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아연 메타아크릴레이트로 보강된 발포고무 나노복합체의 발포거동, 구조 및 특성
욷팔바술리 ( U. Basuli ),이기쁨 ( G. B. Lee ),장세영 ( S. Y. Jang ),오재호 ( J. Oh ),이지홍 ( J. H. Lee ),김성철 ( S. C. Kim ),전남덕 ( N. D. Jeon ),허양일 ( Y. I. Huh ),나창운 ( C. Nah ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.4
나노보강제의 하나인 아연 메타아크릴레이트 (ZMA)로 보강된 천연고무(NR)/부타디엔고무(BR) 블랜드에 발포제 함량을 달리하여 적용하여 발포거동을 관찰하였다. ZMA 첨가에 따라 전반적인 발포고무의 물성은 향상되었지만, 발포입자크기, 밀도, 발포도 등 발포입자의 모폴로지에는 크게 영향을 미치지 않았다. 발포제의 함량에 따라 발포고무의 기계적 물성은 크게 영향을 받는 것으로 나타났다. 발포제 함량 증가에 따라 발포도가 증가하였고, 이는 발포고무의 밀도감소로 나타났지만, 발포입자의 크기나 분산성은 크게 영향을 받지 않았다. 고함량 스티렌-부타디엔 고무(HSBR)의 영향도 함께 조사하였다. HSBR 함량 증가에 따라 발포입자의 크기는 작아졌고 분산성은 향상되었다. 발포고무는 대변형에서 에너지 흡수성이 뛰어난 것으로 나타났다. Different amounts of foaming agents were employed in natural rubber(NR)/butadiene rubber(BR) blends to understand the foaming behavior in presence of nano-reinforcing agent, zinc methacrylate (ZMA). The ZMA greatly improved most of the mechanical properties of the rubber foams, however it did not show considerable effect on the cell morphology, such as cell size, density and porosity. It was also observed that the foaming agent concentration affected all the mechanical parameters. When the content of foaming agent was increased, the number of foams was increased leading to a decrease in density of the compounds. But the size and distribution of foams remained unchanged with increased foaming agent. The effect of high styrene-butadiene rubber (HSBR) was also studied. The size of cells became smaller and the cell uniformity was improved with increasing HSBR. The foam rubber compounds showed much efficient energy absorbing capability at higher strains.
"Neurovascular Island Graft을 이용한 무지 재건술 -1예 보고-"
나수균,김연일,장세영,이병일,최창욱 순천향대학교 1988 논문집 Vol.11 No.1
The neurovascular island graft is an accepted method of restoring sensation to a localized tactile area on the hand. The procedure has been used to provide sensation to the volar surface of pedicle flaps on the thumb and to replace pulp tissue avulsed from the thumb or index finger. The patient had injured on right thumb by trauma and treated with autogenous bone graft and pedicle flap at local clinic, transferred at out department. We performed neurovascular island graft for defective sensibility of right thumb from the ulnar side of the right ring finger. In follow up for one year, recovery of protective sensation was good but reorientation of sensation was good but reorientation of sensation was poor.