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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Thermally Triggered Vanishing Bulk Polyoxymethylene for Transient Electronics.

Dongqing Liu1, Songhe Zhang2, Haifeng Cheng2

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Transient electronics require materials that disappear completely. This study introduces end-capped polyoxymethylene (POM) as a novel transient solid material that vanishes rapidly when thermally triggered, suitable for electronics and packaging.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electronics Engineering

Background:

  • Transient materials are crucial for temporary electronic applications.
  • End-capped polyoxymethylene (POM) offers good mechanical and thermal properties but is typically stable.
  • The transient potential of non-end-capped POM has not been explored.

Purpose of the Study:

  • To investigate non-end-capped POM as a thermally triggered transient solid material.
  • To develop a method for creating POM substrates for electronic devices.
  • To analyze the vanishing mechanism and assess suitability for transient electronics.

Main Methods:

  • Synthesis of non-end-capped POM powder.
  • Chemical vapor deposition to create POM substrates.
  • Physical vapor deposition to fabricate a Cr/Au/SiO2/Cu memristor device.
  • Experimental and theoretical analysis of material formation and vanishing.
  • Thermal triggering to induce depolymerization and disintegration.

Main Results:

  • A novel transient solid material based on non-end-capped POM was developed.
  • A smooth POM substrate was successfully fabricated using chemical vapor deposition.
  • A functional memristor device exhibiting bipolar resistive switching was demonstrated on the POM substrate.
  • Complete vanishing of the POM substrate via thermally triggered depolymerization was confirmed.
  • The material showed excellent transient performance suitable for substrates and packaging.

Conclusions:

  • Non-end-capped POM is a viable thermally triggered transient material.
  • The developed POM substrate is suitable for fabricating electrical devices.
  • This material holds significant promise for transient electronics and information security applications.