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Open AccessArticle

Reliable Condensation Curing Silicone Elastomers with Tailorable Properties

1
DPC, Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), Building 227, 2800 Kgs. Lyngby, Denmark
2
Hempel A/S, Lundtoftegårdsvej 91, 2800 Kgs. Lyngby, Denmark
3
CoaST, Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), Building 229, 2800 Kgs. Lyngby, Denmark
4
Chemistry and Chemical Biology, McMaster University, 1280 Main St. W, Hamilton, ON L8S 4M1, Canada
*
Author to whom correspondence should be addressed.
Molecules 2021, 26(1), 82; https://doi.org/10.3390/molecules26010082
Received: 5 December 2020 / Revised: 22 December 2020 / Accepted: 23 December 2020 / Published: 27 December 2020
The long-term stability of condensation curing silicone elastomers can be affected by many factors such as curing environment, cross-linker type and concentration, and catalyst concentration. Mechanically unstable silicone elastomers may lead to undesirable application failure or reduced lifetime. This study investigates the stability of different condensation curing silicone elastomer compositions. Elastomers are prepared via the reaction of telechelic silanol-terminated polydimethylsiloxane (HO-PDMS-OH) with trimethoxysilane-terminated polysiloxane ((MeO)3Si-PDMS-Si(OMe)3) and ethoxy-terminated octakis(dimethylsiloxy)-T8-silsesquioxane ((QMOEt)8), respectively. Two post-curing reactions are found to significantly affect both the stability of mechanical properties over time and final properties of the resulting elastomers: Namely, the condensation of dangling and/or unreacted polymer chains, and the reaction between cross-linker molecules. Findings from the stability study are then used to prepare reliable silicone elastomer coatings. Coating properties are tailored by varying the cross-linker molecular weight, type, and concentration. Finally, it is shown that, by proper choice of all three parameters, a coating with excellent scratch resistance and electrical breakdown strength can be produced even without an addition of fillers. View Full-Text
Keywords: silicone elastomers; stability; network structure; condensation curing; reinforcing cross-linker domains; coatings silicone elastomers; stability; network structure; condensation curing; reinforcing cross-linker domains; coatings
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MDPI and ACS Style

Jurásková, A.; Møller Olsen, S.; Dam-Johansen, K.; Brook, M.A.; Skov, A.L. Reliable Condensation Curing Silicone Elastomers with Tailorable Properties. Molecules 2021, 26, 82. https://doi.org/10.3390/molecules26010082

AMA Style

Jurásková A, Møller Olsen S, Dam-Johansen K, Brook MA, Skov AL. Reliable Condensation Curing Silicone Elastomers with Tailorable Properties. Molecules. 2021; 26(1):82. https://doi.org/10.3390/molecules26010082

Chicago/Turabian Style

Jurásková, Alena; Møller Olsen, Stefan; Dam-Johansen, Kim; Brook, Michael A.; Skov, Anne L. 2021. "Reliable Condensation Curing Silicone Elastomers with Tailorable Properties" Molecules 26, no. 1: 82. https://doi.org/10.3390/molecules26010082

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