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Self-reinforced composite poly(methyl methacrylate): static and fatigue properties
J L Gilbert1, D S Ney, E P Lautenschlager
1Division of Biological Materials, Northwestern University, Chicago, Illinois 60611, USA.
Biomaterials
|September 1, 1995
Summary
A new self-reinforced composite poly(methyl methacrylate) (SRC-PMMA) material shows significantly improved tensile strength, fracture toughness, and fatigue resistance compared to conventional PMMA and bone cement. This advanced composite material demonstrates superior mechanical properties for potential medical and dental applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Polymer Science
Background:
- Poly(methyl methacrylate) (PMMA) is widely used in medical and dental applications.
- Limitations of conventional PMMA include insufficient mechanical strength and fatigue resistance for certain demanding applications.
- Development of advanced composite materials is crucial for enhancing performance in biomedical fields.
Purpose of the Study:
- To introduce and characterize a novel self-reinforced composite poly(methyl methacrylate) (SRC-PMMA) material.
- To evaluate the mechanical properties of SRC-PMMA, including tensile strength, flexural properties, fracture toughness, and fatigue performance.
- To compare the performance of SRC-PMMA against commercial PMMA and bone cement.
Main Methods:
- Fabrication of unidirectional continuous fiber SRC-PMMA using PMMA fibers (40 and 120 microns) in a PMMA matrix.
- Mechanical testing including tensile, three-point flexural, fracture toughness, and flexural fatigue tests.
- Comparison with commercial PMMA and bone cement samples.
- Monitoring of fatigue damage using computer-based algorithms to analyze creep-fatigue displacements, stiffness, and hysteresis damage energy.
Main Results:
- SRC-PMMA exhibited significantly higher tensile strength, tensile modulus, and tensile strain-to-failure compared to commercial PMMA (P < 0.05).
- Flexural strain-to-failure was approximately three times greater in SRC-PMMA than in bone cement and PMMA.
- Fracture toughness was significantly enhanced in SRC-PMMA (up to 3.2 MPa m1/2) compared to PMMA and bone cement (1.3 MPa m1/2) (P < 0.001).
- Fatigue strength of SRC-PMMA was substantially greater (80 MPa at 10^6 cycles) than bone cement and PMMA (approx. 18 MPa) (P < 0.001).
- Hysteresis damage energy to failure was approximately 25 times higher in SRC-PMMA, indicating superior fatigue damage tolerance.
Conclusions:
- SRC-PMMA demonstrates significantly improved mechanical properties, particularly in tensile strength, fracture toughness, and fatigue resistance, over conventional PMMA and bone cement.
- The observed enhancements are attributed to the self-reinforced composite structure.
- SRC-PMMA holds considerable potential for various medical and dental applications requiring high-performance materials.