• Title/Summary/Keyword: polymer aqueous solution

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Evaluation of Early Strength of Red Clay Soil with Polymer Aqueous Solution (폴리머수용액을 첨가한 황토의 초기강도 평가)

  • Kim, Jin-Sung;Lee, Bo-Kyeong;Lee, Dong-Eun;Choi, Hyeong-Gil
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.11a
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    • pp.145-146
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    • 2019
  • In this study, we evaluated the early strength of red clay soil with the polymer aqueous solution at rammed earth construction. In order to satisfy the demolding strength of the formwork be due to the rammed of red clay soil, the polymer aqueous solution was added to evaluate the compressive strength at the early age according to the consolidation level. As a result, a high compressive strength was exhibited with the formulation to which the polymer aqueous solution was added.

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Morphology Characteristics of Insulating Laser based on Aqueous Polymer Resin Fabricated by Ultrasonic Spray Coating Process (수성 폴리머 도료를 이용한 초음파 스프레이 공정으로 형성된 폴리머 절연층 미세구조 특성)

  • Yu, Jeong-Mo;Park, Chae-Won;Eom, Hyeon-Jin
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2016.11a
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    • pp.136-136
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    • 2016
  • Commonly used oil-based polymer resin has environmental and safety issues. Many researches for replacing the harmful solvent-borne resins to water-borne resins have been investigated to purify harmful environmental resources and follow the export and import of hazardous materials regulations. In this research, ultrasonic spray coatings of aqueous polymer resin were studied to fabricate thin insulating layer (${\sim}{\mu}m$) on the rectangular copper wire. It needs to have appropriate wettability between resin and substrate during the ultrasonic spray coating process to coat aqueous polymer uniformly. Furthermore, stabilities of coating solution and fabricating process are required to form thin insulating layer on the substrate. In here, physical characteristics such as viscosity of 6 types of commercial polymer dispersions and emersions were analyzed to confirm compatibility for ultrasonic spray coating process. These resins were dissolved in isopropyl alcohol, used for true solvent, and were diluted with ethanol, utilized for diluent. Also, solubilities, dispersion characteristics, and viscosities of these diluted polymer resin solutions were confirmed. Dispersion characteristic and viscosity of coating solution affects jetting of ultrasonic spray coating and these jetting characteristics influence morphologies of insulating layer. In conclusion, we have known that aqueous polymer solution should have outstanding dispersion characteristic and certain range of viscosity to fabricate thin polymer insulating layer uniformly with ultrasonic spray coating.

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Quenching of Water Soluble Conjugated Polymer by Electrostatic Interaction

  • Jin, Youngeup
    • Bulletin of the Korean Chemical Society
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    • v.33 no.11
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    • pp.3593-3596
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    • 2012
  • The water-soluble conjugated polymer with fluorescence quenching as a result of electrostatic interaction and aggregation was synthesized through Suzuki polymerization. The absorption and emission of anionic polymer (a-PFP) is blue shifted as compared with cationic polymer (c-PFP) although getting same backbone, and the absolute PL quantum efficiency of a-PFP in water is over 90% due to good solubility in aqueous solution. We anticipate that the fluorescence quenching of anionic and cationic polymers, with same conjugated backbone, could be shown in aqueous solution.

The Performance Evaluation of Red Clay Binder with Polymer Aqueous Solution (고분자수용액을 첨가한 황토 결합재의 성능 평가)

  • Kim, Jin-Sung;Kim, Ho-Jin;Choi, Hyeong-Gil
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.11a
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    • pp.141-142
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    • 2020
  • In this study, the performance evaluation was performed by adding a polymer aqueous solution as a new additive of the red clay binder for use in the rammed earth construction method. The evaluation items were compressive strength and microstructure analysis. As a result of the experiment, the performance of the red clay binder was improved by efficiently bonding the silica particles by the polymerized polymer.

