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FtOH 6:2 (647-42-7)


127 References Were Found:

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Synthesis and properties of novel polyimides containing fluorinated alkoxy side groups

Authors: Bes, L; Rousseau, A; Boutevin, B; Mercier, R; Kerboua, R (2001) Macromolecular Chemistry and Physics 202:2954-2961. HERO ID: 3857380

[Less] A novel method for the preparation of a fluorinated aromatic diamine was investigated. This new diamine . . . [More] A novel method for the preparation of a fluorinated aromatic diamine was investigated. This new diamine contains a fluoroalkoxy (C6F13-C2H4-O-) side chain and it was synthesised by the reaction of 1H,1H,2H,2H-perfluorooctanol with 2-(4-nitrophenoxy)-4-nitrophenol via the Mitsunobu reaction and subsequent,reduction. This novel diamine was used with different,dianhydrides, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), pyromellitic dianhydride (PMDA) land benzophenonetetracarboxylic dianhydride (BTDA) to prepare polyimides by direct thermal imidization. The polyimide properties such as inherent viscosity, solubility, thermal and surface properties were investigated to illustrate the contribution of the fluoroalkoxy group that is attached to the polyimide backbone. The resulting poly-imides possessed good thermal properties, the presence of the fluoroalkoxy group did not affect the thermal stability and increased the solubility in common organic solvents. The glass transition temperatures (T-g) of the fluorinated polyimides were higher than 195 degreesC. The surface tension determined by contact angle measurements of the polyimide prepared with dianhydride 6FDA and diamine containing fluorinated alkoxy side group was 25.3 mN . m(-1).

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Temperature effect on the adsorption of fluorooctanols at the hexane/water interface

Authors: Takiue, T; Sugino, K; Higashi, T; Toyomasu, T; Hayami, Y; Ikeda, N; Aratono, M (2001) HERO ID: 3859248

[Less] The interfacial tensions of the hexane solution of fluorooctanols (1,1,2,2-tetrahydrotridecafluorooctanol, . . . [More] The interfacial tensions of the hexane solution of fluorooctanols (1,1,2,2-tetrahydrotridecafluorooctanol, TFC8OH, and 1,1-dihydropentadecafluorooctanol, DFC8OH) against water were measured as a function of temperature and molality under atmospheric pressure. By drawing the interfacial pressure a vs mean area per adsorbed molecule A curves, it was concluded that the adsorbed film of TFC8OH exhibits a first-order phase transition between the gaseous and expanded states and that of DFC8OH shows the two types of phase transitions from the gaseous to the expanded state and from the expanded to the condensed one at the hexane/water interface. The comparison of the pi vs A curve between TFC8OH and DFC8OH shows that the intermolecular interaction is enhanced by the substitution of fluorine for hydrogen on the beta -carbon of TFC8OH. Furthermore, the difference in the transition pressure between DFC8OH and TFC10-OH (1,1,2,2-tetrahydroheptadecafluorodecanol) is explained by the differences in London dispersion force between hydrophobic chains and the dipole moment of their hydroxyl group. The partial molar entropy (s) over bar (H)(s) - s(s)(O) and energy (u) over bar (H)(s) - u(s)(O) changes of adsorption were evaluated and compared to those of TFC10OH. The (s) over bar (H)(s) - s(s)(O) value is negative and therefore alcohol molecules have smaller entropy at the interface than in the solution, which is attributable to the orientation of the molecules at the interface. The phase transition from the expanded to the condensed state in the adsorbed TFC10OH film causes larger decrease in partial molar entropy than that in the DFC8OH one. This may arise from the larger partial molar entropy of TFC10OH molecules due to the larger entropy of mixing of longer fluorocarbon chain with hexane in the expanded state and the smaller entropy of TFC10OH due to the stronger attractive interaction in the condensed state than that of DFC8OH molecules. The (u) over bar (H)(s) - u(s)(O) value is less negative for DFC8OH than for TFC10OH and therefore the energetical stabilization of DFC8OH accompanied by the adsorption from the solution is less than that of TFC10OH. Furthermore, it was concluded that the DFC8OH molecules are stabilized by forming the condensed film at the interface because of the strong molecular interaction between them, and the TFC8OH molecules form mainly tetramers in the hexane solution to lower the energetical state of the system.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Grafting of perfluoroalkyl chains onto wood using blocked isocyanates

Authors: Engonga, PE; Marchetti, V; Gerardin, P; Tekely, P; Loubinoux, B (2000) HERO ID: 3859222

[Less] Chemical modification of wood was investigated using blocked isocyanates prepared from reaction of 4,4'-diphenylmethane . . . [More] Chemical modification of wood was investigated using blocked isocyanates prepared from reaction of 4,4'-diphenylmethane diisocyanate (MDI) with I equivalent of 2-perfluorohexyl ethanol followed by addition of 1.1 equivalent of methyl ethyl ketoxime (MEKO). Thermal dissociation of the urethane linkage bearing a methyl ethyl ketoxime group allows generation of free isocyanate which reacts with alcohols like cyclohexanol or benzyl alcohol. The reaction was then extended to the hydroxyl groups of wood in order to bind perfluoroalkyl chains. Reaction was first studied on wood meal before grafting on blocks. Such modified blocks possess improved dimensional stability compared to untreated ones. Contact angle measurements were also performed. sigma values obtained for modified blocks were greater and did not decrease with time compared to those obtained with unmodified blocks. (C) 2000 Elsevier Science S.A. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Novel graft stabilizers for the free radical polymerization of methyl methacrylate in supercritical carbon dioxide

