-1 263 thioamide. After modification, is no...
Nitrile groups in the polymer of intrinsic microporosity PIM-1 were reduced to primary amines using borane complexes. In adsorption experiments, novel amine-PIM-1 showed higher CO2 uptake and CO2/N2 sorption selectivity than parent polymer, with very evident dual-mode behavior. gas permeation six light gases, individual contributions solubility diffusion overall permeability was determined via time-lag analysis. The high affinity drastically restricts at low pressures lowers compared PIM-1....
A novel triptycene-based polymer of intrinsic microporosity (Trip-PIM) displays enhanced surface area (1065 m2 g(-1)) and reversibly adsorbs 1.65% hydrogen by mass at 1 bar/77 K 2.71% 10 K.
Cobalt phthalocyanine and iron porphyrin network polymers of intrinsic microporosity (network-PIMs) were prepared their performance as heterogeneous catalysts compared with that low molar mass analogues. Spiro-linked Co network-PIMs from preformed chlorinated phthalocyanines showed lower surface areas catalytic activity than those by a phthalocyanine-forming reaction rigid precursor incorporating spiro-centre. However, all the much more effective for decomposition hydrogen peroxide,...
The challenge of storing hydrogen at high volumetric and gravimetric density for automotive applications has prompted investigations into the potential cryo-adsorption on internal surface area microporous organic polymers. A range Polymers Intrinsic Microporosity (PIMs) been studied, best PIM to date (a network-PIM incorporating a triptycene subunit) taking up 2.7% H2 by mass 10 bar/77 K. HyperCrosslinked (HCPs) also show promising performance as storage materials, particularly pressures >10...