Limiting plant fibre damage during industrial processing is challenging for biobased composite development due to plant cell wall sensitivity to temperature and shear. This study developed an innovative fluorophore grafting method to indirectly monitor flax fibre morphological damage during twin-screw extrusion in a poly-(caprolactone) matrix. Results showed the fluorophore was strongly degraded after severe process conditions, with −87.1 % and −72.2 % changes in fluorescence intensity at 240 °C and 300 rotations per minute, respectively, compared to native fluorescence. The fluorescence intensity correlated well with the fibre aspect ratio and length, making it a reliable indicator of the fibre’s morphology degradation.

由于植物细胞壁对温度和剪切力敏感，在工业加工过程中限制植物纤维损伤对于生物基复合材料的开发来说是一个挑战。本研究开发了一种创新的荧光团接枝方法，可间接监测聚（己内酯）基质中双螺杆挤出过程中亚麻纤维的形态损伤。结果显示，在严酷的工艺条件下，荧光团发生强烈降解，与天然荧光相比，在 240 °C 和每分钟 300 转的条件下，荧光强度变化分别为 -87.1 % 和 -72.2 %。荧光强度与纤维长径比和长度密切相关，使其成为纤维形态退化的可靠指标。