• Bulletin of the Korean Chemical Society
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• 제35권1호
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• pp.182-188
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• 2014

Three new transition metal complexes based on Ozagrel $[Cu(Ozagrel)]_n$ (1), $[Zn(Ozagrel)(Cl)]_n$ (2), ${[Mn_2-(Ozagrel)(1,4-ndc)_2]{\cdot}(H_2O)}_n$ (3), (Ozagrel = 3-(4-((1H-imidazol-1-yl)methyl)phenyl)acrylic acid; 1,4-ndc = 1,4-Naphthalenedicarboxylic acid) have been hydrothermally synthesized and characterized by elemental analyse, IR, TG, PXRD, electrochemical analysis and single crystal X-ray diffraction. X-ray structure analysis reveals that 1 and 3 are 3D coordination polymers, while complex 2 is a two-dimensional network polymer, the 2D layers are further packed into 3D supramolecular architectures that are connected through hydrogen bonds. The electrochemistry of 1-3 was studied by cyclic voltammetry in methanol and water using a glassy carbon working electrode. Also, thermal decomposition process and powder X-ray diffraction of complexes were investigated.

• Elastomers and Composites
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• 제49권3호
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• pp.232-238
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• 2014

수용성 단량체인 아크릴산 (AA)을 단량체로 potassium persulfate (KPS)를 개시제로 이용하여 $60^{\circ}C$에서 $90^{\circ}C$ 사이의 선택된 온도에서 물을 반응매체로 하여 용액중합을 진행하였다. 아크릴산의 농도가 감소하거나 개시제의 농도가 증가하면 분자량은 감소하였다. 중합반응온도를 상승하면 폴리아크릴산 (PAA)의 분자량은 감소하였다. 대부분의 중합반응에서 분산성지수는 1.5 에 근접하는 것으로 관찰되었다. 교반속도가 증가하면서 400 rpm에서 분자량은 최고값을 나타낸 후, 교반속도가 800 rpm에 이르면서 수평균 및 중량평균분자량은 감소하였다. 유리전이온도는 분자량에 따라 크게 변하지 않았으며 $113^{\circ}C$에서 $116^{\circ}C$ 사이의 값을 나타내었다.

• Nuclear Engineering and Technology
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• 제6권3호
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• pp.161-169
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• 1974

Nylon직포의 표면을 친수화 하기 위하여 동시조사법으로 Acrylic acid를 방사선 graft중합시켰다. Monomer용액속서 침지된 Nylon직포를 공기중 또는 진공하에서 ${\gamma}$-선으로 조사시켰다. 직포 표면에 형성된 Polyacrylic acid는 10$0^{\circ}C$의 sodium hydroxide용액(0.1%)으로 대부분 추출되었다. 접목 반응된 생성물의 화학적 조성을 측정하였다. 접목반응된 Polymer와 방사선 처리를 하지 않은 polyamide를 비교하여 볼 때 흡수성이라든가 대전성은 증진되었다.

• 한국응용과학기술학회지
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• 제24권4호
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• pp.399-409
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• 2007

Characteristics of polyaniline anti-corrosive coatings with various primer coating resins(epoxy resin, urethane resin, and others) and top coating resins(epoxy and acrylic urethane resins) were investigated through adhesion, acid resistance, alkaline resistance, water resistance, and anti-corrosion tests. As a result, the anti-corrosive properties of the prepared coatings using polyaniline varied with the types of primer and top coating resins. In this condition, the properties of adhesion, chemical resistance, and water resistance were found to be very satisfactory when using emeraldine base (EB) of polyaniline blended with single-packaged urethane and acrylic urethane resins as the primer coatings, and using acrylic urethane resin as the top coatings. Also, the anti-corrosive function of these anti-corrosive coatings was well preserved for 1000 hr in the salt spray experiment.

• 한국염색가공학회지
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• 제6권2호
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• pp.17-23
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• 1994

Carboxylic acid group gradient surface where the density of carboxylic acid groups changes gradually along the sample length was prepared. Carboxylic acid group gradient surface was produced by the treatment of low density polyethylene sheet using a corona with gradually increasing power, followed by the grad polymerization of acrylic acid. The prepared gradient surface was characterized by the measurement of water contact angle, Fourier-transform infrared spectroscopy in the attenuated total reflectance mode, and electron spectroscopy for chemical analysis.

