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Filler-coupling agent-matrix interactions in silica/polymethylmethacrylate composites
1Center for Bioengineering and Biomaterials, College of Engineering, Temple University, 1947 North 12th Street, Philadelphia, Pennsylvania 19122, USA.
Journal of Biomedical Materials Research
|August 28, 2001
Summary
The study reveals that firmly adsorbed methacryloxypropyltrimethoxysilane (MPS) on fumed silica enhances polymethylmethacrylate (PMMA) composite bonding. Optimal PMMA attachment occurs with a monolayer of MPS, indicating specific adsorption conditions are crucial for material performance.
Area of Science:
- Materials Science
- Polymer Chemistry
- Surface Chemistry
Background:
- Silane coupling agents are vital for enhancing filler-matrix interactions in composites.
- Methacryloxypropyltrimethoxysilane (MPS) is a common silane coupling agent used with silica fillers.
- Understanding the adsorption behavior of MPS on silica is key to optimizing composite properties.
Purpose of the Study:
- To investigate the adsorption interactions of methacryloxypropyltrimethoxysilane (MPS) with fumed silica.
- To determine the effect of MPS adsorption and drying conditions on the subsequent attachment of polymethylmethacrylate (PMMA).
- To optimize the silanation process for improved silica-PMMA composite performance.
Main Methods:
- Thermogravimetric analysis (TGA) to quantify adsorbed MPS and PMMA.
- Fourier transform infrared spectroscopy (FTIR) to analyze chemical interactions.
- Preparation of fumed silica/PMMA composites using silanated silica.
- Varying silane concentrations and drying temperatures.
Main Results:
- Two types of MPS adsorption were identified: loosely and firmly adsorbed.
- Loosely adsorbed MPS could copolymerize with methyl methacrylate, leading to matrix crosslinking.
- Firmly adsorbed MPS showed a positive correlation with PMMA attachment, with monolayer adsorption being most efficient.
- Drying at 110°C removed loosely adsorbed silane and increased firmly adsorbed silane.
Conclusions:
- The drying temperature significantly influences the state of MPS adsorption on fumed silica.
- Firmly adsorbed MPS is crucial for effective bonding between fumed silica and the PMMA matrix.
- Optimizing MPS adsorption as a monolayer is essential for maximizing PMMA attachment and composite performance.