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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

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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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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Fast-Responding Bio-Based Shape Memory Thermoplastic Polyurethanes.

Zoran S Petrović1, Jelena Milić1, Fan Zhang2

  • 1Kansas Polymer Research Center, Pittsburg State University, Pittsburg, KS 66762.

Polymer
|October 4, 2017
PubMed
Summary
This summary is machine-generated.

New shape-memory polyurethanes derived from plant oils offer fast response times. These bio-based materials exhibit tunable properties and potential biodegradability, making them suitable for diverse applications.

Keywords:
polyurethanepropertiesshape-memorysynthesis

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials

Background:

  • Shape-memory polyurethanes (SMPUs) are advanced materials with applications in various fields.
  • Developing sustainable and bio-based alternatives to conventional SMPUs is crucial for environmental and biomedical applications.

Purpose of the Study:

  • To synthesize novel fast-response shape-memory polyurethanes using bio-based polyols for the first time.
  • To investigate the structure-property relationships of these novel polyurethanes.

Main Methods:

  • Bio-based polyester polyols synthesized from 9-hydroxynonanoic acid (derived from soy and castor oils).
  • Polyurethanes prepared using diphenyl methane diisocyanate and butane diol.
  • Morphology analyzed by synchrotron ultra-small angle X-ray scattering.
  • Thermal, mechanical, and dielectric properties thoroughly investigated.

Main Results:

  • The study successfully prepared novel fast-response shape-memory polyurethanes from bio-based polyols.
  • Synchrotron ultra-small angle X-ray scattering revealed detailed morphology, including phase separation and intermixing.
  • High crystallization rate of the soft segment resulted in adjustable transition temperatures, high elastic elongations, and good mechanical strength.

Conclusions:

  • The synthesized polyurethanes exhibit unique properties suitable for shape-memory applications.
  • Potential biodegradability and biocompatibility suggest suitability for biomedical and environmental applications.
  • This work introduces a sustainable pathway for developing advanced shape-memory materials.