[2021-Vol.18-Issue 6]Flexural and Dynamic Mechanical Properties of Alkali-Treated Coir/Pineapple Leaf Fibres Reinforced Polylactic Acid Hybrid Biocomposites
Post: 2021-12-23 14:00  View:448

Journal of Bionic Engineering (2021) 18:1430–1438 

Flexural and Dynamic Mechanical Properties of Alkali-Treated Coir/ Pineapple Leaf Fibres Reinforced Polylactic Acid Hybrid Biocomposites 

Ramengmawii Siakeng1,2 · Mohammad Jawaid2  · Mohammad Asim2  · Hassan Fouad3  · Sameer Awad4  · Naheed Saba2  · Suchart Siengchin1 

1 Department of Mechanical and Process Engineering, The Sirindhorn International Thai-German, Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
2 Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
3 Applied Medical Science Department, Community College, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia
4 Chemistry, School of Science and Technology, University of New England, Armidale, NSW 2351, Australia

AbstractPolylactic acid (PLA) possesses good mechanical and biodegradability properties which make it a suitable material for polymer composites whereas brittleness and high costs limit its utilization in various applications. The reinforcement of natural fbres with biopolymers has been formed to be an efcient technique to develop composites having the ability to be fully biodegradable. This study concerns with the incorporation of various percentages of untreated and alkali-treated Coir Fibres (CF) and pineapple leaf fbres (PALF) in PLA biocomposites and characterizations of fexural, morphological and dynamic mechanical properties. Flexural properties showed that the treated C1P1 hybrid composites (C1P1A) displayed highest fexural strength (35.81 MPa) and modulus (5.28 GPa) among all hybrid biocomposites. Scanning Electron Microscopy (SEM) revealed a behaviour of fbre-matrix adhesion in untreated treated biocomposites. SEM observation revealed good dispersion of the fllers in PLA. Dynamic mechanical analysis revealed that C1P1A showed highest glass transition temperature (Tg) and storage modulus (E′) while untreated C3P7 displayed the least Tg and E?. Overall fndings showed that alkali-treated hybrid biocomposites (CF/PALF/PLA) especially C1P1A have improved fexural properties, dynamic and morphological properties over untreated biocomposites. Success of these fndings will provide attracting consideration of these hybrid biocomposites for various lightweight uses in a broad selection of industrial applications such as biomedical sectors, automobile, construction, electronics equipment, and hardware tools. 

Keywords Coir fbres · Pineapple leaf fbres · Biocomposites · Polylactic acid · Mechanical properties · Dynamic mechanical properties


SEM micrographs of fractured surface of flexural samples for untreated and treated CF/PALF/PLA hybrid biocomposites: a untreated C7P3, b treated C7P3, c untreated C1P1, d treated C1P1, e untreated C3P7, and f treated C3P7

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