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排序方式: 共有71条查询结果,搜索用时 31 毫秒
1.
T. Brian Cavitt Brian Phillips Charles E. Hoyle Bo Pan Sukhendu B. Hait Kalyanaraman Viswanathan Sonny Jnsson 《Journal of polymer science. Part A, Polymer chemistry》2004,42(16):4009-4015
Three‐component photoinitiators comprised of an N‐arylphthalimide, a diarylketone, and a tertiary amine were investigated for their initiation efficiency of acrylate polymerization. The use of an electron‐deficient N‐arylphthalimide resulted in a greater acrylate polymerization rate than an electron‐rich N‐arylphthalimide. Triplet energies of each N‐arylphthalimide, determined from their phosphorescence spectra, and the respective rate constants for triplet quenching by the N‐arylphthalimide derivatives (acquired via laser flash photolysis) indicated that an electron–proton transfer from an intermediate radical species to the N‐arylphthalimide (not energy transfer from triplet sensitization) is responsible for generating the initiating radicals under the conditions and species concentrations used for polymerization. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 4009–4015, 2004 相似文献
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Ch. Happold und L. Hoyle 《Fresenius' Journal of Analytical Chemistry》1938,112(1-2):53
Ohne Zusammenfassung 相似文献
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The 1,3-dianion formed across the sulphone of a β- ketosulphone may be selectively dialkylated in a controlled way with an α, ω-difunctional electrophile to give a 2-ketothiane- 1,1-dioxide. Polar groups in the 2-position of thiane-1,1-dioxides preferentially adopt an axial orientation as shown by detailed nmr studies. In cyclic sulphones such conformational preferences, arising from polar rather than steric effects are rare. 相似文献
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Carbone L Cavalleri A Dolesi R Hoyle CD Hueller M Vitale S Weber WJ 《Physical review letters》2003,91(15):151101
The low-frequency resolution of space-based gravitational wave observatories such as LISA (Laser Interferometry Space Antenna) hinges on the orbital purity of a free-falling reference test mass inside a satellite shield. We present here a torsion pendulum study of the forces that will disturb an orbiting test mass inside a LISA capacitive position sensor. The pendulum, with a measured torque noise floor below 10 fN m/square root of Hz from 0.6 to 10 mHz, has allowed placement of an upper limit on sensor force noise contributions, measurement of the sensor electrostatic stiffness at the 5% level, and detection and compensation of stray dc electrostatic biases at the millivolt level. 相似文献
8.
Non-extractable photoinitiators based on thiol-functionalized benzophenones and thioxanthones 总被引:1,自引:0,他引:1
Hironori Matsushima Qin Li Masamitsu Shirai Charles E. Hoyle 《European Polymer Journal》2010,46(6):1278-1287
Non-extractable photoinitiators could be advantageous for use in biological, electronic, and food packaging applications. Therefore, thioxanthone and benzophenone derivatives were synthesized from 1,6-hexane dithiol and chlorinated benzophenone or thioxanthone. The efficiency of thiol-functionalized photoinitiators in combination with amine co-initiators was compared to benzophenone and isopropylthioxanthone with amine co-initiators, and the cleavage of photoinitiator 2,2-dimethoxy-1,2-diphenylethan-1-one in acrylic resins. The reaction kinetics were analyzed using photo-differential scanning calorimetry and real-time FTIR. Coating physical properties were evaluated by pendulum and pencil hardness, steel-wool scratch and mandrel bend tests. The non-extractable photoinitiators had higher absorbance than their benzophenone or isopropylthioxanthone counterparts due to the sulfide substitution on the phenyl ring, and the free thiol groups reacted with the acrylate by either an amine catalyzed Michael addition or a free-radical chain process. The combination of thiol-functionalized photoinitiators with secondary amines provides an efficient photoinitiator system that is locked into the photopolymerized network and cannot be extracted with typical solvents. 相似文献
9.
The characteristics of fluorescence emission from a polymer containing polyene chromophores have been examined in solution and in the solid state. The shorter wavelength emissions have non-exponential decays. A mechanism of energy redistribution among the polyenes of different size is proposed. 相似文献
10.
Charles D. Hoyle 《General Relativity and Gravitation》2006,38(11):1553-1558
Theoretical speculations about the quantum nature of the gravitational interaction have motivated many recent experiments.
But perhaps the most profound and puzzling questions that these investigations address surround the observed cosmic acceleration,
or Dark Energy. This mysterious substance comprises roughly two-thirds of the energy density of the universe. Current gravitational
experiments may soon have the sensitivity to detect subtle clues that will reveal the mechanism behind the cosmic acceleration.
On the laboratory scale, short-range tests of the Newtonian inverse-square law (ISL) provide the most sensitive measurements
of gravity at the Dark Energy length scale,
where
is the observed Dark Energy density. This length scale may also have fundamental significance that could be related to the
“size” of the graviton. At the University of Washington, we are conducting the world’s most sensitive, short-range test of
the Newtonian ISL.
Fourth Award in the 2006 Essay Competition of the Gravity Research Foundation. 相似文献