Mechanochemical Fabrication of Carbon Fiber/Nylon-6 Composites with Interfacial Bondings

Abstract

The mechanochemical fabrication of the composites between carbon fibers (CFs) and nylon-6 (N6) was investigated using a milling process. By the milling, defected surfaces were generated on CFs to obtain the homogeneous length with preserving the cylindrical shape of CF. Fourier transform infrared spectra revealed that the band intensities due to CO, C–N and O–H bondings increased with the milling. The band position of C–N was shifted to a higher wavenumber, while that of CO did not change, implying that the main chain of N6 was dissociated at the C–N neighboring the CO bonds by the force, and subsequently, new bonds between the N atoms of the activated N6 and the C atoms on CFs would be formed. Therefore, the efficient fabrication of the CF/N6 composite fibers with the interfacial bondings was achieved using the mechanochemical reaction.

Microstructural characterization of short glass fiber and PAN based carbon fiber reinforced nylon 6 polymer composites

“…The FTIR spectrum of nylon 6 matrix shows the transmittance peak corresponding to the ester group (C@O) at 1,762 cm 21 . The band at 1,614 cm 21 corresponds to amine (NAH) bending in nylon 6 matrix [37]. The bands at 2,954 and 2,883 cm 21 corresponds to CH 2 symmetric and CH 2 asymmetric stretching, respectively.…”

Effective Surface Functionalization of Carbon Fibers for Fiber/Polymer Composites with Tailor‐Made Interfaces

“…This method is based on the analysis of the electron energy emitted when the core electrons, which are excited by the irradiation of X-rays on the sample surface, go back to their ground state. [5] The specific surface area of the CFs influences the interfacial interaction between the CFs and a resin. The change in the energy levels of the molecular orbitals, which varies depending on the types of functional groups, is utilized to examine the surface functional groups.…”

“…By using Raman spectroscopy, it was confirmed that the I D /I G values can be controlled by the mechanochemical effect. [5] The specific surface area of the CFs influences the interfacial interaction between the CFs and a resin. The specific surface area is measured by the Brunauer-Emmett-Teller (BET) method using krypton gas.…”

“…We prepared a nylon/CF composite by a mechanochemical method [5][6][7] through a chemical reaction based on the high energy locally generated during the crushing of solid materials by a mechanical force such as friction or compression. There are only a few examples of the direct measurement/analysis of a chemical bond itself because it is difficult to identify which resin contributes to the interfacial bond.…”

“…A thermoplastic resin enables recycling of CFs by thermofusion processes that are strongly desired. If the interfacial interactions between the CFs and thermoplastic resins can be increased by chemical bonds, [5][6][7] thermoplastic resin-based CFRPs will be widely utilized, especially in fields familiar to our daily life such as the car industry. CF-based composite materials fabricated through various combinations have been developed and are known to show high formability, enabling mass production in areas such as the aerospace industry.…”