ORCID Profile
0000-0003-3603-3464
Current Organisation
Queensland University of Technology
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Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA11350D
Abstract: D–π–A type photoacid generators with a benzene-oligomer as π-conjugated systems show high photoacid generation efficiency ( Φ H+max 0.7) and good photoinitiated polymerization abilities by 365 nm and 780 nm excitation.
Publisher: Wiley
Date: 17-05-2016
DOI: 10.1002/POLA.28154
Publisher: Springer Science and Business Media LLC
Date: 22-10-2016
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 09-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3SC04052F
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 22-09-2020
Publisher: Elsevier BV
Date: 11-2021
Publisher: Wiley
Date: 13-08-2021
Abstract: In order to respond to the growing demand for radiation‐curable waterborne products like hydrogels or inks, there is a need for water‐soluble radical photoinitiators exhibiting absorption in the near UV to visible range. Herein the synthesis of a novel type‐I diphenylphosphine oxide photoinitiator bearing a 2,6‐dimethyl‐4‐dimethylaminobenzoyl group is described. The presence of a tertiary amino group in the para position of the benzoyl group results in an increased absorption in the visible range and its facile conversion into water‐soluble derivatives after a subsequent protonation or quaternization reaction. Quaternization with methyl triflate (MeOTf) yields a water‐soluble monoacylphosphine oxide compound displaying a quaternary ammonium group N(CH 3 ) 3 + OTf − . The main characteristics are water‐solubility, shelf‐stability, absorption in near‐UV range, low cytotoxicity, and efficient α ‐scission as evidenced by steady‐state photolysis experiments. Its photopolymerization efficiency has been evaluated by real‐time Fourier transform infrared spectroscopy at 385 and 420 nm using an aqueous solution of poly(ethylene glycol) acrylate. The polymerization rate is comparable to that obtained with the conventional water‐soluble monoacylphosphine oxide TPO‐Li. Using this new photoinitiator, 3D‐printed hydrogels, and aqueous polymer dispersions can be prepared.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1PY01728D
Abstract: A fluorescent molecular rotor is exploited as a viscosity probe to reveal heterogeneity in multi-material microstructures made by two-photon polymerization. These results open the door to probe the 4D character of active 3D microstructures.
Publisher: Wiley
Date: 12-01-2023
Abstract: Photoactivated Reversible Deactivation Radical Polymerization (RDRP) technologies have emerged very recently in the field of 3D printing systems especially at the macroscale in vat‐photopolymerization‐based processes such as digital light processing (DLP). Contrary to conventional free radical photopolymerization, photoRDRP in 3D printing leads to 3D objects with living character and thus confers them the unique ability to be post‐modified after fabrication. While 3D direct laser writing (3D DLW) by two photon polymerization has become a standard for fabrication of complex 3D micro‐objects, the use of RDRP and its associated benefits has so far been under‐investigated at that scale. Herein, a photoresist suitable for 3D DLW based on nitroxide mediated photopolymerization (NMP2) is developed. The photopolymerization efficiency for fabrication of micro‐structures and their subsequent post‐modification are investigated regarding the laser power and the wavelength of excitation. Moreover, highly tunable, precise, and successive surface patterning of 2D and 3D multi‐material microstructures are demonstrated thanks to the spatial and temporal control offered by the photo‐induced post‐modification. This work highlights new directions to be explored in order to accelerate the adoption of RDRP in 3D printing based on photopolymerization.
Publisher: Wiley
Date: 08-10-2017
DOI: 10.1002/POLA.28871
Publisher: The Royal Society of Chemistry
Date: 16-08-2018
Publisher: Wiley
Date: 13-10-2017
Abstract: A series of donor-π-acceptor-type sulfonium salt photoacid generators (PAGs) were designed and synthesized by systematically changing electron-donating groups, π-conjugated systems, electron-withdrawing groups, and the number of branches through molecular engineering. These PAGs can effectively decompose under UV/Vis irradiation from a light-emitting diode (LED) light source because of the matching absorption and emitting spectra of the LEDs. The absorption and acid-generation properties of these sulfonium salts were elucidated by UV/Vis spectroscopy and so forth. Results indicated that the PAG performance benefited from the introduction of strong electron-donating groups, specific π-conjugated structures, certain electron-withdrawing groups, or two-branched structures. Most sulfonium salts showed potential as photoinitiators under irradiation by a wide variety of UV and visible LEDs.
Publisher: Wiley
Date: 08-01-2018
DOI: 10.1002/POLA.28951
No related grants have been discovered for Xingyu WU.