Effect of ammonium polyphosphate on flame retardancy,thermal stability and mechanical properties of alkali treated kenaf fiber filled PLA biocomposites |
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| Affiliation: | 1. Dept. of Civil and Environmental Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223, USA;2. Dept. of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA;3. Dept. of Electrical and Computer Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223, USA;4. Dept. of Engineering Technology, University of North Carolina at Charlotte, Charlotte, NC 28223, USA;1. School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, PR China;2. Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing 100048, PR China;3. School of Materials, Beijing Institute of Technology, Beijing 100081, PR China;1. New Materials Research Institute, University of Nottingham Ningbo China (UNNC), Ningbo, 315100, PR China;2. Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia, Jalan Broga 43500 Semenyih, Selangor, Malaysia;3. National Key Laboratory of Advanced Composites, AVIC Composite Technology Center, Beijing, 101300, PR China;4. School of Engineering and Mathematical Sciences, La Trobe University, Bendigo, Victoria, 3552, Australia |
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| Abstract: | In present research polylactic acid (PLA) biocomposites were prepared from PLA and kenaf fiber using dry blending, twin screw extrusion and compression molding techniques. PLA was blended with kenaf core fiber, polyethylene glycol (PEG) and ammonium polyphosphate (APP). Kenaf fiber was treated with 3%, 6% and 9% NaOH solution separately. Both raw and treated kenaf along with 10, 15 and 20 phr APP was utilized during composite preparation. The effects of APP content and alkali treatment on flammability, thermal and mechanical properties of kenaf fiber filled PLA biocomposites were investigated. APP is shown to be very effective in improving flame retardancy properties according to limiting oxygen index measurement due to increased char residue at high temperatures. However addition of APP decreased the compatibility between PLA and kenaf fiber, resulting in significant reduction of the mechanical properties of PLA biocomposites. Thermogravimetric analysis (TGA) showed that NaOH treatment improved the thermal stability of PLA biocomposites and decreased carbonaceous char formation. |
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| Keywords: | Ammonium polyphosphate Alkali treatment Kenaf fiber Polylactic acid Biocomposite |
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