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Choothong N, Kawahara S. BROMINATION OF NR WITH N-BROMOSUCCINIMIDE. RUBBER CHEMISTRY AND TECHNOLOGY 2021. [DOI: 10.5254/rct.21.78980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
The mechanism of bromination of NR was studied by solution-state 1H-NMR spectroscopy. The bromination of NR was carried out at 20–50 °C with N-bromosuccinimide as the brominating agent, and the kinetic study of bromination was conducted under nitrogen atmosphere at 30–50 °C for various reaction times. The influence of bromine atom substituent on the bromination rate constant (k) also was investigated. Bromine atom content was found to be dependent upon the reaction time, indicating first-order kinetics. The activation energy of bromination of NR, calculated from the reaction rate constants, was 19.3, 5.5, and 5.8 kJ mol−1 for bromine atom linked to carbon atom with methylene proton and methylene protons, respectively.
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Affiliation(s)
- Nuorn Choothong
- Department of Materials Engineering, Faculty of Engineering, Rajamangala University of Technology Rattanakosin, Salaya, Phuttamonthon, Nakornprathom 73170, Thailand
| | - Seiichi Kawahara
- Department of Material Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
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Durga G, Kalra P, Kumar Verma V, Wangdi K, Mishra A. Ionic liquids: From a solvent for polymeric reactions to the monomers for poly(ionic liquids). J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116540] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Choothong N, Shioyama S, Yamamoto Y, Kawahara S. Preparation of phenyl-modified natural rubber in latex stage. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nuorn Choothong
- Department of Materials Science and Technology, Faculty of Engineering; Nagaoka University of Technology; 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan
| | - Shintaro Shioyama
- Department of Materials Science and Technology, Faculty of Engineering; Nagaoka University of Technology; 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan
| | - Yoshimasa Yamamoto
- Department of Chemical Science and Engineering; National Institute of Technology, Tokyo Collage; 1220-2 Kunigida-cho Hachioji Tokyo 193-0997 Japan
| | - Seiichi Kawahara
- Department of Materials Science and Technology, Faculty of Engineering; Nagaoka University of Technology; 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan
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Choothong N, Kosugi K, Yamamoto Y, Kawahara S. Characterization of brominated natural rubber by solution-state 2D NMR spectroscopy. REACT FUNCT POLYM 2017. [DOI: 10.1016/j.reactfunctpolym.2017.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Weiss E, Gertopski D, Gupta MK, Abu-Reziq R. Encapsulation of ionic liquid BMIm[PF6] within polyurea microspheres. REACT FUNCT POLYM 2015. [DOI: 10.1016/j.reactfunctpolym.2015.09.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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