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미끄럼 방지 바닥 도료용 폴리프로필렌 수지의 화학적 분쇄에 관한 연구
김대인 ( D L Kim ),정화영 ( H Y Chung ),황석환 ( S H Hwang ),조익성 ( I S Cho ),윤경준 ( K J Youn ),조백수 ( B S Cho ),김광국 ( K K Kim ),윤강재 ( K J Yun ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.6
In this study, some experimental results of the peroxide-degradation process of polypropylene(PP) in a co-rotating twin-screw extruder to produce controlled rheology polypropylene(CRPP) are presented. The peroxide was dicumyl peroxide(DCP) and the concentration of DCP was in the range 0-0.3wt%. It was found that the rheological properties of PP change significantly during reactive extrusion. Melt fiow index(MFI) increased with DCP concentration. Intrinsic viscosity decreases with increasing DCP concentration. From dynamic rheological data, number ave-rage molecular weight(Mn), weight average molecular weight(Mn) and molecular weight distribution(MWD) were cal-culated. Results indicated that Mw decreases and MWD becomes narrower with increasing peroxide concentration. Especially, particle size distribution of CRPP decreases with increasing DCP concentration by chemical powdering process, and anti-slip floor paint, CRPP(DCP 0.2 wt%) powder by 10phr was friction coefficient 2.15μ, abrasion resis-tance 511.18%.
김대인(D . I . Kim),최현우(H . W . Choi),임성직(S . J . Lim),박용구(Y . K . Park),허주엽(C . Y . Huh),김승보(S . B . Kim) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.11
The primary vaginal cancer is rare, accounting for approximately 2-3% of all gynecologic malignancies. The most common site is in the upper one-third on posterior wall and squamous cell carcinomas is the most common pathologic type, occurring in 80% of the vaginal cancers. The most common syrnptoms are painless vaginal bleeding and vaginal discharge. Treatment selection is based on the clinical exa#rnination and most tumors are treated by radiation therapy. We have experienced one case of the primary vaginal cancer in a 51 year old, who had postcoital bleeding. The patient was managed with neoadjuvant chemotherapy, there-after operated, followed radiation therapy. We report the result with the review of literature.