• Membrane and Water Treatment
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• 제11권3호
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• pp.231-235
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• 2020

Industrialization and modern developments have led to an influx of toxic heavy metals into the aquatic environment, and the accumulation of heavy metals has serious adverse effects on humans. Among the various heavy metal treatment methods, adsorption is very useful and frequently used. Plastic materials, such as polypropylene and polyethylene, have been widely used as filter media due to their mechanical and chemical stability. However, the surface of plastic material is inert and therefore the adsorption capability of heavy metals is very limited. In this study, granular media and fiber media composed of polypropylene and polyethylene are used, and the surface modification was conducted in order to increase adsorption capability toward heavy metals. Oxygen plasma generated hydroxyl groups on the surface of the media to activate the surface, and then acrylic acid was synthesized on the surface. The grafted carboxyl group was confirmed by FT-IR and SEM. Heavy metal adsorption capability of pristine and surface modified adsorbents was also evaluated. Overall, heavy metal adsorption capability was increased by surface modification due to electrostatic interaction between the carboxyl groups and heavy metal ions. Fibrous PP/PE showed lower improvement compared to granular PP media because pore blockage occurred by the surface modification step, thereby inhibiting mass transfer.

• 폴리머
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• 제24권6호
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• pp.763-769
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• 2000

E-beam 전조사법을 이용하여 아크릴산과 스틸렌 단량체를 폴리프로필렌 섬유에 그라프트 반응시켜 PP-g-(AAc/Sty) 공중합체를 합성하고 술폰화 반응시켜 다관능성 섬유상 양이온 교환체를 합성하였다. 합성체의 그라프트율은 물과 메탄올 혼합비가 30 : 70 vol%인 혼합용매에서 아크릴산과 스틸렌, 단량체비가 30 : 70 vol%일 때 190%로 최대이었으며 혼합용매의 조성비가 일정할 때 아크릴산 단량체의 양이 증가할수록 그라프트율은 감소하였다. 또한 이온교환체의 이온교환용량은 4.6 meq/g이었으며, 술폰화 이온교환체와 아크릴산 이온교환체의 리튬이온에 대한 흡착량을 비교한 결과 본 연구에서 합성한 이온교환체의 흡착성이 우수한 것으로 나타났다.

• 한국응용과학기술학회지
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• 제6권1호
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• pp.1-7
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• 1989

To developed new process for obtaining maximum molecular weight of anionic acrylamide and acrylic acid copolymer by inverse emulsion polymerization. Concentration of initiator, reducing agent, surfactant and mole ratio of acrylamide-acrylic acid were studied for the process. Semi-batch processes with method of redox, control of reaction temperature, feeding method of monomer and reaction time, was suitable for maximum molecular weight of P(AMAC) from this process obtained $3.09\;{\time}\;10^6({\bar{M}}n.)$ and $4.41\;{\time}\;10^6({\bar{M}}w.)$ in molecular weight measured by the intrinsic viscosity method. inverse emulsion polymerization mechanism of P(AMAC) does not followed the Smith-Ewart and Medvedev theory, but selected for concentration of initiator, reducing agent, surfactant, water solubility of monomer.

• Environmental Engineering Research
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• 제24권1호
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• pp.173-179
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• 2019

Prussian blue (PB) is known to be an effective material for radioactive cesium adsorption, but its nano-range size make it difficult to be applied for contaminated water remediation. In this study, a simple and versatile approach to immobilize PB in the supporting matrix via surface functionalization was investigated. The commercially available poly vinyl alcohol (PVA) sponge was functionalized by acrylic acid (AA) to change its major functional group from hydroxyl to carboxylic, which provides a stronger ionic bond with PB. The amount of AA added was optimized by evaluating the weight change rate and iron(III) ion adsorption test. The FTIR results revealed the surface functional group changing to a carboxyl group. The surface functionalization enhanced the attachment of PB, which minimized the leaching out of PB. The $Cs^+$ adsorption capacity significantly increased due to surface functionalization from 1.762 to 5.675 mg/g. These findings showed the excellent potential of the PB-PAA-PVA sponge as a cesium adsorbent as well as a versatile approach for various supporting materials containing the hydroxyl functional group.

• Nuclear Engineering and Technology
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• 제4권2호
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• pp.90-101
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• 1972

Polyester 직포 표면을 친수화하기 위하여 함침법에 의하여 acrylic acid를 방사선 graft 공중합시켰다. 이때 함침된 직포를 질소에서 Co-60감마선으로 조사하였다. 생성된 Homopolymer는 10$0^{\circ}C$의 물에 의하여 대체로 유출되었다. Graft된 직포는 산성, 염기성 또는 분산염료에 대하여 재래식 저온 침염법에 의해서 염색이 잘 되었다.