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Gonokami M, Yamamoto Y, Chaikumpollert O, Ohtake Y, Kawahara S. ANTIOXIDANTS FOR EPDM SEALS EXPOSED TO CHLORINATED TAP WATER. RUBBER CHEMISTRY AND TECHNOLOGY 2014. [DOI: 10.5254/rct.13.87963] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
A suitable antioxidant for a poly(ethylene-co-propylene-co-5-ethylidene-2-norbornene) (EPDM) seal in tap water applications was determined with respect to volatilization and decomposition of the antioxidants. Seals were prepared by mixing EPDM with 1 phr antioxidant and other ingredients followed by vulcanizing the mixture at 433 K for 20 min. The resulting EPDM seals were immersed into chlorinated water to investigate accelerated degradation. The change in antioxidant content was measured by gas chromatography/mass spectroscopy (GC/MS) and high-performance liquid chromatography (HPLC). The weight loss of amine antioxidants during vulcanization was quite low due to their low volatility and decomposition. Antioxidant weight loss during accelerated degradation depended on both the antioxidant's ability to trap radicals and solubility in chlorinated water.
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Affiliation(s)
- Mio Gonokami
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka-machi, Nagaoka, Niigata 940-2188, Japan
| | - Yoshimasa Yamamoto
- Department of Chemical Science and Engineering, Tokyo National College of Technology, 1220-2, Kunugida-machi, Hachioji, Tokyo, 193-0997, Japan
| | - Oraphin Chaikumpollert
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka-machi, Nagaoka, Niigata 940-2188, Japan
- National Metal and Materials Technology Center (MTEC), 114 Thailand Science Park, Paholyothin Rd., Klong 1, Klong Luang, Pathumthani, 12120, Thailand
| | - Yoshito Ohtake
- Chemicals Evaluation and Research Institute, 1600, Shimo-Takano, Sugito-Machi, Kitakatsushika-Gun, Saitama, 345-0043, Japan
| | - Seiichi Kawahara
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1, Kamitomioka-machi, Nagaoka, Niigata 940-2188, Japan
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Degradation profiles in aged EPDM water seals using focused ion beam-scanning electron microscopy. Polym Degrad Stab 2013. [DOI: 10.1016/j.polymdegradstab.2013.08.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Nakamura T, Chaikumpollert O, Yamamoto Y, Ohtake Y, Kawahara S. Degradation of EPDM seal used for water supplying system. Polym Degrad Stab 2011. [DOI: 10.1016/j.polymdegradstab.2011.04.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Fukumori K, Kurauchi T, Kamigaito O. Swelling behaviour of rubber vulcanizates: 1. Real-time pulsed nuclear magnetic resonance measurements. POLYMER 1990. [DOI: 10.1016/0032-3861(90)90294-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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