Graft Copolymerization of Vinyltriethoxysilane Onto Deproteinized Natural Rubber
Main Article Content
Abstract
In this work, graft copolymerization of vinyltriethoxysilane (VTES) onto deproteinized natural rubber (DPNR) was carried out to prepare in situ nanosilica reinforced natural rubber. Graft copolymerization of VTES onto DPNR was performed in latex stage with TBHP/TEPA as initiators with initiator concentrations of 0.033, 0.066 mol/kg-rubber and monomer concentrations of 1.05, 1.5 and 2.0 mol/kg-rubber. VTES conversion is derived from silica content which is determined by burning method. The graft copolymers were characterized by FT-IR and TEM. It was found that VTES conversion was about 80% and it is independent on initiator concentration. The high conversion is believed to be due to auto hydrolysis of ethoxy groups in aqueous solution and subsequent condensation to form in situ silica. Reinforcement effect of the in situ silica on DPNR is investigated in terms of tensile properties. The stress at break of in situ silica-reinforced natural rubber was about 3 times higher than that of non-reinforced natural rubber. TEM images show that the silica particles with the size less than 200 nm were well dispersed in NR matrix.
Keywords
natural rubber, VTES, graft copolymerization, in situ nanosilica, morphology
Article Details
References
[1] Ono S., Kiuchi Y., Sawannabori J., Ito M.; Structure development in silica filled rubber composite; Polymer International, 48 (1999) 1035-1041.
[2] Maria Augusta de Luca, Tais Espindola Machado, Renan Beretta Notti, Marly Maldener Jacobi; Synthesis and characterization of epoxidized styrene-butadiene rubber/silicon dioxide hybrid materials; J Appl Polym Sci, 92 (2004) 798-803.
[3] A. Bandyopadhyay, M. De Sarkar, A. K. Bhowmick; Epoxidised natural rubber/silica hybrid nanocomposite by sol-gel technique: Effect of reactants on the structure and properties; Journal of Materials Science, 40 (2005) 53-62.
[4] Messori M., Fiorini M.; Isoprene rubber filled with silica generated in-situ; Journal of Applied Polymer Science, 119 (2010) 3422-3428.
[5] Yoshikaki K., Ohsaki T., Furutaka M.; Silica reinforcement of synthetic diene rubbers by sol-gel process in the latex; Journal of Applied Polymer Science, 85 (2002) 2053-2063.
[6] Nurul H. Y., Kosugi K., Fukuhara L., Yamamoto Y., Kawahara S.; Preparation and properties of natural rubber with filler nanomatrix structure; Colloid Polymer Science, 239 (2015) 2249-2256.
[7] Kawahara S., Nurul H. Y., Noguchi K., Kosugi K., Yamamoto Y.; Organic-Inorganic nanomatrix structure and properties of related natural occurring rubbery; Polymer, 55 (2014) 5024-5027.
[8] Natalia A. Agudelo, Leon D. Perez, Betty L. Lopez; A novel method for the synthesis of polystyrene-graft-silica particles using random copolymers based on styrene and vinyltriethoxysilane; Applied Surface Science, 257 (2011) 8581-8586.
[9] Yin C., Zhang Q., Gu J., Zheng J., Gong G., Liang T., Zhang H.; In-situ silica reinforcement of vinyltriethoxysilane-grafted styrene-butadiene-rubber by sol-gel process; Journal of Applied Polymer Science, 128 (2013) 2262-2268.
[2] Maria Augusta de Luca, Tais Espindola Machado, Renan Beretta Notti, Marly Maldener Jacobi; Synthesis and characterization of epoxidized styrene-butadiene rubber/silicon dioxide hybrid materials; J Appl Polym Sci, 92 (2004) 798-803.
[3] A. Bandyopadhyay, M. De Sarkar, A. K. Bhowmick; Epoxidised natural rubber/silica hybrid nanocomposite by sol-gel technique: Effect of reactants on the structure and properties; Journal of Materials Science, 40 (2005) 53-62.
[4] Messori M., Fiorini M.; Isoprene rubber filled with silica generated in-situ; Journal of Applied Polymer Science, 119 (2010) 3422-3428.
[5] Yoshikaki K., Ohsaki T., Furutaka M.; Silica reinforcement of synthetic diene rubbers by sol-gel process in the latex; Journal of Applied Polymer Science, 85 (2002) 2053-2063.
[6] Nurul H. Y., Kosugi K., Fukuhara L., Yamamoto Y., Kawahara S.; Preparation and properties of natural rubber with filler nanomatrix structure; Colloid Polymer Science, 239 (2015) 2249-2256.
[7] Kawahara S., Nurul H. Y., Noguchi K., Kosugi K., Yamamoto Y.; Organic-Inorganic nanomatrix structure and properties of related natural occurring rubbery; Polymer, 55 (2014) 5024-5027.
[8] Natalia A. Agudelo, Leon D. Perez, Betty L. Lopez; A novel method for the synthesis of polystyrene-graft-silica particles using random copolymers based on styrene and vinyltriethoxysilane; Applied Surface Science, 257 (2011) 8581-8586.
[9] Yin C., Zhang Q., Gu J., Zheng J., Gong G., Liang T., Zhang H.; In-situ silica reinforcement of vinyltriethoxysilane-grafted styrene-butadiene-rubber by sol-gel process; Journal of Applied Polymer Science, 128 (2013) 2262-2268.