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저온 플라즈마 처리에 의한 전자파 차폐성 금속화 합성섬유의 계면 밀착성 개선
천태일 동의대학교 생활과학연구소 1998 生活科學論集 Vol.2 No.-
In this study we have examined electroless chemical plating on the plasma grafted poly[ethylene terephathalate](PET) fabric in order to improve the interfacial adhesion between metal and fiber. The vapour phase of acrylic acid introduced on the PET surface and the graft polymerization was carried out by using cold plasma, resulting in the grafting yield of 0.8-1.3 wt%. The carboxyl group of the plasma grafted was identified by FT-IR-ATR spectra. The interfacial adhesion was related to the carboxyl group. After electroless chemical plating of nickel, it showed that the more the carboxyl, the better the interfacial adhesion. Comparing to the untreated, the plasma grafted fabric showed fairly good interfacial adhesion(5B grade, ASTM D3359). The shielding effect of electromagnetic wave showed 95dB. The shielding effect depends on the fabric structure, the surface structure, and the cross sectional shape of fibers. The dense fabric structure, the etched surface like a microcrater, and the trigonal cross sectional shape were prefered.
천태일 東義大學校 生活科學硏究所 1999 生活科學論集 Vol.3 No.-
In this study we have investigated the mordanting effect of natural mordants such as camellia ash, bean chaff ash and iron plasma on silk fabrics dyed with green tea extracts. Experimental variables include ultraviolet shielding effect, light fastness, dry-cleaning fastness, and tensile strength of silk fabrics dyed with green tea extracts before and after mordanting. Ultraviolet shielding effect, light fastness of silk fabrics dyed with green tea extracts was improved as compared with untreated silk fabric, and moreover those of camellia ash mordanted fabrics were improved remarkably. But iron mordanted fabrics deteriorated the color fastness. Tensile strength and elongation of Silk fabrics were increased but those of silk fabrics mordanted with camellia and bean chaff ash were decreased.
천태일 東義大學校 生活科學硏究所 2003 生活科學論集 Vol.7 No.-
Skin Patch Test and Antibacterial Properties of the reaction products between Poly(Hexamethyl Biguanide) hydrochloride and Trimethylol Melamine on textile fabircs were examined. Antibacterial Activities of Anti-microbial agent treated samples are very good. The reduction ratios for four kinds of Colonies are 99.9 % after repeated laundering ten times. Skin Patch Test Results for Anti-microbial agent treated samples are Almost-negative by Hi-Scope judgement and Macroscopical judgement.
저온 플라즈마를 이용한 Poly(ethylene Terephthalate)에의 아크릴산의 기상 그라프트 공중합 반응 (II) 표면 특성 분석 및 평가
천태일,최석철,모상영,Cheon, Tae-Il,Choe, Seok-Cheol,Mo, Sang-Yeong 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.8
In the pervious paper, the plasma graft polymerization onto PET surface has been reported. In this paper, the resulting surface characteristic was investigated. The acrylic acid grafts were converted to the corresponding sodium salts by treatment with sodium carbonate. The sodium content of the grafts was determined to be around 318 ppd-1148 ppd by atomic absorption analysis. The soium salts of the grafts were highly hydrophilic as measured by wettability and antistatic properties. After dyeing with a basic dye, the color difference value determined by computer color matching(CCM) system and UV-visible spectrophotometer. The dyeability was markedly increased. It largely depended on the carboxylic acid content of the grafts. It was also verified that there was no change in wettability on aging by contact angle measurement.
천태일 東義大學校 生活科學硏究所 2002 生活科學論集 Vol.6 No.-
In this study we have examined electroless chemical plating on the synthetic fabrics, poly[ethylene terephathalate](PET) fabric in order to survey the relation between fabric structure and electromgnetic wave shielding effect. After electroless chemical plating of copper and nickel, The shielding effect showed 95-70dB. The shielding effect depends on the fabric structure and the cover factor of fibers. The more dense, the better shielding.
천태오,양홍준 韓國生物敎育學會 1996 생물교육 Vol.24 No.2
To promote science and technology and to foster scientific mind of people, Kyungpook Science Exhibition(the Prime Minisver Ordinance #70, July 16, 1969) had been held every year from 1962(8th) to 1995(41th). The number of articles exhibited in the section of biology during that time was 1,282. In this study, these articles wire divided into 5year-term and classified according to the level of school, the social position of exhibitors, the field of study, the content and the species used in those articles. The results are summarized as follows; 1. The proportions of exhibitions according to the level of school were 83.5%(elementary school), 11.9%(middle school) and 14.5%(high school). The number of exhibits prepared by the students of elementary school had been increased year after year, but that of exhibits prepared by the students of middle and high school had been decreased. The reason seems to be due to the psychological burden of the entrance examination for the school of higher grade in the current school system. 2. The social position of exhibitors and its proportion were student(82.4%), teacher(17.5.%) and civilian(0.1%). The exhibits prepared by teachers were decreased year after year. 3. The materials used in those exhibits and its proportion were plant(50.3%), animal(43.6%), microorganism(1.6%), apparatus(1.4%), specimen(0.8%) and others(2.3%). It seems that plant and animal living materials were evenly used in these exhibits. 4. In the analysis of contents, exhibits studied about morphology and taxonomy were occupied mostly in the early 1960s. since then, those about ecology and physiology were increased. Exhibits about environmental pollution which were not appeared were increased since the late 1980s. 5. The proportion of taxa in plants employed and studied in the exhibits were 63.8% (Magnoliopasida), 13.5% (Liliopsida), 4.9% (Eumycetes), 4.6% (Protozoa) and 3.9% (Pinophyta). In detail, Rosidae was studied mostly in Magnoliopasida and Commelinidae mostly in Liliopsida. The proportion of taxa in animals were 49.6% (Arthropoda), 30.0% (Vertebrata), 12.4% (Mollusca) and 4.8% (Annelida). Insects, Fishes and Gasropoda were studied mostly in arthrpoda, vertebrate and Mollusca, respectively. 6. The frequency of exhibition as a species of plants studied during 34 years was 45(kidney bean), 15(vine), 12(pine tree), 5.9(balsam), 8(rice plant), 7(pumpkin) and 7(morning glory) which were abundant around our living areas, while in animals, ant, leopard frog, spider, crucian carp and snail were appeared 24, 24, 22, 20, 18 times, respectively. 7. The period in which the local exhibition was held should be changed from first to second semester and the national exhibition should be held in December.