Improvement of Interfacial Shear Strength of Mendong Fiber (Fimbristylis globulosa) Reinforced Epoxy Composite Using the AC Electric Fields

Abstract

The effects of the AC electric field treatment on the interfacial shear strength of mendong fiber-reinforced epoxy composites were investigated. For this purpose, the epoxy (DGEBA) with a cycloaliphatic amine curing agent was treated by the AC electric field during the curing process. The heat generated during the epoxy polymerization process was monitored. Structure of the epoxy was studied by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and Scanning Electron Microscope, respectively. The interfacial shear strength (IFSS) was also measured using a single fiber pull-out test. XRD analyzes indicated that the treatment of AC electric fields was able to form a crystalline phase of epoxy. IFSS of the mendong fiber-reinforced epoxy composites was optimum increased by 38% in the AC electric fields treatment of 750 V/cm.

The effect of the electric fields on crystalline structure and functional group of mendong fiber (Fimbristylis globulosa)

“…The chemical content of the the fiber are 20.2% hemicellulose, 72.14% cellulose, 3.44% lignin, and 4.2% extractive matter and tensile strength, modulus of the fiber, and the crystalline content is about 452 MPa, 17 GPa [7], and 70,4% [12], respectively. This fiber had good property as reinforcement in polymer composite [13].…”

“…Physical treatment like electric current, electric fields and electromagnetic fields cause an increase in the impact strength of carbon fiber composite polymer [14], interfacial shear strength of composite natural fiber [13], and the bending stiffness of the reinforced carbon composite plate [15]. However, the presence of DC electric field is very high in the composite glass/epoxy cause of aging that causes delamination and debonding between the glass fiber and epoxy matrix [16].…”

Critical Fiber Length of Mendong Fiber in Epoxy Matrix Composite

“…The single fiber pull-out test was conducted for determining the interfacial shear strength of mendong fiber in the epoxy matrix, refer to Suryanto methods [9]. Pull-out tests conducted for ten specimens in a fiber tensile test device with maximum force 5 N, 1 mN resolution and a tension speed of 3.5 mm/min at room temperature.…”

Dynamic Cure Kinetics and Physical-Mechanical Properties of PEG/Nanosilica/Epoxy Composites

“…Because of their excellent thermal and mechanical properties, epoxy (EP) resins are widely used in structural adhesives [1], insulating materials [2], resin matrices for high performance composites [3], protective coatings [4], electronic and electronical components [5,6], etc. These wide applications are due to creep resistance [7], excellent adhesion to many substrates [8], high temperature performance [9], high stiffness [10], and high mechanical and electrical properties [11]. However, almost all EPs are brittle [12][13][14].…”