• Title/Summary/Keyword: perfluoropolyether(PFPE)

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Degradation Characteristics of Perfluoropolyether Lubricant for Computer Hard Disk (컴퓨터 하드디스크 윤활제로 사용되는 Perfluoropolyether의 분해거동)

  • Lee, Ji-Hye;Chun, Sang-Wook;Kang, Ho-Jong
    • Polymer(Korea)
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    • v.31 no.4
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    • pp.278-282
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    • 2007
  • The degradation characteristics of perfluoropolyether (PFPE) for computer hard disk drive have been investigated. Thermal degradation in PFPE started at $170\;^{\circ}C$ and it was completed at $450\;^{\circ}C$. If PFPE was contacted with wear fragment from slider made by $Al_2O_3{\cdot}TiC$, the thermal degradation was accelerated by the catalytic Lewis acid degradation. The Lewis acid degradation mainly took placed in methylene oride(fluoride) chain scission as well as methylene(fluoride) and hydroxy end chain. As a result, the degradation reaction accomplished as early as at $300\;^{\circ}C$. The photo oxidation due to UV exposure on PFPE caused the chain scission in methylene(fluoride), and end chain in PFPE without chain scission in methylene oxide(fluoride) and then the molecular weight of PFPE increased by expected secondary reactions between formed radicals in the photo oxidation.

Study on Anti-biofouling Properties of the Surfaces Treated with Perfluoropolyether (PFPE) (Perfluoropolyether (PFPE)로 처리된 표면의 생물오손 방지 특성 연구)

  • Park, Sooin;Kwon, Sunil;Lee, Yeongmin;Koh, Won-Gun;Ha, Jong Wook;Lee, Sang-Yup
    • Applied Chemistry for Engineering
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    • v.23 no.1
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    • pp.71-76
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    • 2012
  • Biofouling by marine organisms such as algae and barnacles causes lots of significant problems in marine systems such as a rise of the maintenance-repair cost for the ship and the marine structures. In this work, a fluoropolymer, perfluoropolyether (PFPE), was applied as an anti-biofouling coating material that prevents the adhesion of marine organisms and facilitates the removal of them. Water contact angles of various surfaces were tested to examine the hydrophobicity of the PFPE-modified surface. The PFPE-modified surface showed the water contact angle of $64.5^{\circ}$ which is a remarkable rise from $46.7^{\circ}$ of amine-treated surface. When the substrate was treated with PFPE, the adhesion on the of the barnacle and other marine organisms were repressed around 15% by the enhanced hydrophobicity. In addition, the removal the of the adhered marine organisms were better comparing to that of the surface prepared by PDMS. Surfaces of the substrate treated by PFPE were characterized through physical and chemical methods to analyze the biofouling results. Degree of biomolecular adhesion to the substrate was quantified by the measurement the fluorescence intensity of marine organisms dyed with green fluorescence. PFPE is expected to be applicable not only to anti-biofouling systems but also to medical devices where the prevention of protein adhesion is required.

Synthesis and Surface Characteristics of Novel Oligomeric Silane with Perfluoropolyether (과불소 폴리에테르 포함 새로운 실란형 올리고머의 합성과 표면 특성)

  • Park, Eun-Young;Lee, Sang-Goo;Ha, Jong-Wook;Park, In-Jun;Lee, Soo-Bok;Lee, Yong-Taek
    • Polymer(Korea)
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    • v.32 no.4
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    • pp.397-402
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    • 2008
  • Perfluoropolyether(PFPE) has been widely applied in industry because of its very excellent properties of very high contact angle and low surface energy, good lubricant property and antifouling property. But the difficulty to synthesize PFPE has limited the research on this field. In this study, the novel silicon-containing oligomer with perfluoropolyether moiety was synthesized, and the structure was characterized by $^{19}F$-NMR and $^1H$-NMR. The surface properties of contact angle, sliding angle, and soil release property were investigated. The results show that PFPE in this study can be utilized as an anti-smudge coating material because it shows lower sliding angle and better soil release property than commercial products.

