The effects of alkali treatment on the interfacial adhesion of bamboo fibres

Abstract

Abstract:In the present work, the potential of using bamboo fibres as reinforcement for polyester composites was evaluated. Two types of bamboo fibres were used: untreated and treated with different NaOH concentrations (1, 3, and 5 wt%). Mechanical properties of both treated and untreated fibres were investigated. In addition, single-fibre pull-out tests were performed to study the interfacial shear strength of the fibres with the polyester matrix at different embedment length of fibres. Scanning electron microscopy was used to study the surface morphology of the fibres before and after the tests. Results revealed that an untreated fibre has the best strength and stiffness but lowest strain at break. An increase in alkali concentration reduces the strain at failure and ductility of bamboo fibres. However, the strength and stiffness of the fibres were increased. In addition, the interfacial shear strength was improved with longer embedment length and higher NaOH concentration.

A review on the degradability of polymeric composites based on natural fibres

“…Voids are also present in fibres indicating a certain degree of porosity [18,26,27]. Higher degree of voids is found in fibres of plants living in wet habitats.…”

“…Lignin-hemicelluloses acts as matrix while microfibrils (made up of cellulose molecules) acts as fibres [10,17]. Other components include pectins, oil and waxes [17,18].…”

“…Waxes consist of different types of alcohols [17,20]. Wax and oil are substances on fibre surface used to protect fibre [18]. Important variables that determine overall properties of fibres are its structure, microfibrillar angle, cell dimensions, defects, and the chemical composition [10,17,18].…”

“…Wax and oil are substances on fibre surface used to protect fibre [18]. Important variables that determine overall properties of fibres are its structure, microfibrillar angle, cell dimensions, defects, and the chemical composition [10,17,18]. Microfibrillar angle is the angle between fibre axis and the microfibrils with a diameter of 10-30 nm.…”

Influence of peroxide modifications on the properties of cereal straw and natural rubber composites

“…As the natural fibers contain hydroxyl groups from cellulose and lignin, their surface needs to be modified with different chemical treatments to enhance the effectiveness of interfacial bonding (Ali et al 2016b;Militký and Jabbar 2015). Recently, mercerization, acrylation, acetylation as well as isocyanate, permanganate, silane and peroxide treatments of natural fibers have been adopted as successful improvement of fiber strength and reported in the literature (Li et al 2007;Kaushik et al 2013;Valadez-Gonzalez et al 1999;Ray et al 2002;Herrera-Franco and Valadez-Gonzá-lez 2005;Wong et al 2010).…”