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Fluorescent Silk Fibroin Nanoparticles Prepared Using a Reverse Microemulsion

  • Myung, Seung-Jun;Kim, Hun-Sik;Kim, Yeseul;Chen, Peng;Jin, Hyoung-Joon
    • Macromolecular Research
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    • v.16 no.7
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    • pp.604-608
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    • 2008
  • Color dye-doped silk fibroin nanoparticles were successfully fabricated using a microemulsion method. An aqueous silk fibroin solution was prepared by dissolving cocoons (Bombyx mori) in a concentrated lithium bromide solution followed by dialysis. A color dye solution was also mixed with the aqueous silk fibroin solution. The surfactants used for the microemulsion were then removed by methanol and ethanol, yielding color dye-doped silk fibroin nanoparticles, approximately 167 nm in diameter. The secondary structure of the nanoparticles showed a $\beta$-sheet conformation, as characterized by Fourier transform infrared spectroscopy. The morphology of the nanoparticles was determined by field emission scanning electron microscopy, transmission electron microscopy and atomic force microscopy, and their size and size distribution were measured by dynamic light scattering. The color dye-doped silk fibroin nanoparticles were examined by confocal laser scanning microscopy.

Interaction between Poly(L-lysine) and Poly(N-isopropyl acrylamide-co-acrylic acid) in Aqueous Solution

  • Sung, Yong-Kiel;Yoo, Mi-Kyong;Cho, Chong-Su
    • Macromolecular Research
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    • v.8 no.1
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    • pp.26-33
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    • 2000
  • A series of pH/temperature sensitive polymers were synthesized by copolymerizing N-isopro-pyl acrylamide(NIPAAm) and acrylic acid(AAc) . The influence of polyelectrolyte between poly(allyl amine) (PAA) and poly(L-lysine)(PLL) on the lower critical solution temperature(LCST) of pH/temperature sensitive polymer was compared in the range of pH 2∼12. The LCST of PNIPAAm/water in aqueous poly(NIPAAm-co-AAc) solution was determined by cloud point measurements. A polyelectrolyte complex was prepared by mixing poly(NIPAAm-co-AAc) with poly(allyl amine) (PAA) or poly(L-lysine) (PLL) solutions as anionic and cationic polyelectrolytes, respectively. The effect of polyelectrolyte complex formation on the conformation of PLL was studied as a function of temperature by means of circular dichroism(CD). The cloud points of PNIPAAm in the aqueous copolymers solutions were stongly affected by pH, the presence of polyelectrolyte solute, AAc content, and charge density. The polyelectrolyte complex was formed at neutral condition. The influence of more hydrophobic PLL as a polyelectrolyte on the cloud point of PNIPAAm in the aqueous copolymer solution was stronger than that of poly(allyl amine)(PAA). Although polymer-polymer complex was formed between poly(NIPAAm-co-AAc) and PLL, the conformational change of PLL did not occur due to steric hinderance of bulky N-isopropyl groups of PNIPAAm.

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The Chemical Resistance of Polymer Cement Slurry Coated Reinforcing Bars (폴리머 시멘트 슬러리 도장철근의 내약품성)

  • 김현기;장성주;김완기;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.1121-1126
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    • 2000
  • The purpose of this study is to clarify chemical resistance of polymer-cement slurry coated reinforcing bars. Polymer cement slurry coated reinforcing bars were showed the good state to the bending resistance, impact resistance, adhesive strength, but exact data of the chemical resistance do not exist. Through the experimental, it is to certify chemical resistance of polymer cement slurry coated reinforcing bars. In this study, polymer cement slurry coated reinforcing bars are prepared with two types of polymer, polymer-cement ratios of 50%, 100%, 150%, coating thickness, curing periods of 3, 7, 28days, and tested for chemical resistance as KS(Korea Standard). From the test results, chemical resistance of polymer cement slurry coated reinforcing bars used by acrylic and St/BA emulsion were showed excellent without concerned polymer-cement ratios, curing period except for 1% aqueous solution $H_2SO_4$. But polymer cement coated reinforcing bar used by acrylic emulsion is inferior to aqueous solution NaOH.

