Analysis of Whitening Phenomenon of EPDM Article by Humid Aging

被引：17
作者：
Choi, Sung-Seen [1 ]
Chung, Hye-Seung [1 ]
Joo, Yong-Tae [2 ]
Yang, Kyung-Mo [2 ]
Lee, Seong-Hoon [2 ]
机构：
[1] Sejong Univ, Dept Chem, Seoul 143747, South Korea
[2] Hyundai Kia Motors, Div Res & Dev, Hwaseong Si 445706, Gyeonggi Do, South Korea
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2012年 / 123卷 / 04期
关键词：
whitening; EPDM; calcium cation; fatty acid; calcium stearate; DIENE MONOMER EPDM; MIGRATION BEHAVIORS; CARBON-BLACK; RUBBER; ANTIOZONANTS; SBR; NR;
D O I：
10.1002/app.34826
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
An ethylene-propylene-diene terpolymer (EPDM) article used for a car component was aged in 80 degrees C humid air (60% relative humidity) for 30 days and in 80 degrees C tap water for 7 days. The aged sample surfaces were changed to white. The aged sample surfaces were analyzed using GC/MS, image analyzer, SEM, EDX, and ATR-FTIR. Calcium stearate was found on the aged sample surface. To confirm the whitening phenomenon, three sulfur-cured EPDM composites with different reinforcing systems (talc/carbon black, calcium carbonate/carbon black, and clay/carbon black) and one resole-cured EPDM composite were prepared and aged in 90 degrees C tap water for 7 days. The sulfur-cured EPDM composites contained stearic acid, whereas the resole-cured EPDM composite did not contain stearic acid. Whitening occurred in the sulfur-cured EPDM samples irrespective of the filler systems but the aged resole-cured EPDM composite surface was not changed. The whitening was due to the formation of calcium stearate as a result of reaction between calcium cation and stearic acid. The calcium cation came from humid air and tap water, while the stearic acid came from the sulfur-cured EPDM samples. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 2451-2457, 2012
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页码：2451 / 2457
页数：7
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