Lewis Acid Degradation Characteristics of Perfluoropolyethers Derivatives (퍼프로로폴리에테르 유도체의 루이스 산 분해특성)

  • Chun, Sang-Wook;Kang, Ho-Jong
    • Polymer(Korea)
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    • v.38 no.5
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    • pp.650-655
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    • 2014
  • The degradation characteristics of perfluoropolyether (PFPE) derivatives currently being used as computer hard disk lubricants have been investigated. Especially, we considered the effects of end group on degradation behavior of PFPE derivatives. It was found that the degradation of PFPE derivatives in the presence of $Al_2O_3$ involves two degradation mechanisms such as thermal degradation and Lewis acid disproportionation by $AlF_3$ which was mainly formed by oxide-to-halide reaction between $Al_2O_3$ and the degraded PFPE. The end groups were strongly related to Lewis acid disproportionation of PFPE derivatives, and it is due to the difference of electron donating ability in the each end groups. Even if PFPE derivatives have same repeating unit in the main chain, Lewis acid disproportionation was prohibited by higher electron donating ability by the end group which caused the high electron density at the acetal group in the repeating unit.

HYDROPHILICALLY AND LIPOPHILICALLY MODIFIED PERFLUOROPOLYETHERS AS INGREDIENTS OF NON-CONVENTIONAL COMPOSITIONS

  • Giovanni Pantini;Rossellr Ingoglia;Solvay Solexis
    • Proceedings of the SCSK Conference
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    • 2003.09a
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    • pp.327-337
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    • 2003
  • In recent years, the chemical modification of polymers has been a driving force in many industrial sectors. There was evidence that this might also be the case of perfluoropolyethers (PFPEs) in the personal care industry. To investigate this potential, a systematic study has been conducted at Solvay Solexis SpA (formerly Ausimont SpA), through the analysis of the organic chemistry suitable to modify PFPE structures, and through the examination of the properties of PFPE derivatives thus produced from the viewpoint of a cosmetic formulator.(omitted)

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Fabrication of Superhydrophobic Micro-Nano Hybrid Structures by Reactive Ion Etching with Au Nanoparticle Masks (나노입자 마스크를 이용하여 제작한 초소수성 마이크로-나노 혼성구조)

  • Lee, C.Y.;Yoon, S.B.;Jang, G.E.;Yun, W.S.
    • Journal of the Korean Vacuum Society
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    • v.19 no.4
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    • pp.300-306
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    • 2010
  • Superhydrophobic micro-nano hybrid structures were fabricated by reactive ion etching of hydrophobic polymer micro patterns using gold nanoparticles as etch masks. Micro structures of perfluoropolyether bisurethane methacrylate (PFPE) were prepared by soft-lithographic technique using polydimethylsiloxane (PDMS) molds. Water contact angles on the surfaces of various PFPE micro structures and corresponding micro-nano hybrid structures were compared to examine the effects of micro patterning and nanostructure formation in the manifestation of superhydrophobicity. The PFPE micro-nano hybrid structures exhibited a very stable superhydrophobicity, while the micro-only structures could not reach the superhydrophobicity but only showed the unstable hydrophobicity.

Photolithographic Silicon Patterns with Z-DOL (perfluoropolyether, PFPE) Coating as Tribological Surfaces for Miniaturized Devices

  • Singh, R. Arvind;Pham, Duc-Cuong;Yoon, Eui-Sung
    • KSTLE International Journal
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    • v.9 no.1_2
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    • pp.10-12
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    • 2008
  • Silicon micro-patterns were fabricated on Si (100) wafers using photolithography and DRIE (Deep Reactive Ion Etching) fabrication techniques. The patterned shapes included micro-pillars and micro-channels. After the fabrication of the patterns, the patterned surfaces were chemically modified by coating Z-DOL (perfluoropolyether, PFPE) thin films. The surfaces were then evaluated for their micro-friction behavior in comparison with those of bare Si (100) flat, Z-DOL coated Si (100) flat and uncoated Si patterns. Experimental results showed that the chemically treated (Z-DOL coated) patterned surfaces exhibited the lowest values of coefficient of friction when compared to the rest of the test materials. The results indicate that a combination of both the topographical and chemical modification is very effective in reducing the friction property. Combined surface treatments such as these could be useful for tribological applications in miniaturized devices such as Micro/Nano-Electro-Mechanical-Systems (MEMS/NEMS).

