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Journal articles on the topic 'Difluorobenzophenone'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Maginn, S. J., and R. J. Davey. "4,4'-Difluorobenzophenone." Acta Crystallographica Section C Crystal Structure Communications 50, no. 2 (1994): 254–55. http://dx.doi.org/10.1107/s0108270193007437.

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2

MAGINN, S. J., and R. J. DAVEY. "ChemInform Abstract: 4,4′-Difluorobenzophenone." ChemInform 25, no. 24 (2010): no. http://dx.doi.org/10.1002/chin.199424037.

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3

Carr, Albert A., Edward W. Huber, John M. Kane, and Francis P. Miller. "An unusual cleavage of 2,5-difluorobenzophenone." Journal of Organic Chemistry 51, no. 9 (1986): 1616–18. http://dx.doi.org/10.1021/jo00359a051.

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4

Ding, Jun, and Xiao-Yan Li. "(2,6-Difluorobenzophenone)tris(trimethylphosphine)cobalt(0)." Acta Crystallographica Section E Structure Reports Online 65, no. 5 (2009): m495. http://dx.doi.org/10.1107/s1600536809012367.

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5

Adams, Dave J., James H. Clark, and Heather McFarland. "The formation of 4,4′-difluorobenzophenone from 4,4′-dinitrodiphenylmethane." Journal of Fluorine Chemistry 92, no. 2 (1998): 127–29. http://dx.doi.org/10.1016/s0022-1139(98)00274-7.

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6

Adams, Dave J., James H. Clark, and Heather McFarland. "ChemInform Abstract: The Formation of 4,4′-Difluorobenzophenone from 4,4′-Dinitrodiphenylmethane." ChemInform 30, no. 13 (2010): no. http://dx.doi.org/10.1002/chin.199913126.

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7

Volovšek, V., and D. Kirin. "On the dynamics of the phase transition in 4,4' - difluorobenzophenone." Journal of Molecular Structure 294 (March 1993): 151–53. http://dx.doi.org/10.1016/0022-2860(93)80337-u.

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8

Kurdanova, Z. I., Azamat Zhansitov, Azamat L. Slonov, K. T. Shakhmurzova, A. E. Baykaziev, and S. Yu Khashirova. "Synthesis and Research of Properties of Polyether Ether Ketone." Key Engineering Materials 816 (August 2019): 55–60. http://dx.doi.org/10.4028/www.scientific.net/kem.816.55.

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Polyether ether ketones based on 4,4'-difluorobenzophenone and hydroquinone in sulfolane medium in the presence of anhydrous potassium carbonate were synthesized by the method of high-temperature polycondensation. The rheological, thermal, electrical and physical-mechanical properties are investigated. It is shown that, at processing temperatures, the molecular weight of polyether ether ketones synthesized in sulfolane increases, apparently due to the branching processes of the polymer chain.

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9

Fortney, Andria, and Eric Fossum. "Soluble, semi-crystalline PEEK analogs based on 3,5-difluorobenzophenone: Synthesis and characterization." Polymer 53, no. 12 (2012): 2327–33. http://dx.doi.org/10.1016/j.polymer.2012.03.056.

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10

Stenzenberger, H. D., and P. König. "New functionalized poly(arylene-ether ketone)s and their use as modifiers for bismaleimide resin." High Performance Polymers 5, no. 2 (1993): 123–37. http://dx.doi.org/10.1088/0954-0083/5/2/004.

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A series of new functionalized poly(arylene-ether ketone) copolymers has been prepared by the nucleophilic aromatic displacement reaction from 4,4'-difluorobenzophenone and mixtures of bisphenol-A and 2,2'-bis(3-allyl,4-hydroxyphenyl)-hexat Luoropropane (6F-DABA) in the presence of potassium carbonate. The propenyl functional groups are statistically distributed along the polymer backbone and their concentration was tailored by adjusting the concentration of the starting monomers. These functionalized poly(aryleneether ketone)s (FPAEK) were used as thermoplastic modifiers for a bismaleimide (B

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11

Xu, Ye Wei, Jie Tang, Guan Jun Chang, Fang Hua Zhu, and Lin Zhang. "Synthesis and Characterization of Poly(N-Arylenebenzimidazole Ketone)." Applied Mechanics and Materials 204-208 (October 2012): 4211–14. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4211.

