- Synthesis of novel cyclosiloxane monomers containing push-pull moieties and their anionic ring opening polymerization
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The synthesis of three novel tetracyclosiloxane monomers modified either with a nitroaniline (NA) or with a Disperse Red 1 (DR1) push-pull group and their ring opening polymerization reaction in the presence of tetramethylammonium hydroxide are presented. The prepared monomers and polymers were characterized by different spectral methods and gel permeation chromatography. For the crystalline monomers, the structures were further proven by single crystal X-ray diffraction. Dynamic scanning calorimetry shows that the polymers that carry NA groups have a glass transition temperature (Tg) well below room temperature (RT), while the one that carries DR1 groups melts at 55 °C. The transition temperatures have a strong effect on permittivity as indicated by broadband impedance spectroscopy measurements conducted at different temperatures and frequencies. The polymers modified with NA groups have a high permittivity (maximum value of 17.3) at RT, suggesting the polar groups to be mobile and orientation polarization to be effective. However, the polar groups of the polymer modified with DR1 are frozen and thus cannot contribute to the permittivity via orientation polarization. Consequently, the permittivity is only 8.8 at RT, but increases to 22 above the melting temperature, where the dipoles are mobile. Because of the high dielectric permittivity and rather low Tg, the polymers modified with NA are attractive as active dielectric materials in actuators, capacitors, and stretchable electronics, whereas the polymer modified with DR1 may be of interest in nonlinear optical devices.
- Perju, Elena,Cuervo-Reyes, Eduardo,Shova, Sergiu,Opris, Dorina M.
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p. 7569 - 7578
(2018/03/01)
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- Polymer dye and its preparation method, resist composition and display device
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The disclosure relates to display technology field, especially relates to a polymer dye and a method for preparing the same, a photoresist composition, a color photoresist, and a display device. The polymer dye is formed by the copolymerization of an acry
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Paragraph 0075; 0076; 0077; 0078; 0079; 0080; 0081
(2017/08/24)
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- METHODS FOR OBTAINING COLORED OR CHROMIC SUBSTRATES
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The present invention provides a post-fabrication modification approach for the fabrication of colored and chromic materials and sensors using plasma surface modification to covalently bind the coloring agent to the substrate, thus avoiding leaching of th
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Page/Page column 7; 19; 20
(2018/01/17)
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- PARTICLES FOR ELECTROPHORETIC DISPLAYS
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This invention relates to coloured polymer particles preferably with surface functionality for charge retention, a process for their preparation, the use of these particles for the preparation of an electrophoretic device, colour electrophoretic displays comprising such particle, and new polymerisable dyes.
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Page/Page column 92-93
(2012/03/09)
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- Synthesis and characterization of poly(ethylene glycol) diacrylate copolymers containing azobenzene groups prepared by frontal polymerization
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A novel polymer matrix containing amino-nitro substituted azobenzene groups was obtained by frontal polymerization. (E)-2-(Ethyl(4-((4-nitrophenyl) diazenyl)phenyl)amino)ethyl methacrylate (MDR-1) was copolymerized with poly(ethylene glycol) diacrylate (PEGDA) using this easy and fast polymerization technique. The effect of the amount of the incorporated azo-monomer into the polymer matrix was studied in detail and correlated to front velocity, maximum temperature, initiator concentration, and monomer conversion. The obtained materials were characterized by infrared spectroscopy (Fourier transform infrared), and their thermal properties were studied by thermogravimetric analysis and differential scanning calorimetry. Moreover, the optical properties of the polymers were studied by absorption spectroscopy in the UV-Vis region. Absorption spectra of the copolymers exhibit a significant blue shift of the absorption bands with respect to the azo-monomer, due to the presence of H-aggregates. Cubic nonlinear optical (NLO) characterizations of the PEGDA/MDR-1 copolymers were performed according to the Z-Scan technique. It has been proven that samples with higher MDR-1 content (0.75 mol %) exhibited outstandingly high NLO-activity with negative NLO-refractive coefficients in the promising range of n2 = -8.057 × 10-4 esu.
