Vapor-phase graft

Niobium Products Co., 50 m /g). Many different synthesis methods have been used to prepare supported metal oxide catalysts. In the case of supported vanadium oxide catalysts, the catalysts were prepared by vapor phase grafting with VOCI3, nonaqueous impregnation (vanadium alkoxides), aqueous impregnation (vanadium oxalate), as well as spontaneous dispersion with crystalline V2O5 [4]. No drastic reduction of surface area of the catalysts was observed. 

A vapor phase grafting process based on the ozonization of polymer films and fabrics followed by a treatment with vapors, such as acrylonitrile, dichloroethylene, and vinyl acetate, has been patented by Polyplastic (66). Also cotton fabrics can be used as substrates. 

Armstrong, and Rutherford have reported extensive studies on the vapor phase grafting of vinyl monomers to cellulosic fibers both mutual and pre-irradiation methods have been used (97, 120). Again, water or another swelling agent was found to be necessary for effective grafting to rayon and cotton for all the monomers studied. In the case of cellulose acetate water was helpful but not necessary except for styrene. Acetic acid and methanol vapors were also found to be effective promotors of vapor phase grafting to cotton and cellulose acetate fibers. 

Photo-Induced Vapor Phase Grafting on Fibers... 

The biacetyl-sensitized vapor-phase grafting technique was... 

K Uezu, K. Saito, T. Sugo and S. Aramaki, Reactor of Vapor-Phase Graft Polymerization of Reactive Monomer onto Porous Hollow Fiber, AIChE J.,... 

Table 1 Parameters of Radiation-Induced Vapor-Phase Grafted Polymerization... 

Fig. 11.6 Schematic depiction of surface photografting processes (a) continuous grafting [91], (b) immersion grafting [97], (c) vapor-phase grafting. Adapted from Ogiwara et al. [98] with permission from John Wiley Sons, Inc.

Monticelli, O. Fina, A. Cozza, E. S. Prato, M. Bruzzo, V., POSS Vapor Phase Grafting A Novel Method to Modify Polymer Films. J. Mater. Chem. 2011,21, 18049-18054. 

The surface of highly oriented polypropylene fibers have been modified by vapor-phase grafting of MA. Little is known about the properties of these grafted fibers. However, the graft sites on the fibers are useful for joining the fibers directly into nonwoven fabrics. 

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