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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

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PCL-b-PLLA diblock copolymers with high performance to replace polyoxymethylene for tissue ligation clips.

Quan Zhao1, Ziyun He1, Lei Tang1

  • 1National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu, 610064, China. bhe@scu.edu.cn.

Journal of Materials Chemistry. B
|June 16, 2026
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Summary

New biodegradable tissue clips made from poly(ε-caprolactone) and poly(L-lactide) copolymers offer comparable strength to polyoxymethylene (POM) clips. These absorbable clips provide rigidity, toughness, and biodegradability for safe tissue ligation.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Surgical Devices

Background:

  • Current absorbable tissue ligation clips made from biodegradable polymers lack the rigidity and toughness of polyoxymethylene (POM) clips.
  • There is a need for biodegradable alternatives that match the mechanical properties of conventional non-absorbable clips.

Purpose of the Study:

  • To design and synthesize biodegradable copolymers of poly(ε-caprolactone) (PCL) and poly(L-lactide) (PLLA) with random and block architectures.
  • To evaluate the mechanical properties, biodegradability, and in vivo performance of these novel copolymers for tissue ligation applications.

Main Methods:

  • Synthesis of random (P(CL-r-LLA)) and diblock (PCL-b-PLLA) copolymers.
  • Characterization of copolymer crystallinity and mechanical strength.
  • Evaluation of clip closure force, degradation profiles, and subcutaneous implantation in rats.

Main Results:

  • Diblock copolymer PCL-b-PLLA exhibited higher crystallinity and superior mechanical strength compared to random copolymer P(CL-r-LLA).
  • BP15 clips (15 mol% CL) demonstrated a closure force comparable to commercial POM clips (27.9 ± 1.4 N vs. 29.0 ± 2.4 N).
  • BP15 clips maintained structural integrity and closure function for two weeks, with favorable subcutaneous implantation outcomes in rats.

Conclusions:

  • Biodegradable diblock copolymers of PCL and PLLA offer a promising alternative to POM for absorbable tissue ligation clips.
  • The developed BP15 clips possess suitable mechanical properties, controlled degradation, and biocompatibility for surgical applications.
  • These novel clips address the limitations of current biodegradable options, providing both rigidity and toughness simultaneously.