• Proceedings of the Materials Research Society of Korea Conference
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• 1995.11a
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• pp.105-105
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• 1995

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1995.11a
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• pp.108-108
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• 1995

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1995.11a
• /
• pp.110-110
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• 1995

• Proceedings of the Materials Research Society of Korea Conference
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• 2001.11a
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• pp.110-110
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• 2001

• Proceedings of the Materials Research Society of Korea Conference
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• 2000.11a
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• pp.135-135
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• 2000

• Proceedings of the Materials Research Society of Korea Conference
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• 1996.05a
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• pp.94-95
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• 1996

• Proceedings of the Materials Research Society of Korea Conference
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• 1997.05a
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• pp.78-79
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• 1997

• Polymer(Korea)
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• v.29 no.2
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• pp.166-171
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• 2005

EPDM (ethylene propylene diene monomer)/silicone rubber blends were prepared and the influence of a compatibilizer and thermal aging on the properties of the blends was investigated. The blends of which the compositions were varied in the range of 90/10 through $10/90\;wt\%$ were melt mixed by using a Brabender Plasticoder (internal mixer) and were vulcanized by a hot press. The morphology of the vulcanized EPDM/SR blends was examined by scanning electron microscopy (SEM). After the thermal Aging for 24, 48, 96 hrs at $100^{\circ}C$ in an air oven, hardness, tensile strength, elongation and contact angle of the blends were investigated. From the result of the morphology, it was confirmed that the domain size of the blends containing the compatibilizer was reduced. As the increase of the thermal aging time, hardness and tensile strength of the blends decreased but elongation and contact angle increased.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.595-601
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• 2020

During the safety inspection of nitrocellulose-made explosive containers stored for more than 10 years, cracks were found in the containers. Therefore, a failure cause analysis test was performed. First, the cause of failure through the failure tree analysis was conducted to select the factors that influenced failure. The changes in the properties of the container caused by the acceleration of the reaction were found to be the cause of the failure by confirming the influence on the environment and internal/external factors that may occur during storage. To confirm this, environmental tests, such as thermal shock test and vacuum thermal stability test, were performed using a naturally aged container to analyze the cause of failure, and an accelerated aging test was performed to reproduce the failure. Through this, the chemical reaction was accelerated by heat and charge, as in the result of the fault tree analysis, and it was confirmed that the physical properties of the container were changed. In addition, the service life of the container was estimated using the Arrhenius model for the storage life due to thermal aging.

• Journal of Physiology & Pathology in Korean Medicine
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• v.24 no.1
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• pp.85-90
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• 2010

Several studies have demonstrated that ginseng-berry extract has several beneficial properties, including anti-inflammatory, antioxidant, and vasodilation properties. Ginseng-berry extract has also been shown to have the great potential against skin aging. Its beneficial mechanism against skin aging, however, has not been examined in detail. Also, the effects of ginseng-berry extract on microcirculation and skin cellular responses have not been investigated. Inhibition of skin microcirculation is the primary cause of many adverse biological effects, which is responsible for the skin aging and darkening. We investigated the beneficial effects of ginseng-berry extract on blood circulation, transcutaneous oxygen pressure in vivo model and also on skin microcirculation, cellular response and skin brightening effect in clinical trial. We found that oral administration of ginseng-berry extract markedly increased blood flow rate and transcutaneous $O_2$ pressure, but decreased transcutaneous $CO_2$ pressure. Also, it improved skin tone on cheeks, as is skin brighteness. These results suggest that ginseng-berry extract is a potent candidate for the treatment of skin aging and brightening by improving skin microcirculation.