• Macromolecular Research
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• 제17권6호
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• pp.397-402
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• 2009

In emulsifier-free, emulsion polymerization with ionizable comonomer, the ionization of the comonomer is critical in determining the size of the final polymerie particles at sub-micrometer scale. In this study, polystyrene latex beads with carboxylates on the surface were synthesized using acrylic acid as a comonomer. Specifically, ammonium hydroxide was added to the emulsifier-free polymerization system to promote the ionization of acrylic acid by increasing pH. Smaller polystyrene latex particles were produced by increasing the ammonium hydroxide concentration in the reaction system, due to the enhanced stability promoted by the ionization of acrylic acid during the nucleation step. In addition, the surface morphology of the polystyrene latex particles was controlled by the concentration of acrylic acid, the dissociation of which was influenced by the ammonium hydroxide concentration.

• 정보학연구
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• 제7권1호
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• pp.105-110
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• 2004

본 연구에서는 수성페인트의 주원료인 안료와 전색재료인 아크릴계수지를 사용하여 수성페인트를 제조한 후 기초물성을 측정하고, 아크릴계 수성페인트에 환경친화적인 honey flavor 향료를 첨가시켜 도막을 형성시킨 후 관능검사 및 향의 지속성 여부를 조사하였다.

• 폴리머
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• 제29권5호
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• pp.463-467
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• 2005

Fluoroalkyl methacrylate, 아크릴산, 2-hydroxyethyl methacrylate(HEMA)를 공중합한 불소화 아크릴계 이온성 고분자로 제조한 이온성 고분자-백금 복합재료(IPMC)의 구동력을 증대시키기 위하여, HEMA의 OH기를 1,3-diethoxy-1,1,3,3-tetramethyldisiloxane으로 가교하였다. 가교반응에 의하여 IPMC의 수분흡수가 감소하면서, 기계적 강도, 구동력이 증가함을 관찰하였다. 그러나 IPMC의 구동성, 즉 외부 전위에 의한 변위와 전류량은 가교에 의해 감소하였다.

• 한국염색가공학회지
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• 제11권3호
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• pp.41-48
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• 1999

The removal of hemoglobin from acrylic acid grafted Nylon fabrics has been investigated. In order to change detergency of Nylon 6 fabric, acrylic acid(AA) were graft copolymerized on Nylon fabric using ammonium persulfate(APS) as a initiator, and then acrylic acid grafted Nylon was treated with NaOH solution. The graft ratio increased linearly with increasing acrylic acid concentration. The graft ratio was the highest when the concentration of APS was 0.05%, and it decreased as the concentration of APS increased. The surface of Nylon fabric became rough due to graft. Moisture regain was increased by graft and alkaline treatment, contact angle was also improved compared with the ungrafted. The hemoglobin was easily solubilized and removed from grafted Nylon fabric, while it was difficult to remove hemoglobin from ungrafted Nylon fabric. The effects of graft on removal of hemoglobin was related with increase of moisture regain and transformation of COOH to COONa by alkaline treatment.

• 한국응용과학기술학회지
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• 제16권4호
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• pp.287-291
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• 1999

Plasma polymerization of Perfluoropropene(PFP) was carried out in a tubular type reactor. The Plasma was generated by coupling inductively under the fixed discharge power of 25W and the pressure of 100, 140, and 200 mTorr of radio frequency generator. PFP plasma polymerization thin films were deposited in acrylic yams. For 1 hours, the acrylic yams treated and untreated by PFP plasma were immersed in boiling water. Then the reduction of contraction coefficient of acrylic yams were measured respectively. As a result of this experiment, untreated acrylic yams were reduced around 23%, while treated yams were contracted about 18-2%.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.72-73
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• 2021

For the development of high-fluidity concrete using low-binder, The effect of the use of the developed acrylic viscosity agent on the physical properties of concrete evaluated. The amount acrylic viscosity agent used was 1.5%, 1.7%, and 2.0% based on the binder amount of 400kg/m3, and slump flow test, slump flow 500mm arrival time measurement, air volume measurement, and U-Box passing test were conducted to determine the effect of the physical properties of concrete. it was judged that 1.5% of the acrylic viscosity agent used in high-fluidity concrete using low-binder was most suitable.