Synthesis of a Perfluoropolyether Intermediate via Electrophilic Fluorine-Substituting Direct Fluorination (친전자성 불소치환 직접플루오르화 반응에 의한 Perfluoropolyether 중간체의 합성)

  • Yun, Seok-Min;Lim, Jae-Won;Jeong, Eui-Gyung;Park, In-Jun;Lee, Young-Seak
    • Polymer(Korea)
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    • v.35 no.2
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    • pp.166-170
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    • 2011
  • This study reported the synthesis of perfluoropolyether intermediate (TP-$COOCF_3$) having a $CF_3$ functional group via electrophilic fluorine substituting direct fluorination from PFPE intermediate (TP-$COOCH_3$) having a $CH_3$ functional group, which was synthesized by the ring opening polymerization and methyl esterification of HFPO. The effects of reaction conditions such as the amount of solvent, fluorine partial pressure, reaction time, were investigated. The results showed that the yield of fluorination reaction became the highest when the reaction was carried out in a mild condition for a long reaction time, which also minimized side reactions. The sample was characterized by FTIR and NMR, which confirmed the synthesis of the final product, TP-$COOCF_3$, via direct fluorination converting $CH_3$ of TP-$COOCH_3$ to $CF_3$ of TP-$COOCF_3$ with 95.4% yield.

Surface Characteristics of Silicon Substrates Coated with Self-assembled Mono-layers (자체조립 단일막으로 코팅된 실리콘 기판의 표면특성)

  • 최성훈;강호종
    • Polymer(Korea)
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    • v.28 no.1
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    • pp.3-9
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    • 2004
  • Silane modified perfluoropolyethers (SPFPE) was synthesized as a self-assembled mono-layers (SAMs) thin film for micro-electro mechanical system (MEMS). SPFPE was compared to the Perfluoropolyethers (PFPE) as well as octadecyltrichlorosilane (OTS) and perfluorooctyltrichlorosilane (FOTS) with respect to the development of hydrophobicity in the SAMs surface. SPFPE shows less hydrophobicity than those of OTS and FOTS. Thermal annealing of SPFPE SAMs resulted in the enhancement of hydrophobicity as much as those of OTS and FOTS. The SAMs formed from SPFPE were found to be similar as OTS and FOTS SAMs with smooth R$\sub$a/ values of 0.3 nm. However, the flexible chain mobility of SPFPE resulted in 50% reduction as much as the fiction force in OTS.

Synthesis and Ozone Resistance Characteristic of Fluorine-containing modified Polyurea (불소계 변성 폴리우레아의 합성 및 오존저항 특성)

  • Kim, Sung Rae;Park, Ji Yong;Lee, Jong Dae
    • Korean Chemical Engineering Research
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    • v.54 no.2
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    • pp.175-180
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    • 2016
  • The fluorine-containing modified polyurea was synthesized using the PTPE-diol to improve the ozone-resistance. Three types (PFDIA-10C, PFDIA-20C, PFDIA-30C) of the modified polyurea containing the fluorine content from 10 wt% to 30 wt% were prepared. After ozone treatment on the prepared films, the weight loss of film was investigated and analyzed the film properties such as hardness, wear resistance, tensile stress, elongation, etc. Also, the film surfaces were observed by the optical microscopy after ozone-resistance tests at 10 ppm for 336 h. It was shown that the defects such as the cracking, the bleaching and the mass loss were reduced and the ozone-resistance of films were improved when the contents of PFPE-diol are more than 20 wt%. It was found that the intensity of O-H peak in PFDIA compounds confirmed by FT-IR was decreased as fluorine contents were increasing.