Eco-friendly sodium bicarbonate treatment and its effect on epoxy and polyester coir fibre composites

Published on Jun 30, 2019in Construction and Building Materials6.141
· DOI :10.1016/J.CONBUILDMAT.2019.03.284
Júlio C. Santos10
Estimated H-index: 10
(Citec),
Lívia Ávila de Oliveira3
Estimated H-index: 3
(Citec)
+ 3 AuthorsTúlio Hallak Panzera23
Estimated H-index: 23
(Citec)
Sources
Abstract
Abstract This work evaluates a new eco-friendly surface treatment method for coir fibres based on sodium bicarbonate (NaHCO3). The fibres are treated with 10 wt% NaHCO3 solution for different periods of time (24, 96 and 168 h). A 2141 Full Factorial Design is established to investigate the effect of the type of matrix (epoxy and polyester) and treatment time (24, 96 and 168 h) on the mechanical properties of coir fibre composites. X-Ray diffraction (XRD) analysis reveals that the treatment does not promote a complete change of cellulose-I into cellulose-II. However, the degradation of hemicellulose and pectin of the fibre surface is evidenced by the thermogravimetric (TGA) curves. The chemical treatment contributes to increase the fibre density and to reduce its thermal stability. Single fibre tensile tests reveal a gradual increase in the elastic modulus attributed to the treatment time factor. Epoxy composites presented higher tensile and flexural strength in comparison to polyester composites, which exhibit higher tensile and flexural modulus. The alkaline treatment does not affect the mechanical strength of the composites. However, higher tensile and flexural moduli are obtained when the treatment time increases to 96 or 168 h. The proposed treatment proves to be feasible and efficient to increase the stiffness of coir fibre composites, besides being less damaging to the environment after disposal when compared to strongly alkaline solutions such as NaOH.
📖 Papers frequently viewed together
1 Author (Huang Gu)
2014
1 Author (B Haridas)
References57
Newest
This research endeavor explores the effect of economical and environment-friendly treatment of sisal fibers, prior to their incorporation into poly-lactic acid (PLA). Biocomposites incorporating sisal fibers (30% [w:w]) treated with sodium bicarbonate (10% [w:v]) aqueous solution for varying time periods (24, 72, 120, and 168 h) were developed using extrusion-injection molding process. Thermogravimetric analysis, morphological examination, Fourier-transform infrared spectroscopy, and lignocellul...
Source
#1Hamed Yazdani Nezhad (Cranfield University)H-Index: 13
#2Vijay Kumar Thakur (Cranfield University)H-Index: 83
Mechanical failure in epoxy polymer and composites leads them to commonly be referred to as inherently brittle due to the presence of polymerization-induced microcrack and microvoids, which are barriers to high-performance applications, e.g., in aerospace structures. Numerous studies have been carried out on epoxy’s strengthening and toughening via nanomaterial reinforcement, e.g., using rubber nanoparticles in the epoxy matrix of new composite aircraft. However, extremely cautious process and f...
Source
#1Júlio C. SantosH-Index: 10
Last. Túlio Hallak PanzeraH-Index: 23
view all 6 authors...
Abstract Surface modification induced by sodium carbonate on coir fibres was studied in view of its application as a reinforcing agent in polyester and epoxy polymer fibre-reinforced composites. Coir fibres were treated with a 10 wt% sodium carbonate solution for different periods of time (24, 96 and 168 h) at room temperature. The surface treatment was evaluated by scanning electron microscopy, X-ray diffraction and thermogravimetric analysis. Tensile, flexural and impact properties of treated ...
Source
#2Júlio C. SantosH-Index: 10
Last. Fabrizio ScarpaH-Index: 69
view all 6 authors...
Abstract A full factorial design (2 2 3 1 ) has been used to investigate the effect of the use of sodium hydroxide fibre treatment, Portland cement and uniaxial pressure on the physical and mechanical properties of hybrid short coir fibre reinforced composites (HSCoirFRCs). The response variables considered in this work were the apparent density, porosity, tensile and flexural strength, the modulus of elasticity and the Charpy impact resistance. The alkali treatment contributed not only to reduc...
Source
#1Manickam RameshH-Index: 19
#2K. PalanikumarH-Index: 47
Last. K. Hemachandra Reddy (Jawaharlal Nehru Technological University, Hyderabad)H-Index: 21
view all 3 authors...
The abundant availability and accessibility of plant fibres are the major reasons for an emerging new interest in sustainable technology. While focusing on the composite materials, the main points to be considered are environment friendliness and light weight, with high specific properties. This century has witnessed remarkable achievements in green technology in the field of materials science through the development of high-performance materials made from natural resources is increasing worldwi...
Source
#1Hong ChenH-Index: 7
#2Yan YuH-Index: 1
Last. Fei BenhuaH-Index: 2
view all 7 authors...
The aim of this study was to study the microstructure and mechanical properties of individual bamboo fibers after alkali treatment. The individual bamboo fibers were treated by sodium hydroxide (NaOH) solution with varying concentration (6, 8, 10, 15 and 25%) followed by rinsing and freeze-drying treatments. The alkali treated individual bamboo fibers were subsequently characterized by scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray diffracti...
Source
#1Libo Yan (Braunschweig University of Technology)H-Index: 28
#2Nawawi Chouw (University of Auckland)H-Index: 32
Last. Bohumil Kasal (Braunschweig University of Technology)H-Index: 21
view all 4 authors...
