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<p>In this study, high-core-content microencapsulated phase change materials (MPCMs) were synthesized and incorporated into lyocell fibers to develop thermoregulating fiber composites with excellent energy storage performance. By optimizing the emulsification system with 6 wt% styrene–maleic anhydride (SMA) as the emulsifier, uniform MPCMs with a low breakage rate and an encapsulation efficiency of 93.4% were obtained, exceeding the typical range (62.9–85.3%) reported for MF-based microcapsules. The MPCMs were homogeneously dispersed into lyocell spinning dope, and composite fibers with 20 wt% MPCMs exhibited superior thermoregulating properties, including a melting enthalpy of 22.8&#xa0;J/g and a crystallization enthalpy of 24.6&#xa0;J/g. The fibers maintained over 98% of their latent heat after 100 thermal cycles and more than 82% after 100 cycles of water and alkali washing, demonstrating excellent thermal reliability and washing durability. They also exhibited strong UV resistance and retained stable thermal and mechanical performance after dynamic wearable testing, confirming their promising durability for practical applications. TGA showed enhanced thermal stability, and infrared thermography confirmed a ~ 120&#xa0;s cooling delay compared with pristine lyocell. These findings present a scalable and eco-friendly strategy for producing durable thermoregulating lyocell fibers for smart textile applications.</p>

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Thermoregulating and durable lyocell fibers enabled by high-encapsulation-efficiency phase change microcapsules

  • 期刊论文

  • 发表日期：

    2026年4月19日

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  • Zhijie Gao,
  • Yueting Wu,
  • Zexin Lin,
  • Peiyu Cui,
  • Caiyue Le,
  • Junlong Yao,
  • Xiaobo Ye,
  • Bin Fang,
  • Yani Guo,
  • Yimin Sun

摘要

In this study, high-core-content microencapsulated phase change materials (MPCMs) were synthesized and incorporated into lyocell fibers to develop thermoregulating fiber composites with excellent energy storage performance. By optimizing the emulsification system with 6 wt% styrene–maleic anhydride (SMA) as the emulsifier, uniform MPCMs with a low breakage rate and an encapsulation efficiency of 93.4% were obtained, exceeding the typical range (62.9–85.3%) reported for MF-based microcapsules. The MPCMs were homogeneously dispersed into lyocell spinning dope, and composite fibers with 20 wt% MPCMs exhibited superior thermoregulating properties, including a melting enthalpy of 22.8 J/g and a crystallization enthalpy of 24.6 J/g. The fibers maintained over 98% of their latent heat after 100 thermal cycles and more than 82% after 100 cycles of water and alkali washing, demonstrating excellent thermal reliability and washing durability. They also exhibited strong UV resistance and retained stable thermal and mechanical performance after dynamic wearable testing, confirming their promising durability for practical applications. TGA showed enhanced thermal stability, and infrared thermography confirmed a ~ 120 s cooling delay compared with pristine lyocell. These findings present a scalable and eco-friendly strategy for producing durable thermoregulating lyocell fibers for smart textile applications.