Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting.

Wortmann M, Krieger P, Frese N, Moritzer E, Husgen B (2021)
ACS omega 6(7): 4687–4695.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Wortmann, Martin; Krieger, Philipp; Frese, NatalieUniBi; Moritzer, Elmar; Husgen, Bruno
Abstract / Bemerkung
Polyurethane vacuum casting with silicone molds is a widely used industrial process for the production of prototypes and small batches. Since the silicone casting molds absorb the isocyanate component of the curing PUR casting resin at the cavity surface, the service life of the molds is typically restricted to very few casting cycles. The successive deterioration of the material properties results from the polymerization of the absorbed isocyanate with moisture to polyurea derivatives within the silicone matrix. In this study, we show for the first time the influence of isocyanate absorption on the mechanical properties of silicone elastomers as well as quantitative differences between commercial materials. The changes in mechanical properties were quantified in terms of Shore A hardness, Young's modulus, tensile strength, elongation at break, and complex shear modulus. It was found that the influence of the isocyanate type on the relative property changes of the silicone was significantly greater than that of the silicone used. The results show that, regardless of its hardness, the silicone absorbs considerably less methylene diphenyl diisocyanate (MDI) than hydrogenated MDI, although the latter causes less deterioration of the mechanical properties and achieves a longer mold service life. © 2021 The Authors. Published by American Chemical Society.
Erscheinungsjahr
2021
Zeitschriftentitel
ACS omega
Band
6
Ausgabe
7
Seite(n)
4687–4695
eISSN
2470-1343
Page URI
https://pub.uni-bielefeld.de/record/2952474

Zitieren

Wortmann M, Krieger P, Frese N, Moritzer E, Husgen B. Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting. ACS omega. 2021;6(7):4687–4695.
Wortmann, M., Krieger, P., Frese, N., Moritzer, E., & Husgen, B. (2021). Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting. ACS omega, 6(7), 4687–4695. https://doi.org/10.1021/acsomega.0c05436
Wortmann, M., Krieger, P., Frese, N., Moritzer, E., and Husgen, B. (2021). Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting. ACS omega 6, 4687–4695.
Wortmann, M., et al., 2021. Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting. ACS omega, 6(7), p 4687–4695.
M. Wortmann, et al., “Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting.”, ACS omega, vol. 6, 2021, pp. 4687–4695.
Wortmann, M., Krieger, P., Frese, N., Moritzer, E., Husgen, B.: Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting. ACS omega. 6, 4687–4695 (2021).
Wortmann, Martin, Krieger, Philipp, Frese, Natalie, Moritzer, Elmar, and Husgen, Bruno. “Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting.”. ACS omega 6.7 (2021): 4687–4695.

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