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Related Concept Videos

Types of Damping01:20

Types of Damping

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If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
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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 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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Bio-Based Polyurethane and Its Composites towards High Damping Properties.

Shikai Hu1,2,3, Yaowen Wu1, Guoqing Fu1

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

International Journal of Molecular Sciences
|June 24, 2022
PubMed
Summary

This study developed sustainable, bio-based polyurethane composites with enhanced damping properties at room temperature. These materials offer a greener alternative to petroleum-based damping solutions.

Keywords:
AO-80PLA-based polyolscompositesdamping propertypolyurethane

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Engineering

Background:

  • Mechanical equipment generates harmful vibrations and noise.
  • Conventional damping materials are petroleum-based and have low glass transition temperatures.
  • There is a need for bio-based damping materials with high performance at room temperature.

Purpose of the Study:

  • To fabricate and evaluate bio-based millable polyurethane (BMPU)/hindered phenol composites.
  • To achieve high damping properties at room temperature using sustainable resources.
  • To reduce reliance on fossil fuels for damping material production.

Main Methods:

  • Synthesized BMPUs using modified poly (lactic acid)-based polyols and other monomers.
  • Incorporated hindered phenol antioxidant (AO-80) to create BMPU/AO-80 composites.
  • Systematically evaluated the damping properties and glass transition temperatures of the composites.

Main Results:

  • BMPU/AO-80 composites showed increased glass transition temperature (Tg) from 7.8 °C to 13.5 °C.
  • Maximum loss factor (tan δmax) improved by 43%, from 1.4 to 2.0.
  • The developed composites exhibited superior damping properties at room temperature compared to other polyurethanes.

Conclusions:

  • The fabricated BMPU/AO-80 composites offer high damping performance at room temperature.
  • This research presents a sustainable strategy for developing damping materials from renewable resources.
  • The study contributes to reducing the dependence on petroleum-based products in the materials industry.