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Related Concept Videos

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Related Experiment Video

Updated: Dec 27, 2025

A Facile and Eco-friendly Route to Fabricate PolyLactic Acid Scaffolds with Graded Pore Size
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Improving Mechanical Properties and Biocompatibilities by Highly Oriented Long Chain Branching Poly(lactic acid) with

Jiafeng Li1, Qian Chen2, Qin Zhang1

  • 1Department of Materials Science, Fudan University, Shanghai 200433, P. R. China.

ACS Applied Materials & Interfaces
|March 5, 2020
PubMed
Summary

Researchers developed bionic implants using a novel solid-state drawing process. This method enhances mechanical strength and biocompatibility for advanced medical devices like vascular stents.

Keywords:
biocompatibilitiesbionic surfacelong chain branching poly(lactic acid) (b-PLA)solid-state drawingstructure evolution

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Area of Science:

  • Biomaterials Science
  • Polymer Engineering
  • Medical Device Technology

Background:

  • Improving mechanical properties and biocompatibility of polymer materials is crucial for medical implants.
  • Current fabrication methods often face limitations in achieving optimal material performance.

Purpose of the Study:

  • To fabricate bionic implants with enhanced mechanical properties and biocompatibility using a solid-state drawing (SSD) process.
  • To investigate the effect of SSD on the microstructure and surface morphology of poly(lactic acid) (PLA).

Main Methods:

  • Fabrication of bionic implants using a feasible solid-state drawing (SSD) process.
  • Characterization of the mechanical properties (tensile strength, modulus) of the fabricated bionic PLA (b-PLA).
  • Assessment of protein adsorption and osteoblast cell behavior (proliferation, differentiation, activity) on the b-PLA surface.

Main Results:

  • The SSD process yielded b-PLA with high tensile strength (278.1 MPa) and modulus (4.32 GPa).
  • b-PLA exhibited superior protein adsorption (622 ng/cm²), enhanced crystallinity, and surface hydrophobicity.
  • The microvalley surface structure promoted osteoblast adhesion, proliferation, differentiation, and activity, mimicking vascular endothelial microstructures.

Conclusions:

  • The SSD process is a viable method for creating advanced bionic implants with superior mechanical strength and biocompatibility.
  • The unique microvalley surface morphology induced by SSD significantly enhances cellular interaction and tissue integration.
  • These findings offer a promising pathway for developing novel biomaterials for applications such as vascular stents and tissue engineering devices.