Core-shell electrospun fibers with thermochromic materials are suitable for temperature sensing due to their customizable properties. However, the beneficial effect of bio-based thermochromic fibers incorporating sustainable nanomaterials needs to be further demonstrated, especially regarding their thermal stability and mechanical properties. In this study, core-shell structured nanofibers were produced through a co-axial electrospinning process using polylactic acid (PLA) and surface-modified cellulose nanocrystals (mCNCs) as the shell, and crystal violet lactone (CVL), bisphenol A, and 1-dodecanol as the core. Chemical characterization confirmed the successful grafting of vinyl siloxane within mCNCs, enhancing CNC dispersion in the PLA matrix. The thermochromic fibers exhibited smooth, uniform surfaces, with minimal impact of mCNCs on the glass transition temperature (T). Compared with neat electrospun PLA fibers, mCNC-added fibers showed improved thermal stability. Although the core material negatively affected mechanical properties, mCNCs enhanced tensile strength and Young’s modulus. The fibers demonstrated rapid and sensitive responses to temperature changes from 0 to 20 ˚C, indicating their potential as effective temperature sensors with improved properties.

中文翻译：

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具有改性纤维素纳米晶体的功能性电纺聚乳酸核壳热变色纤维，用于增强温度响应应用


具有热致变色材料的核壳电纺纤维由于其可定制的特性而适用于温度传感。然而，结合可持续纳米材料的生物基热变色纤维的有益效果需要进一步证明，特别是在其热稳定性和机械性能方面。在这项研究中，采用聚乳酸（PLA）和表面改性纤维素纳米晶体（mCNC）作为壳，以及结晶紫内酯（CVL）、双酚A和1，通过同轴静电纺丝工艺生产了核壳结构纳米纤维。 -十二烷醇为核心。化学表征证实乙烯基硅氧烷在 mCNC 中成功接枝，增强了 CNC 在 PLA 基质中的分散性。热致变色纤维具有光滑、均匀的表面，mCNC 对玻璃化转变温度 (T) 的影响最小。与纯电纺 PLA 纤维相比，添加 mCNC 的纤维表现出更高的热稳定性。尽管芯材对机械性能产生负面影响，但 mCNC 增强了拉伸强度和杨氏模量。这些纤维对 0 至 20 ℃ 的温度变化表现出快速、灵敏的响应，表明它们作为具有改进性能的有效温度传感器的潜力。