A5074542896- Polymer composites and self-healing
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Supramolecular Self-Assembly in Materials
- Supramolecular Chemistry and Complexes
- Polydiacetylene-based materials and applications
- Luminescence and Fluorescent Materials
- biodegradable polymer synthesis and properties
- Dendrimers and Hyperbranched Polymers
- Advanced Polymer Synthesis and Characterization
- Synthetic Organic Chemistry Methods
- Chemical Synthesis and Analysis
- Synthesis and properties of polymers
- Molecular Sensors and Ion Detection
- Photochromic and Fluorescence Chemistry
- Metal-Organic Frameworks: Synthesis and Applications
- Adenosine and Purinergic Signaling
- Covalent Organic Framework Applications
- Silicone and Siloxane Chemistry
- Crystallography and molecular interactions
- Fluorine in Organic Chemistry
- Conducting polymers and applications
- Photopolymerization techniques and applications
- Advanced Sensor and Energy Harvesting Materials
- Flame retardant materials and properties
University of Sussex
2017-2025
University of Reading
2010-2020
Reading Museum
2014-2018
Diamond Light Source
2017
Defence Academy of the United Kingdom
2017
Cranfield University
2017
Imperial College London
2005-2010
University of Delaware
2010
Case Western Reserve University
2010
Northwestern University
2009
An elastomeric, healable, supramolecular polymer blend comprising a chain-folding polyimide and telechelic polyurethane with pyrenyl end groups is compatibilized by aromatic π−π stacking between the π-electron-deficient diimide π-electron-rich units. This interpolymer interaction key to forming tough, elastomeric material. Variable-temperature FTIR analysis of bulk material also conclusively demonstrates presence hydrogen bonding, which complements interactions. SAXS shows that healable...
A novel supramolecular polymer system, in which the terminal pyrenyl groups of a polyamide intercalate into chain-folds polyimide via electronically-complementary pi-pi stacking, shows both enhanced mechanical properties relative to those its individual components and facile healing characteristics as result thermoreversibility non-covalent interactions.
A supramolecular polymer blend, formed via π-π interactions between a π-electron rich pyrenyl end-capped oligomer and chain-folding containing pairs of poor naphthalene-diimide (NDI) units, has been reinforced with cellulose nanocrystals (CNCs) to afford healable nanocomposite material. Nanocomposites varying weight percentage CNCs (from 1.25 20.0 wt %) within the polymeric matrix have prepared solvent casting followed by compression molding, their mechanical properties healing behavior...
A supramolecular elastomer comprising a blend of pyrenyl-tweezer-ended polyamide intercalating with chain-folding polyimide shows near-quantitative thermal healability. It also exhibits greatly enhanced toughness relative to an analogous system in which the end-groups are simple pyrenyl residues, reflecting increased association constant between two complementary binding motifs.
Utilising supramolecular π–π stacking interactions to drive miscibility in two-component polymer blends offers a novel approach producing materials with unique properties. We report this paper the preparation of network that exploits principle. A low molecular weight polydiimide which contains multiple π-electron-poor receptor sites along its backbone forms homogeneous films siloxane features π-electron-rich pyrenyl end-groups. Compatibility results from complexation process involves...
This mini-review details the recent development of self-healing and mendable polymeric materials which take advantage reversible characteristics non-covalent interactions during their physical recovery process. Supramolecular polymer systems undergo spontaneous (autonomous) healing, as well those require external stimuli to initiate healing process (healable/mendable), are introduced discussed. polymers offer key advantages over alternative approaches, these can typically withstand multiple...
This perspectives article reviews selected key examples from the field of supramolecular polymer chemistry with specific focus on use dynamic properties that these materials possess in real-world applications. The scope application for fascinating materials, typically networks held place by numerous weak, non-covalent bonds, has proven to be extremely diverse – significant effort past twenty years enabled polymers now found developmental adhesives, batteries, anti-fouling coatings, healable...
A series of six low-molecular-weight elastomers with hydrogen bonding end groups have been designed, synthesized, and studied. The poly(urethane)-based all contained essentially the same hard block content (ca. 11%) differ only in nature their groups. Solution-state 1H NMR spectroscopic analysis model compounds featuring demonstrates that they exhibit very low binding constants range 1.4 to 45.0 M−1 CDCl3, yet corresponding each possess a markedly different nanoscale morphology rheology...
