Poly Vinyl Chloride
Mostrando 25-36 de 38 artigos, teses e dissertações.
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25. Ionic desorption in valence- and core- excited polymers: poly(vinyl chloride) and poly(vinylidene chloride)
Photon stimulated ion desorption (PSID) studies have been performed in poly(vinyl chloride) (PVC) and poly(vinylidene chloride) (PVDC) using synchrotron radiation, covering from valence to core electron (Cl 2p and C 1s) energy ranges. Data acquisition was performed at the TGM beam line from the Brazilian Synchrotron Light Source (LNLS), operating in a multi-
Brazilian Journal of Physics. Publicado em: 2006-06
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26. Compatibility and thermal stability studies on plasticized PVC/PMMA blend polymer electrolytes complexed with different lithium salts
The lithium salt (x) (X= LiAsF6, LiPF6, LiN(C2F5SO2)2 , LiN(CF3SO2)2, LiBF4) was complexed with a host of poly(vinyl chloride) (PVC)/ poly(methyl methacrylate) (PMMA) blend polymer and plasticized with a combination of ethylene carbonate (EC) and propylene carbonate(PC). The polymer electrolyte films were prepared for constant PVC/PMMA blend ratio. The elect
Polímeros. Publicado em: 2005-03
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27. Preparation and characterization of PVC/PMMA blend polymer electrolytes complexed with LiN(C2F5SO2)2
Thin films of polymer blend electrolytes comprising Poly(vinyl chloride) (PVC) and Poly(methyl methacrylate)(PMMA) and plasticized with a combination of ethylene carbonate (EC) and propylene carbonate (PC) for different lithium imide salt, LiN(C2F5SO3)2 , concentrations were prepared using the solution casting technique. The films were subjected to a. c. imp
Polímeros. Publicado em: 2004-03
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28. Estabilidade à radiaÃÃo gama do poli(cloreto de vinila) aditivado e do poli(cloreto de vinila) quimicamente modificado
Poly (vinyl chloride)-PVC is a polar thermoplastic polymer compatible with a wide array of additives, which is used in several practical applications. Among the products made of PVC there are medical devices which need to be sterilized through gamma irradiation. In this work a study was made to evaluate the stability to gamma radiation of PVC additivated, as
Publicado em: 2004
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29. Degradation studies on plasticized PVC films submited to gamma radiation
Poly (vinyl chloride), PVC, is a rigid polymer and for several of its applications must be compounded with plasticizing agents. The plasticizers minimize the dipolar interactions, which exist between the polymer's chains, promoting their mobility. In this work we studied the properties of PVC/plasticizer systems submitted to different doses of gamma radiatio
Materials Research. Publicado em: 2003-12
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30. Thermal lens temperature scanning for quantitative measurements in complex fluids
In this work thermal lens spectrometry is applied to investigate the thermo-optical properties of complex fluids as a function of the temperature. The method is applied in poly(vinyl chloride), in polycarbonate and in lyotropic liquid crystals as the testing samples. The focus of the discussion will be in the temperature range where the phase transitions occ
Brazilian Journal of Physics. Publicado em: 2002-06
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31. Preparação, caracterização e aplicação de membranas polimericas microporosas assimetricas
This work starts with the preparation of asymmetric microporous polymeric membranes through phase inversion technique by immersion-coagulation in the presence of a non-solvent. The poly (vinylidene fluoride)-PVDF was used pure or blended with lithium chloride and one of the following polymeric additives: poly (vinyl acetate)-PVAc or poly (ethylene glycol)-PE
Publicado em: 2002
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32. A espectrometria de fluorescencia de raios-X de energia dispersiva na medida de espessura de filmes polimericos e filmes metalicos espessos
In modern technology there is an increasing need for materials with thickness in nanometer ranges. Energy Dispersive X-Ray Fluorescence Spectrometry (EDXRF) can be considered an important tool for measurements in this range, since the intensity of the elemental X-ray line in a thin film is proportional to its thickness. In this work the purpose was to analyz
Publicado em: 1999
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33. Efeito da radiação ionizante sobre plastissol de DOP/PVC utilizada como simulador de tecido em radioterapia
Recently a tissue simulator called bolus was developed at FEQ/UNICAMP, which is made of dioctyl phtalate and poly (vinyl chloride) (PVC/DOP). This bolus has the function of displacing the maximum dose to the skin and breast cancer. In this way the healthy tissues around the tumor are protected. The bolus composition is 23% (w/w) PVC and 76% (w/w) DOP with 1%
Publicado em: 1997
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34. Sintese, estrutura-morfologia e relação com propriedades macroscopicas do modificador de impacto poli (metacrilato de metila-co-butadieno-co estireno), MB&
Poly(vinyl Chloride), PVC, is an of thermoplastics more useful because exhibits many excellent properties, but impact resistence is not one of them. This properties can be improved with the mixture of impact modifiers in the PVC. In this work was studied the synthesis of poly(methyl methacrylate-co-butadiene-co-styrene), MBS, and the effect of his structure
Publicado em: 1993
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35. Studies on the miscoding properties of 1,N6-ethenoadenine and 3,N4-ethenocytosine, DNA reaction products of vinyl chloride metabolites, during in vitro DNA synthesis.
1,N6-Ethenoadenine (epsilon A) and 3,N4-ethenocytosine (epsilon C) are formed when electrophilic vinyl chloride (VC) metabolites, chloroethylene oxide (CEO) or chloroacetaldehyde (CAA) react with adenine and cytosine residues in DNA. They were assayed for their miscoding properties in an in vitro system using Escherichia coli DNA polymerase I and synthetic t
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36. Conductance in Water-Poly(vinyl alcohol) Mixtures
The conductance of 0.02-0.10 N potassium chloride in poly(vinyl alcohol)-water mixtures at 25° decreases by about 50% as the polymer content increases from zero to 20% by weight, while the bulk viscosity increases from 0.0089 to over 1000 poises. Further increases in polymer concentration transform the highly viscous liquid into an elastomeric solid, in whi