Synthesis and characterization of novel polysiloxane-grafted fluoropolymers

2005 ◽  
Vol 83 (6-7) ◽  
pp. 553-558 ◽  
Author(s):  
Bilal Baradie ◽  
Patricia HM Lai ◽  
Molly S Shoichet
Keyword(s):  
Carbon Dioxide ◽  
Thermal Stability ◽  
Supercritical Carbon Dioxide ◽  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Contact Angles ◽  
Synthesis And Characterization ◽  
Water Contact ◽  
Degradation Temperature

Fluorosilicone polymers combine the properties of both fluorocarbons and siloxanes, yielding materials with unique properties. Novel crosslinked fluorosilicone polymers were synthesized by grafting diisocyanate-terminated polydimethylsiloxane (PDMS) to hydroxyl-functionalized fluoropolymers of poly(tetrafluoroethylene-co-vinyl acetate-co-vinyl alcohol) (PTFE-VAc-VA), as confirmed by elemental bulk and surface analysis. The fluorosilicone polymers containing 34 mol% of TFE were thermally stable with a degradation temperature of 267 °C. Fluorosilicone films were found to be more hydrophobic than the parent, non-grafted fluoropolymers; dynamic advancing and receding water contact angles for PTFE-co-VAc-co-VA-g-PDMS were 104° ± 1° and 61° ± 1°, respectively, whereas for PTFE-co-VAc they were 90° ± 2° and 59° ± 2°. The combined properties of thermal stability and hydrophobicity suggest that these fluorosilicones may be useful for coating and paint applications.Key words: fluoropolymers, fluorosilicone, polydimethylsiloxane, supercritical carbon dioxide.

Synthesis and characterization of ZnO/PET composite using supercritical carbon dioxide impregnation technology

2011 ◽  
Vol 42 (7) ◽  
pp. 757-761 ◽  
Author(s):  
Marcos R. Mauricio ◽  
Fernando C.G. Manso ◽  
Marcos H. Kunita ◽  
Daniel S. Velasco ◽  
Antonio C. Bento ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Synthesis And Characterization ◽  
Supercritical Carbon

Gels for the Conservation of Cultural Heritage

2012 ◽  
Vol 1418 ◽  
Author(s):  
Piero Baglioni ◽  
Debora Berti ◽  
Massimo Bonini ◽  
Emiliano Carretti ◽  
Maria Del Carmen Casas Perez ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Ftir Spectroscopy ◽  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Random Copolymer ◽  
Synthesis And Characterization ◽  
Poly Vinyl Alcohol ◽  
Works Of Art ◽  
Polymeric Dispersions

ABSTRACTThe consolidation of a pictorial surface or the removal of undesired material from the surface of an artifact, are the most important and delicate operations in the conservation of cultural heritage. In this contribution we report on the synthesis and characterization of two innovative systems for the cleaning of works of art: i) highly viscous polymeric dispersions (HVPDs) of poly(vinyl alcohol-co-vinyl acetate) random copolymer (PVAc), and ii) chemical gels from acrylamide - N,N’-methylene bisacrylamide, loaded with innovative aqueous cleaning systems. These systems were prepared, characterized and tested over artistic surfaces, such as wood and canvas. Rheology and FTIR spectroscopy allowed the characterization of the materials, and provided evidence that the systems allow an efficient cleaning of the substrates, without leaving residues.

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