Authors: Giles, MR; O'Connor, SJ; Hay, JN; Winder, RJ; Howdle, SM (2000) Macromolecules 33:1996-1999. HERO ID: 3857368

[Less] This paper reports the free radical polymerization of methyl methacrylate (MMA) in supercritical carbon . . . [More] This paper reports the free radical polymerization of methyl methacrylate (MMA) in supercritical carbon dioxide (scCO(2)) using novel graft copolymer stabilizers. The stabilizers are formed by the thermal ring-opening reaction of poly(methyl vinyl ether-alt-maleic anhydride) with 1H,1H,2H,2H-perfluorohexan-1-ol (1) or 1H,1H,2H,2H-perfluorooctan-1-ol (2). These stabilizers are effective at low concentrations (0.1-2 wt % with respect to MMA) for the dispersion polymerization of MMA leading to high yields of poly(methyl methacrylate) (PMMA) with reasonable molecular weights, narrow molecular weight distribution, and narrow particle size distribution. The increase of graft chain length by only two carbon units has a substantial effect on the stabilizers' activity.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Pressure effect on the adsorption of 1,1,2,2-tetrahydrotridecafluorooctanol at the hexane/water interface

Authors: Hayami, Y; Ono, S; Ikeda, N; Takiue, T; Aratono, M (2000) HERO ID: 3859223

[Less] The interfacial tension of the hexane solution of 1,1,2,2-tetrahydrotridecafluorooctanol CF3(CF2)(5)(CH2)(2)OH . . . [More] The interfacial tension of the hexane solution of 1,1,2,2-tetrahydrotridecafluorooctanol CF3(CF2)(5)(CH2)(2)OH (FC8OH) against water was measured as a function of pressure at various concentrations m(1) and 298.15 K. There are three series of the break points, two of which result from a phase transition in the adsorbed film at the hexane/water interface and the other one results from a solubility limit of FC8OH in hexane. The curve of the interfacial pressure vs area per adsorbed molecule ofFCsOK was drawn and compared with those of the 1,1,2,2-tetrahydroheptadecafluorodecanol CF3(CF2)(7)(CH2)(2)OH (FC10OH) and 1,1,2,2-tetrahydrohenicosafluorododecanol CF3(CF2)(9)(CH2)(2)OH (FC12OH) systems previously reported. It was concluded that the adsorbed film of FC8OH reveals the first-order phase transitions between a gaseous and an expanded state and that between an expanded and a condensed state. The value of the volume change Delta nu associated with the adsorption in the gaseous and expanded state decreases rapidly with an increase in mi, while that in the condensed state decreases very slowly. It was described from the curves of Delta nu vs m(1) for FC8OH, FC10OH, and FC12OH at 80 MPa that the expanded state region in the interfacial film structure strongly decreases with increasing the chain length and disappears at the FC12OH film and that the by value in the condensed state rapidly decreases with an increase in the chain length. We can explain that the pressure dependence of by in the condensed state is produced by the pressure dependence of the partial molar volume of FC8OH in the hexane solution. We concluded that the deposition is not a pure liquid but FC8OH-rich phase containing small quantity of hexane.

Journal Article
Journal Article

SYNTHESIS AND POLYMERIZATION OF FLUORINATED ACRYLIC-MONOMERS SUBSTITUTED IN A ALPHA-POSITION .2

Authors: Bessiere, JM; Boutevin, B; Elbachiri, A; Elharfi, A (1993) 194:2939-2947. HERO ID: 3857366

[Less] The synthesis of 2-perfluorohexylethyl alpha-acetoxyacrylate(b)) H2C=C(OAc)CO2C2H4C6F13 (1) was performed . . . [More] The synthesis of 2-perfluorohexylethyl alpha-acetoxyacrylate(b)) H2C=C(OAc)CO2C2H4C6F13 (1) was performed in two steps starting from Pyruvic acid and 2-perfluorohexylethanol (3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octanol) with an overall yield of about 50%. Esterification of pyruvic acid with the adequate fluorinated alcohol was followed by enol acetylation to give monomer 1. Homopolymerization and copolymerization of 1 are easily carried out. From the kinetic study of the homopolymerization and copolymerization of 1 with styrene, the numerical values of the ratio square of the rate constant of propagation over the rate constant of termination k(p)2/k(t) and of the copolymerization reactivity ratios r1 and r2 of the two monomers were determined.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

EFFICIENT SOLVENT FOR SUPPORTED LIQUID MEMBRANE-TRANSPORT WITH LIPOPHILIC MONOAZA-18-CROWN-6

Authors: Nakatsuji, Y; Shimizu, H; Morita, H; Masuyama, A; Okahara, M (1992) HERO ID: 3859233

[Less] When 2-(perfluorohexyl)ethanol was used as the solvent in a supported liquid membrane system using N-[2-(perfluorohexyl)ethyl]-monoaza-18-crown-6 . . . [More] When 2-(perfluorohexyl)ethanol was used as the solvent in a supported liquid membrane system using N-[2-(perfluorohexyl)ethyl]-monoaza-18-crown-6 as the carrier, the lipophilicity of counter anions such as chloride, bromide, iodide, nitrate, hydroxide, and picrate was found to have little effect on the transport velocity for K+.