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035 _a.b1215538x
099 9 _aAIT Thesis no.FB-10-32
100 0 _aPaweena Saenghirunwattana
245 1 0 _aImproving the performance of biocomposites (PLA-soy protein) reinforced with corn husk fiber
260 _aPathum Thani, Thailand :
_bAsian Institute of Technology,
_c2010
300 _a118 p. :
_bill. (some col.) +
_e1 online resource
490 1 _aThesis ;
_vno. no.FB-10-32
500 _aA thesis submitted in partial fulfillment of the requirement for the Degree of Master Engineering, School of Environment, Resources and Development
502 _aThesis (M.Eng.) - Asian Institute of Technology, 2010
520 _aIn this study, the alkali treatment was used to extract fiber bundles from corn husk. Biocomposites from soy protein and polylactic acid reinforced with corn husk fiber before and after alkali was prepared and the properties of performance were investigated. SEM obsevations on the morphological structure of untreated corn husk fiber showed the thick outer layer of non-cellulosic substances on the surface of fiber. The mechanical properties of PLA {u2013}soy based biocomposites reinforced with corn husk fiber after extraction was superior to the untreated fiber. Optimum condition for extracted corn husk fiber was 1% w/w of NaOH solution at 70°C for 2h of reaction because this condition showed the maximum increased the value of all mechanical properties. The maximum value of tensile, flexural and impact strength are 13.67 MPa, 27.23 MPa and 1.59 kJ/m2, respectively after improvement. The effect of PLA {u2013}Soy protein based biocomposites reinforced with corn husk fiber before and after fiber surface modification was prepared for investigation the mechanical and water absorption properties. Silane treatment and potassium permanganate treatment were used for fiber surface modifications. These agents were improved the mechanical and reduce the hydrophilicity of natural fiber. SEM obsevations on the morphological structure of corn husk fiber showed that chemical agents can be removed impurities substances such as hemicellulose and lignin after surface modification. The experimental result showed that fiber after surface modification was significantly improving the mechanical and water absorption properties because the agents made a strong interfacial between fiber and matrix. Similarity, SEM observations on the tensile fracture surface of biocomposites showed that the surface modification of the fiber occurred and improved fiber{u2013}matrix adhesion. Regarding the mechanical properties of biocomposites, it was observed that the PLA-Soy protein based biocomposites with 1.5% silane solution treated corn husk fiber showed maximum improvement when compared with the other treatments. Furthermore, the optimum in mechanical properties can be obtained at fiber content of 5wt%which exhibit an obvious enhancement in strength and modulus compared to the other fiber contents. Approximately 53% improvement in tensile strength, 124% in tensile modulus, 86% in flexural strength, 126% in flexural modulus, 37% in impact strength and 11% in water absorption had been found, respectively when compared with untreated corn husk fibers. Additional, water sorption kinetics in 1.5% silane treated corn husk fiber reinforced PLA-Soy protein based biocomposites was investigated. Water sorption at four different temperatures was analysed and compared. The saturation of soaking time was shortened when the temperature of immersion was increased because of higher rate of diffusion. Higher diffusion coefficients, sorption coefficient and permeability coefficient values were observed at 70°C whereas lower diffusion coefficients, sorption coefficient and permeability coefficient values were observed at 4°C.
650 4 _aCorn husk
650 0 _aComposite materials
700 0 _aAthapol Noomhorm,
_eChairperson
700 1 _aRakshit, Sudip Kumar,
_eExamination Committee
700 1 _aAnal, Anil Kumar,
_eExamination Committee
700 0 _aVilai Rungsardthong,
_eExamination committee
710 2 _aRTG Fellowships,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. no.FB-10-32
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B02783
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_tAbstract--AIT Thesis no.FB-10-32
_vn
945 _lmnait
945 _lmnait
942 _c20
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