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아민기능기가 화학결합된 유기 층상 kenyaite의 제조
황윤형,정순용,이정민,공성호 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
Organo-kenyaite that interlayer surface bonded chemically with amine groups were prepared by sililation of γ-aminopropyltriethoxysilane (APS) with interlayer Si-OH groups in the presence of gallery expander dodecylamine (DDA) in ethanol. The interlayer surface sililation were performed by the vaporization of ethanol from the slurry composed of APS, DDA, H-kenyaite and ethanol. XRD analysis of dried-powder resulted in well-ordered large d-spacing of 41.4-51.2 Å. 29Si solid state NMR showed a substantial increase in the relative intensity Q4 signals due to newly formed Q4 units by the sililation of interlayer surface Si-OH groups. This result should offer a promising route leading to the preparation of organo-layered materials that a various functional group are bonded chemically in interlayer surface.
평일 시간활동패턴을 활용한 도시 인구의 유사노출집단 분류
황윤형,이기영,윤충식,양원호,유승도,김근배 한국환경보건학회 2016 한국환경보건학회지 Vol.42 No.6
Objectives: Determining the time activity patterns of urban populations is critical when performing an exposure assessment. The purposes of this study were to classify urban populations in Korea by their time activity patterns and to identify factors that influence these patterns. Methods: The time activity patterns of 31,634 and 20,263 individuals were obtained from two national databases collected in 2004 and 2009, respectively. The two largest metropolitan cities in Korea, Seoul and Busan, were selected for this analysis. For each city, multivariate linear regressions were performed to determine factors affecting the time spent in a residence and in transit. We also used cluster analysis to classify each urban population by activity pattern. Results: Nine distinctive activity patterns were identified in the Seoul and Busan populations, respectively, and the resulting classified population groups had specific characteristics. The identified patterns were similar for Seoul and Busan. The most significant factors affecting time spent in a residence were employment status, age, marriage status, education, and gender. Gender, education, employment status, and monthly income were significant factors affecting time spent in transit. Conclusion: These results indicate that, in addition to region, exposure scientists in Korea should consider classifying populations based on age, gender, and occupation.
연구참여자에 의한 주택실내 휘발성 유기화합물 농도의 측정
황윤형,이기영,김서진,홍윤철,전종관,조수헌,Hwang, Yun-Hyung,Lee, Ki-Young,Kim, Seo-Jin,Hong, Yun-Chul,Jun, Jong-Kwan,Cho, Soo-Hun 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.5
Objectives: Exposure to hazardous chemicals during pregnancy may result incritical reproductive health outcomes. Indoor residential levels are significant component of personal exposure. The collection of residential exposure data has been hampered by the cost and participant burden of health studies of indoor air pollution. This study utilized a participant-based approach to collect volatile organic compounds concentration from homes. Methods: Four hundred thirteen women were recruited from three major hospitals in Seoul and Gyeongi Provence and 411 agreed to participate. A passive sampler (OVM 3500, 3M, USA) with instructions were given to the participants, as well as a questionnaire. They were asked to deploy the sampler in their homes for three to five days and return them viapre-stamped envelope. Results: Three hundred forty six participants returned the sampler. Among the returned samplers, three hundred samplers satisfied our monitoring quality criteria. The success rate of the monitoring method was 73%. The geometric mean of TVOC level was 429(2) ${\mu}g/m^3$. The TVOC guideline of 500 ${\mu}g/m^3$ was exceeded in 38% of the houses. The residential VOC levels were significantly associated with remodeling of the house. Conclusions: The results suggested that a participant-based sampling approach may be a feasible and costeffective alternative to exposure assessment involving home visits by a field technician.
기능성 유기 층상 실리케이트의 제조와 나노복합재료의 응용
황윤형,정순용 한국공업화학회 2002 응용화학 Vol.6 No.2
Organo layered silicate that interlayer surface bonded chemically with amine groups were prepared by sililation of v-aminopropyltriethoxysilane (APS) with interlayer Si-OH groups in the presence of gallery expander dodecylamine (DDA) in ethanol. The interlayer surface sililation were performed by the vaporization of ethanol from the slurry composed of APS, DDA, H-kenyaite and ethanol. XRD analysis of dried-powder resulted in well-ordered large d-spacing of 4.1-5.2 nm. <sup>29</sup>Si solid state NMR showed a substantial increase in the relative intensity Q^4 signals due to newly formed Q<sup>4</sup> units by the sililation of interlayer surface Si-OH groups. The properties of nanocomposite were measuered by TEM and SAXS. The distance in the interlayers was expanded up to 5~6 nm. Nanocomposite is well exfoliated and dispersed by extension of interlayers caused by the intercalation of epoxy resin. This result should offer a promising route leading to the preparation of organo-layered materials that a various functional group are bonded chemically in interlayer surface.
황윤형,정순용,공성호,권오윤 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-
Polymer-layered silicate nanocomposites의 제조는 실리케이트 층상구조를 가진 점토광물(clay)을 나노사이즈로 박리(exfoliation)시켜 고분자수지에 분산시킴으로써 우수한 물성을 가진 신소재를 얻기 위함이다. 그러나, 이러한 층상 실리케이트는 강력한 Van der waals 인력을 가지고 있어서 고분자 수지에 박리, 분산시키기가 매우 어렵다. 본 연구에서는 epoxy 수지에 점토광물을 분산 박리 시키기 위한 전 단계로서, amine-polyoxypropylenediamine 혼합용액 중에서 합성 혹은 천연 점토광물의 층 내부로 amine과 polyoxypropylenediamine이 층간삽입(intercalation)되는 거동을 조사하였다. 이 과정에서 amine은 점토광물의 층 내부로 쉽게 층간 삽입될 수 있으며, 이때 용매화된 polyoxypropylenediamine 분자도 함께 층 내부로 끼어 들게 된다. polyoxypropylenediamine은 대표적인 epoxy 수지의 경화제이기 때문에 이들의 층간삽입여부는 epoxy에 점토광물을 효과적으로 박리 분산시킬 수 있는 중요한 단서가 되므로, 기존의 여러 단계로 이루어지던 epoxy-clay nanocomposite의 제조공정을 단일 단계로 줄일 수 있는 계기가 되리라 예상된다.