Mechanical properties of healable supramolecular polymer blends correlate to non-covalent “crosslink density”.
A focused library of potential hydrogelators each containing two substituted aromatic residues separated by a urea or thiourea linkage have been synthesised and characterized. Six these novel compounds are highly efficient hydrogelators, forming gels in aqueous solution at low concentrations (0.03-0.60 wt%). Gels were formed through pH switching methodology, acidification basic (pH 14 to ≈ 4) either addition HCl via the slow hydrolysis glucono-δ-lactone. Frequently, gelation was accompanied...
The dipeptide l-carnosine has a number of important biological properties. Here, we explore the effect attachment bulky hydrophobic aromatic unit, Fmoc [N-(fluorenyl-9-methoxycarbonyl)] on self-assembly Fmoc-l-carnosine, i.e., Fmoc-β-alanine-histidine (Fmoc-βAH). It is shown that Fmoc-βAH forms well-defined amyloid fibrils containing β sheets above critical aggregation concentration, which determined from pyrene and ThT fluorescence experiments. Twisted were imaged by cryogenic transmission...
A new, healable, supramolecular nanocomposite material has been developed and evaluated. The comprises a blend of three components: pyrene-functionalized polyamide, polydiimide gold nanoparticles (P-AuNPs). polymeric components interact by forming well-defined π–π stacked complexes between π-electron rich pyrenyl residues deficient residues. Solution studies in the mixed solvent chloroform–hexafluoroisopropanol (6 : 1, v/v) show that mixing (each which is soluble isolation), results...
A polyurethane-based adhesive has been produced that can undergo multiple thermal debonding/bonding cycles and also irreversibly debond through depolymerisation on contact with fluoride ions.
The P2X purinergic receptor 7 (P2X7) has an essential role in inflammation, innate immunity, tumor progression, neurodegenerative diseases, and several other leading subsequently to the development of P2X7 modulators. AZ11645373 is a frequently studied antagonist tool compound but always used as racemic mixture. Racemic can be separated into its respective enantiomers by chiral chromatography, albeit small batches, these were stereochemically intact over two years later, high-performance...
A novel, pyrene-functionalised copolymer has been synthesised in a single step via imidisation of poly(maleic anhydride-alt-1-octadecene) with 1-pyrenemethylamine, and its potential for the detection volatile nitro aromatic compounds (NACs) evaluated. The new forms complexes solution NACs such as 2,5-dinitrobenzonitrile, shown by (1) H NMR, UV-vis fluorescence spectroscopy. Moreover, thin films this copolymer, cast from THF solution, undergo almost instantaneous quenching when exposed to...
Electronically complementary, low molecular weight polymers that self-assemble through tunable π–π stacking interactions to form extended supramolecular polymer networks have been developed for inkjet printing applications and successfully deposited using three different techniques. Sequential overprinting of the complementary components results in network formation complexation π-electron rich pyrenyl or perylenyl chain-ends one component with deficient naphthalene diimide residues a...
This paper details the synthesis, characterisation and physical analyses of a series hydrogen bonded urethane supramolecular polymer systems that are created by facile one-step synthesis from inexpensive commercially available starting materials. We report low molecular weight bisurethanes (<650 a.m.u.) exhibit properties in bulk characteristic polyurethane materials possessing far higher weight. The characteristics these were investigated using temperature-dependent rheological analysis...
A thermoresponsive, supramolecular nanocomposite has been prepared by the addition of pyrenyl functionalized gold nanoparticles (AuNPs) to a polydiimide that contains receptor residues designed form defined complexes with pyrene. The novel pyrenyl-functionalized AuNPs (P-AuNPs) were characterized transmission electron microscopy, surface functionalization confirmed infrared and UV–visible spectroscopic analyses. Mixing solutions P-AuNPs π-electron-deficient resulted in formation...
Self-complementary tweezer-molecules based on a naphthalenediimide core self-assemble into supramolecular dimers through mutual π-π-stacking and hydrogen bonding. The resulting motif is extremely stable in solution (K(a) = 10(5) M(-1)), its attachment to one terminal position of poly(ethylene glycol) chain leads doubling the polymer's apparent molecular weight.
Four alkyl substituted β-lactones were investigated in ring opening polymerisation to produce a family of poly(3-hydroxyalkanoate)s and their block copolymers.