Zhu Shu, Yan Tianwen, Huang Xinlin, Hassan Elwathig A M, Zhou Jianfeng, Zhang Sen, Xiong Mengyun, Yu Muhuo, Li Zhaomin
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint), Key Laboratory of High-Performance Fibers & Products, Ministry of Education, Center for Civil Aviation Composites, Donghua University Shanghai 201620 P. R. China
Key Laboratory of Shanghai City for Lightweight Composites, College of Materials Science and Engineering, Donghua University Shanghai 201620 P. R. China.
RSC Adv. 2022 May 23;12(24):15584-15592. doi: 10.1039/d2ra00667g. eCollection 2022 May 17.
A bioinspired PEEK material with hard "bricks" of nanoscale lamellae and micron-scale deformed spherulites bonded by soft "mortar" of a rigid amorphous fraction was produced with a pressure-induced flow (PIF) processing applied in the solid-state. Novel mechanisms were proposed for the marked and simultaneous improvement in the strength and toughness, where the tensile strength and impact strength could be increased to ∼200% and ∼450%, respectively. On one hand, the rotation, recombination and restacking of the crystalline blocks formed an oriented and stratified morphology similar to the "brick-and-mortar" structure in nacre, and resulted in the confined crack propagations and the tortuous energy dissipating paths. On the other hand, the PIF-relaxation due to the newly generated rigid amorphous fraction further contributed to the improvement of the impact strength. The efficiency of enhancement could be controlled by the molding temperature, the compression ratio, and the volume fraction of chopped carbon fiber. As a result, PIF-processing might endow the PEEK material with improved mechanical matching with the surrounding tissues and extended service life in biomedical applications while retaining excellent biocompatibility with no external substances introduced.
通过在固态下施加压力诱导流动（PIF）工艺，制备了一种具有生物启发的聚醚醚酮（PEEK）材料，该材料由纳米级薄片的硬“砖块”和微米级变形球晶通过刚性非晶部分的软“灰浆”结合而成。提出了新颖的机制来显著同时提高强度和韧性，其中拉伸强度和冲击强度可分别提高到约200%和约450%。一方面，结晶块的旋转、重组和重新堆叠形成了类似于珍珠母中“砖石结构”的取向和分层形态，并导致裂纹的受限扩展和曲折的能量耗散路径。另一方面，新生成的刚性非晶部分引起的PIF松弛进一步有助于提高冲击强度。增强效率可通过成型温度、压缩比和短切碳纤维的体积分数来控制。结果，PIF工艺可能使PEEK材料在生物医学应用中与周围组织具有更好的机械匹配性和更长的使用寿命，同时在不引入外部物质的情况下保持优异的生物相容性。