- Illescas, Javier,Ramirez-Fuentes, Yessica S.,Rivera, Ernesto,Morales-Saavedra, Omar G.,Rodriguez-Rosales, Antonio A.,Alzari, Valeria,Nuvoli, Daniele,Scognamillo, Sergio,Mariani, Alberto
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experimental part
p. 3291 - 3298
(2012/05/07)
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- Side-chain azobenzene polymers: Synthesis and photochemical properties
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A series of methacrylic monomers containing azobenzene moiety with alkyl spacer and different substituents is synthesized. Their photophysical and photochemical properties have been investigated. The photophysical properties of these compounds are investi
- Smokal, Vitaliy,Krupka, Oksana,Sahraoui, Bouchta,Kolendo, Alexey
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experimental part
p. 115 - 121
(2011/10/04)
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- Comblike thermoresponsive polymers with sharp transitions: Synthesis, characterization, and their use as sensitive colorimetric sensors
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The synthesis and thermoresponsive behavior of two structural novel comblike polymers are presented, which are constituted by polymethacrylates main chain with dendritic oligoethylene glycol (OEG) side groups spaced with a linear hydrophobic alkyl [PG1(A)
- Liu, Lianxiao,Li, Wen,Liu, Kun,Yan, Jiatao,Hu, Guixia,Zhang, Afang
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scheme or table
p. 8614 - 8621
(2012/03/22)
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- Nonlinear optical properties and memory effects of the azo polymers carrying different substituents
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The third-order nonlinear optical properties and electric memory behavior of azobenzene polymers were influenced by different substituents. The nonlinear optical coefficients of polymer films measured using the Z-scan technique revealed that the polymers with different substituents exhibited different nonlinear absorption. The reversibility of sandwich memory devices based on the azobenzene polymers was dependant on the terminal substituent on the azobenzene chromophore. Polymers with electron-accepting terminal moieties in the azobenzene pendant showed write-once-read-many-times memory whereas the polymer that contained electron-donating moieties displayed a FLASH-type (rewritable) memory.
- Li, Najun,Lu, Jianmei,Li, Hua,Kang, En-Tang
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scheme or table
p. 18 - 24
(2010/12/19)
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- Concentration variation of quadratic NLO susceptibility in PMMA-DR1 side chain polymer
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Chemical synthesis and concentration dependence of two second order NLO tensor components: Χ(2)pp(-2ω ω, ω) and Χ(2)sp(-2ω ω, ω) was studied for a side chain polymer PMMA-DR1 in thin films by optical second harm
- Kajzar,Krupka,Pawlik,Mitus,Rau
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experimental part
p. 180 - 190
(2011/08/03)
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- Bonding and molecular environment effects on near-infrared optical absorption behavior in nonlinear optical monoazo chromophore-polymer materials
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The mono-azo dyes Disperse Red 1 and Disperse Red 19 have been studied for several years as chromophores in polymers for nonlinear optical properties. These materials are examined here for the effects of dye donor group esterification in guest-host system
- Barto, Richard R.,Frank, Curtis W.,Bedworth, Peter V.,Taylor, Rebecca E.,Anderson, William W.,Ermer, Susan,Jen, Alex K.-Y.,Luo,Ma, Hong,Tang, Hong-Zhi,Lee, Michael,Ren, Albert S.
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p. 7566 - 7577
(2007/10/03)
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- Quantitative Determination of the Polar Order Induced under High Electric Field in Amorphous PDR1M Azobenzene Polymer Films
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Thin films of amorphous pDR1M azobenzene homopolymer have been wire poled under high-field conditions. All poled films show a very efficient axial and also a strong polar ordering, as shown by polarized UV-visible measurements and SHG experiments. One of
- Rodriguez,Adamietz,Sanguinet,Buffeteau,Sourisseau
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p. 9736 - 9743
(2007/10/03)
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- Efficient fully functionalized photorefractive polymethacrylates with infrared sensitivity and different spacer lengths
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A series of photorefractive polymethacrylates, containing a Disperse Red type chromophore and carbazole as charge transport agent with various spacer lengths, was synthesized and characterized. The photorefractive effect of these materials was studied by
- Engels, Christiaan,Van Steenwinckel, David,Hendrickx, Eric,Schaerlaekens, Mark,Persoons, Andre,Samyn, Celest
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p. 951 - 957
(2007/10/03)
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- Perfluoroalkylsulfonyl-Substituted Azobenzenes as Second-Order Nonlinear Optical Chromophores
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4-Perfluoroalkylsulfonyl (RfSO2)-substituted azo nonlinear optical chromophores (NLOphores) showed enhanced second-order nonlinear coefficients (d33) and improved relaxation behavior compared with the corresponding nitro compound (Disperse Red 1 (DR1)) in both doped poly(methylmethacrylate) (PMMA) and pendanted methylmethacrylate (MMA) copolymer.
- Matsui, Masaki,Kawase, Ritsu,Funabiki, Kazumasa,Muramatsu, Hiroshige,Shibata, Katsuyoshi,Ishigure, Yoshinao,Hirota, Kazuo,Hosoda, Masahiro,Tai, Kazuo
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p. 3153 - 3158
(2007/10/03)
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