The research group selected surface modified carbon nanofibers (CNF) and caprolactam to prepare PA6/CNF composites by in-situ anion ring-opening polymerization. Through experiments, the surface-modified CNF is uniformly dispersed. The addition of a small amount of CNF leads to the filler-matrix stress transfer induced by the interfacial covalent bond, which can significantly increase the tensile strength of PA6. At the same time, CNF plays a role in the matrix during crack propagation. The role of the bridge has also increased the notched impact strength of the PA6.
Tianjin University of Technology used bamboo fiber and PP fiber as raw materials to prepare mixed fiber preforms by non-woven engineering. The bamboo fiber reinforced PP thermoplastic composite was prepared by hot pressing process. The mass ratio of bamboo fibrils to PP fibers is 50/50. When the molding temperature, time and pressure are 190 °C, 30 min and 30 MPa, respectively, the obtained composites have the best mechanical properties, and their tensile strengths in the longitudinal and transverse directions are 96.6 respectively. MPa and 82.3 MPa; longitudinal and transverse bending strengths are 400.7 MPa and 367.3 MPa, respectively.