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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Triple shape memory effect of star-shaped polyurethane.

Xifeng Yang1, Lin Wang, Wenxi Wang

  • 1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University , Chengdu 610031, P.R. China.

ACS Applied Materials & Interfaces
|March 13, 2014
PubMed
Summary

Researchers developed a star-shaped polyurethane with excellent shape memory properties and good cytocompatibility, making it a promising biomaterial. The study synthesized star-shaped poly(ε-caprolactone) and used MDI and BDO to create a novel smart material.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials Engineering

Background:

  • Star-shaped polyurethanes (SPUs) are advanced polymers with tunable properties.
  • Shape memory polymers (SMPs) offer potential for smart applications.
  • Biocompatible materials are crucial for medical device development.

Purpose of the Study:

  • To synthesize and characterize novel star-shaped polyurethanes (SPUs).
  • To investigate the influence of arm number on SPU properties, particularly shape memory effect.
  • To evaluate the cytocompatibility of the synthesized SPUs for potential biomaterial applications.

Main Methods:

  • Synthesis of star-shaped poly(ε-caprolactone) (SPCL) with varying arm numbers.
  • Polyurethane synthesis using SPCL as soft segment, MDI, and BDO as hard segment.
  • Characterization using proton nuclear magnetic resonance (1H-NMR), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and X-ray diffraction (XRD).
  • In vitro cytotoxicity assay using osteoblasts and Alamar blue assay.

Main Results:

  • Proton nuclear magnetic resonance confirmed the chemical structure of the synthesized SPUs.
  • DSC and DMA showed that increasing hard segment content decreased melting temperature (Tm) and transition temperature (Ttrans).
  • X-ray diffraction revealed increased crystallinity with higher arm numbers, leading to high shape fixity.
  • Six-arm star-shaped polyurethane (6S-PU) exhibited an excellent triple-shape memory effect due to its wide melting temperature range and high crystallinity.
  • In vitro cytotoxicity assays demonstrated good cytocompatibility of the copolymer with osteoblasts.

Conclusions:

  • The synthesized star-shaped polyurethanes possess tunable thermal and mechanical properties.
  • The six-arm star-shaped polyurethane (6S-PU) demonstrates significant potential as a smart material due to its superior shape memory effect.
  • The good cytocompatibility suggests that these SPUs are suitable for future applications in the field of biomaterials.