Aging of UV curable PDMS developed for large-scale, high viscosity stereolithography

Song, Hongtao; Rodriguez, Nicholas A.; Oakdale, James S.; Duoss, Eric B.; Crawford, Richard H.; Seepersad, Carolyn C.

doi:10.1016/j.polymdegradstab.2022.110227

Aging of UV curable PDMS developed for large-scale, high viscosity stereolithography

Journal Article · Thu Dec 08 23:00:00 EST 2022 · Polymer Degradation and Stability

DOI:https://doi.org/10.1016/j.polymdegradstab.2022.110227· OSTI ID:1962979

Song, Hongtao ^[1]; Rodriguez, Nicholas A. ^[2]; Oakdale, James S. ^[3]; Duoss, Eric B. ^[3]; Crawford, Richard H. ^[1]; ^[1]

University of Texas, Austin, TX (United States)
University of Texas, Austin, TX (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Polydimethylsiloxane (PDMS) elastomers are silicone rubbers that find widespread application in both academic and industrial settings. This study investigates the use of photosensitive platinum catalysts for UV-activated hydrosilylation of PDMS, which enables the additive manufacturing of PDMS objects through techniques such as stereolithography. Specifically, this study focuses on understanding the aging behavior of Pt-catalyzed, UV-curable PDMS samples, including their mechanical behavior under thermal and UV-accelerated aging conditions. The results show that the Pt-catalyzed, UV-curable PDMS introduced in this research is ‘under-cured’ after being printed and will slowly evolve over time resulting in increased stiffness and decreased elongation, likely due to the formation of additional crosslinks. FTIR spectroscopy indicates that no new chemical bonds or functional groups are generated through the aging process, suggesting that no thermal degradation or polymer chain scissions occur in the polymer matrix. Overall, this PDMS formulation exhibits greater mechanical strength and significantly less reduction in strength with aging, compared with the commonly used, UV-curable thiol-ene PDMS.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1962979

Alternate ID(s):: OSTI ID: 1961884

Report Number(s):: LLNL-JRNL-840405; 1061924

Journal Information:: Polymer Degradation and Stability, Journal Name: Polymer Degradation and Stability Journal Issue: N/A Vol. 207; ISSN 0141-3910

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
42 ENGINEERING
additive manufacturing
aging research
hydrosilylation
polydimethylsiloxane
stereolithography

Aging of UV curable PDMS developed for large-scale, high viscosity stereolithography

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