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Using 1,4-bis(2-benzimidazolyl) benzene (BBIB) and 4,4'-difluorobenzophenone as the monomers, poly(N-arylenebenzimidazole ketone) (PNABIK) has been prepared via the aromatic nucleophilic displacement reaction. The chemical structure of PNABIK was confirmed by FT-IR, elemental analysis and 1H NMR. The results show a good agreement with the proposed structures. The polymer was obtained in quantitative yields with Mn value 12500 and Mw value 28600, respectively. DSC and TGA measurements show that the glass transition temperature (Tg) is 202 °C and 5% weight loss temperature is 550°C in nitrogen a

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12

Kirin, D., and V. Volovšek. "Lattice vibrations of semirigid molecules: Low-frequency vibrations of 4,4-difluorobenzophenone and 4,4-dichlorobenzophenone." Journal of Chemical Physics 106, no. 23 (1997): 9505–10. http://dx.doi.org/10.1063/1.473852.

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13

Kirin, D., and G. S. Pawley. "Pressure dependence of the low-frequency raman spectra of 4,4'-difluorobenzophenone and 4,4'-dibromobenzophenone." Chemical Physics Letters 134, no. 4 (1987): 327–30. http://dx.doi.org/10.1016/0009-2614(87)87146-4.

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14

Mu, Jianxin, Yan Wang, Leilei Shi, Kirill Vertogradskiy, and Zhenhua Jiang. "Synthesis and properties of novel poly(ether ether ketone) copolymers with (3,5-ditrifluoromethyl)phenyl and (4-phenoxy)phenyl side groups." High Performance Polymers 23, no. 7 (2011): 506–12. http://dx.doi.org/10.1177/0954008311418383.

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A new nonfluorinated bisphenol monomer 2-(4-phenoxyphenyl)-1,4-diphenol was prepared via a four-step synthesis process. A series of poly(ether ether ketone) copolymers (6FPOP-PEEKs) were derived from 4,4′-difluorobenzophenone via a nucleophilic aromatic substitution polycondensation with various molar feed ratios of bisphenol monomer, 2-(4-phenoxyphenyl)-1,4-diphenol to (3,5-ditrifluoromethyl)phenylhydroquinone. The molecular weights ( Mn values), polydispersities and Tg values of 6FPOP-PEEKs increase as the molar feed ratio of 6FPH/(6FPH+POPH) increases. These 6FPOP-PEEKs show very high therm

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15

Changkhamchom, Sairung, and Anuvat Sirivat. "Sulfonated Poly(Ether Ether Ketone)(S-PEEK) as Derived from Bisphenol-S for a Proton Exchange Membrane (PEM) in Direct Methanol Fuel Cells (DMFC)." Advances in Science and Technology 54 (September 2008): 255–60. http://dx.doi.org/10.4028/www.scientific.net/ast.54.255.

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The currently used Proton Exchange Membrane (PEM) in a Direct Methanol Fuel Cell (DMFC) is NafionÒ, an excellent proton conductor in a fully hydrated membrane. However, it has major drawbacks, such as very high cost, and loss of conductivity at elevated temperature and low humidity. In this work, a novel PEM based on sulfonated poly(ether ether ketone) (S-PEEK). Poly(ether ether ketone) (PEEK) was synthesized by the nucleophilic aromatic substitution polycondensation of Bisphonol-S and 4,4'-difluorobenzophenone for system A, and Bisphenol S and 4,4'-dichlorobenzophenone for system B. Bisphenol

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16

Gui, Ting, Yun Zhao, Qing Ze Jiao, Han Sheng Li, and Qin Wu. "Preparation of Heat-Resistant Enameled Wire Coating of Fluorinated Poly (Ether Ether Ketone) and Properties." Advanced Materials Research 1035 (October 2014): 432–36. http://dx.doi.org/10.4028/www.scientific.net/amr.1035.432.

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The soluble poly (ether ether ketone) (PEEK) containing trifluoromethyl group (FPEEK) was prepared by nucleophilic polycondensation reaction of 4, 4'-difluorobenzophenone and 4, 4′-(hexafluoroisopropylidene) diphenol in the presence of an excess of anhydrous K2CO3 with tetramethylene sulfone as the solvent. The structure and thermal stability of FPEEK were studied by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, X-ray diffractometer and thermogravimetric analyzer. The solubility of FPEEK was also investigated using different organic solvents. Then the soluti

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17

Shao, Zhi, and Chengji Zhao. "Poly(ether ether ketone) grafted with sulfoalkylamine as proton exchange membrane." High Performance Polymers 31, no. 5 (2018): 528–37. http://dx.doi.org/10.1177/0954008318775788.