Effect of Rheological Properties on the Sedimentation of Capsules in an Aqueous Polymer Solution (고분자 수용액의 레올러지 특성이 캡슐의 침강에 미치는 영향)

  • Kim, Dong-Joo;Kim, Jung-Ah;Kyong, Kee-Yeol;Yoon, Moung-Suk
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.31 no.1 s.49
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    • pp.85-89
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    • 2005
  • An aim of this study is to study the correlation between rheological properties and sedimentation of capsules in aqueous polymer solution with low viscosity. Rheological properties of aqueous polymer solutions were controlled by carbomer (C), acylate/C10-30 alkyl acylate crosspolymer (AC), and ammonium acryloyldimethyltaurate/VP copolymer (AV). Small amount of polymer C solution had the highest viscosity and yield stress of polymer AV solution was higher than that of polymer C solution in the same viscosity when the concentration of polymer AV exceeded $0.35 wt\%$. Each aqueous polymer solution was tested and the results showed that as viscosity and yield stress increased, the sedimentation ratio of capsules decreased. The viscoelasticity data also showed the same tendency in a shear stress range of 0.1 to 2.0 Pa. These results demonstrated that the rheological properties of polymer solutions had a strong correlation with the sedimentation of capsules. When polymer I and AV were used, there was a synergistic effect and the correlation between rheological properties and sedimentation of capsules was very complicated. It was assumed that the characteristics of polymer structure and interaction between polymers caused this phenomena.

A flow characteristic of non-newtonian fluid in coutte flow of concentric cylinder (동심원통속의 Coutte flow에 있어서 비 Newton 유체의 유동특성)

  • 권혁칠;이성노;부전유사
    • Journal of the korean Society of Automotive Engineers
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    • v.14 no.3
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    • pp.109-114
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    • 1992
  • The purpose of this study is to experimentally research the effects of polymer additives on turbulent transition of Couette flow between concentric cylinders when outer one is rotating and inner one is at rest; the diameter ratio being 0.2. Aqueous polymer solution generate the degradation phenomena in machine forming work, but this is not effected in about 10 minute at 5ppm. aqueous polymer solution testing. The Reynolds number, referred to the gap distance and rotation velocity of the outer cylinder, of turbulent transition is about 20000 for water flow. In the laminer region, the torque value is as same as theoretical one in the region of low Reynolds number, but becomes high with an increase in the Reynolds number. The polymer additives reduce the Reynolds number for turbulent transtition. In the turbulent region, the torque is remarkably reduced by the polymer additives, soluble polymer take down effect of turbulent transition boundary torque.

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Study on the Preparation of Alginic Acid-PMMA Graft Polymer and the Surface Modification of Montmorillonite with the Graft Polymer (Alginic Acid-PMMA Graft Polymer의 합성 및 이를 Coupling제로 한 Montmorillonite 표면의 개질화에 관한 연구)

  • 손차호;김경환;박천욱
    • Textile Coloration and Finishing
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    • v.4 no.4
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    • pp.81-89
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    • 1992
  • Graft polymers of alginic acid-PMMA, different in composition and Mv of branched PMMA, were prepared by emulsion graft polymerization at various MMA concentrations. In aqueous dispersion solution, the adsorption of graft polymer on the montmorillonite was carried out to modify the surface property of powder, and the adsorption of PMMA in organic solvents (acetone, benzene) on the modified surface of powder were observed. The results obtained were as follows. 1. In emulsion graft polymerization of MMA on the sodium alginate in aqueous solution, SA conversion, MMA conversion and % grafting were increased with increasing MMA concentration where as graft efficiency was decreased. 2. The adsorption amount of graft polymer was increased with the elevation of temperature and the increased of dispersion concentration and with the increase of branched PMMA composition of graft polymer. 3. In organic solvent, the adsorption of PMMA on the surface modified particle was proceeded by the orientation along the stretched branched PMMA of adsorbed graft polymer which is in radial direction to the particle surface. 4. The adsorbed amount of PMMA was increased as the temperature and concentration of PMMA solution, the branching of adsorbed graft polymer and the solvency of solvent were increased.

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