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Novel polyfunctional silanes for improved hydrolytic stability at the polymer-silica interface
N Nishiyama1, T Ishizaki, K Horie
1Department of Dental Materials, Nihon University School of Dentistry, Chiba, Japan.
Journal of Biomedical Materials Research
|February 1, 1991
Summary
Polyfunctional silanes enhance silica surface stability for resin adhesion. Silanes with two silicone groups offer superior hydrolytic stability, preventing interfacial failure in humid conditions.
Area of Science:
- Materials Science
- Polymer Chemistry
- Surface Chemistry
Background:
- Polyfunctional silanes are crucial for improving the adhesion between silica surfaces and polymeric resins.
- Understanding the hydrolytic stability of these silanes at the silica-polymer interface is essential for durable composite materials.
Purpose of the Study:
- To design polyfunctional silanes that form stable multisilane layers on silica surfaces.
- To investigate the hydrolytic stability of these silanes at the silica-polymer interface using tensile testing.
Main Methods:
- Conventional tensile testing was employed to evaluate the bonding strength.
- Specimens were immersed in boiling water to assess hydrolytic degradation over time.
- Analysis of failure mechanisms (cohesive vs. interfacial) was conducted.
Main Results:
- Tensile bonding strength decreased with increased immersion time in boiling water.
- Failure mode shifted from cohesive matrix failure to interfacial failure.
- Interfacial failure initiation time depended on silane concentration and the number of silicone functional groups.
Conclusions:
- Silanes with two silicone functional groups exhibited greater hydrolytic stability compared to mono- or trisilicone functionalized silanes.
- The stability of the silane layer is critical for maintaining interfacial integrity under hydrolytic stress.
- Optimizing silane structure is key to enhancing the long-term durability of silica-polymer interfaces.