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Related Concept Videos

Polymer Classification: Architecture01:14

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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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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Related Experiment Video

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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Electron Beam Crosslinked Polyurethane Shape Memory Polymers with Tunable Mechanical Properties.

Keith Hearon1, Landon D Nash1, Brent L Volk2

  • 1Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA.

Macromolecular Chemistry and Physics
|November 21, 2014
PubMed
Summary
This summary is machine-generated.

Novel electron beam crosslinked polyurethane shape memory polymers offer tunable properties and advanced processing. Researchers precisely engineered these polymers for applications like neurovascular stents.

Keywords:
electron beam curingpolyurethanesprocessingstimuli-sensitive polymersstructure–property relations

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomedical Engineering

Background:

  • Shape memory polymers (SMPs) are advanced materials with the ability to recover their original shape when subjected to a stimulus.
  • Polyurethanes are a versatile class of polymers widely used in various applications due to their tunable properties.
  • Existing methods for crosslinking SMPs often lack the precision required for advanced applications and mass production.

Purpose of the Study:

  • To synthesize and characterize novel electron beam crosslinked polyurethane shape memory polymers.
  • To demonstrate the ability to precisely tune thermomechanical properties by manipulating crosslink density.
  • To engineer low-molecular-weight polyurethane systems for mass thermoplastic processing.

Main Methods:

  • Electron beam irradiation was used to crosslink polyurethane precursors.
  • Varying precursor formulations allowed for precise control over crosslink density.
  • Thermomechanical properties including modulus, strain capacity, tensile strength, recovery stress, and glass transition temperature were characterized.
  • Prototype fabrication using dip-coating and laser machining was performed to assess processability.

Main Results:

  • Successfully synthesized electron beam crosslinked polyurethane shape memory polymers.
  • Demonstrated precise control over crosslink density, leading to tunable thermomechanical properties.
  • Achieved fine-tuning of rubbery modulus, strain capacity, tensile strength, recovery stress, and glass transition temperature.
  • Showcased the suitability of the engineered polymer system for mass thermoplastic processing.

Conclusions:

  • Electron beam crosslinking provides advanced processing capabilities for polyurethane shape memory polymers.
  • The ability to finely tune thermomechanical properties in a low-molecular-weight system is a significant advancement.
  • The developed materials and processing methods are suitable for fabricating functional prototypes, such as neurovascular stents.