Vinyl surfaces, surface chemistry

In order to probe the influence of Au and KOAc on the vinyl acetate synthesis chemistry, four different catalysts were synthesized. All of these catalysts were prepared in a manner exemplified in prior patent technology [Bissot, 1977], and each contained the same palladium loading in an egg-shell layer on the surface of a spherical silica support. The palladium content in the catalyst was easily controlled by adjusting the solution strength of palladium chloride (PdClj) added to the porous silica beads prior to its precipitation onto the support by reaction with sodium metasilicate (Na SiOj). The other two catalyst components (Au and KOAc) were either present or absent in order to complete the independent evaluation of their effect on the process chemistry, e.g., (1) Pd-i-Au-hKOAc, (2) Pd-i-KOAc, (3) Pd-hAu, and (4) Pd only. 

Ham, J.E. and Wells, J.R. (2008) Surface chemistry reactions of alpha-terpineol [(r)-2-(4-methyl-3-cyclohexenyl)isopropanol] with ozone and air on a glass and a vinyl tile. Indoor Air, 18 (5), 394-407. 

The polarity and adsorption data discussed above reveal some interesting aspects of the surface chemistry of vinyl acrylic latex surfaces. It is quite likely that the polarity of the latex films, expecially of the two co-polymers, determined by contact angle measurements may not correspond exactly with their respective latex surfaces in the dispersed state due to reorientation of polymer chains during film formation. But the surfactant adsorption data shows clearly that the three latex surfaces in their dispersed state do exhibit varying polarity paralleling the trend found from contact angle measurements. The result also shows that the surface of the co-polymer latex surface is a mixture of vinyl acetate and acrylate units. This result is somewhat unexpected in a vinyl acrylic latex, prepared by a batch... 

FIG. 9 XPS analysis of PLA-PEG microparticle surfaces showing the contribution to surface chemistry of the lactic acid, ethylene glycol, and vinyl alcohol groups. (From Ref. 37.)... 

W.C.H. Kupferschmidt, J.B. Buttazoni, G.J. Evans, B.L. Ford, A.S. Palson, R. Portman and G.G. Sanipelli, Iodine Chemistry in the Presence of Vinyl Surfaces , In Proceedings of the Third CSNI Workshop on Iodine Chemistry in Reactor Safety, Toki-Mura (Japan), 1991, Japan Atomic Energy Research Institute Report JAERI - M 92-012, p. 213 (1992). 

Kupferschmidt, W. C. H., Buttazoni, J. B., Evans, G. J., Ford, B. L., Palson, A. S., Portman, R., Sanipelli, G. G. (b) Iodine chemistry in the presence of vinyl surfaces. Proc. 3. CSNI Workshop on Iodine Chemistry in Reactor Safety, Tokai-mura, Japan, 1991 Report JAERl-M 92-012 (1992) p. 213-229... 

CCT has also been applied to surface chemistry. Nanosilica surface-grafted PMMA macromonomers were prepared by CCTP. The first step involved CCTP of 3-(trimethoxysilyl) propylmethacrylate coupled to the nanosilica surface with terminal vinyl groups accessible on the surface. Subsequently, grafting of PMMA by CCTP was achieved. Complex polymeric stmaures have been synthesized by grafting of copolymers. One example has St/BA/2-dimethylaminoethyl methacrylate (DMAEMA) as the tmold chain composition with the lateral chain being composed of MMA/BMA for use in dispersants with quatemization able to occur." ... 

Tang C, Wu M, Wu Y, Liu H (2011) Effects of fiber surface chemistry and size on the structure and proptaties of poly(vinyl alcohol) composite films reinforced with electrospun fibers. Compos Part A Appl S 42 1100-1109... 

---