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Related Concept Videos

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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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Shape memory polyurethanes crosslinked with castor oil-based multifunctional polyols.

Joo Hyung Lee1,2, Seong Hun Kim3

  • 1The Research Institute of Industrial Science, Hanyang University, Seoul, 04763, South Korea.

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|September 11, 2023
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Summary
This summary is machine-generated.

This study introduces novel castor oil-based polyols for creating advanced bio-based shape memory polyurethanes (SMPUs). These enhanced polyols significantly improve the mechanical strength of SMPUs, enabling new material applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomass Utilization

Background:

  • Growing interest in biomass-based smart materials.
  • Need for improved bio-derived polyols in polyurethane synthesis.
  • Limitations of current bio-derived polyols due to low functionality.

Purpose of the Study:

  • To develop multifunctional polyols from castor oil (CO) using thiol-ene click chemistry.
  • To synthesize bio-based shape memory polyurethanes (SMPUs) using these novel polyols.
  • To evaluate the impact of enhanced polyols on SMPU properties and performance.

Main Methods:

  • Grafting thiols (1-mercaptoethanol or α-thioglycerol) onto castor oil via thiol-ene click reaction.
  • Synthesis of SMPUs using a two-step prepolymer method with synthesized polyols.
  • Characterization of polyol functionality (OH value) and SMPU chemical structure.
  • Analysis of mechanical properties, phase separation, and shape memory behavior.

Main Results:

  • Castor oil-based multifunctional polyols (COT) exhibited a significantly higher OH value (380 mg KOH/g) compared to original CO.
  • Successful synthesis of bio-based SMPUs confirmed by chemical analysis.
  • Increased crosslinking density limited phase separation between soft and hard segments.
  • SMPUs crosslinked with COT showed an 80% improvement in mechanical strength and a 26% decrease in elongation compared to CO-crosslinked SMPUs.

Conclusions:

  • Castor oil-based multifunctional polyols can be effectively synthesized using thiol-ene click chemistry.
  • These enhanced polyols lead to improved mechanical properties in bio-based SMPUs.
  • The developed materials demonstrate potential for advanced applications requiring strong and functional shape memory polyurethanes.