Results 1 - 10 of 11999
Results 1 - 10 of 11999. Search took: 0.036 seconds
|Sort by: date | relevance|
[en] Highlights: • Hybrid nanoparticles were synthesized via soap-free seeded emulsion polymerization. • Simultaneous surface functionalization with two ionic comonomers was carried out. • 4-styrenesulfonic acid sodium salt hydrate & potassium methacrylate used as comnomers. • Results showed that the adjusting population of surface charge groups is plausible. • Semi-continuous emulsion polymerization lets incorporation of various comonomers.
[en] According to the present invention, there is provided an apparatus for the continuous production of cured rubber sheets having a surface design comprising: means for extruding rubber into a soft, viscous rubber strip: rotating molding means having the selected design formed in recesses on its surface for receiving the soft, viscous rubber; means for forcing the rubber into recesses; means for directing a beam of high energy ionizing radiation into the viscous rubber to cure the rubber; and means for removing the cured rubber from the recesses. (auth)
[en] Polyacrylonitrile can be synthesized within the micropores of zeolites Beta and ZSM-11 by irradiating gamma ray to the zeolites, on which acrylonitrile monomer was already adsorbed. Alternatively, it can be carried out by heating such zeolites which have impregnated azobisisobutyronitrile as initiator. The resultant composite was analyzed using Thermo Gravimetric Analysis, Differential Scanning Calorimetry and Fourier Transform Infrared Spectroscopy. It was found that framework topology, particularly the pore size limitation, strongly effects polymerization reaction and also thermal degradation behavior of the polymer formed
[en] Two pheomelanin model compounds were prepared and their photochemistries examined. Upon irradiation, an oxygen-mediated photopolymerization reaction was observed. The photopolymers obtained were characterized by their apparent molecular weights, UV and fluorescence spectra. The implications of these findings with respect to the structure and photobiology of pheomelanin are discussed. (author)
[en] Complete text of publication follows. We have developed a new type of radiation dosimeter which is based on radio-fluorogenic co-polymerization 'RFCP'. In this method the dosimeter consists of a liquid monomer which polymerizes when exposed to high energy radiation, for example methylmethacrylate. Dissolved in this bulk monomer is a small (ca millimolar) concentration of a compound that is non-fluorescent but which becomes fluorescent when it is incorporated into a growing polymer chain. The resulting fluorescence is then proportional to the yield of initiating free-radicals formed and hence to the accumulated radiation dose. The method is illustrated by application to remote, real-time dose monitoring within a small (< 0.2 ml) volume. Using a semi-rigid gel form of the RFCP dosimeter, two and three dimensional fluorescent images of a masked 3 MeV electron beam and a 6 MeV X-ray beam have been created.
[en] The coating mass is used to produce the electrically conducting layer of copying material for electrostatic copying processes which can be cured and cross-linked, respectively, by actinic radiation (wavelength not exceeding 4000 A). For this purpose, it contains an acrylic monomer without groups inhibiting free radical polymerization and at least aone terminal acrylate or substituted acrylate group, a polymerization initiator capable of photoactivation, and an alkali salt of acrylic acid, methacrylic acid, vinyl benzene sulfonic acid and/or an allyl substituted quaternary ammonium compound. At least one of the monomers has a terminal ethylene-unsaturated group. (OG)
[de]Die Ueberzugsmasse dient der Herstellung der elektrisch leitenden Schicht von Kopiermaterial fuer elektrostatische Kopierverfahren, die durch aktinische Strahlung (Wellenlaenge hoechstens 4000 A) erhaertet bzw. versetzt werden kann. Hierzu enthaelt sie einen Acrylmonomeren ohne Gruppen, die die freie radikale Polymerisation inhibieren, und mindestens eine endstaendige Acrylat- oder substituierte Acrylatgruppe, einen photoaktivierbaren Polymerisationsinitiator und ein Alkalisalz der Acrylsaeure, Methacrylsaeure, Vinylbenzolsulfonsaeure und/oder eine allylsubstituierte quaternaere Ammoniumverbindung. Mindestens eines der Monomeren weist eine endstaendige aethylenisch ungesaettigte Gruppe auf. (OG)