Natural Fibre Modification and Its Influence on Fibre-matrix Interfacial Properties in Biocomposite Materials

S. O. Amiandamhen,M. Meincken,L. Tyhoda 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4

Biocomposite materials manufactured from natural fibres and polymer matrix represent a group of engineeredcomposite products with diverse applications. These materials continue to find increasing applications due to their designflexibility, superior properties and aesthetic appeal. The applicability of these biocomposites, however, depends on theinteraction in the fibre-matrix interface. This paper reviews the state of the art research in fibre-matrix interfacial interactionbased on published literature. A brief background on biocomposite materials is presented. The focus of this review is themodification of natural fibres and its effect on fibre-matrix interfacial adhesion and properties. In addition, the effect ofchemical treatment on fibre composition and fibre-matrix interfacial bonding mechanism are discussed.

Investigation of Thermal Conductivity of Natural Fibres Processed by Different Mechanical Methods

Rūta Stapulionienė,Saulius Vaitkus,Sigitas Vėjelis,Audronė Sankauskaitė 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.10

The article presents the results obtained during investigation of thermal conductivity at mean temperature of 10oC, macro- and microstructures of differently processed natural fibres. Natural fibres were processed into various types of fibres: long and short flax, long and short hemp, long and short combed flax, long and short combed hemp, chopped flax, chopped hemp, chopped peat. Samples of natural fibres with varying density from 39,6 kg/m3 to 102,5 kg/m3, thermal conductivity, respectively, varies from 0.0599 W/(m·K) to 0.0341 W/(m·K). Measurements of thermal conductivity were performed in conformity with requirements of EN 12667, EN 12939 by use of device Fox-304 (Laser Comp. USA). Macro- and microstructures investigations were carried out by optical and scanning electron microscopes. The empirical equations were suggested for determination of density of natural fibres. The paper describes the manufacturing possibilities with regard to thermal insulating materials based on natural fibres from easily renewable material resources provided by the agriculture.

Mechanical Properties and VOC Emission of Hemp Fibre Reinforced Polypropylene Composites: Natural Freezingmechanical Treatment and Interface Modification

Zhigang Li,Xinpei Wei,Junhui Liu,Hongjiang Han,Hongjie Jia,Jiawang Song 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4

In this study, the effects of natural freezing-mechanical treatment and interface modification on the mechanicalproperties and VOC emissions of hemp fibre-reinforced polypropylene composites were investigated. To evaluate theinfluence of natural freezing-mechanical treatment on fibres and composites, several tests were performed. Natural freezingmechanicaltreatment of HF enhanced the mechanical properties and reduced the VOC emissions of HF/PP compositescompared with untreated composites. After the degumming treatment, HF was treated with urea and KH-550, and themechanical properties of the modified composites were better than those of the unmodified composites. Compared with thetensile strength, flexural strength and impact strength of the unmodified composites, the mechanical properties of the ureamodifiedcomposites were enhanced by 16.45 %, 17.32 % and 13.23 %, respectively; the mechanical properties of thecomposites modified by the coupling agent KH-550 were increased by 19.53 %, 20.40 % and 11.19 %, respectively. The totalVOC emissions of modified HF/PP composites were lower than those of the unmodified composites. The obtained resultsdemonstrated that natural freezing-mechanical treatment is an effective fibre degumming method. Combined with interfacemodification, the composite has the characteristics of low VOC emissions, high strength, and good interface bonding.

Flexural Mechanical Properties of Natural Fibre Reinforced Polymer Composites - A Statistical Investigation

Benkhelladi Asma,Laouici Hamdi,Bouchoucha Ali,Mouadji Youcef 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10

