• Title, Summary, Keyword: amphiphilic polymer

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Preparation of Valuable Compounds Encapsulated Polymer Nanoparticles with High Payload Using Core-crosslinked Amphiphilic Polymer Nanoparticles (코아 가교 양친성 고분자 나노입자를 이용한 고함량 유용 약물 담지 고분자 나노입자 제조)

  • Kim, Nahae;Kim, Juyoung
    • Applied Chemistry for Engineering
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    • v.27 no.1
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    • pp.26-34
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    • 2016
  • In this study, core-crosslinked amphiphilic polymer (CCAP) nanoparticles prepared using a reactive amphiphilic polymer precursor (RARP) were used for preparing some valuable compounds encapsulated polymer nanoparticles with high payload through nanoprecipitation process. Various solvents (acetone, ethanol, and THF) having different polarity and CCAP nanoparticles prepared using different amphiphilicity were used for the preparation of ${\alpha}$-tocopherol encapsulated polymer nanoparticles to investigate their effects on the encapsulation efficiency, payload, nanoparticle size, and stability. CCAP dissolved in hydrophobic solvent, THF, could form ${\alpha}$-tocopherol encapsulated polymer nanoparticles dispersed in water with the high payload of ${\alpha}$-tocopherol and encapsulation efficiency. Because of their physically and chemically robust nano-structure originated from crosslinking of the hydrophobic core, CCAP nanoparticles could encapsulate ${\alpha}$-tocopherol with the high payload (33 wt%) and encapsulation efficiency (97%), and form 70 nm-sized stable nanoparticles in water.

A Facile Synthesis of Discoidal Lipid Bilayer Nanostructure by Association of a Cationic Amphiphilic Polyelectrolyte

  • Cho, Eun-Chul
    • Bulletin of the Korean Chemical Society
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    • v.33 no.7
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    • pp.2187-2192
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    • 2012
  • This study presents a facile way synthesizing disc-like lipid bilyaer nanostructures with a cationic amphiphilic polyelectrolyte. The cationic amphiphilic polyelectrolyte was in a form of partially quarternized copolymer and was synthesized with 2-(dimethylamino)ethyl methacrylate and stearyl methacrylate. At some concentration ranges of the polymer, the addition of the polymer to lipid components during the preparation of bilayer nanostructures resulted in discs with a fairly high yield (~99%). The mechanism for the formation of the nanostructures was discussed based on the physical properties of these nanostructures and by comparing the nanostructures obtained with an anionic amphiphilic polyelectrolyte.

Preparation of Polymer Composites Containing Gold Nanonetworks Using an Amphiphilic Poly(oxyethylene) Brush

  • Cha, Sang-Ho;Kim, Jong-Uk;Lee, Jong-Chan
    • Macromolecular Research
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    • v.16 no.8
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    • pp.711-716
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    • 2008
  • We synthesized gold nanonetwork using the amphiphilic polymer brush, poly(oxyethylene) containing decyltri(oxyethylene)thiomethyl ($C_{10}H_{21}(OCH_2CH_2)_3SCH_2-$) side groups, as a stabilizer and/or a template. When tetrabutylammonium borohydride solution in THF was added to a mixture solution of the polymer and $LiAuCl_4$ in THF, 0-D gold nanomaterials were obtained. However, when an aqueous solution of sodium borohydride was added, gold nanonetworks were synthesized. The composites composed of polymer/0-D gold nanomaterials and polymer/gold nanonetworks showed electrical conductivities of ${\sim}10^{-9}$ and ${\sim}10^{-3}S/cm$, respectively, which indicated that the gold nanonetworks increased the electrical conductivity.

Colloidally stable organic-inorganic hybrid nanoparticles prepared using alkoxysilane-functionalized amphiphilic polymer precursors and mechanical properties of their cured coating film

  • Kim, Nahae;Li, Xinlin;Kim, Se Hyun;Kim, Juyoung
    • Journal of Industrial and Engineering Chemistry
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    • v.68
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    • pp.209-219
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    • 2018
  • Colloidally stable organic-inorganic (O-I) hybrid nanoparticles could be prepared using an alkoxysilanefunctionalized amphiphilic polymer (AFAP) precursor. O-I hybrid sols could maintain colloidal stability for six months even at 45% solid content and be coated onto glass as well as PET film to form transparent O-I hybrid films. The formation of O-I hybrid nanoparticles dispersed in cured coating films could be confirmed using scanning electron microscopy. The cured coating film showed 3H and 5H pencil hardness on PET and glass, respectively. Nanoindentation measurements also showed that their modulus and hardness was varied with the type of AFAP used in its preparation.

