Photoinitiator
Mostrando 25-30 de 30 artigos, teses e dissertações.
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25. Sintese fotoquimica de polipirrol em membranas microporosas de PVDF : um novo metodo para obter compositos condutores eletricos
This work outlines a new method to obtain conducting composites of Polypyrrole (PPy)/Poly(vinilydene Fluoride) (PVDF), via UV-ligth induced Polymerization in presence of suitable a Photoacid Generator (PAG) compound such as Iron-arene and Triphenyl Sulfonium salts or organic PAG compound such as chlorinated triazines. Gravimetric and Thermal Gravimetric Anal
Publicado em: 1995
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26. Sintese de oligomeros acrilados de uretana e estudo da degradação termica de resinas fotocuraveis por ultravioleta a base desses oligomeros
The urethane acrylate oligomers are utilized in the formulation of radiation curable coatings for optical fibers. In this work were synthesized two types of the urethane acrylate oligomers with the purpose to develop coating with long "useful" lifetime and to evaluate the thermal degradation process of cured films based on this oligomers. These resins are UV
Publicado em: 1992
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27. Avaliação e controle de estabilidade de armazenamento de compostos fotocuraveis tipo um componente para revestimento de fibras opticas
Photocurable formulations for optical fibers coating for industrial usage must remain stable for a minimum storage period of six months. According to the literature, this stability can be obtained from the addition of inhibitors ,wich suppress the action of free radicals - initiators of polymerization, wich can be thermically activeted during storage. A meth
Publicado em: 1989
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28. Reações fotoquimicas do polibutadieno com compostos carbonilicos organicos
Using light of the same wavelength as the u.v. range of the solar spectrum at Earth s surface, we have studied the photochemical reactions in chloroform solution of commercially available polybutadiene with carbonylic organic compounds. The carbonylic compounds were sorted according to the energy of their (n, p*) excited state in relation to the energy of th
Publicado em: 1982
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29. Perturbations of enzymic uracil excision due to purine damage in DNA.
Phage PBS-2 DNA, which contains uracil in place of thymine, was selectively damaged and then used as substrate for purified Bacillus subtilis uracil-DNA glycosylase. This enzyme releases uracil from DNA in a limited processive manner. Irradiation by ultraviolet light (greater than 305 nm) in the presence of isopropanol and a free radical photoinitiator intro
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30. Endonucleolytic activity directed towards 8-(2-hydroxy-2-propyl) purines in double-stranded DNA.
Photoalkylation of circular covalently closed DNA from phage PM2 with isopropyl alcohol by using a free radical photoinitiator and UV light of lambda greater than 305 nm led to the specific 8-substitution of purine moieties in the DNA, yielding 8-(2-hydroxy-2-propyl)adenine and 8-(2-hydroxy-2-propyl)guanine as the only detectable damage in the DNA. Using thi