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Tailoring lactide/caprolactone co-oligomers as tissue adhesives
1The Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Givat Ram Campus Israel, 91904 Jerusalem, Israel. danielc@vms.huji.ac.il
Biomaterials
|June 3, 2004
Summary
Novel biocompatible tissue adhesives utilize temperature-dependent rheology for in vivo application without chemical reactions. Optimized oligomers with specific biodegradable segments demonstrate enhanced adhesive strength and non-toxicity, crucial for medical use.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Tissue Engineering
Background:
- Current tissue adhesives often rely on chemical or biochemical reactions, posing potential risks in vivo.
- Biocompatibility and biodegradability are critical requirements for safe and effective tissue adhesives.
- Understanding the relationship between polymer structure and adhesive properties is essential for developing advanced medical materials.
Purpose of the Study:
- To introduce novel biocompatible tissue adhesives based on temperature-dependent rheological properties.
- To synthesize and characterize branched oligomers with tailored biodegradable segments for improved adhesive performance.
- To investigate the influence of polymer composition, particularly the length of PLA blocks and incorporation of CL units, on adhesive strength and glass transition temperature.
Main Methods:
- Synthesis of branched oligomers using trimethylolpropane as a core molecule and biodegradable lactoyl (LA) and caprolactone (CL) units.
- Investigation of the relationship between oligomer composition and adhesive properties under in vitro conditions.
- Measurement of glass transition temperature (T(g)) and Adhesive Failure Strength (AFS) at 37°C.
Main Results:
- Oligomers with glass transition temperatures in the 20-25°C range exhibited superior performance.
- A strong correlation was observed between PLA block length, T(g), and AFS at physiological temperature.
- Incorporation of caprolactone units enhanced flexibilization, enabling longer biodegradable chains and improved adhesive strength.
Conclusions:
- The developed oligomers offer a promising alternative for biocompatible tissue adhesion without requiring chemical reactions in vivo.
- The TMP(LA(16)-CL(2)-LA(16)-CL(2)-LA(16))(3) oligomer demonstrated particularly high in vitro adhesive failure strength.
- Tailoring polymer composition, specifically the balance of PLA and CL units, is key to optimizing temperature-dependent rheological properties for effective tissue adhesives.