Abstract In this study, coir fibres were studied for use as reinforcement materials for polymer and cementitious composites. The effect of fibre treatment (i.e. 5 wt.% NaOH solution at 20 °C for 30 min) on microstructure and mechanical properties of coir fibre, coir fibre reinforced epoxy (CFRE) and coir fibre reinforced cementitious (CFRC) composites were investigated. Scanning electronic microscope (SEM) studies were carried out to examine the microstructures of untreated and treated coir fibr...
Source
#1Kim L. Pickering (University of Waikato)H-Index: 40
#2M.G. Aruan Efendy (University of Waikato)H-Index: 5
Last. Tan Minh Le (University of Waikato)H-Index: 4
view all 3 authors...
Abstract Recently, there has been a rapid growth in research and innovation in the natural fibre composite (NFC) area. Interest is warranted due to the advantages of these materials compared to others, such as synthetic fibre composites, including low environmental impact and low cost and support their potential across a wide range of applications. Much effort has gone into increasing their mechanical performance to extend the capabilities and applications of this group of materials. This review...
Source
#1Vincenzo Fiore (University of Palermo)H-Index: 27
#2T. Scalici (University of Palermo)H-Index: 19
Last. Antonino Valenza (University of Palermo)H-Index: 35
view all 6 authors...
Abstract Several researchers have shown how sisal fibres possess remarkable tensile properties that yield them good candidates as reinforcement in biocomposite materials. This work aims to evaluate the effect of an eco-friendly and cost effective surface treatment method based on the use of commercial sodium bicarbonate (i.e. baking soda) on properties of sisal fibre and its epoxy composites. In particular, raw sisal fibres were treated with a 10%w/w of sodium bicarbonate solution for different ...
Source
#1Chen Wang (Lboro: Loughborough University)H-Index: 39
#2Xianbai JiH-Index: 7
Last. Zhong Chen (NTU: Nanyang Technological University)H-Index: 94
view all 5 authors...
Abstract Textile-reinforced composites have become increasingly attractive as protection materials for various applications, including sports. In such applications it is crucial to maintain both strong adhesion at fibre–matrix interface and high interfacial fracture toughness, which influence mechanical performance of composites as well as their energy-absorption capacity. Surface treatment of reinforcing fibres has been widely used to achieve satisfactory fibre–matrix adhesion. However, most st...
Source
Cited By27
Newest
#2P. K. JayasreeH-Index: 4
view all 3 authors...
Source
#1K. Raja (K. S. Rangasamy College of Technology)H-Index: 2
#2P. SenthilkumarH-Index: 13
Last. T. Natarajan (College of Engineering and Management, Kolaghat)H-Index: 1
view all 4 authors...
ABSTRACTGreen material consciousness has enthused to introduce natural fiber alternative to man-made fiber as reinforcement in polymer composites. The presence of surface impurities and non-cellulo...
Source
Source
#1Joshua O. Ighalo (University of Ilorin)H-Index: 21
#2Comfort Abidemi Adeyanju (University of Ilorin)H-Index: 5
Last. Sulyman A. Abdulkareem (University of Ilorin)H-Index: 7
view all 5 authors...
The aim of this paper was to review the recent advances in treatment strategies for natural fibers before their utilization in a reinforced composite in the last 5 years. More focus was placed on e...
Source
#1Anand Kumar Mehra (Jabalpur Engineering College)
#2Ruchika Saini (Jabalpur Engineering College)
Last. Abhishek Kumar (Jabalpur Engineering College)H-Index: 1
view all 3 authors...
Abstract The present investigation deals with matured sponge gourd which has been amalgamated with coconut coir as reinforcement along with epoxy resin as matrix in a composite. This study has been carried out to explore the impact of change in weight percentages of sponge gourd fiber and coir on the mechanical properties and moisture affinity. The experiments revealed that the tensile and impact strength increases with coir addition, whereas, flexural strength increases with sponge fiber conten...
Source
Source
#1Vivek Mishra (Indore Institute of Science & Technology)H-Index: 3
#2Alok Agrawal (Sagar Institute of Research & Technology)H-Index: 21
Source
The effect of different frequencies on the glass-transition temperature, storage and loss moduli, and damping of untreated and sodium bicarbonate-treated sisal fibers reinforced biocomposites have been analyzed in the temperature range of 30-160°C. In addition, tensile and flexural properties of these composites were also studied as per ASTM standards. On the basis of the results obtained, it is concluded that the treated biocomposites can be used in automobile, packaging, and electronics applic...
Source
#1Vincenzo FioreH-Index: 27
#2D. BadagliaccoH-Index: 4
Last. Antonino ValenzaH-Index: 35
view all 5 authors...
The goal of this paper is to evaluate the effectiveness of a cost-effective and eco-friendly treatment based on the use of sodium citrate (Na3C6H5O7) on the mechanical properties of flax fiber reinforced composites. To this scope, flax fibers were soaked in mildly alkaline solutions of the sodium salt at different weight concentration (i.e., 5%, 10% and 20%) for 120 h at 25 °C. The modifications on fibers surface induced by the proposed treatment were evaluated through Fourier transform infrared...
Source
#1Rodrigo Teixeira Santos Freire (UFSJ: Universidade Federal de São João del-Rei)H-Index: 10
#2J.C. dos Santos (UFSJ: Universidade Federal de São João del-Rei)
Last. LJ da Silva (UFSJ: Universidade Federal de São João del-Rei)
view all 4 authors...
Abstract Hybrid composites present unique features that meet various design requirements more efficiently and more economically than conventional composites, offering advantages such as high strength and stiffness, increased fatigue and impact resistance, among others. Ever-increasing demands for sustainability and ecologically friendly products have considerably amplified the academic and industrial interest in natural fibers in the last decades. Natural fibers, owing to their intrinsic low den...
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.