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Molecular Weight of Step-Growth Polymers01:08

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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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Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
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Bio-Based Polyurethane Foams with Castor Oil Based Multifunctional Polyols for Improved Compressive Properties.

Joo Hyung Lee1, Seong Hun Kim1, Kyung Wha Oh2

  • 1Department of Organic and Nano Engineering, College of Engineering, Hanyang University, Seoul 04763, Korea.

Polymers
|March 6, 2021
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Summary

This study synthesizes sustainable polyurethane (PU) foam using castor oil-based polyols. Multifunctional polyol blends enhance the foam

Keywords:
castor oilmultifunctional polyolpolyol blendpolyurethane foamthiol-ene click reaction

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Chemistry

Background:

  • Commercial polyurethane (PU) foam production relies heavily on petrochemicals, raising environmental concerns.
  • Castor oil (CO) offers a sustainable, bio-based alternative for polyol synthesis.
  • Improving PU foam's efficiency, sustainability, and mechanical properties is crucial for applications like protective equipment.

Purpose of the Study:

  • To synthesize multifunctional polyols from castor oil.
  • To investigate the impact of castor oil-based polyol blends on PU foam properties.
  • To enhance the compressive strength and overall performance of bio-based PU foam.

Main Methods:

  • Synthesis of high-functionality CO-based polyols using a thiol-ene click reaction.
  • Preparation and viscosity analysis of polyol blends (castor oil and CO-based polyols).
  • Fabrication of PU foams via a free-rising method and characterization of their properties.

Main Results:

  • Successful synthesis and characterization of CO-based polyols.
  • Demonstrated influence of polyol blend composition on foam structure, morphology, and thermal properties.
  • Significant improvement in compressive properties of PU foams fabricated from multifunctional polyol blends.

Conclusions:

  • Multifunctional polyol blends derived from castor oil are effective for producing high-performance bio-based PU foams.
  • This approach offers a sustainable alternative to petrochemical-based polyols.
  • Findings may expand applications for bio-based polyurethane foams in impact-absorbing materials.