Lam Tu-Ngoc, Ma Chia-Yin, Hsiao Po-Han, Ko Wen-Ching, Huang Yi-Jen, Lee Soo-Yeol, Jain Jayant, Huang E-Wen
Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30013, Taiwan.
Department of Physics, College of Education, Can Tho University, Can Tho City 900000, Vietnam.
Int J Mol Sci. 2021 Apr 28;22(9):4639. doi: 10.3390/ijms22094639.
The coaxial core/shell composite electrospun nanofibers consisting of relaxor ferroelectric P(VDF-TrFE-CTFE) and ferroelectric P(VDF-TrFE) polymers are successfully tailored towards superior structural, mechanical, and electrical properties over the individual polymers. The core/shell-TrFE/CTFE membrane discloses a more prominent mechanical anisotropy between the revolving direction (RD) and cross direction (CD) associated with a higher tensile modulus of 26.9 MPa and good strength-ductility balance, beneficial from a better degree of nanofiber alignment, the increased density, and C-F bonding. The interfacial coupling between the terpolymer P(VDF-TrFE-CTFE) and copolymer P(VDF-TrFE) is responsible for comparable full-frequency dielectric responses between the core/shell-TrFE/CTFE and pristine terpolymer. Moreover, an impressive piezoelectric coefficient up to 50.5 pm/V is achieved in the core/shell-TrFE/CTFE composite structure. Our findings corroborate the promising approach of coaxial electrospinning in efficiently tuning mechanical and electrical performances of the electrospun core/shell composite nanofiber membranes-based electroactive polymers (EAPs) actuators as artificial muscle implants.
由弛豫铁电体聚（偏氟乙烯-三氟乙烯-氯三氟乙烯）（P(VDF-TrFE-CTFE)）和铁电体聚（偏氟乙烯-三氟乙烯）（P(VDF-TrFE)）聚合物组成的同轴核壳复合电纺纳米纤维，相较于单一聚合物，成功地实现了卓越的结构、机械和电学性能。核壳-TrFE/CTFE膜在旋转方向（RD）和横向（CD）之间展现出更显著的机械各向异性，其拉伸模量更高，为26.9MPa，且强度-延展性平衡良好，这得益于更好的纳米纤维排列程度、更高的密度以及C-F键合。三元共聚物P(VDF-TrFE-CTFE)与共聚物P(VDF-TrFE)之间的界面耦合，使得核壳-TrFE/CTFE与原始三元共聚物之间具有相当的全频介电响应。此外，在核壳-TrFE/CTFE复合结构中实现了高达50.5 pm/V的令人印象深刻的压电系数。我们的研究结果证实了同轴电纺丝在有效调节基于电纺核壳复合纳米纤维膜的电活性聚合物（EAPs）致动器作为人工肌肉植入物的机械和电学性能方面的前景广阔的方法。
