Failure characteristics of multiple-component fibrin-based adhesives

Area of Science:

• Biomaterials Science
• Materials Engineering
• Tissue Engineering

Background:

• Fibrin-based adhesives are utilized in various medical applications.
• Understanding their mechanical properties and failure mechanisms is crucial for optimizing performance.
• The influence of fibrin concentration on these characteristics requires detailed investigation.

Purpose of the Study:

• To characterize the failure mechanisms of fibrin-based adhesives.
• To evaluate the effect of fibrin concentration (high vs. low) on mechanical properties.
• To compare failure modes under different testing conditions.

Main Methods:

• Uniaxial, monotonic tensile testing of bulk fibrin gels.
• Blister testing using porcine skin grafts as adherends.
• Analysis of failure characteristics at varying strain rates and fibrin concentrations.

Main Results:

• Fibrin gels exhibited strain hardening, with increased modulus of elasticity at higher strain rates.
• High fibrin concentration adhesives demonstrated greater ultimate tensile strength and modulus of elasticity.
• Failure modes shifted from cohesive to adhesive with increasing strain rate in high concentration gels.

Conclusions:

• Fibrin concentration significantly influences the mechanical properties and failure modes of fibrin-based adhesives.
• Higher fibrin concentrations lead to enhanced strength, stiffness, and fracture energy.
• Fibrin's behavior transitions from viscous to elastic with increasing concentration, impacting adhesive performance.