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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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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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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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Stress-memory polymeric filaments for advanced compression therapy.

Harishkumar Narayana1, Jinlian Hu, Bipin Kumar

  • 1Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong-999077, China. tchujl@polyu.edu.hk.

Journal of Materials Chemistry. B
|April 9, 2020
PubMed
Summary
This summary is machine-generated.

Researchers discovered novel stress-memory behavior in polyurethane filaments, outperforming films due to enhanced crystallization from melt spinning. This finding optimizes smart material design for applications like compression stockings.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Smart Materials

Background:

  • Shape memory polymers (SMPs) are stimulus-responsive smart materials with diverse applications.
  • Understanding stress-memory behavior in SMPs is crucial for advanced material design.
  • Novel stress-memory phenomena at the fiber level remain largely unexplored.

Purpose of the Study:

  • To synthesize semi-crystalline segmented polyurethane for filaments and films.
  • To systematically investigate and compare the stress-memory behavior of these materials.
  • To elucidate the fundamental mechanisms behind stress-memory performance in filaments versus films.

Main Methods:

  • Synthesis of semi-crystalline segmented polyurethane.
  • Preparation of material in filament/fiber and film forms.
  • Tensile stress-memory programming at varying strain levels (20%, 40%, 60%) and temperature-dependent analysis.
  • Characterization of thermal and mechanical properties.
  • Fabrication and testing of smart filament integrative fabrics.

Main Results:

  • Polyurethane filaments exhibited superior stress-memory response compared to films.
  • Melt spinning induced perfect crystallization and ordered polymer packing in filaments, enhancing memory stress.
  • Memory stress evolution showed a linear correlation with strain and temperature (r² = 0.91-1).
  • Demonstrated stress-memory behavior in smart filament integrative fabrics.

Conclusions:

  • Melt-spun polyurethane filaments possess significant stress-memory capabilities due to enhanced crystallization.
  • Filament-level stress-memory behavior offers precise control for smart material applications.
  • This research provides fundamental insights for optimizing memory stress in smart structures, including compression stockings.