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A series of side-chain-type sulfonated poly(arylene ether ketone)s with high ion exchange capacity (IEC) values were prepared by polycondensation reaction of 4,4′-difluorobenzophenone with 2,2′-bis(3-amino-4-hydroxyphenyl) and bisphenol A, followed by post-grafting reaction using 1,4-butanesultone. For these obtained membranes, sulfoalkylamine functionalized poly(ether ether ketone) (SAm-PEEK)-0.8 with the highest IEC of 3.42 mequiv. g−1 displayed the highest proton conductivity of 0.11 S cm−1 at 25°C and 0.167 S cm−1 at 60°C, respectively. The morphology of these membranes was investigated by

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18

Shaposhnikova, V. V., S. N. Salazkin, V. A. Sergeev, et al. "General features of the reaction of 4,4?-difluorobenzophenone with potassium diphenoxide of 2,2-bis (4-hydroxyphenyl)propane." Russian Chemical Bulletin 45, no. 10 (1996): 2397–401. http://dx.doi.org/10.1007/bf01435391.

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19

Ding, Fu Chuan, Qing Song Chen, Shou Lian Lai, and Xiao Yan Li. "Bismaleimide (BMI) Resin Modified by PEEK Bearing Pendant Reactive Propenyl Groups." Advanced Materials Research 197-198 (February 2011): 1299–305. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1299.

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A reactive poly (ether ether ketone) PEEK with pendant propenyl groups was prepared by nucleophilic aromatic substitution of 4, 4’-Difluorobenzophenone (DFBP), diallylbisphenol A (DABPA) and bisphenyl A (BPA) as monomer. The prepared reactive PEEK with varying proportion was introduced to toughen bismaleimide (BMI) resin composing of 4,4'-bismaleimidodiphenyl methane (BMDM) and DABPA by melt technique without any solvent. The properties of the BMI resin as a function of the reactive PEEK concentration were evaluated. The presence of PEEK heightened the temperature of “ene” reaction for BMI and

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20

Lee, Dong Hoon, Hye Suk Park, Dong Wan Seo, and Whan Gi Kim. "Organic-Inorganic Nano Composite Membranes of Sulfonated Poly(ether Sulfone-Ketone) Copolymer and SiO₂ for Fuel Cell Application." Materials Science Forum 534-536 (January 2007): 97–100. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.97.

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Novel bisphenol-based wholly aromatic sulfonated poly(ether sulfone-ketone) copolymer and organic-inorganic composite membranes were prepared for operation 80°C in polymer electrolyte membrane fuel cell (PEMFCs). The copolymer were synthesized by direct aromatic nucleophilic substitution polycondensation of 4,4-difluorobenzophenone, 2,2’-disodiumsulfonyl- 4,4’-fluorophenylsulfone (40mole% of bisphenol A) and bisphenol A. Polymerization proceeded quantitatively to high molecular weight in N-methyl-2-pyrrolidinone at 180°C. Organic-inorganic composite membranes were obtained by mixing organic po

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21

Lee, Dong Hoon, Hye Suk Park, Dong Wan Seo, Tae Whan Hong, Soon Chul Ur, and Whan Gi Kim. "Synthesis and Characterization of Branched Sulfonated Poly(ether Sulfone-Ketone) Copolymer and Organic-Inorganic Nano Composite Membranes." Materials Science Forum 534-536 (January 2007): 121–24. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.121.

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Branched sulfonated poly(ether sulfone-ketone) copolymer was prepared with bisphenol A, 4,4-difluorobenzophenone, sulfonated chlorophenyl sulfone (40mole% of bisphenol A) and THPE (1,1,1-tris-p-hydroxyphenylethane) as a branching agent. THPE was used 0.4 mol% of bisphenol A to synthesize branched copolymers. Organic-inorganic nano composite membranes were prepared with copolymer and a series of SiO2 nanoparticles (20 nm, 4, 7 and 10 wt%). The composite membranes were cast from dimethylsulfoxide solutions. The films were converted from the salt to acid forms with dilute hydrochloric acid. The m

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22

Li, Mingyan, Zidan Gao, Zhili Li, Zhirong Wang, Rui Zhou, and Baohua Wang. "Determination and correlation of solubility of 4,4′-difluorobenzophenone in pure and binary mixed solvents and thermodynamic properties of solution." Journal of Molecular Liquids 317 (November 2020): 113903. http://dx.doi.org/10.1016/j.molliq.2020.113903.

