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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Fabricating Remote-Controllable Dynamic Ionomer/CNT Networks via Cation-π Interaction for Multi-Responsive Shape

Yi Xiao1, Dan Liu1, Ling-Ying Shi2

  • 1The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China.

ACS Applied Materials & Interfaces
|March 5, 2025
PubMed
Summary

This study introduces a novel ionomer/carbon nanotube composite for advanced shape memory polymers (SMPs). These materials offer remotely controllable shape memory effects and self-healing, crucial for smart devices.

Keywords:
cation–π interactionionomersmultiresponsiveself-healingshape memory polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Shape memory polymers (SMPs) are vital for actuating applications in biomedical and aeronautic fields.
  • Remotely controllable triggering is a key requirement for advanced SMP applications.

Purpose of the Study:

  • To develop a novel ionomer/carbon nanotube (CNT) composite network with enhanced shape memory effects (SMEs) and self-healing capabilities.
  • To investigate the synergistic effects of ionic clusters and cation-π interactions for improved material performance.

Main Methods:

  • Synthesized PCLQA ionomers by covalently bonding quaternary ammonium (QA) units to crystalline polycaprolactone (PCL) segments.
  • Incorporated multiresponsive carbon nanotubes (CNTs) into the PCLQA matrix to form PCLQA@CNT composites.
  • Characterized the mechanical properties, shape memory performance, and antibacterial effects of the developed composites.

Main Results:

  • The PCLQA@CNT composites exhibited superior mechanical properties (tensile strength > 40 MPa, elongation at break > 1900%).
  • Achieved excellent thermally induced SME with high shape fixity (99.6%) and recovery (92.3%).
  • Demonstrated significant antibacterial activity (>99%) and self-healing capabilities via remote stimulation (NIR and electrical).

Conclusions:

  • The novel PCLQA@CNT network, stabilized by ionic clusters and cation-π interactions, offers robust, remotely controllable shape memory and self-healing properties.
  • The material's enhanced performance and multifunctionality pave the way for advanced intelligent devices.
  • This research highlights the potential of ionomer/CNT composites for next-generation smart materials.