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정련폐액으로 부터 회수한 세리신을 이용한 세리신/PVA 블렌드 섬유의 제조 및 특성분석
윤해성,강한솔,양태웅,이기훈,Yun, Haesung,Kang, Hansol,Yang, Taewoong,Lee, Ki Hoon 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.3
Sericin/PVA blend fibers were prepared using sericin that had been recovered during conventional degumming. Pure recovered sericin (RS) fibers could not be formed because of their low molecular weights. By blending the RS with PVA, it could be spun into fibers. A maximum draw ratio of 7.5 was achieved when the PVA/RS blend ratio was 80:20. The morphologies of the PVA/RS fibers were equivalent to those of the blend fibers prepared with hot-water extracted sericin (HS). The elongations at failure and Young's moduli of the PVA/RS and PVA/HS blend fibers were not significantly different. However, the ultimate strengths of the PVA/RS blend fibers were lower than those of the PVA/HS blend fibers. XRD data revealed that the crystallinities of the blend fibers decreased in the presence of RS.
대전시 일부 지하상가 공기중 포름알데히드 농도 및 종사자들의 자각증상에 관한 연구
양태웅,장성실 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1
This study was performed to get the fundamental data establishing environmental formaldehyde threshold limit as well as to contribute the health promotion of merchants and customers in two underground shopping-centers in Taejon from Dec. 1997 to Jan. 1998. Formaldehyde concentration and three climate factors-air current, humidity, and temperature-were measured at exit., hallway and inside shops in underground environment, and questionnaire about 15 subjective symptoms among 120 merchants in the inside shops were also surveyed by means of the questionnaire for screening workers exposed formaldehyde in Korea. The results were as follows ; 1. The average formaldehyde concentration in whole area was 0.0299 ppm ; Exit, Hallway and Inside shop were 0.0205 ppm, 0.0325 ppm and 0.0366 ppm, respectively(p<0.000). 2. According to simple regresson analysis, air current(r=-0.2517, p<0.05) and temperature(r=0. 5871, p<0.001) were significantly related to formaldehyde concentration. 3. More than 80% of the merchants have 5 subjective symptoms such as easy fatigahility, headache, throat discomfort, conjunctival injection, and nasal congestion. With all above the results, it can be suggested that environmental formaldehyde threshold limit at underground in Korea be reestablished, regarding related climate factor-air current and temperature-, and the questionnaire for screening subjective symptoms should be developed again for evaluating the evironmental effect of formaldehyde.