The objectives and novelty of this paper are to create a hybrid-natural fibre composite by the Response SurfaceMethodology RMS technique, and then compared this hybrid composite with the individual fibre reinforced composites inthe bending test. The first aim of this study is devoted to analyse, modelize and optimise the various independent variablessuch as the type of fibres (X1), the types of chemical treatment (X2), the volume fraction of fibre (X3) and the treatmentduration (X4) used on the output parameters which are the mechanical characteristics namely, ultimate flexural stress andflexural modulus in the bending test using a Box-Behnken experimental design. Mathematical models for ultimate flexuralstrength and flexural modulus were developed using the response surface methodology (RSM). These models would behelpful in selecting independent variables in order to maximize the flexural mechanical properties. Statistical analysis of theresults showed that selected variables had a significant effect on the flexural properties, except the treatment time that has avery weak significance effect on the flexural properties. In the second section, the impact behaviors of the natural hybridcomposites found by the RMS method were confirmed experimentally. Finally, the experimental results indicate that theflexural properties of the natural hybrid composites increase with an increase in the composition of jute fibres.

Experimental investigation on thermal behavior, sound absorption, and flammability of natural fibre polymer composites

Ravi Kumar B.,Hariharan S.S. 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.5

Exhausting oil resources and increasing pollution around the world are forcing researchers to look for new, renewable, biodegradable materials to lead sustainable development. The use of fiber reinforced composites based on natural fibres has increasingly begun as prospective materials for various engineering applications in the automotive, rail, construction and aerospace industries. The natural fiber chosen to make the composite material is plant-based fibre, e.g. jute fibre, and hemp fibre. Thermosetting polymer based Epoxy (LY556) was utilized as matrix material and The composites were produced using hand lay-up technique. The fabricated composites were tested for acoustic testing, thermo-gravimetric analysis (TGA) and flammability testing to asses sound absorption, thermal decomposition and fire resistivity of the structures. Hemp fibre composites have shown improved thermal stability over Jute fibre composites. However, the fire resistance characteristics of jute fibre composites are better as compared to hemp fibre composites. The sound absorption coefficient of composites was found to enhance with the increase of frequency.

Materials Selection of Thermoplastic Matrices for ‘Green’ Natural Fibre Composites for Automotive Anti-Roll Bar with Particular Emphasis on the Environment

Mastura M. T.,Sapuan S. M.,Mansor M. R.,Nuraini A. A. 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.1

In this study, selection of thermoplastic polymers to be used in natural fibre-reinforced polymer composite is performed using Quality Function Deployment for Environment technique. The candidate materials for the matrix in composites are thermoplastic polyurethane, high-density polyethylene, low-density polyethylene, polystyrene and polypropylene and the selection process is carried out based on the design requirements of an automotive anti-roll bar. Requirements are collected through a study on the voice of customers and the voice of the environment. The approach is followed by sensitivity analysis using Expert Choice software based on the Analytic Hierarchy Process method. From the analysis, high-density polyethylene scored the highest (28.76%), and followed by thermoplastic polyurethane, which had 22.30%of the overall score. Finally, Young’s modulus of hemp fibre reinforced high-density polyethylene and thermoplastic polyurethane composites were compared, predicted using the Halpin-Tsai method. The results show that hemp-reinforced thermoplastic polyurethane composite shows higher Young’s modulus of 10.6 GPa, compared with hemp-reinforced high-density polyethylene composite (8.27 GPa). Based on these two analyses, thermoplastic polyurethane is selected as the most suitable polymer matrix for natural fibre composites for automotive anti-roll bar.

Fabrication and Characterization of Hybrid Natural Fibre-Reinforced Sandwich Composite Radar Wave Absorbing Structure for Stealth Radomes

V. Antony Vincent,C. Kailasanathan,G. Ramesh,T. Maridurai,V. R. Arun Prakash 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6

Natural fibre based sandwich composite wave absorbing structures were prepared and characterized for stealth and radome applications. The principal aim of this research was to develop a novel sandwich radar wave absorbing composite structure and evaluating their wave transmission and flexural properties. Fibres such as wool, silk, E-glass, aramid and wave absorbing foams like balsa wood, PVC and PMI were used for making wave absorbing sandwich composites. The composites were prepared using autoclave vacuum bag degassing method followed by post curing at 120 °C. The radar wave transmission characteristics were investigated using stealth radomes by partially replacing the traditional E-glass and aramid fi bre structure with a frequency selective surface (FSS) with standard parameters. The free space measurement technique was used to examine the radar wave transmission characteristics in the X-band frequency range (8.2–12.4 GHz). Three point bending test also performed to identify the fl exural strength of sandwich composite setup to ensure the bending rigidity. A highest wave transmission of 87.7% at bandwidth 0.83 GHz in − 1 dB with flexural strength of 44.2 MPa was observed for sandwich composite type 3c, which contains aramid/epoxy composite + balsa wood + silk/epoxy structure. The SEM micrographs showed highly reacted and toughness improved matrix phase for type 3c composite sandwich.

