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<p>Annealing treatment provides an effective strategy for tailoring the microstructure and mechanical performance of liquid crystalline polymer (LCP) films. In this study, isotropic LCP films were fabricated through a rotational blow molding process that generates a uniform fiber-crossing architecture. The influence of tension-free annealing at 240&#xa0;°C for up to 5&#xa0;h on the thermal behavior, molecular ordering, crystallization characteristics, and mechanical properties was systematically investigated. Dynamic mechanical analysis reveals that annealing promotes molecular chain mobility and packing rearrangement, leading to enhanced elastic modulus and elevated fracture temperature. Complementary DSC, XRD, and WAXS results demonstrate that annealing induces the formation of newly developed microcrystalline domains and lattice perfection while preserving the macroscopic isotropy of the films. SEM analysis further confirms the evolution from a relatively featureless morphology to a dense and continuous three-dimensional network. These microstructural transformations collectively contribute to simultaneous improvements in tensile strength and ductility, with optimal performance achieved after 3 h of annealing (≈ 240&#xa0;MPa tensile strength and &gt; 10% elongation at break). This work elucidates the coupled microstructure–property evolution of isotropic LCP films under annealing and provides guidance for performance optimization of LCP-based high-performance materials.</p> Graphical abstract <p></p>

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Microstructure evolution and performance enhancement of rotationally blow-molded isotropic LCP films during annealing treatment

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Zhitao Yang,
  • Jinpeng Liu,
  • Weiheng Xu,
  • Mingwei Sun,
  • Yulei Liu,
  • Hao Liu,
  • Lin Fu

摘要

Annealing treatment provides an effective strategy for tailoring the microstructure and mechanical performance of liquid crystalline polymer (LCP) films. In this study, isotropic LCP films were fabricated through a rotational blow molding process that generates a uniform fiber-crossing architecture. The influence of tension-free annealing at 240 °C for up to 5 h on the thermal behavior, molecular ordering, crystallization characteristics, and mechanical properties was systematically investigated. Dynamic mechanical analysis reveals that annealing promotes molecular chain mobility and packing rearrangement, leading to enhanced elastic modulus and elevated fracture temperature. Complementary DSC, XRD, and WAXS results demonstrate that annealing induces the formation of newly developed microcrystalline domains and lattice perfection while preserving the macroscopic isotropy of the films. SEM analysis further confirms the evolution from a relatively featureless morphology to a dense and continuous three-dimensional network. These microstructural transformations collectively contribute to simultaneous improvements in tensile strength and ductility, with optimal performance achieved after 3 h of annealing (≈ 240 MPa tensile strength and > 10% elongation at break). This work elucidates the coupled microstructure–property evolution of isotropic LCP films under annealing and provides guidance for performance optimization of LCP-based high-performance materials.

Graphical abstract