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Hydrophobic - Hydrophilic 분체의 계면활성제에 의한 Wettability 연구
노승백,임미애 ( Seung Baik Rho,Mi Ae Lim ) 한국공업화학회 1998 공업화학 Vol.9 No.2
분체 형태의 소수성 고분자 polymethylmethacrylate(PMMA), poly vinyl chloride(PVC)와 친수성 금속 aluminium에 대한 water, glycerol, formamide, diiodomethane, 1,1,2,2-tetrabromoethane, 1-bromonaphthalene, acetone, chloroform, benzene, ethanol과 methanol과의 접촉각을 Washburn식을 기본으로 한 wicking법으로 측정하였다. 또한, 농도에 따른 음이온 계면활성제 SDS(sodium dodecyl sulfate)와 양이온 계면활성제 CTAB(cetyl trimethylamonium bromide) 수용액과의 접촉각을 측정하였다. 유기액체들과의 측정된 접촉각으로부터 Zisman plot을 사용하여 임계표면장력, γc를 예측하였으며, 농도에 따른 계면활성제 SDS와 CTAB수용액과의 접촉각으로부터 adhesion tension plot을 사용하여 γc를 예측하였다. 유기액체, 계면활성제 SDS와 CTAB수용액에 대해서 분체 PMMA의 γc는 각각 43.5, 28.3과 36.2mNm^(-1)이며, 분체 PVC의 γc는 각각 44.2, 28.0과 34.8mNm^(-1)값을 얻었다. 이로부터, 고체 표면의 적심성과 성질이 계면활성제의 첨가에 의해 변화됨을 알 수 있었다. 또한, 측정된 접촉각으로부터 조화평균식을 사용하여 각 고체의 표면자유에너지, γs와 그 성분 값들을 결정하였다. The contact angle on powder hydrophobic polymer PMMA(polymethylmethacrylate), PVC(poly vinyl chloride) and hydrophilic metal aluminium was measured by wicking method on the base of Washbum equation for water, glycerol, formamide, diiodomethane, 1,1,2,2-tetrabromoethane, 1-bromonaphthalene, acetone, chloroform, benzene, ethanol, methanol, and for anionic surfactant SDS(sodium dodecyl sulfate) and cationic surfactant CATB(cetyl trimethylamonium bromide) aqueous solutions with concentrations. The values of γc estimated by Zisman plot and adhesion tension plot for contact angle with organic liquids, SDS, and CTAB aqueous solutions were 43.5, 28.3, and 36.2 mNm^(-1) for PMMA and 44.2, 28.0, and 34.8 mNm^(-1) for PVC, respectively. From the results, it was considered that wettability and characteristics of solid surface were transformed by adding surfactant. The surface free energy, γs and its components of PMMA, PVC, and aluminium were determined using harmonic equation.
Wicking법에 의한 분체 PMMA와 PVdF의 접촉각과 표면자유에너지 결정
임미애,노승백 啓明大學校 産業技術硏究所 1996 産業技術硏究所 論文報告集 Vol.19 No.1
The value of contact angle on powder polymethylmethacrylate(PMMA) and polyvinylidene fluoride(PVdF) has measured by wicking method on the base of Washburn equation for water, glycerol, formamide, diiodomethane, 1,1,2,2,-tetrabromoethane, 1-bromonaphthalene, and hexadecane. The measured values were comparable that of film type contact angle measurement. In wicking method, pore average radius has determined from measured values wetting height and mass of powder to liquid in packed column. From the measured contact angle values, surface free energy(γs) of powder PMMA and PVdF was determined by using geometric mean, van Oss approach method and equation of state of Neumann. It is shown that the results of γs depends on interaction with liquids. The solid-liquid interfacial free energy(γS L), interaction parameter(φ) and work of adhesion(WA)were also determined for powder PMMA and PVdF to water and organic liquids.
노승백,임미애 啓明大學校 産業技術硏究所 1995 産業技術硏究所 論文報告集 Vol.18 No.-
The control of pH is a very important process in physical, chemical and biological fields. Though the pH control can be applicable in several fields, the pH process has been known difficult to control due to its high nonlinearity. To resolve this problem, it has been actively investigated to convert a nonlinear control problem into a linear one. In this paper, linear pH control schemes were suggested from the derivation of the linearization relationship and models for a pH process were developd. Real processes were simulated using the optimum concentration and equilibrium constant obtained by the two and three parameter models. The simulation was performed using the estimated parameters by means of the PI controller. According to the simulation results, the proposed method has revealed that responses are fast with the change in the setpoint and the control performance is superior to existing control method.
박진규,노승백,임미애,손전익 한국고무학회 1998 엘라스토머 및 콤포지트 Vol.33 No.1
The surface of wiper blade(W/B) rubber was chlorinated by chemical treatment method using the hydrochloric acid(HCl) and sodium hypochlorite(NaOCl). From the results of contact angle measurement, friction coefficient measurement, and ATR-IR spectra, the surface characteristics of chlorinated W/B rubber with time of chlorination were studied. Contact angles for W/B rubber with increasing time of chlorination and chlorine concentration were measured for the water and ethylene glycol. From the results, contact angle fell rapidly with increasing time of chlorination and chlorine concentration, reaching a constant value after about 10min. And the wettability of W/B rubber surface by means of chlorination has been improved. For an unchlorinated W/B rubber, the friction coefficient with time of chlorination decreased from 1.27 to 0.20∼0.23 on full chlorination. As the results it was considered that abrasion resistance of W/B rubber surface has been also improved. The values of pH and Cl^- ion concentration in a chlorine treatment solution decreased as the extent of chlorination of W/B rubber surface increased. From the results of ATR-IR spectra, it was observed that C=C double band of W/B rubber surface transformed into C-Cl band, but quantitative determination of the extent of chlorination was not feasible because of the complexity of chlorination reactions.