Photo-curing of thick monomer systems with photoluminescent ZnO nanoparticles photoinitiators

Mo, Yuan; Ye, Daiyong

doi:10.1016/j.porgcoat.2022.106788

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…In this process, the photoinitiator XBPO is cleaved under 395 nm UV exposure to generate benzoyl and phosphonyl radicals. [ 27 ] Our researches reveal that a small amount of free radicals initiate the polymerization of photoresist, while the majority of free radicals reduce GO, ultimately leading to the formation of PRGO composites. Throughout the whole process, photopolymerization and photoreduction are a pair of competing reactions.…”

Section: Resultsmentioning

confidence: 99%

Conductive Micropatterns Containing Photoinduced In Situ Reduced Graphene Oxide Prepared by Ultraviolet Photolithography

Mei

Wang

et al. 2023

Adv Materials Technologies

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metal nanowires into polymers to improve their conductivity. [3] Among these, graphene has attracted much attention for its high conductivity. [4] Nevertheless, the traditional synthesis methods of graphene are limited by their complexity and low yields. [5] Owing to the strong π-π interaction between graphene layers, the interfacial dispersion between graphene and the polymer is poor, which leads to the easy aggregation of graphene in the polymer. [6] These defects inevitably affect the performance of graphene-based polymers and constrain their extensive applications.Currently, the common strategy adopted by researchers is to replace graphene with GO for combination with polymers. [7] First, GO can be produced on a large scale. Second, GO contains rich oxygencontaining functional groups. Through covalent grafting functionalization with various organic functional groups, GO easily disperses in organic solvents and polymer matrices. [8] Oxygen-containing functional groups, which destroy the path of electron movement, however, result in the conductivity of GO being far lower than that of graphene, which seriously restricts its application. To improve its conductivity, it is essential to find a suitable method to reduce GO. [9] Currently, the common reduction methods for GO are chemical reduction [10] and thermal reduction. [11] While they both take a long time for reduction, reducing agents used in chemical reduction such as hydrazine hydrate are toxic and harmful. Alternatively, photoreduction is a means of reducing GO by irradiation, which has the merits of a mild reduction process, environmental friendliness and short period compared to conventional methods. [12] According to the sequence of reduction, the preparation approaches of RGO/polymers can be divided into ex situ polymerization and in situ poly merization. [13] The former refers to reduction prior to the preparation of the composites, and the latter involves simultaneous reduction during the preparation process. As a result, composites obtained by in situ polymerization have better dispersion and material properties. Xue [14] utilized bis(2,4,6-trimethylbenzoyl) phenylphosphine oxide (XBPO) to reduce GO by UV irradiation and then mixed RGO with SU-8 photoresist to obtain conductive RGO/SU-8 films. His work is ex situ reduction, which means increasing the complexity of the preparation process. Chiappone [15] et al. used 2-hydroxy-2-methyl-1-phenyl-1-acetone (HMPP) as a Herein, one kind of conductive patterned film with high resolution comprised of reduced graphene oxide (RGO) is prepared by the ultraviolet photo lithography technique. RGO working as a conductive filler greatly improves the conductivity of films and is formed through the photoinduced in situ reduction of graphene oxide (GO) added to the photoresist of the patterned films. This photoreduction method is very ecofriendly and efficient with a reduction time of <20 min. Furthermore, the effect of various factors on the conductivity of the films is investigated in detail, and appropriate c...

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Section: Resultsmentioning

confidence: 99%

Conductive Micropatterns Containing Photoinduced In Situ Reduced Graphene Oxide Prepared by Ultraviolet Photolithography

Mei

Wang

et al. 2023

Adv Materials Technologies

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“…However, compared with organic photosensitizers, inorganic nanomaterials exhibit many outstanding advantages in acting as photosensitizers 12,13 due to their excellent mechanical, electrical and optical properties. Not only can overcome the disadvantages of oxygen inhibition, residual volatile photolysis fragments and coating migration in the polymerization, but they can also combine with the versatility of photoinitiation and filler effect, thereby improving the overall properties of the polymer.…”

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confidence: 99%

Preparation of functionalZnOnanoparticles and their application asUVphotosensitizer and reinforcing agent for waterborne polyurethane acrylate composite coating

Shen

Liu

et al. 2022

J of Applied Polymer Sci

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Functional inorganic ZnO nanoparticles (ZnO NPs) have been designed and prepared, used as UV photosensitizers and reinforcing agents applied to waterborne polyurethane acrylate (WPUA) composite coating. The ZnO NPs are modified by the silane coupling agent, and the WPUA@ZnO NP composite coatings photoinitiated with different ZnO NP contents are prepared, their structure and properties are characterized by FTIR, XRD, SEM, BET, TG, and pencil hardness tester. The UV absorption of the inorganic photosensitizer ZnO NPs and the organic photosensitizer 1-hydroxycyclohexyl phenone (184) in the composite coating is tested and analyzed separately by DRS UV-3600 spectrophotometer. Three fabric-based materials (cotton, PET, and PP) are dipped into the WPUA@184 composite emulsions and WPUA@ZnO NP composite emulsions, and their mechanical properties, water absorption and water contact angle (WCA) are tested. The results show that the absorbance of the WPUA@ZnO NP composite coating is 40.28% higher than that of the WPUA@184 composite coating. Compared with the PP-WPUA@184 coatings, the stress of the PP-WPUA@ZnO NP coatings increases by 41.19% and the strain increases by 34.39%. The water absorption of the cotton and PET coatings decreases under the three conditions. Their hydrophilicity and hydrophobicity are changed, and the fabric-based coatings can be tuned for interfacial properties.

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Thermal/photothermal-induced flexible folding and rapid soft-to-rigid transition in dark fiber composite structural components

Sun,

Zhang,

et al. 2024

Composites Communications

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Photo-curing of thick monomer systems with photoluminescent ZnO nanoparticles photoinitiators

Cited by 4 publications

References 41 publications

Conductive Micropatterns Containing Photoinduced In Situ Reduced Graphene Oxide Prepared by Ultraviolet Photolithography

Conductive Micropatterns Containing Photoinduced In Situ Reduced Graphene Oxide Prepared by Ultraviolet Photolithography

Preparation of functionalZnOnanoparticles and their application asUVphotosensitizer and reinforcing agent for waterborne polyurethane acrylate composite coating

Thermal/photothermal-induced flexible folding and rapid soft-to-rigid transition in dark fiber composite structural components

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