Issue 68, 2019
From the journal:

RSC Advances

A new safranin based three-component photoinitiating system for high resolution and low shrinkage printed parts via digital light processing†

Atefeh Nejadebrahim,a   Morteza Ebrahimi, ORCID logo *a   Xavier Allonas, ORCID logo *b   Céline Croutxé-Barghorn, ORCID logo b   Christian Leyb  and  Boris Métralb  

* Corresponding authors

a Polymer and Color Engineering Dept., Amirkabir University of Technology, 424 Hafez Ave., Tehran, Iran
E-mail: ebrahimi@aut.ac.ir

b Laboratory of Molecular Photochemistry and Engineering, University of Haute Alsace, 3b Rue Alfred Werner, 68093 Mulhouse, France

Abstract

Additive manufacturing or 3D printing has attracted the interest of researchers in industry and academia because of its outstanding features. In this study, a new three-component photoinitiating system (PIS) consisting of safranin O (SFH+), thiol derivatives and diphenyl iodonium salt was used for the free radical photopolymerization of a diacrylate monomer (SR349) in DLP 3D printing. The photoinitiating characteristics of this PIS were evaluated and advantageously compared to those of a conventional PI (TPO) by using RT-FTIR. It is shown that the proposed PIS could be used as an efficient PIS for free radical photopolymerization. In addition, the resolution and shrinkage of printed parts in the presence of this three-component PIS were measured and compared to those printed using TPO as a photoinitiator. The resolution of printed parts was determined by using SEM and profilometry techniques. In addition, photorheometry was used to evaluate the linear shrinkage of samples. Moreover, the initiating mechanism of the three-component PIS was studied by using laser flash photolysis (LFP). A photocyclic mechanism was outlined for the three-component PIS which demonstrated this mechanism would be very beneficial for DLP 3D printing.

Graphical abstract: A new safranin based three-component photoinitiating system for high resolution and low shrinkage printed parts via digital light processing

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Article information

DOI
https://doi.org/10.1039/C9RA09170J
Article type
Paper
Submitted
21 Sep 2019
Accepted
26 Nov 2019
First published
09 Dec 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 39709-39720

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A new safranin based three-component photoinitiating system for high resolution and low shrinkage printed parts via digital light processing

A. Nejadebrahim, M. Ebrahimi, X. Allonas, C. Croutxé-Barghorn, C. Ley and B. Métral, RSC Adv., 2019, 9, 39709 DOI: 10.1039/C9RA09170J

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