Shin Jongseon, Lee Kyunbae, Jung Yeonsu, Park Byeongjin, Yang Seung Jae, Kim Taehoon, Lee Sang Bok
Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Korea.
Composites Research Division, Korea Institute of Materials Science, Changwon 51508, Korea.
Materials (Basel). 2020 Dec 29;14(1):106. doi: 10.3390/ma14010106.
Carbon nanotube fiber (CNTF), prepared by the direct-spinning method, has several nanopores, and the infiltration behavior of resins into these nanopores could influence the mechanical properties of CNTF-based composites. In this work, we investigated the infiltration behavior of resin into the nanopores of the CNTFs and mechanical properties of the CNTF-based single-fiber composites using six epoxy resins with varying viscosities. Epoxy resins can be easily infiltrated into the nanopores of the CNTF; however, pores appear when a resin with significantly high or low viscosity is used in the preparation process of the composites. All the composite fibers exhibit lower load-at-break value compared to as-densified CNTF, which is an unexpected phenomenon. It is speculated that the bundle structure of the CNTF can undergo changes due to the high affinity between the epoxy and CNTF. As composite fibers containing pores exhibit an even lower load-at-break value, the removal of pores by the defoaming process is essential to enhance the mechanical properties of the composite fibers.
通过直接纺丝法制备的碳纳米管纤维（CNTF）具有多个纳米孔，树脂向这些纳米孔中的渗透行为会影响基于CNTF的复合材料的力学性能。在这项工作中，我们使用六种粘度不同的环氧树脂，研究了树脂向CNTF纳米孔中的渗透行为以及基于CNTF的单纤维复合材料的力学性能。环氧树脂能够很容易地渗透到CNTF的纳米孔中；然而，在复合材料的制备过程中，当使用粘度显著过高或过低的树脂时会出现孔隙。与致密化后的CNTF相比，所有复合纤维的断裂载荷值都较低，这是一个意外现象。据推测，由于环氧树脂与CNTF之间的高亲和力，CNTF的束状结构可能会发生变化。由于含有孔隙的复合纤维的断裂载荷值更低，通过消泡工艺去除孔隙对于提高复合纤维的力学性能至关重要。
