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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
Published on: October 10, 2016
Biodegradable block poly(ester-urethane)s based on poly(3-hydroxybutyrate-co-4-hydroxybutyrate) copolymers
Wenfeng Ou1, Handi Qiu, Zhifei Chen
1Multidisciplinary Research Center, Shantou University, Daxue Lu 243, Shantou, Guangdong 515063, China.
Biodegradable poly(ester-urethane)s (PU3/4HB) show potential as hemostatic materials due to enhanced platelet adhesion and non-toxicity. Tailoring composition and chain length allows for tunable biocompatibility for biomedical applications.
Area of Science:
- Polymer Chemistry
- Biomaterials Science
- Materials Engineering
Background:
- Biodegradable polymers are crucial for biomedical applications.
- Poly(ester-urethane)s offer tunable properties for advanced materials.
- Developing effective hemostatic materials remains a significant challenge.
Purpose of the Study:
- To synthesize and characterize novel biodegradable poly(ester-urethane)s (PU3/4HB) based on poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P3/4HB) segments.
- To evaluate the biocompatibility and hemostatic potential of these novel polyurethanes.
- To investigate the relationship between material properties (crystallinity, hydrophobicity, SFE) and biological performance.
Main Methods:
- Synthesis via melting polymerization using 1,6-hexamethylene diisocyanate (HDI) and stannous octanoate (Sn(Oct)(2)).
- Characterization using NMR, FTIR, GPC, DSC, and TGA.
- Evaluation of hydrophilicity, surface free energy (SFE), platelet adhesion (LDH assay), and cytotoxicity (CCK-8 assay).
Main Results:
- Synthesized PU3/4HB materials exhibited tunable thermal properties (Tg: -25.6°C to -4.3°C) and crystallinity (2.5% to 25.3%).
- Materials were hydrophobic (water contact angle 77.4°-95.9°) with varying surface free energies.
- Enhanced platelet adhesion and activation were observed, indicating potential hemostatic properties, with higher performance than PLA.
- Cytotoxicity assays confirmed non-toxicity and supported cell growth and proliferation, with hydrophobicity influencing cell growth and 3HB content affecting proliferation.
Conclusions:
- The synthesized poly(ester-urethane)s (PU3/4HB) demonstrate promising hemostatic capabilities and excellent biocompatibility.
- Material properties like crystallinity, hydrophobicity, and surface free energy significantly influence platelet adhesion and biological response.
- Tunable composition and chain length of P3/4HB-diol prepolymers allow for precise control over the biocompatibility of these polyurethanes for tailored biomedical applications.
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