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23

Zhu, Lewei, Boxue Du, Hongna Li, and Kai Hou. "Effect of Polycyclic Compounds Fillers on Electrical Treeing Characteristics in XLPE with DC-Impulse Voltage." Energies 12, no. 14 (2019): 2767. http://dx.doi.org/10.3390/en12142767.

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Electrical tree is an important factor in the threat of the safety of cross-linked polyethylene (XLPE) insulation, eventually leading to the electrical failure of cables. Polycyclic compounds have the potential to suppress electrical treeing growth. In this paper, three types of polycyclic compounds, 2-hydroxy-2-phenylacetophenone, 4-phenylbenzophenone, and 4,4′-difluorobenzophenone are added into XLPE, denoted by A, B, and C. Electrical treeing characteristics are researched with DC-impulse voltage at 30, 60, and 90 °C, and the trap distribution and carrier mobility are characterized. It has

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24

Mao, Hua, Yong You, Lifen Tong, Xiaohe Tang, Renbo Wei, and Xiaobo Liu. "Dielectric properties of poly(arylene ether nitrile ketone) copolymers." High Performance Polymers 31, no. 8 (2018): 901–8. http://dx.doi.org/10.1177/0954008318808570.

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A series of poly(arylene ether nitrile ketone) (PENK) random copolymers are successfully synthesized by the nucleophilic aromatic substitution polymerization of 2,6-dichlorobenzonitrile, 4,4′-difluorobenzophenone with various bisphenol monomers (4,4′-biphenol, bisphenol A, phenolphthalein, and hydroquinone). Compared with poly(arylene ether ketone), the PENK copolymers possess better solubility in polar solvents such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide, dimethylsulfoxide, and so on. Because of the different molecular structures, the PENK copolymers exhibit

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25

Shang, Chengyuan, Xiaojuan Zhao, Junwei Li, Jingang Liu, and Wei Huang. "Poly(aryl ether ketone/sulfone)s containing ortho-methyl and pendant trifluoromethyl-substituted phenyl groups: Synthesis and properties." High Performance Polymers 24, no. 8 (2012): 692–701. http://dx.doi.org/10.1177/0954008312449845.

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Two novel bisphenols, 1,1-bis(4′-hydroxy-3′,5′-dimethylphenyl)-1-(3′′-trifluoromethylphenyl)-2,2,2-trifluoroethane (4M6FDO) and 1,1-bis(4′-hydroxy-3′,5′-dimethylphenyl)-1-[3′′,5′′-bis(trifluoromethyl)phenyl]-2,2,2-trifluoroethane (4M9FDO), with methyl groups ortho-substituted to the phenol groups, bulky trifluoromethyl-substituted phenyl groups and trifluoromethyl groups in the structure, were synthesized and characterized. The bisphenols were polymerized with 4,4′-difluorobenzophenone and bis(4-fluorophenyl) sulfone, respectively, via a aromatic nucleophilic substitution polycondensation to a

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26

Dou, Zhiyu, Xianfeng Li, Shuangling Zhong, Chengji Zhao, and Hui Na. "The Synthesis and Characterization of a Novel Ternary Polymer Bisphenol A-4,4’-Difluorobenzophenone-bis(p-hydroxylphenyl)-1,4,5,8-naphthalenetetracarboxylic Diimide Monomer." Polymer Bulletin 57, no. 3 (2006): 351–58. http://dx.doi.org/10.1007/s00289-006-0558-7.

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27

Zhang, Wenmeng, Shaoyun Chen, Dongyang Chen, and Zhuoliang Ye. "Sulfonated Binaphthyl-Containing Poly(arylene ether ketone)s with Rigid Backbone and Excellent Film-Forming Capability for Proton Exchange Membranes." Polymers 10, no. 11 (2018): 1287. http://dx.doi.org/10.3390/polym10111287.

