High residual mechanical properties at elevated temperatures of bamboo/glass reinforced‐polybenzoxazine hybrid composite

Abstract

We successfully added bamboo and glass fibers into bisphenol A-aniline based benzoxazine (BA-a) resin by hotpressing method. In order to improve the interfacial adhesion between bamboo fibers and the matrix, bamboo fibers were pretreated in 6 wt% NaOH solutions for 12 h. The results showed alkali-treatment had a positive effect on mechanical properties of the composites at both room and elevated temperatures (60 C, 110 C, 160 C, and 210 C). Due to the incorporation of glass fibers, the bamboo/glass reinforcedpolybenzoxazine hybrid composites exhibited highest strength and modulus among all samples and had high residual mechanical properties at elevated temperatures (residual mechanical properties refers to the ratio of strength and modulus of the composites at elevated temperatures to that measured at room temperature). The fractured surface morphologies of the composites were observed by scanning electron microscope. The results showed with the increase of temperature, the debonding and fiber pull-out became apparent, and the matrix softening could be clearly observed at 210 C. In addition, thermal and thermomechanical properties of neat benzoxazine and the composites were also investigated through thermogravimetric analysis and dynamic mechanical analyzer, respectively.

Synthesis and Characterization of Low-Cost Cresol-Based Benzoxazine Resins as Potential Binders in Abrasive Composites

“…Composites with bisphenol-A-aniline benzoxazine matrix reinforced with silane-modified PIPD/basalt hybrid fibers resulted in a significant improvement of mechanical properties with good interfacial adhesion [ 27 ]. There are also reports regarding high thermally and mechanically stable hot-pressed bamboo/glass-reinforced polybenzoxazine hybrid composites which maintain good mechanical performance at elevated temperature [ 28 ]. The fact that application of carbon fiber as a reinforcing material for polybenzoxazine matrix using proper manufacturing process allows one to obtain modern, extremely durable composites that can be successfully implemented in highly demanding aerospace applications is also worth noticing [ 29 ].…”

Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings

“…At present, natural plant fibers are mainly used for fabricating some nonstructural or semistructural composites [9]. This is because natural fiber/polymer composites tend to exhibit obviously lower strength and stiffness than synthetic fibers [10][11][12]. Especially for short-discontinuous natural fibers, some researchers claimed that these chopped natural fibers could merely be used as fillers in the polymer matrices because they did not provide remarkable reinforcements to polymer composites [13,14].…”

Facile Preparation of All Cellulose Self-reinforced Nanocomposites from Bamboo Shoot Fibers

“…Cellulose nano bers with outstanding characteristics such as high speci c surface area and excellent tolerance, good mechanical properties, high resistance performance and low thermal expansion coe cient have aroused great interest in composite materials and all cellulose nanocomposites (ACC) (Li, Yan, Cai 2019;Abdul et al 2014), which are often used in many applications, from aerospace industry to civil engineering and building applications (Zhang et al 2019;Yu et al 2018). Nishino et al (2004) proposed the de nition of all cellulose composites (ACC).…”