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- 저자 : Urmilla Baruah (검색결과 1 건)
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Polyolefin Based Copolymers as Matrix Component in Coir Fiber Reinforced Composites
Maitrayee Saikia,Nilakshi Kakati,Urmilla Baruah,Lachit Phukan,Prakash J. Saikia,Shashi D. Baruah 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9
Natural fiber reinforced polymer composites have attracted much attention in global market as they possess muchadvantageous characteristics over conventional composite materials in terms of eco-friendliness, light weight, low cost, goodmechanical properties and biodegradability. Among natural fibers, the surface properties of coir fiber can be easily improvedwhen the fiber is reinforced with polymer matrix. Therefore, the aim of the present investigation is to develop a coir fibercomposite reinforced with polyolefin based copolymers (PCs) and investigate the influence of coir fiber loading onmechanical as well as on water absorption behavior of the composites. Three types of PCs were synthesized using differentcontrolled radical polymerizations (CRP) techniques and used as matrix in composite preparation. Poly(ethylene-co-butylmethacrylate) synthesized via dual concurrent atom transfer radical polymerization (ATRP)-reversible addition fragmentationchain transfer (RAFT) polymerization as well as RAFT mediated miniemulsion polymerization and poly(1-octene-co-butylmethacrylate) synthesized via RAFT polymerization were used as matrix component to prepare the composite materials. Theperformance evaluation of these PCs in the prepared composites was also compared. The composites were prepared usingcompression moulding method by reinforcing with 65, 70, 75 and 80 wt. % coirfiber loading. Analysis by universal testingmachine (UTM) showed that the tensile strength and flexural strength of composites were decreased with increase in the fiberloading. Highest tensile as well as flexural strength was observed for 65 wt. % coir fiber loading. Among the three types ofPCs matrixes, poly(ethylene-co-butyl mehacrylate) synthesized by RAFT mediated miniemulsion polymerization showedhighest tensile and flexural strengths in the prepared composite. PCs reinforced coir fiber composites showed the potentialadvantage over coir fiber composites with commercial Araldite 506 resin as matrix component in terms of tensile as well asflexural properties. The morphological study by scanning electron microscopy (SEM) analysis confirmed the good adhesionbetween the PCs matrixes and the coir fibers in the prepared composites. X-ray photoelectron spectroscopy (XPS) analysisdemonstrated significant changes occurred on the surface of coir fiber due to reinforcement of PCs matrixes and X-raydiffraction studies showed the amorphous natures of the composites without any crystallinity. Thermogravimetric analysisresults revealed that due to penetration of PCs matrix into the coir fiber, the thermal stability of composites were significantlyincreased. Furthermore, water absorption properties of composites were also investigated. Based on these results thesynthesized PCs/coir composite materials are found to be suitable for its use as hardboards and in different householdfurniture materials.
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