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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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Published on: April 10, 2017

A thermally re-mendable cross-linked polymeric material.

Xiangxu Chen¹, Matheus A Dam, Kanji Ono

¹Exotic Materials Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)

|March 2, 2002

Summary

This summary is machine-generated.

This study introduces a novel transparent polymer capable of self-healing multiple times under mild conditions. The material exhibits robust mechanical properties comparable to epoxy resins, offering a sustainable solution for material repair.

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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Published on: September 19, 2020

Area of Science:

Polymer Science
Materials Science
Organic Chemistry

Background:

Traditional polymers often lack self-repair capabilities, leading to material waste and replacement.
The development of self-healing materials is crucial for enhancing product lifespan and sustainability.

Purpose of the Study:

To develop a transparent, self-healing organic polymeric material.
To investigate the mechanism and reversibility of the material's self-healing properties.
To evaluate the mechanical performance of the self-healing polymer.

Main Methods:

Synthesis of a transparent organic polymer.
Mechanical testing at room temperature and elevated temperatures.
Solid-state nuclear magnetic resonance spectroscopy (NMR) to analyze intermonomer linkages.
Fracture and self-healing experiments under mild conditions.

Main Results:

The developed polymer is transparent and possesses mechanical properties comparable to commercial epoxy resins.
Above 120°C, approximately 30% of intermonomer linkages reversibly disconnect and reconnect upon cooling.
The material can be repeatedly healed without catalysts, additional monomers, or special surface treatments.
Self-healing restores fractured parts of the polymer multiple times.

Conclusions:

A novel, transparent, self-healing polymer has been successfully developed.
The material's self-healing mechanism relies on reversible bond dissociation and reformation.
This self-healing polymer offers a sustainable and efficient alternative to conventional materials for various applications.