Mechanical properties of wood–fiber reinforced polypropylene composites: Effect of a novel compatibilizer with isocyanate functional group |
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| Affiliation: | 1. Institute of Wood Science and Technology, Malleswaram, Bangalore 560 003, India;2. Department of Chemical Engineering, Indian Institute of Science, Bangalore 560 012, India;1. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China;2. Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan;3. Graduate School of Science and Technology, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan;4. School of Chemical Sciences, The University of Auckland, Auckland 1142, New Zealand;1. C2MA, Ecole des Mines d’Alès, 6 Avenue de Clavières, 30319 Alès Cedex, France;2. LIMATB, Université de Bretagne Sud, Rue de Saint Maudé, 56321 Lorient Cedex, France;1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China;2. University of Sciences and Technology of China, Hefei, 230026, PR China;1. Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, Harbin, 150040, PR China;2. College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, PR China;1. Department of Agricultural and Biosystems Engineering, North Dakota State University, 1221 Albrecht Boulevard, Fargo, ND 58102, USA;2. Department of Mechanical Engineering, North Dakota State University, 111 Dolve Hall, Fargo, ND 58102, USA |
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| Abstract: | Natural fibers are increasingly being used as reinforcement in commercial thermoplastics due to their low cost, high specific properties and renewable nature. While the maleic anhydride modified polypropylene (MAPP) is most commonly used as compatibilizer to improve interfacial adhesion between hydrophilic wood–fibers and hydrophobic polypropylene, in this study, a novel compatibilizer (m-TMI-g-PP) with isocyanate functional group was synthesized by grafting m-isopropenyl-α,α-dimethylbenzyl-isocyanate (m-TMI) onto isotactic polypropylene (PP) in a twin screw extruder. The effect of filler concentration on the mechanical properties of wood–fiber filled composites, prepared by using m-TMI-g-PP as the compatibilizer, was investigated. The addition of the compatibilizer resulted in greater reinforcement of composites, as indicated by the improvement in mechanical properties. Tensile strength of composites so prepared increased by almost 45%, whereas 85% increase in flexural properties was observed. However the addition of wood–fibers resulted in a decrease in elongation at break and impact strength of the composites. |
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