Publicaties
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One-pot, additive-free preparation of functionalized polyurethanes via amine-thiol-ene conjugation Universiteit Gent
A straightforward, isocyanate-free method for the synthesis of functionalized polyurethanes, based on amine-thiol-ene conjugation, was elaborated. Aminolysis of a readily available AB'-urethane monomer, containing both an acrylate (A) and a thiolactone unit (B'), facilitates the preparation of various reactive thiol-acrylates. In situ polymerization via Michael addition proceeds under ambient conditions, yielding polyurethanes with a large ...
Isocyanate free condensed tannin-based polyurethanes Vrije Universiteit Brussel
Condensed flavonoid tannins from Maritime Pine (Pious pinaster), Mimosa (Acacia mearnsii), and Radiata Pine barks, and Quebracho (Schinopsis lorentzii and balansae) wood, were first reacted with dimethyl carbonate. Then hexamethylenediamine was added to these mixtures to form urethane linkages. The resulting materials were analyzed by Fourier transform infrared (FTIR) spectroscopy, matrix assisted laser desorption ionization time of flight ...
3D printing of high drug loaded dosage forms using thermoplastic polyurethanes Universiteit Gent
It was the aim of this study to develop high drug loaded (> 30%, w/w), thermoplastic polyurethane (TPU)-based dosage forms via fused deposition modelling (FDM). Model drugs with different particle size and aqueous solubility were pre-processed in combination with diverse TPU grades via hot melt extrusion (HME) into filaments with a diameter of 1.75 +/- 0.05 mm. Subsequently, TPU-based filaments which featured acceptable quality attributes ...
Hydrophilic thermoplastic polyurethanes for the manufacturing of highly dosed oral sustained release matrices via hot melt extrusion and injection molding Universiteit Gent
Functionalization of polyurethanes by incorporation of alkyne side-groups to oligodiols and subsequent thiol-yne post-modification Universiteit Gent
Multi-block polyurethanes via RAFT end-group switching and their characterization by advanced hyphenated techniques Universiteit Gent
The detailed characterization of poly(styrene)-b-poly(tetrahydrofuran) (pS-b-pTHF) multiblock copolymers (17800 g mol(-1) <= M-n <= 46800 g mol(-1)) generated via urethane linkages is presented. The synthesis of the block copolymers is enabled via a mechanistic switch of the thiocarbonyl thio end group of a poly(styrene) to dihydroxyl terminated polymers that subsequently react with a diisocyanate terminated polytetrahydrofuran based ...
Reducing the carbon footprint of polyurethanes by chemical and biological depolymerization : fact or fiction? Universiteit Gent
Polyurethanes (PUs) are one of the most widely employed classes of polymers, with a continuously increasing production demand that is expected to reach around 21 million tons in 2022. Due to the simple polymerization process by which they are produced, the versatility in PU chemistry, and the strong inter/intramolecular interactions present between urethane moieties, these robust materials can be used in diverse applications ranging from ...
Fast pyrolysis of polyurethanes and polyisocyanurate with and without flame retardant : compounds of interest for chemical recycling Universiteit Gent
To date, the recycling of polyurethane (PU) and polyisocyanurate (PIR) waste still poses a significant problem. Within this contribution, the thermal degradation of high-resilient ether PU, semirigid PU, rigid PU, and (PIR) with and without TCPP flame retardant was studied at different temperatures to identify and quantify the main products. For this, a tandem micropyrolyzer coupled to GC x GC with FID and ToF-MS detectors was used, and the ...