Effect of Viscosity of Dimethacrylate Ester-Based Compositions on the Kinetics of Their Photopolymerization in Presence of o-Quinone Photoinitiators

Zakharina, M. Yu.; Fedoseev, V. B.; Chechet, Yu. V.; Чесноков, С. А.; Shaplov, Alexander S.

doi:10.1134/s1560090417060100

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…A similar observed has been previously described for multi-photon absorption by Zandrini et al [27] for different monomers and viscosities. It was shown by Zakharina et al [28] that Dimethacrylate Ester-Based Compositions at the highest viscosity chain terminations and diffusion propagation happen at lower rate. In [29] it was shown that with an increasing temperature the fabricated SZ2080 the height and diameter of the fabricated pillars also increased.…”

Section: Discussionmentioning

confidence: 98%

Shape deviations of DLW microstructures in dependency of fabrication parameters

Fritzsche

Topolniak

Weise

et al. 2021

J. Micromech. Microeng.

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Deep understanding of the effects associated with fabrication parameters and their influence on the resulting structures shape is essential for the further development of direct laser writing (DLW). In particular, it is critical for development of reference materials, where structure parameters are precisely fabricated and should be reproduced with use of DLW technology. In this study we investigated the effect of various fabrication and preparation parameters on the structural precision of interest for reference materials. A well-studied photo-curable system, SZ2080 negative photo-resist with 1 wt.% Michler’s ketone (Bis) photo-initiator, was investigated in this work. The correlation between applied laser power, laser velocity, fabrication direction on the deviations in the structure shape were observed by means of white light interferometry microscopy. Moreover, influence of slicing and hatching distances as well as prebake time were studied as function of sample shape. Deviations in the structure form between the theoretically expected and the one detected after DLW fabrication were observed in the range up to 15%. The observed shape discrepancies show the essential importance of fine-tuning the fabrication parameter for reference structure production.

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Section: Discussionmentioning

confidence: 98%

Shape deviations of DLW microstructures in dependency of fabrication parameters

Fritzsche

Topolniak

Weise

et al. 2021

J. Micromech. Microeng.

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“…The mechanism of photopolymerization initiated by o-quinones can be described using the general Scheme 2 [23,36,55,56]. Photoinitiation of radical polymerization in the presence of o-quinones is based on their photoreduction reaction [23,[32][33][34]46,47,57]. The spectral sensitivity range of these systems is determined by the position of the quinone absorption bands.…”

Section: Kinetics Studiesmentioning

confidence: 99%

“…All three listed photoinitiators are useless without the addition of co-initiators, usually tertiary amines [24,44,45]. In contrast, PQ requires no co-initiator to photoinitiate polymerization [43,46,47]. A mixture of ethylene glycol dimethacrylate (EGDMA) and 1-butanol in a 30:70 mass ratio was used for photopolymerization, leading to the formation of porous polymers; this was the approach previously used to obtain biocompatible polymers in a 36Q photoinitiating system [16].…”

Section: Introductionmentioning

confidence: 99%

Pore Structure Tuning of Poly-EGDMA Biomedical Material by Varying the O-Quinone Photoinitiator

et al. 2023

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Porous polymer monoliths with thicknesses of 2 and 4 mm were obtained via polymerization of ethylene glycol dimethacrylate (EGDMA) under the influence visible-light irradiation in the presence of a 70 wt% 1-butanol porogenic agent and o-quinone photoinitiators. The o-quinones used were: 3,5-di-tret-butyl-benzoquinone-1,2 (35Q), 3,6-di-tret-butyl-benzoquinone-1,2 (36Q), camphorquinone (CQ), and 9,10-phenanthrenequinone (PQ). Porous monoliths were also synthesized from the same mixture but using 2,2′-azo-bis(iso-butyronitrile) (AIBN) at 100 °C instead o-quinones. According to the results of scanning electron microscopy, all the resulting samples were conglomerates of spherical, polymeric particles with pores between them. Use of mercury porometry showed that the interconnected pore systems of all the polymers were open. The average pore size, Dmod, in such polymers strongly depended on both the nature of the initiator and the method of initiation of polymerization. For polymers obtained in the presence of AIBN, the Dmod value was as low as 0.8 μm. For polymers obtained via photoinitiation in the presence of 36Q, 35Q, CQ, and PQ, the Dmod values were significantly greater, i.e., 9.9, 6.4, 3.6, and 3.7 μm, respectively. The compressive strength and Young’s modulus of the porous monoliths increased symbatically in the series PQ < CQ < 36Q < 35Q < AIBN with decreasing proportions of large pores (over 12 μm) in their polymer structures. The photopolymerization rate of the EGDMA and 1-butanol, 30:70 wt% mixture was maximal for PQ and minimal for 35Q. All polymers tested were non-cytotoxic. Based on the data from MTT testing, it can be noted that the polymers obtained via photoinitiation were characterized by their positive effect on the proliferative activity of human dermal fibroblasts. This makes them promising osteoplastic materials for clinical trials.

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“…At the highest viscosities, the rate of photopolymerization is the lowest due to the diffusion-limited propagation and termination reactions. As the viscosity decreases the diffusion limitation is excluded in the propagation reaction then, as the viscosity decreases further, the diffusion limitation is excluded in the termination reaction [74]. In the work of T. Zandrini et al the influence of the viscosity to the formation of lines in 2PP was investigated (case study: viscosity influence) [75].…”

Section: Main Factors Influencing Photopolymerization Kinetics and Dementioning

confidence: 99%

Photopolymerization Mechanisms at a Spatio-temporally Ultra-confined Light

Skliutas¹,

Lebedevaite²,

Kabouraki³

et al. 2020

Preprint

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Ultrafast laser 3D lithography based on non-linear light-matter interactions, widely known as multi-photon lithography (MPL), offers unrivaled precision rapid prototyping and flexible additive manufacturing options. 3D printing equipment based on MPL are already commercially available, yet there is still no comprehensive understanding of factors determining spatial resolution, accuracy, fabrication throughput, repeatability, and standardized metrology methods for the accurate characterization of the produced 3D objects and their functionalities. The photoexcitation mechanisms, spatial-control or photo-modified volumes, and the variety of processable materials are topics actively investigated. The complexity of the research field is underlined by limited understanding and fragmented knowledge of light-excitation and material response. Research to date has only provided case-specific findings on photoexcitation, chemical modification, and material characterization of the experimental data. In this review, we aim to provide a consistent and comprehensive summary of the existing literature on photopolymerization mechanisms under highly confined spatial and temporal conditions, where, besides the excitation and cross-linking, parameters such as diffusion, temperature accumulation, and the finite amount of monomer molecules start to become of critical importance. Key parameters such as, photoexcitation, polymerization kinetics, and the properties of the additively manufactured materials at the nanoscale in 3D are examined, whereas, the perspectives for future research and as well as emerging applications are outlined.

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Effect of Viscosity of Dimethacrylate Ester-Based Compositions on the Kinetics of Their Photopolymerization in Presence of o-Quinone Photoinitiators

Cited by 9 publications

References 27 publications

Shape deviations of DLW microstructures in dependency of fabrication parameters

Shape deviations of DLW microstructures in dependency of fabrication parameters

Pore Structure Tuning of Poly-EGDMA Biomedical Material by Varying the O-Quinone Photoinitiator

Photopolymerization Mechanisms at a Spatio-temporally Ultra-confined Light

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