• 방사선산업학회지
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• 제4권4호
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• pp.341-345
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• 2010

The surface functionalization of a fluoropolymer by ion beam-induced graft polymerization was described in this research. The surface of poly(tetrafluoroethylene) (PTFE) films were irradiated by a 150 keV $H^+$ ions, and 4-vinyl pyridine (4VP) as a functional monomer was then thermally graft polymerized on the irradiated surface. The surface properties of poly(4-vinyl pyridine) (P4VP)-grafted PTFE films were investigated in terms of grafting degree, wettability, chemical structure, and morphology. The results revealed that the surface of PTFE films was successfully functionalized by ion beam-induced graft polymerization of 4VP.

• 방사선산업학회지
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• 제6권3호
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• pp.251-255
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• 2012

Pulp is typically used for paper industry to manufacturing various types of papers. However simply chemical modification makes enable the pulp to a wide range of application in various industrial fields. To bring the polymerization the gamma ray irradiated on the mixture of kenaf and PEGMA in various dose ranges from 20 to 60 kGy. As a results, the graft degree of 20.0% was obtained from 475 g of gamma ray irradiated pulp and PEGMA. After the polymerization, the chemical structure and morphology of the surfaces were examined by Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscope. Chemical structure of grafted pulp has significantly growth in carbonyl content with increasing the radiation dose. Also surface morphology was distinctly changed with decreased the degree of roughness and increasing the diameter. These results were explained gamma ray irradiation improve performance of graft polymerization efficiency.

• Macromolecular Research
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• 제11권3호
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• pp.146-151
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• 2003

The dependence of electrical conductivity on concentrations of diallyldimethylammonium chloride (DADMAC) monomer, linear poly(DADMAC) and their mixture monomer/poly(DADMAC) in dilute aqueous solution exhibits a linear relationship. It was possible to calculate conversion of DADMAC polymerization by measuring its electric conductivity. Although the electrical conductivity of the poly(DADMAC) solution decreased with increasing its molecular weight, in the process of UV or ionizing radiation polymerization the molecular weight of the polymers could be kept constant in the case of fixed temperature, UV-luminous intensity or dose rate. Based on the method mentioned above, the kinetics of UV induced polymerization of DADMAC in aqueous solution was studied; the overall activation energy of polymerization of DADMAC in the water phase was calculated to be 18.8 kJ mol$^{-1}$ . ${\gamma}$-Radiation-induced polymerization of DADMAC in aqueous solution as a function of absorbed dose was studied as well. The conversion of DADMAC increased quickly with dose before 30 kGy and then increased slowly. The experimental data of both UV- and ${\gamma}$-induced polymerization were verified to be reliable by inverted ultracentrifugation method.

• 폴리머
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• 제34권2호
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• pp.150-153
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• 2010

본 연구에서는 방사선에 의한 그래프트 중합을 이용하여 생체분자가 고정화된 다중벽탄소나노튜브 (MWCNT)를 제조하였다. 생체분자의 고정화를 위하여 MWCNT에 아크릴 산을 그래프트 중합하였다. 열중량분석과 라만 분석을 통하여 MWCNT에 폴리(아크릴 산)이 효과적으로 그래프트 중합되었음을 확인하였다. 폴리(아크릴 산)이 그래프트 된 MWCNT에 DNA와 단백질과 같은 생체분자들을 고정화하였다. X-선 광전자 분광법과 형광분석을 통하여 생체분자들이 성공적으로 MWCNT에 도입되었음이 확인되었다.

• 한국막학회:학술대회논문집
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• 한국막학회 2004년도 추계 총회 및 학술발표회
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• pp.199-203
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• 2004

Fibrous arsenic (As) adsorbent was synthesized by loading zirconium (Zr) on fibrous phosphoric adsorbent that was directly synthesized by radiation-induced graft polymerization of 2-hydroxyethyl methacrylate phosphoric acid on polyethylene-coated polypropylene nonwoven fabric. Zirconium reacted with phosphoric acid grafted in the polyethylene layer. Zirconium density of the resulting adsorbent was 4.1 mmol/g. The breakthrough curve of As(V) adsorption was independent of the flow rate up to $1300\;h^{-1}$ in space velocity. The total capacity of As(V) was 2.0 mmol/g-adsorbent at pH of 2. The adsorbed Zr(IV) could be evaluated by 0.4 M sodium hydroxide solution because negligible Zr(IV) could be found in the eluted solution.

