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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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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
09:31

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

From polymeric "plasticine" to shape-controlled mesoporous carbon.

Xu-Fang Qian1, Zheng Wang, Ying Wan

  • 1Department of Chemistry, Shanghai Normal University, Shanghai 200234, PR China.

Journal of Colloid and Interface Science
|May 2, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel soft-phase process to create shape-retaining, mesoporous carbons. This method uses a plasticine-like precursor for advanced material synthesis and applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Developing ordered mesoporous materials with controlled morphology is crucial for advanced applications.
  • Existing synthesis methods often lack control over shape and structural integrity.

Purpose of the Study:

  • To demonstrate a soft-phase intercalating process for synthesizing shape-controlled, mesoporous carbons.
  • To utilize a novel plasticine-like precursor for creating ordered mesoporous polymers and carbons.

Main Methods:

  • A soft-phase intercalation process using amphiphilic triblock copolymer (F127) as a structure-directing agent.
  • Employing reverse triblock copolymer (25R4) as intercalating soft matter and phenolic resin as a carbon source.
  • Template removal at 350°C followed by carbonization at 600°C to yield mesoporous structures.

Main Results:

  • Successful synthesis of a plasticine-like material with an interlayer organic-organic hybrid structure, exhibiting plasticity and shape-ability.
  • Obtained highly ordered mesoporous polymers and carbons maintaining the original shape after template removal and carbonization.
  • Characterized self-supported, shape-controlled mesoporous carbons with high surface areas (495–777 m²/g), large pore volumes (0.32–0.47 cm³/g), uniform pore sizes (2.5–4.3 nm), and hollow tremella-like morphology.

Conclusions:

  • The demonstrated soft-phase process enables the fabrication of shape-controlled, ordered mesoporous carbons.
  • The unique morphology and properties of the synthesized carbons may enhance mass transportation for various applications.
  • This method offers a versatile route for producing advanced porous carbon materials with tailored structures.