| AVS 66th International Symposium & Exhibition | |
| Applied Surface Science Division | Tuesday Sessions |
| Session AS+BI+RA-TuM |
| Session: | Quantitative Surface Analysis III/Other Surface Analysis Methods |
| Presenter: | Martin Wortmann, Bielefeld University of Applied Sciences, Germany |
| Authors: | M. Wortmann, Bielefeld University of Applied Sciences, Germany R. Petkau, Bielefeld University of Applied Sciences, Germany N. Frese, Bielefeld University, Germany E. Moritzer, Paderborn University, Germany A. Gölzhäuser, Bielefeld University, Germany B. Hüsgen, Bielefeld University of Applied Sciences, Germany |
| Correspondent: | Click to Email |
The vacuum casting process is used industrially to replicate prototypes of polyurethane (PUR). Due to the diffusion of 4,4′‐methylene diphenyl diisocyanate (MDI), a PUR resin component, the silicone casting molds used in this process show a progressive degradation, which leads to the failure of the casting molds after a few casting cycles [1]. In this contribution, we present ways to protect the surface of the silicone elastomer by various thermoplastic polymer coatings. The polymers investigated were dissolved in different volatile solvents and coated on pretreated silicone surfaces. For this purpose, the compatibility of those polymer solutions with polydimethylsiloxane (PDMS) was investigated and their diffusion coefficients with respect to MDI were measured. Polymer coatings that have exhibited a high diffusion barrier have been used to drastically increase the output of the casting molds.
[1] M. Wortmann et al., Polymer Plast Tech Eng 57, 1524 (2018).