A5028588698- biodegradable polymer synthesis and properties
- Carbon dioxide utilization in catalysis
- Organometallic Complex Synthesis and Catalysis
- Additive Manufacturing and 3D Printing Technologies
- Photopolymerization techniques and applications
- Polymer crystallization and properties
- Photochromic and Fluorescence Chemistry
- X-ray Diffraction in Crystallography
- Advanced Polymer Synthesis and Characterization
- Microplastics and Plastic Pollution
- Recycling and Waste Management Techniques
- Cyclopropane Reaction Mechanisms
- Crystallization and Solubility Studies
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Synthetic Organic Chemistry Methods
- Fluorine in Organic Chemistry
University of Birmingham
2019-2022
Boston College
2016-2018
Chestnut Hill College
2016-2017
Stonehill College
2014
Abstract A cationic iron(III) complex was active for the polymerization of various epoxides, whereas analogous neutral iron(II) inactive. Cyclohexene oxide could be “switched off” upon in situ reduction catalyst and on” oxidation, which is orthogonal to what observed previously lactide polymerization. Conducting copolymerization reactions presence both monomers resulted block copolymers whose identity can controlled by oxidation state catalyst: selective epoxide state. Evidence formation...
Limiting our plastic waste and finding greener, more sustainable solutions for disposal is a current environmental priority.
Thiol–ene ‘click’ reactions between terpenes and a four-arm thiol were utilized to produced thermoset 3D printed structures using vat photopolymerisation.
Biosourced materials are gaining interest industrially, but there still limitations on the library of available suitable for advanced manufacturing, especially using photopolymerization-based processing techniques. Terpenes, such as myrcene, naturally produced possessing structural features, specifically alkenes, that avail themselves Free-radical and anionic polymerization techniques were used to explore molecular architecture, branching, well weight dispersity physical properties prior...
Organocatalysis provides robust methodology to furnish "greener" routes polymer synthesis. However, the application toward synthesis of aromatic polymers via step-growth polymerization is an area that justifies more investigation, as a consequence poor thermal stability many organic catalysts and high reaction temperatures commonly required. In this study, thermally stable salts consisting base acid were explored understand key elements required for bulk poly(ethylene terephthalate) (PET) at...
The reactivity of iron-based ring opening polymerization catalysts is compared when the catalyst in three different oxidation states. Formally iron(i) monoalkoxide complexes 3a (p-methoxyphenoxide) and 3b (neopentoxide) supported by bis(imino)pyridine ligands were synthesized investigated as for copolymerization various monomers. For most monomers, superior to analogous, formally iron(ii) iron(iii) (1a/1b 2a/2b, respectively) cyclic ester carbonate Experimental computational investigation...
A unique redox-triggered crosslinking reaction is disclosed that capitalizes on the orthogonal reactivity of an iron-based catalyst for ring opening polymerization cyclic diesters and epoxides.
Abstract A cationic iron(III) complex was active for the polymerization of various epoxides, whereas analogous neutral iron(II) inactive. Cyclohexene oxide could be “switched off” upon in situ reduction catalyst and on” oxidation, which is orthogonal to what observed previously lactide polymerization. Conducting copolymerization reactions presence both monomers resulted block copolymers whose identity can controlled by oxidation state catalyst: selective epoxide state. Evidence formation...
Density functional theory (DFT) is employed to characterize in detail the mechanism for ring-opening polymerization (ROP) of ε-caprolactone catalyzed by iron alkoxide complexes bearing redox-active bis(imino)pyridine ligands. The combination with non-innocent ligand permits comparison catalytic activity as a function oxidation state (and overall spin state). reactivities aryl oxide versus initiators ROP are also examined. An experimental test computational prediction reveals an Fe(III)...
Placement of an electron-withdrawing trifluoromethyl group (–CF3) at a putative cationic centre enhances γ-silyl neighbouring-group participation (NGP). In stark contrast to previously studied γ-silyl-substituted systems, the preferred reaction pathway is 1,3-γ-silyl elimination, giving ring closure over solvent substitution or alkene formation. The scope this cyclopropanation explored for numerous cyclic and acyclic examples, proving method be viable approach preparing CF3-substituted...
1,5,7-Triazabicyclo[4.4.0]dec-5-ene (TBD) polymerizes rac-lactide (rac-LA) to form highly isotactic polylactide (PLA) with a Pm = 0.88, while meso-LA yields heterotactic PLA (Pm ~ 0.8) at −75 °C. The stereocontrol of the cryogenic-based ring-opening polymerization comes from perfect imbrication both chiral LA and propagating end-group interacting achiral TBD catalyst.