3-wavelength (UV, blue, red) controlled photo-confinement for 3D-printing: kinetics and modeling

Detailed kinetics for a 3-wavelength photopolymerization confinement (PC) system is presented for both numerical solutions and analytic formulas. The dynamic profiles of oxygen, free radicals, and monomer conversion for various situations of: blue-light only, 2-light (red and UV), and 3-light (red,...

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Bibliographic Details
Published in:IEEE access 2020-01, Vol.8, p.1-1
Main Authors: Lin, Jui-Teng, Cheng, Da-Chuan, Chen, Kuo-Ti, Chiu, Yin-Chen, Liu, Hsia-Wei
Format: Article
Language:English
Subjects:
3D printing
additive manufacturing
Confinement
Conversion
Free radicals
Inhibitors
Irradiation
Kinetic model
Kinetic theory
Kinetics
Light
Photopolymerization
Polymers
Radiation effects
Resins
Three dimensional models
Three dimensional printing
Ultraviolet radiation
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Summary:Detailed kinetics for a 3-wavelength photopolymerization confinement (PC) system is presented for both numerical solutions and analytic formulas. The dynamic profiles of oxygen, free radicals, and monomer conversion for various situations of: blue-light only, 2-light (red and UV), and 3-light (red, blue, UV) are obtained. Higher oxygen concentration leads to a lower conversion, which could be enhanced by reducing the S-inhibition via a red or blue light pre-irradiation. We found that pre-irradiation time is given by TP = 200 s for red-light only, and reduced to 150 s, for both red and blue-light. The system under UV-only leads to a conversion lower than that of blue-only. However, conversion could be improved by the dual-light (blue and UV), and further enhanced by the pre-irradiation of red-light. The two competing factors, N-inhibition and S-inhibition, could be independently and selectively tailored to achieve: (i) high conversion of blue-light (without UV-light), enhanced by red-light pre-irradiation for minimal S-inhibition; and (ii) efficient PC initiated by UV-light produced N-inhibition for reduced confinement thickness and for high print speed.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2979172