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"Fatigue-Crack Propagation Behavior in Microcapsule-Containing Self-Healing Polymeric Networks"
Ana P P Fugolin1, Jack L Ferracane1, Carmem S Pfeifer1
1Oregon Health & Science University, Restorative Dentistry Department - Division of Biomaterials and Biomechanics, 2730 S Moody Avenue, Portland, OR 97201, United States.
Materials & Design
|November 16, 2022
Summary
Dental self-healing polymers were enhanced using microcapsules containing N,N-Dimethylacrylamide (DMAM). This innovation improved crack resistance and toughness, extending the lifespan of dental restorations.
Area of Science:
- Polymer Science
- Biomaterials Science
- Dental Materials
Background:
- Dental restorations face limited clinical lifespans due to material degradation and cracking.
- Self-healing polymers offer a promising strategy to enhance the durability and longevity of dental materials.
- Microcapsule-based self-healing systems are actively researched for improved material performance.
Purpose of the Study:
- To innovate microcapsule-based self-healing polymers for dental applications by incorporating N,N-Dimethylacrylamide (DMAM).
- To analyze the impact of DMAM-containing microcapsules on crack propagation and mechanical properties of highly crosslinked polymer networks.
- To investigate the challenges and solutions in microencapsulating hydrophilic, high vapor pressure agents like DMAM.
Main Methods:
- Development of microcapsule-based self-healing systems with DMAM as a core healing agent.
- Tailoring microcapsule shell properties to accommodate the hydrophilic and high vapor pressure nature of DMAM.
- Incorporation of microcapsules into a highly crosslinked polymer network.
- Analysis of crack propagation behavior, toughness, and viscoelastic properties (G'/G" crossover, storage modulus).
Main Results:
- Successful microencapsulation of DMAM was achieved by tailoring shell properties, overcoming challenges posed by its hydrophilicity and vapor pressure.
- DMAM addition increased the G'/G" crossover time from 0.06s to 0.57s and decreased storage modulus from 8.0 GPa to 0.5 GPa.
- Incorporation of microcapsules significantly enhanced the polymer network, increasing toughness by up to 50% and energy for crack propagation by up to 100% at 20 wt% DMAM.
Conclusions:
- DMAM acts as an effective cushioning agent, improving the mechanical properties and self-healing capabilities of dental polymers.
- Tailoring microcapsule shell properties is crucial for effective encapsulation of challenging core materials like DMAM.
- This microcapsule-based self-healing strategy shows significant potential for developing more durable and longer-lasting dental restorations.
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