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WEB Investigation and Prevention of the Aging Mechanism of Silicone Molds for Vacuum Casting

Thursday (27.02.2020)
14:24 - 14:24 Poster Room
Part of:
- Poster *web*Investigating the origin of magnetic uniaxial anisotropy in cobalt ferrite induced by Spark Plasma Sintering 1 Dr.-Ing. Alex Aubert
- Poster *web*Anomalous Bulk Diffusion Mechanism of Methylen Diphenylmethane-4,4′-diisocyanate in Cross-linked Poly(dimethylsiloxane) 1 Dipl.-Ing. Martin Wortmann
- Poster *web*Investigation and Prevention of the Aging Mechanism of Silicone Molds for Vacuum Casting 1 Jan Biedinger
- Poster *web*Microstructural and chemical characteristics of flame sprayed (Bi0.5Na0.5)TiO3 coatings using different fuel/oxygen ratio 1 Ph.D. Aixa-Ibeth Gutiérrez-Pérez
- Poster *web*Accelerated Mn-Al τ-phase formation induced by electric current assisted annealing 1 Ph.D. Fernando Maccari
- Poster *web*Dry field-assisted ion exchange of silver in amorphous and crystalline systems 1 Dr. Mattia Biesuz
- Poster *web*In-Situ Electron Microscopy Studies of Flash Annealing in Oxide Ceramics 1 Danny Schwarzbach
- Poster *web*On the influence of processing parameters for the fabrication of FeNi36 alloy by Laser Powder Bed Fusion 1 Prof. Dr.-Ing. Fernando Lasagni
- Poster *web*Densification of yttria by flash sintering under an AC electric field 1 Kohta Nambu
- Poster *web*Milling parameters, microstructure evaluation and thermodynamic simulations for oxide dispersed strengthening (ODS) nano-particles for Ni and Fe high-temperature alloy powders for additive manufacturing 1 Sara Catalina Pineda Heresi
- Poster *web*Aging of carbon materials for Aluminium electrolysis at alternating temperatures 1 Henry Pusch

Session -P: Processing and Synthesis
Belongs to:
Topic X: Poster Session

Silicone casting molds are mainly used in the vacuum casting process for the production of prototypes made of polyurethane. However, due to lifetime limitation of these casting molds to few production cycles, this production process is rarely considered for an extensive use in small batch production [1]. In the presented work, the chemical and physical mechanisms of the aging effects in silicone molds have been studied by using a wide variety of characterization methods. It has been shown that an anomalous diffusion process of the diisocyanate component of the polyurethane casting resin into the silicone surface leads to the formation of interpenetrating polymer networks of polyurea derivatives in the poly(dimethylsiloxane) matrix [2]. This has been proven by extracting and analyzing polyurea of low molecular weights from the silicone. The development of an appropriate barrier layer system for the protection of silicone molds from the diisocyanate would result in an improved economic efficiency for the applied production processes in industry. With this, the gap in plastic processing between very small (rapid prototyping) and very large quantities (injection molding) might be closed. Therefore, we have grown several combinations of thin films onto plane silicone samples, including carbon nanomembranes [3] prepared via spin-coating and silicon dioxide deposited by reactive radio-frequency magnetron sputtering. Subsequently, the samples were characterized in terms of the films’ individual growth and their ability to prevent the aging mechanisms in silicone.

[1] O. Strube et al., Polym.-Plast. Technol. 54, 494 (2015)

[2] M. Wortmann et al., Polym.-Plast. Technol. 57, 1524 (2017)

[3] A. Turchanin and A. Gölzhäuser, Adv. Mater. 28, 6075 (2016)

Jan Biedinger
Bielefeld University
Additional Authors:
  • Dr. Natalie Frese
    Bielefeld University
  • Alexander Heide
    Bielefeld University of Applied Sciences
  • Martin Wortmann
    Bielefeld University of Applied Sciences
  • Prof. Dr. Bruno Hüsgen
    Bielefeld University of Applied Sciences
  • Prof. Dr. Armin Gölzhäuser
    Bielefeld University
  • Prof. Dr. Günter Reiss
    Bielefeld University