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Sterically hindered (S)-1,1′-binaphthyl-2,2′-diol had been successfully copolymerized with 4,4′-sulfonyldiphenol and 4,4′-difluorobenzophenone to yield fibrous poly(arylene ether ketone)s (PAEKs) containing various amounts of binaphthyl unit, which was then selectively and efficiently sulfonated using ClSO3H to yield sulfonated poly(arylene ether ketone)s (SPAEKs) with ion exchange capacities (IECs) ranging from 1.40 to 1.89 mmol·g−1. The chemical structures of the polymers were confirmed by 2D 1H–1H COSY NMR and FT-IR. The thermal properties, water uptake, swelling ratio, proton conductivity,

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28

Koch, Thomas, and Helmut Ritter. "Functionalized Poly(ether ether ketones) from 4,4-Bis(4-hydroxyphenyl)pentanoic Acid, 2,2'-Isopropylidenediphenol, and 4,4'-Difluorobenzophenone: Synthesis, Behavior, and Polymer Analogous Amidation of the Carboxylic Groups." Macromolecules 28, no. 14 (1995): 4806–9. http://dx.doi.org/10.1021/ma00118a004.

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29

Liu, Qiang, Andrew T. Shaver, Yu Chen, et al. "Effect of UV irradiation and physical aging on O2 and N2 transport properties of thin glassy poly(arylene ether ketone) copolymer films based on tetramethyl bisphenol A and 4,4′-difluorobenzophenone." Polymer 87 (March 2016): 202–14. http://dx.doi.org/10.1016/j.polymer.2016.01.075.

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30

Sorokin, Anton E., Alexander P. Krasnov, Vera V. Shaposhnikova, Sergey N. Salazkin, Mikhail V. Gorshkov, and Alexander V. Naumkin. "INTERACTION IN POLYARYLATE – POLY(ARYLENE ETHER KETONE) MIXTURE AT HIGH-TEMPERATURE PROCESSING." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 8 (2019): 147–54. http://dx.doi.org/10.6060/ivkkt.20196208.5890.

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Methods of modifying polyarylate based on bisphenol A and mixture of iso- and terephthalic acids by a representative of a promising class of polymers — polyarylene ether ketone have been discussed in this article. Comparative thermomechanical and thermofriction tests of two grades of poly(arylene ether ketone)based on bisphenol A and 4,4'-difluorobenzophenone (PAEK-32 and PAEK-34) have been carried out. It has been established that PAEK-34 is the most suitable for modifying polyarylate, which is confirmed by its higher softening temperature and stable friction coefficient at elevated temperatu

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31

CARR, A. A., E. W. HUBER, J. M. KANE, and F. P. MILLER. "ChemInform Abstract: An Unusual Cleavage of 2,5-Difluorobenzophenone." Chemischer Informationsdienst 17, no. 50 (1986). http://dx.doi.org/10.1002/chin.198650236.

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32

Blagodatskikh, Inessa, Artur Sakunts, Vera Shaposhnikova, Sergey Salazkin, and Inga Ronova. "Macrocyclic oligomers of an aromatic polyetherketone based on bisphenol A and difluorobenzophenone." e-Polymers 5, no. 1 (2005). http://dx.doi.org/10.1515/epoly.2005.5.1.613.

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AbstractCyclization reactions accompanying the nucleophilic displacement polymerization of bisphenol A and difluorobenzophenone (DFB) were studied. Size distribution and amounts of cyclic species were determined depending on the concentration and isomerism in DFB. Experimental cyclization constants were found to be consistent with the values calculated using Jacobson and Stockmayer’s theory for a freely rotating chain of virtual bonds in the case of 4,4’-DFB. For 2,4’-DFB, hindered rotation around some virtual bonds should be taken into account.

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33

Chen, Yan, Fajian Ren, Jian gang Dai, Dongmei Li, and Shajie Luo. "Poly(ether ether ketone)s containing benzene pendant in the molecular chain: Synthesis, characterization and optical properties." High Performance Polymers, November 15, 2020, 095400832097407. http://dx.doi.org/10.1177/0954008320974074.

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A series of modified poly(ether ether ketone)s containing different content of benzene pendant group in the molecular chain have been successfully synthesized with 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bisphenol A and 4,4′-difluorobenzophenone by nucleophilic substitution. The inherent viscosities of obtained polymers were in the range of 0.261–0.889 dLg−1. They were found to have high glass transition temperatures (Tg) of 150–168°C and 148–169°C (examined by DSC and DMA, respectively), good thermal stability with 5% weight-loss temperature (T5%) of 439–469°C. The tensile strengths of the o

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