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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.5K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.5K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.9K

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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
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Photo-, Thermal-, and Electro-Responsive Polyolefin-Based Actuators

Quan Wang1, Haoxiang Sun1, Chen Zou1

  • 1State Key Laboratory of Precision and Intelligent Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.

Angewandte Chemie (International ed. in English)
|January 14, 2026
PubMed
まとめ

This study introduces novel polyolefin-based actuators using in situ polymerization for enhanced mechanical strength and rapid stimuli-responsiveness. These cost-effective materials offer high work capacity for soft robotics and artificial muscles.

キーワード:
ActuatorsPolymerizationPolyolefinsStimuli-responsive

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科学分野:

  • Materials Science
  • Polymer Chemistry
  • Robotics

背景:

  • Stimuli-responsive polymers are key in soft robotics and artificial muscles.
  • Polyolefins, though scalable and low-cost, are underutilized in actuator fabrication.
  • Existing methods struggle with phase separation in polymer composites.

研究 の 目的:

  • To develop multifunctional polyolefin-based actuators using an in situ polymerization strategy.
  • To overcome phase separation issues common in traditional polymer blending.
  • To achieve exceptional mechanical strength, rapid stimuli-responsiveness, and high work capacity.

主な方法:

  • Fabrication of polyolefin-based actuators via in situ ethylene polymerization.
  • Development of PANI/CNTs-COOH composite fillers as catalytic supports for nickel catalysts.
  • Achieving uniform dispersion of functional fillers within a branched polyethylene matrix.

主要な成果:

  • Composites exhibited a maximum tensile stress of 135 MPa after training.
  • Tunable electrical conductivity and high photothermal conversion efficiency were achieved.
  • Materials demonstrated self-healing and triple-stimuli-responsive shape-memory behavior.
  • Actuators showed programmable actuation with a work capacity of 470.4 J kg⁻¹.

結論:

  • The in situ polymerization strategy successfully created advanced polyolefin-based actuators.
  • These actuators possess superior mechanical and responsive properties compared to traditional materials.
  • The developed materials hold significant potential for soft robotics and artificial muscle applications.