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Photopolymerization Reaction (photopolymerization + reaction)
Selected AbstractsSynthesis and transport abilities of new membrane materials incorporating bipyrazolic tripodsJOURNAL OF APPLIED POLYMER SCIENCE, Issue 6 2007Fouad Malek Abstract Membrane materials were obtained by photopolymerization reaction of formulation spread over a polyacrylonitrile (PAN) support. The formulation contains the active bipyrazolic tripods monomers, the styrene, and the photostart. The facilitated transport and the extraction power of Cd(II), Pb(II), and Hg(II) through the synthesized membranes were reported. We have determined both the diffusion flux F of different cations and the selectivity S of the prepared membranes towards each cations. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104, 3967,3972, 2007 [source] Photopolymerization with microscale resolution: Influence of the physico-chemical and photonic parametersJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 11 2008Olivier Soppera Abstract This article is aimed at demonstrating that physicochemical parameters can be used to control the spatial extent (length, width, and shape) of polymer objects in view of micro- and nano-fabrication applications. In particular, we showed that oxygen quenching and internal filter effects could be turned to advantage to modulate the response of the material by controlling the threshold energy of polymerization and/or the shape of the light into the photopolymerizable medium. The experimental configuration used in this study is based on light-induced polymerization at the extremity of an optical fiber that produces polymer micro-objects after development. Spectroscopic approaches and polymerization threshold measurements were performed to quantitatively evaluate the influence of the physicochemical parameters on the micropatterning of photopolymerizable material. Interestingly, fluorescence that is usually regarded as a process competing with photopolymerization reaction, was used for controlling the fabrication process. By this means, it was possible to better understand the impact of a nonhomogeneous irradiation on photopolymerization process and thus, to tune the shape and the size of the final polymer objects. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 3783,3794, 2008 [source] Photoinitiated polymerization in bicontinuous microemulsions: Fluorescence monitoringJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 18 2006C. Peinado Abstract The photopolymerization of bicontinuous microemulsions was simultaneously monitored with differential scanning calorimetry and fluorescence. The kinetics and mechanism of the reaction were studied throughout the entire photopolymerization reaction. The role played by the surfactant in the kinetics and morphology was studied. The nature of the surfactant changed the autoacceleration process and final conversion. The behavior was explained as a result of the differences in the interfacial properties. Anionic cetyltrimethylammonium bromide (CTAB) gave rise to a more flexible interfacial film than anionic sodium dodecyl sulfate (SDS), resulting in competition between the intramolecular and intermolecular reactions in the former systems. As cyclization did not contribute to the increase in the degree of crosslinking, SDS photopolymerization gave solids with a more rigid microstructure. Fluorescence methodology was applied to monitor bicontinuous microemulsion polymerization and to reveal the microstructure and morphology development during photopolymerization. The microemulsion composition was designed to prepare nanoporous, crosslinked materials. Even though the nanostructure of the precursor microemulsions was not retained because of phase separation during polymerization, mesoporous solids were obtained. Their morphologies depended on the nature of the surfactant, and membranes with open cells were successfully prepared with CTAB, whereas more complex morphologies resulted with SDS. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 5291,5303, 2006 [source] Study of Laser-Induced Photopolymerizations by Optical PyrometryMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 15 2004Patrick Lin Abstract Summary: Studies of the 355 nm laser induced free radical and cationic photopolymerization reactions of mono- and multifunctional monomers were conducted. These investigations were carried out with the aid of a specially constructed optical pyrometry instrument that provides rapid, reproducible temperature versus time profiles for these fast photopolymerization reactions. Using this technique, the effects of various reaction parameters and monomer structures on the rate and extent of the photopolymerization reactions were examined. Optical pyrometry instrument for the monitoring of laser-induced photopolymerizations. [source] | ||||||||||