Friction and Wear Behavior of Polyimide Composites Reinforced by Surface-Modified Poly-p-Phenylenebenzobisoxazole (PBO) Fibers in High Ambient Temperatures

Abstract

(1) In order to improve the properties of antifriction and wear resistance of polyimide (PI) composite under high temperature conditions, (2) 3-Aminopropyltriethoxysilane (APTES) and Lanthanum (La) salt modifications were employed to manufacture poly-p-phenylenebenzobisoxazole (PBO)/PI composites with different interface properties. The representative ambient temperatures of 130 and 260 °C were chosen to study the friction and wear behavior of composites with different interface properties. (3) Results revealed that while both modification methods can improve the chemical activity of the surface of PBO fibers, the La salt modification is more effective. The friction coefficient of all composites decreases with the increase of sliding velocity and load at two temperatures, and the specific wear rate is increases. Contrary to the situation in the 130 °C environment, the wear resistance of the unmodified composite in the 260 °C environment is greatly affected by the sliding velocity and load, while the modified composites are less affected. Under the same test parameters, the PBO–La/PI composite has the lowest specific wear rate and friction coefficient, and (4) La salt modification is a more effective approach to improve the properties of antifriction and wear resistance of PI composite than APTES modification in high ambient temperatures.

High Performance Polymer Composites: A Role of Transfer Films in Ensuring Tribological Properties—A Review

“…When designing PI-based composites for high-temperature applications, 3-APTES and its modification with lanthanum (La) salt can be used for improving the interface properties. As an example, Yu, L., et al investigated ‘PI + poly-p-phenylenebenzobisoxazole (PBO)’ samples [ 40 ]. They reported that the PBO fiber surface modification with La salt was the most efficient.…”

Effects of Non-Conventional Sterilisation Methods on PBO-Reinforced PVA Hydrogels for Cartilage Replacement

“…1085 cm −1 to C-O-C, i.e., C-O in secondary alcohols, such as those typical of PVA structures [ 17 , 38 ]. The region between 1700 and 1500 cm −1 exhibits peaks typically attributed to the stretching of C-C bonds and the covalent double bonds C=N and C=C from PBO, and the C=O present in PVA [ 20 , 39 ]. The most significant difference was the higher intensity of the peaks within the region 1700–1500 cm −1 for MW-3 samples, compared to non-sterilised ones.…”

“…These authors found an increase in the C=O and C=C peak intensity after 3 min irradiation at 200 W and hypothesized that microwaves led to side chain scission, enhancing the subsequent bonds between the polymer chains, i.e., the formation of a more cross-linked structure. At lower wavenumbers, but above 1300 cm −1 , several peaks were identified, corresponding to C-N stretching of PBO and CH 2 bending of PVA, while the peak at 704 cm −1 was ascribed to the C-H bending of PBO [ 39 ].…”

High-Performance Dental Composites Based on Hierarchical Reinforcements

“…By modifying high-performance fibers with these nanomaterials, hierarchical reinforcement with micro/nanostructures can be achieved, by which the interface bonding between fibers and the resin can be enhanced significantly. Nevertheless, studies have been limited to industrial fields, and those resin matrices are primarily industrial heat-cured resins, for example, epoxy resin (Wu et al 2020), polyimide (Yu et al 2019), or phenolic resin (Bian et al 2014). Few studies have focused on using hierarchical reinforcement to improve the interface between dental light-curable resins and high-performance fibers.…”

“…In addition, most of those studies concentrated only on evaluation of the interface performance at the microscopic level (Wu et al 2020). Few studies have investigated the effects of modification at the macroscopic level and focused on industrially relevant properties, for example, antifriction (Yu et al 2019), ultraviolet resistance (Shao et al 2021), and resistance to aging (Chen et al 2017). Less attention has been paid to flexural performance or biological safety.…”