期刊
POLYMER-PLASTICS TECHNOLOGY AND ENGINEERING
卷 57, 期 15, 页码 1524-1529出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/03602559.2017.1410838
关键词
Aging; diffusion; polyurea; polyurethane; silicone; vacuum casting
资金
- Federal Ministry for Economic Affairs and Energy [ZF4036101RU5]
We present an in-depth investigation of the aging effects in silicone molds for vacuum casting processes. Their lifetime is limited to a few production cycles due to contamination with the diisocyanate component of polyurethane casting materials. Using thermogravimetric analysis measurements, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and helium-ion-microscopy the chemical and physical mechanisms of the aging process have been identified. It has been shown that a diffusion process of diisocyanate into the cavity surface leads to the formation of interpenetrating polymer networks of polyurea derivatives in silicone rubber. This has been proven by extracting and analyzing polyurea of low molecular weights from the silicone. [GRAPHICS] .
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