राष्ट्रीय प्रौद्योगिकी संस्थान राउरकेला
National Institute of Technology Rourkela

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Seminar Title
::
Macromolecular structure of Sunn Hemp fiber and its potential application
Seminar Type
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Progress Seminar
Department
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Physics and Astronomy
Speaker Type
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Student
Speaker Name
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Chinmayee Dash (516PH1004)
Date  &  Time
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23 Oct 2018  10 AM
Venu
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Seminar Hall (MC-217) Ist Floor
Contact
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D.K. Bisoyi, dkbisoyi@nitrkl.ac.in, Contact no - +91 661 2462722
Abstract
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Introduction of Natural fibers (NF) in making of composite material has been proved as a replacing materials over conventional fibers (carbon/glass) as it offer equivalent strength, stiffness, toughness, good fatigue and corrosion properties like them. In present study, Hemp (Crotalaria juncea) reinforced polymer composite have been developed by hand-lay out technique. Initially dry raw sunn hemp (RSH) fiber reinforced epoxy composite were prepared with different fiber loading (5, 10, 15, 20 and 25 vol %). The effect of loading on mechanical property was investigated. Sufficient mechanical strength was observed for the composites loaded with 20vol% fiber which was optimized for all composite fabrication for further mechanical studies. To enhance the compatibility between hydrophilic RSH fiber and hydrophobic epoxy resin, the surface of RSH fiber was modified by means of chemical pretreatment (dewaxing and alkali). The effect of treatment on cellulose crystallinity, fiber morphology and functional group of fiber were studied. In addition that, the treatment effect on mechanical property was also investigated. Degree of cellulose crystallinity of treated fiber was enhanced suggesting the rearrangement of amorphous polymer chain in the fiber structure. Rough surface with fiber disintegration were revealed from treated fiber’s surface morphology which explained the removal of unwanted surface impurities with non-cellulosic components from fiber. Increment in cellulose crystallinity and roughness on fiber by pretreatment made a strong interlocking between fiber/matrix at interface which in turn boosted the mechanical strength of composites.
 
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