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나프탈렌 및 그 유도체들과 클로라닐의 전하이동 착물에 관한 연구
문정대,장춘학,Jung-Dae Moon,Chun-Hag Jang 대한화학회 1993 대한화학회지 Vol.37 No.3
나프탈렌, ${\alpha}$- 또는 ${\beta}$-메틸 나프탈렌 그리고 1,2- 1,3- 또는 2,6-디메틸나프탈렌과 클로라닐의 전하이동 착물의 흡수 극대 파장은 염화에틸렌, 염화메틸렌, 클로로포름 용매에서 그리고 10, 15, 20, 25$^{\circ}C$ 온도에서 자외선 분광광도법으로 측정하였다. 이 전하이동착물은 1:1 분자비로 결합하였으며 흡수극대 파장은 용매의 극성과 온도에 따라 변하였고, 형성상수(K$_f$)는 용매의 극성 그리고 온도가 증가함에 감소하였다. 이와같이 온도 및 용매가 형성상수에 미치는 효과를 열역학적 고찰로써 논의하였으며, 또한 전자주개들의 전자 및 입체 효과가 형성상수에 미치는 영향도 논의하였다. The maximum absorption wavelengths of charge-transfer complexes of naphthalene, ${\alpha}-and{\beta}-methyl$ naphthalene and 1,2-, 2,3-and 2,6-dimethyl naphthalene with chloranil have been measured with a UV spectrophotometer in ethylene chloride, methylene chloride, and chloroform at 10, 15, 20, and 25$^{\circ}C$. This absorption band was interpreted as the charge transfer band of a 1 : 1 molecular complex, and the maximum absorption wavelength was changed as a function of solvent and temperature. Their formation constants (K$_f$) were decreased with the polarity of solvent and the increase of temperature. Thus, the influences of solvent and temperature on the formation constant have been discussed as consideration of thermodynamic properties, and the electronic and steric effects of electron donors on formation constant have been also discussed.
각종 용매계에서 Poly ( Acrylic Acid ) 와 Poly ( Ethylene Oxide ) 의 착체형성에 관한 점성 연구
허득범,강성원,장춘학,송기원,이장우 ( Deuk Beom Heo,Seong Won Kang,Chun Hag Jang,Ki Won Song,Jang Oo Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.4
수용액 중에서 poly (acrylic acid)(PAA)와 poly (ethylene oxide)(PEO)간의 수소결합을 통한 고분자 착체형성에 있어서 용매 및 외부조건의 변화가 미치는 영향을 모세관점도계 및 전위차계를 사용하여 조사하였다. 수용액의 pH가 낮을수록 PAA의 해리도의 감소로 인하여 착체형성이 더욱 유리하였으며, 물-알코올 혼합용매계에서는 알코올의 영향으로 착체형성의 극대점이 PAA/PEO=1 : 1에서 2 : 3으로 이동하였으며, 착체형성의 정도 또한 감소하였다. 그리고, 물에 요소 및 무기염의 첨가는 소수성상호작용 및 정전상호작용의 결과로 수소결합을 통한 착체형성에 방해요인이 되었음을 점도측정을 통한 고분자의 수력학적 크기의 변화를 통하여 확인하였다. A study on polymer complexation between poly (acrylic acid) (PAA) and poly (ethylene oxide)(PEO) via hydrogen bonding in aqueous media was made under different solvent and surrounding conditions using the Ubbelohde viscometer and pH meter. The lower pH condition of aqueous medium was favorable for complex formation due to the decreased dissociation of the PAA carboxyl groups. In water-ethanol (18wt%) mixed solvent system, the most optimum stoichiometric ratio for complexation was shifted from [PAA]/[PEO]=1 : 1 (in pure water) to 2 : 3 with a fairly weakened complexing ability. The addition of ureas and inorganic salts in water seemed to impede the hydrogen-bonded complexation probably due to the combined effects of hydrophobic and electrostatic interactions involved, as judged from the variation in hydrodynamic dimension of the polymer molecules via (reduced) viscosity measurements in dilute solution.
수용액 중에서 고분자 전자주게와 전자받게의 착체형성에 대한 연구
장춘학,류필조 世明大學校 1998 世明論叢 Vol.7 No.-
Under various surrounding conditions, the complexation between polymeric electron-donnor(poly acrylic acid) and elecron-acceptor (poly ethylene oxide and poly vinyl alcohol) througy secondary force in aqueous media hs been studied by using GPC, UV, PH meter and Ubbelohde type viscometer. It is found that the type and active site for complexation are influenced by the bothe of functional group of electron-donnor and elecron-acceptor. The addition of inorganic salts in water seemed to impede the secondary force bonded complexation. The results could be explained in terms of hydrodynamic dimension and elecrostatic interation included.
장춘학 청주대학교 2007 産業科學硏究 Vol.25 No.1
Under various surroundings, the complexation between acidic polymer(poly acrylic acid) and basic polymer(poly ethylene oxide) through secondary force in aqueous media has been studied by using GPC, UV, pH meter and Ubblelohde type viscometer. It is found that the type and active site for complexation are influenced by the both of functional group of proton-donor and proton-acceptor. From the UV measurement of this complex system, the UV absorbance of the band of n-π* decreases while that of π-π* increases with pH has presented evidence for the site of complexation. The addition of inorganic salts in this aqueous system seemed to impede the secondary force bonded complexation. The results could be explained in terms of hydrodynamic dimension and electrostatic included.
최정헌,장춘학,서문규 청주대학교 산업과학연구소 2008 産業科學硏究 Vol.25 No.2
The effects of flame retardant plasticizer on the flame retardancy of PVC were investigated. Binary mixtures of dioctyl phthalate(DOP), tricresyl phosphate(TCP), and isodecyldiphenyl phosphate(S-148) plasticizers were added into PVC resin, and the flammability and flame retardant properties were characterized by 45° combustion tester and smoke density chamber. TCP and S-148 plasticizers exhibited mutual supplemental behavior in flame retardancy and smoke suppression.
최정헌,장춘학,서문규 청주대학교 산업과학연구소 2008 産業科學硏究 Vol.25 No.2
Interpolymer complex formation between proton donor (PAA, PEI) and proton acceptor(PEO, PVA) through hydrogen bonding has been studied on aqueous system by measuring surface tension, UV, pH and viscosity. It has been found that polymer complexs are formed through hydrogen bonding and also polymer complexes are influenced by the both of functional group of proton-donor and proton-acceptor. These findings have been explained as molecular structure of the complementary polymers associated with complex formation. In addition, the maximum and minimum in reduced viscosity of dilute PEI-PVP and PAA-PEO mixed solution are observed respectively in aqueous system. The result could be explained in terms of hydrodynamic dimension and electrostatic interaction.