• 폴리머
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• 제32권4호
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• pp.313-321
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• 2008

UV개시에 의해 광경화형 아크릴 공중합체를 합성하고 제조된 아크릴 점착제(PSA)의 박리 에너지와 물리적 특성을 조사하였다. 이때 acrylic acid(AA)의 함량을 변화시켜 점착제의 물성을 변화시켰으며, 피착제의 표면 거칠기, 표면 요철방향, 점착제의 두께를 변화시킴으로써 박리 에너지의 변화 추이를 조사하였다. 공단량체인 acrylic acid의 함량이 증가함에 따라 표면 거칠기가 낮은 피착제가 높은 박리 에너지를 보였으며 점착제의 두께가 두꺼워 질수록 증가하였다. 또한 피착제 표면의 요철방향이 박리방향과 수평일 때 특히 높은 박리 에너지를 갖는 것으로 나타났다. 이것은 점착제의 두께 감소와 피착제 표면 거칠기의 증가가 wetting의 감소를 초래하지만 박리 시 저항력은 오히려 증가하는 경향을 나타내기 때문일 것이라는 예상과도 잘 일치한다.

• Journal of Microbiology and Biotechnology
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• 제21권1호
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• pp.37-42
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• 2011

A new versatile acrylonitrile-bioconverting strain isolated from a petroleum-contaminated sludge sample and identified as Rhodococcus ruber AKSH-84 was used for optimization of medium and biotransformation conditions for nitrilase activity to produce acrylic acid. A simple and rapid HPLC protocol was optimized for quantification of acrylic acid, acrylamide, and acrylonitrile. The optimal medium conditions for nitrilase activity were pH of 7.0, temperature of $30^{\circ}C$, agitation of 150 rpm, and inoculum level of 2%. Glycerol as a carbon source and sodium nitrate as the nitrogen source provided good nutritional sources for achieving good biotransformation. Nitrilase activity was constitutive in nature and was in the exponential growth phase after 24 h of incubation under optimal conditions without addition of any inducer. The substrate preference was acrylonitrile and acetonitrile. The present work demonstrates the biotransformation of acrylonitrile to acrylic acid with the new strain, R. ruber AKSH-84, which can be used in green biosynthesis of acrylic acid for biotechnological processes. The nitrilase produced by the isolate was purified and characterized.

• 한국염색가공학회지
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• 제8권6호
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• pp.40-46
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• 1996

In order to investigate a practical application of fibrous absorbents to transition metals such as copper, nickel, cobalt, chrome, and iron, amidoximated fiber as a particular class of solid chelate agents were prepared from acrylic fibers treatment with hydroxylamine. The adsorption mechanisms of metal ions onto amidoximated acrylic fibers and their complexes were studied. Amidoximation of acrylic fiber with hydroxylamine is found to be first-order reaction, followed by the disappearance of infrared adsorption peaks due to nitrile groups of acrylic fibers. The uptake of metal ions onto amidoximated acrylic fiber is increased with temperature raising and the adsorption is also depended on pH of the soiutions. About 70% of metal ions can be recovered from aqueous solutions of Ni(II), Co(II), Cr(III), and Fe(II) on the concentration below 5x 10$^$^{-4}$ in the range of pH 2.1~10.0. Transition metals are adsorbed to form complex with amidoxime group by the ligand sites such as C=N, NH, NO, NHOH.OH.

• 공업화학
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• 제7권4호
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• pp.679-690
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• 1996

긴 탄화수소를 함유한 alkylmethacrylate와 2-dimethylaminoethyl methacrylate로부터 아크릴공중합체를 합성하고, 물에 쉽게 유화시키기 위하여 아세트산으로 양이온화하여 아세트화 아크릴공중합체를 합성하였다. 아세트화 아크릴공중합체는 물에 완전히 유화가 가능하였고, 물에대한 유화 안정성이 증진되었다. 위에서 합성한 아세트화 아크릴 공중 합체에 sodium gluconate, oleic acid, triethanolamine을 브렌딩하여 시멘트 혼화용 폴리머(PDCM-PSD)를 제조하였다. 제조된 시멘트 혼화용 폴리머를 가지고 응용실험을 한 결과 우수한 분산, 방수효과(0.3~0.5)를 확인하였다.