The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting

Wortmann M, Frese N, Keil W, Brikmann J, Biedinger J, Brockhagen B, Reiss G, Schmidt C, Gölzhäuser A, Moritzer E, Huesgen B (2020)
ACS Applied Polymer Materials 2(11): 4719-4732.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Wortmann, Martin; Frese, NatalieUniBi; Keil, Waldemar; Brikmann, Johannes; Biedinger, JanUniBi; Brockhagen, Bennet; Reiss, GünterUniBi ; Schmidt, Claudia; Gölzhäuser, ArminUniBi ; Moritzer, Elmar; Huesgen, Bruno
Abstract / Bemerkung
The industrial production of prototypes made of polyurethane via silicone molds in the vacuum casting process is one of the most widespread applications of rapid tooling. The silicone molds show progressive deterioration, as the isocyanate component of the polyurethane resin diffuses into the mold cavity surface during the casting process, thus limiting their durability. Here, we present the first comprehensive description of the underlying chemical and physical mechanisms on a molecular level. It is shown that the isocyanate polymerizes inside the polydimethylsiloxane matrix with moisture to polyurea. Polyurea clusters, which emerge from the resulting interpenetrating polymer network with continuing isocyanate exposure, promote fissure formation under mechanical demolding stresses. The mechanism was investigated with a wide variety of characterization methods, and qualitative variations were demonstrated using different commercial materials. Influencing factors such as mold geometry, process flow, and different aspects of the material composition were examined experimentally. A thorough understanding of the deterioration mechanism paves the way for the development of durable molds and an economical midseries technology in plastics processing.
Stichworte
vacuum casting; polyurethane casting; silicone mold; interpenetrating; polymer network; rapid tooling
Erscheinungsjahr
2020
Zeitschriftentitel
ACS Applied Polymer Materials
Band
2
Ausgabe
11
Seite(n)
4719-4732
eISSN
2637-6105
Page URI
https://pub.uni-bielefeld.de/record/2950237

Zitieren

Wortmann M, Frese N, Keil W, et al. The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting. ACS Applied Polymer Materials . 2020;2(11):4719-4732.
Wortmann, M., Frese, N., Keil, W., Brikmann, J., Biedinger, J., Brockhagen, B., Reiss, G., et al. (2020). The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting. ACS Applied Polymer Materials , 2(11), 4719-4732. doi:10.1021/acsapm.0c00744
Wortmann, M., Frese, N., Keil, W., Brikmann, J., Biedinger, J., Brockhagen, B., Reiss, G., Schmidt, C., Gölzhäuser, A., Moritzer, E., et al. (2020). The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting. ACS Applied Polymer Materials 2, 4719-4732.
Wortmann, M., et al., 2020. The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting. ACS Applied Polymer Materials , 2(11), p 4719-4732.
M. Wortmann, et al., “The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting”, ACS Applied Polymer Materials , vol. 2, 2020, pp. 4719-4732.
Wortmann, M., Frese, N., Keil, W., Brikmann, J., Biedinger, J., Brockhagen, B., Reiss, G., Schmidt, C., Gölzhäuser, A., Moritzer, E., Huesgen, B.: The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting. ACS Applied Polymer Materials . 2, 4719-4732 (2020).
Wortmann, Martin, Frese, Natalie, Keil, Waldemar, Brikmann, Johannes, Biedinger, Jan, Brockhagen, Bennet, Reiss, Günter, Schmidt, Claudia, Gölzhäuser, Armin, Moritzer, Elmar, and Huesgen, Bruno. “The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting”. ACS Applied Polymer Materials 2.11 (2020): 4719-4732.

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