Modification of deproteinized natural rubber via grafting polymerization with maleic anhydride |
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Authors: | Pinyo Wongthong Charoen Nakason Qinmin Pan Garry L Rempel Suda Kiatkamjornwong |
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Institution: | 1. Program of Petrochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand;2. Department of Rubber Technology and Polymer Science, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand;3. Green Polymer and Catalysis Technology Laboratory, Soochow University, Suzhou 215123, People’s Republic of China;4. Department of Chemical Engineering, Faculty of Engineering, University of Waterloo, Ontario N2L3G1, Canada;5. Academy of Science, the Royal Institute of Thailand, Sanam Sueapa, Dusit, Bangkok 10300, Thailand |
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Abstract: | Modification of natural rubber (NR) via grafting polymerization with maleic anhydride (MA) has received wide attention as it could improve the hydrophilicity of NR and extend its application to a wider application field. However, the grafting efficiency of MA onto NR in either the molten state or solution state is low and is accompanied with undesired high gel content in the grafts. In this work a novel technical route was developed in that a deproteinization operation was conducted before carrying out the grafting process and a differential microemulsion polymerization technique was applied for the grafting reaction. The effects of initiator and monomer concentration, reaction temperature, and reaction time on the grafting efficiency and gel fraction were investigated, and a comparison of the reaction performance was conducted for deproteinized NR (DPNR) and NR. The results indicated that the deproteinization operation could significantly improve the grafting efficiency and reduce the gel content, and a 29% yield of MA grafted onto the rubber backbone could be achieved at a condition of a DPNR:MA:initiator ratio of 85:9:6 (wt%) at 60 °C for 8 h. |
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Keywords: | Deproteinized natural rubber Maleic anhydride Graft copolymerization Differential microemulsion polymerization |
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