• 방사선산업학회지
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• 제6권4호
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• pp.317-322
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• 2012

In this study, the preparation of a temperature-responsive poly(N-isopropylacrylamide) (PNIPAAm)-grafted surface was performed using an eco-friendly and biocompatible ion beam-induced surface graft polymerization. The surface of a perfluoroalkoxy (PFA) film was activated by ion implantation and N-isopropylacrylamide (NIPAAm) was then graft polymerized selectively onto the activated regions of the PFA surfaces. Based on the results of the peroxide concentration and grafting degree measurements, the amount of the peroxide groups formed on the implanted surface was dependant on the fluence, which affected the grafting degree. The results of the FT-IR-ATR, XPS, and SEM confirmed that the NIPAAm was successfully grafted onto the implanted PFA. Moreover, the contact angle measurement at different temperatures revealed that the surface of the PNIPAAm-grafted PFA film was temperature-responsive.

• 폴리머
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• 제31권6호
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• pp.512-517
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• 2007

[ $Co_{60}\;{\gamma}-ray$ ] 방사선 조사법을 이용하여 kapok 섬유에 styrene, glycidylmethacrylate(GMA) 또는 acrylic acid(AAc)를 그래프트 공중합 반응하여 합성한 공중합체의 그래프트율은 단량체의 농도와 방사선 조사량에 따라 증가하는 것으로 나타났으며, 또한 합성된 이온교환 섬유의 도입된 관능기를 확인하고 이온교환 능을 측정하였으며, SEM과 FT-IR을 통하여 이온교환 섬유의 표면과 구조를 분석하였다.

• 공업화학
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• 제19권3호
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• pp.345-350
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• 2008

고분자함침콘크리트(PIC)는 물리화학적 물성뿐만 아니라 기계적 강도가 우수한 재료로서 성형된 일반 콘크리트를 변조하여 제조한다. PIC 제조공정은 성형된 공시체의 건조, 단량체의 함침, 중합공정으로 구성된다. PIC 제조공정 중 고분자 중합공정은 지금까지 주로 열 및 수중중합방법을 사용하여 콘크리트 내부의 온도구배가 크고 라디칼 생성이 억제되어 불균일한 중합을 초래하였다. 본 연구에서는 마이크로파를 이용한 중합 반응기를 제작하여 스티렌/메틸메타아크릴레이트(MMA) 1 : 1의 혼합물을 단량체로 사용한 PIC 제조의 중합공정에 사용하였다. 그 결과 열중합보다 매우 균일한 PIC를 제조할 수 있었으며, 30% 이상 중합도가 증가하였고, 공시체보다 기계적 압축강도는 600% ($800{\sim}1200kg_f/cm^2$)까지 증가하였으며, 내산성은 20% 이상 증가하였다. 또한 개시제는 1% 이하로 사용할 수 있었고 중합의 최적 조건은 400 W, 2450 MHz의 radiation 조사로 최적 온도는 $120^{\circ}C$였다.

• 원자력산업
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• 제6권7호통권41호
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• pp.64-67
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• 1986

• Carbon letters
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• 제11권3호
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• pp.216-223
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• 2010

Two-types of ionically modified multi-walled carbon nanotube (MWNTs) based sensors were developed by radiationinduced graft polymerization using vinyl monomers such as 3-(butyl imidazol)-2-(hydroxyl)propyl methyl methacrylate and 1-[(4-ethenylphenyl)methyl]-3-buthyl-imidazolium chloride with ionic properties, in aqueous solution at room temperature. Subsequently, the tyrosinase-immobilized biosensor was fabricated by a hand-casting of the ionic property-modified MWNTs, tyrosinase, and chitosan solution as a binder onto ITO glass surface. The sensing ranges of the tyrosinase-biosensor for phenol in phosphate buffer solution was in the range of 0.005~0.2 mM. The total phenolic compounds mainly such as caffeine of the tyrosinase-immobilized biosensor for commercial coffee were also determined.