Use of Core-Crosslinked Amphiphilic Polymer Nanoparticles as Templates for Synthesis of Nanostructured Inorganic Materials (코아 가교 양친성 고분자 나노입자 템플레이트를 이용한 무기물 나노 구조체 합성)

  • Kim, Hyun-Ji;Kim, Na-Hae;Kim, Juyoung
    • Journal of Adhesion and Interface
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    • v.16 no.1
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    • pp.6-14
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    • 2015
  • In this study, physically and chemically stable core-crosslinked amphiphilic polymer (CCAP) nanoparticles were prepared using amphiphilic reactive precursors via soap-free emulsion process. Obtained CCAP nanoparticles were used as templates for synthesis of nanostructured $TiO_2$ nanoparticles. First, CCAP nanoparticles dispersed aqueous solutions were mixed with titanium isopropoxide to prepare stable organic-inorganic hybrid sols, and then obtained sols were spin coated onto glass substrate to prepare hybrid thin films onto glass, and then hybrid thin films were calcinated at various temperature to remove CCAP. Nanostructure of calcinated thin fims were examined by SEM. To study effect of CCAP nanoparticles on nanostructure of $TiO_2$ nanoparticles, the morphology of $TiO_2$ nanoparticles prepared using various CCAP templates was compared with that of $TiO_2$ nanoparticles prepared using conventional organic template, nonionic surfactant, Triton X-100.

Synthesis and Solution Properties of Fluorinated Amphiphilic Polyacrylamide (불화계 양친매성 폴리아크릴아마이드의 합성과 용액거동)

  • Zhao, Fangyuan;Du, Kai;Yi, Zhuo;Du, Chao;Fang, Zhao;Mao, Bingquan
    • Polymer(Korea)
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    • v.39 no.3
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    • pp.403-411
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    • 2015
  • A series of hydrophobically associating fluorinated amphiphilic polyacrylamide copolymers with remarkably high heat resistance and salt tolerance were synthesized by free radical micellar copolymerization, using acrylamide (AM) and sodium 2-acrylamido-tetradecane sulfonate ($AMC_{14}S$) as amphiphilic monomers, and 2-(perfluorooctyl) ethyl acrylate (PFHEA) as hydrophobic monomer. The structure of the terpolymer was characterized by FTIR, $^1H$ NMR and $^{19}F$ NMR. The solution properties of the terpolymers were investigated in details, and the results showed that the terpolymer solution had strong intermolecular hydrophobic association as the concentration exceeded the critical association concentration 1.5 g/L. The terpolymer solution possessed high surface activity, viscoelasticity, excellent heat resistance, salt tolerance and shearing resistance. The viscosity retention rate of copolymer solution was as high as 59.9% under the condition of fresh wastewater, $85^{\circ}C$ and a 60-days aging test.

Removal of Hydrophobic Contaminant using Amphiphilic Block Copolymer (양친성 블록공중합체를 이용한 소수성 오염원제거)

  • Lee, Junhyup;Shim, Jaeyoul;Kim, Younguk
    • Journal of the Korean GEO-environmental Society
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    • v.15 no.3
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    • pp.15-19
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    • 2014
  • Spilling pollutants and its contamination to the ground have serious impact to public resulting in various research about remediation techniques. In this study, the use of amphiphilic block copolymer for remediation was investigated with a series of laboratory tests on removal of hydrophobic contaminant in soil. Four types of amphiphilic block copolymer were developed and the efficiency of the cleaning was compared with surfactant using arbitrary diesel-contaminated soils. The results of the study show that the use of amphiphilic polymer in the soil washing process significantly enhanced the remediation of the contaminated soil and a potential of new methodology of eco-friendly remediation.