TY - JOUR
T1 - PDMS Curing Inhibition on 3D-Printed Molds
T2 - Why? Also, How to Avoid It?
AU - Venzac, Bastien
AU - Deng, Shanliang
AU - Mahmoud, Ziad
AU - Lenferink, Aufried
AU - Costa, Aurélie
AU - Bray, Fabrice
AU - Otto, Cees
AU - Rolando, Christian
AU - Le Gac, Séverine
N1 - Funding Information:
The authors thank Prof. Nathalie Azaroual and Alexandre Rech from the GRITA laboratory for recording NMR spectra. The NMR and Mass Spectrometry facilities are funded by the European Regional Development Fund, Région Haut-de-France (France), the CNRS, and the University of Lille. Access to the FT-ICR MS in the frame of the EU_FT-ICR_MS network installation is funded by the EU Horizon 2020 grant 731077; support for conducting research is gratefully acknowledged.
Publisher Copyright:
©
PY - 2021/5/18
Y1 - 2021/5/18
N2 - Three-dimensional (3D)-printing techniques such as stereolithography (SLA) are currently gaining momentum for the production of miniaturized analytical devices and molds for soft lithography. However, most commercially available SLA resins inhibit polydimethylsiloxane (PDMS) curing, impeding reliable replication of the 3D-printed structures in this elastomeric material. Here, we report a systematic study, using 16 commercial resins, to identify a fast and straightforward treatment of 3D-printed structures and to support accurate PDMS replication using UV and/or thermal post-curing. In-depth analysis using Raman spectroscopy, nuclear magnetic resonance, and high-resolution mass spectrometry revealed that phosphine oxide-based photo-initiators, leaching out of the 3D-printed structures, are poisoning the Pt-based PDMS catalyst. Yet, upon UV and/or thermal treatments, photo-initiators were both eliminated and recombined into high molecular weight species that were sequestered in the molds.
AB - Three-dimensional (3D)-printing techniques such as stereolithography (SLA) are currently gaining momentum for the production of miniaturized analytical devices and molds for soft lithography. However, most commercially available SLA resins inhibit polydimethylsiloxane (PDMS) curing, impeding reliable replication of the 3D-printed structures in this elastomeric material. Here, we report a systematic study, using 16 commercial resins, to identify a fast and straightforward treatment of 3D-printed structures and to support accurate PDMS replication using UV and/or thermal post-curing. In-depth analysis using Raman spectroscopy, nuclear magnetic resonance, and high-resolution mass spectrometry revealed that phosphine oxide-based photo-initiators, leaching out of the 3D-printed structures, are poisoning the Pt-based PDMS catalyst. Yet, upon UV and/or thermal treatments, photo-initiators were both eliminated and recombined into high molecular weight species that were sequestered in the molds.
KW - UT-Hybrid-D
UR - http://www.scopus.com/inward/record.url?scp=85106365279&partnerID=8YFLogxK
U2 - 10.1021/acs.analchem.0c04944
DO - 10.1021/acs.analchem.0c04944
M3 - Article
AN - SCOPUS:85106365279
SN - 0003-2700
VL - 93
SP - 7180
EP - 7187
JO - Analytical chemistry
JF - Analytical chemistry
IS - 19
ER -