자연섬유복합재를 이용한 1㎾급 수평축 풍력 터빈 블레이드의 구조 설계 연구

박현범,공창덕,박길수,J. Lee 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11

본 연구에서 자연 섬유를 적용한 1㎾급 수평축 풍력 터빈 블레이드의 구조 설계 연구를 수행하였다. 기존의 유리섬유/에폭시 재질 적용 블레이드와 아마/에폭시 재질 적용 블레이드의 구조 설계 결과를 비교하였다. 블레이드의 구조 설계는 단순 설계 및 혼합 설계 기법를 적용하여 설계를 수행하였다. 설계된 블레이드의 구조적 안전성은 상용 유한요소프로그램인 MSC. NASTRAN을 사용하여 다양한 하중에 따라 선형 정적해석, 변형해석, 좌굴해석을 수행하였다. In this work, a structural design on 1㎾ class horizontal axis wind turbine blade using natural-fibre composite is performed. The structural design result of flax/epoxy composite blade is compared with the result of glass/epoxy composite blade. The structural design of the wind turbine blade is carried out using the simplified methods such as the netting rule and the rule of mixture. The structural safety of the designed blade structure is investigated through the various load cases, stress, deformation and buckling analyses using the commercial FEM code, MSC. NASTRAN.

Influence of Alkali and Silane Treatment on the Physico-Mechanical Properties of Grewia serrulata Fibres

JAIN, Bhupesh,MALLYA, Ravindra,NAYAK, Suhas Yeshwant,HECKADKA, Srinivas Shenoy,PRABHU, Shrinivasa,MAHESHA, G.T.,SANCHETI, Gaurav The Korean Society of Wood ScienceTechnology 2022 목재공학 Vol.50 No.5

Grewia serrulata fibres were chemically treated with 3%, 6%, and 9% NaOH for the duration of 4 h. Additionally, the NaOH-treated fibres were also treated with 3 - (trimethoxysilyl) propyl methacrylate (silane). Properties such as density and tensile strength of the treated fibres were compared against the untreated fibres. The highest density was obtained in the case of 9% NaOH + silane treated fibres, which was 26.47% higher than untreated fibres, implying effective removal of hemicellulose. Likewise, the highest tensile strength was also obtained in the case of 9% NaOH + silane treated fibres. The increment observed in the tensile strength of the natural fibres was related to the removal of impurities, hemicellulose, and stress-raisers as well as deposition over the fibre surface that smoothed it. These observations were further validated by estimating changes in chemical constituents due to chemical treatment along with characterization techniques such as scanning electron microscopy and thermogravimetric analysis.

Copying and Manipulating Nature: Innovation for Textile Materials

Rossbach, Volker,Patanathabutr, Pajaera,Wichitwechkarn, Jesdawan The Korean Fiber Society 2003 Fibers and polymers Vol.4 No.1

This paper considers the potential impact of biological approaches such as bio-copying (biomimetics) and biomanipulating (e.g. genetic engineering) on future developments in the field of textiles and, in particular, fibres. If analytical tools for studying biological systems combined with those of materials science are further developed, and higher efficiency and reproducibility of genetic engineering technology can be achieved, the potential for the copying and manipulation of nature for textile innovations will be immense. The present state for both fields is described with examples such as touch and close fastener, structurally coloured fibres, the Lotus of lect (for bio-copying), as well as herbicide tolerant cotton, insecticide resistant cotton (Bt cotton), cotton polyester bicomponent fibres, genetically engineered silkworm and silk protein, and spider fibres. (for genetic engineering).