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One-Component Degradable High-Thermal-Conductivity Liquid Crystal Epoxy Resins and Their Composites Based on

Changbo Zhao1, Guohua Huang2, Hui Xie2

  • 1Advanced Materials Research Institute, College of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, P. R. China.

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|March 25, 2025
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Summary

A new self-curing method for liquid crystal epoxy resins (LCERs) enhances thermal conductivity by preserving the liquid crystal phase. This approach also enables sustainable filler recovery for advanced electronic applications.

Keywords:
density functional theoryliquid crystal epoxyschiff baseself‐curingthermal conductive composites

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • High thermal conductivity liquid crystal epoxy resins (LCERs) are crucial for thermal management in electronics.
  • Conventional LCER production uses curing agents that disrupt the liquid crystal phase, limiting thermal performance.
  • Existing methods hinder the development of advanced LCERs with superior thermal conductivity.

Purpose of the Study:

  • To develop a novel self-curing strategy for LCERs that preserves the liquid crystal phase.
  • To enhance the thermal conductivity of LCERs and their composites.
  • To enable sustainable recovery of fillers from LCER composites.

Main Methods:

  • Incorporation of a Schiff base into liquid crystal epoxy monomers for self-curing without external agents.
  • Synthesis and characterization of self-cured LCERs (LCEP-SC) and their composites with hexagonal boron nitride (BN).
  • Evaluation of thermal conductivity and degradability in acidic solutions.

Main Results:

  • The self-cured LCEP-SC resin achieved a thermal conductivity of 0.36 W mK⁻¹, a 133% increase compared to amine-cured counterparts.
  • LCEP-SC-BN composites (10 wt.% BN) showed a thermal conductivity of 0.61 W mK⁻¹, outperforming conventional composites by 42%.
  • The dynamic Schiff base enabled efficient degradation and recovery of BN fillers in acidic DMF/water solutions.

Conclusions:

  • The self-curing strategy effectively retains the ordered liquid crystal phase, significantly boosting thermal conductivity.
  • This method offers a sustainable route for high-performance LCERs and composites with enhanced thermal management and recyclability.
  • The developed LCERs are promising for advanced electronic applications requiring efficient heat dissipation and material recovery.