Adhesion on various substrates

Bongiovanni, et al., reported syntheses of fluorinated vinyl ethers (H2C==CHOCH2CH2CnF2ttfi, (n-6 or 8) and their eopolymerization with bis(4-vinyloxybutyl) isophthalate. When added in low eoneentrations (0.1-3.0 wt %) to formulations containing bis(4-vinyloxybutyl) isophthalate, they did not affeet the kinetics of the eationic photopolymerization. The eured films were transparent and showed interesting properties in terms of wettabihty, hardness, eross-eut adhesion, and ehemieal inertness. The fluoro-monomers increased the hydrophobieity of the film surface, whereas the adhesion on various substrates such as glass and wood was unchanged. An increase in the methyl ethyl ketone resistance was also observed. 

TABLE 7.25 Performance of Cyanoacrylate Adhesives on Various Substrates (from Ref. 30)... 

Binders and Resins. The choice of binder is the most important ingredient choice in the formulation process because the binder affects the performance properties of a paint more than any other single ingredient (3). The physical properties of binders required for paints include the abiHty to dry or cure under various ambient conditions, good adhesion to various substrates, abrasion resistance, washabiHty, flexibiHty, water resistance, and ultraviolet light resistance. The balance of these required properties is mosdy dependent on whether the paint is being developed for interior or exterior appHcations. 

The mechanism of adhesion to various substrates has not been fully explained. Brauer Stansbury (1984b) consider that bonding to composite resins occurs by the diffusion of methacrylate polymer chains into the resin. Bonding to base metals is, perhaps, by salt or chelate bridges. Here it is significant that ZOE cements do not bond, so perhaps bonding is due to the action of free EBA on the substrate. The adhesion to porcelain is surprising. Porcelain is inert so that the attachment can hardly be chemical. Also, it would be expected that if a cement adheres to porcelain then it should adhere to untreated enamel and dentine, but this is not so. 

The tendency of spilled mercury to disperse as small drops that roll freely on most surfaces is a well-known characteristic of this liquid. Discuss this behavior in terms of (a) the work of adhesion and the spreading coefficient for mercury on various substrates, (b) surface tension... 

Many different silane coupling agents are available for improving the adhesion between polymers and metals or fillers and fibers [1]. Although organofunctional silanes have been reported to be very effective in such adhesion applications, the exact mechanism by which they function has not been determined conclusively in certain cases. Several techniques have been used to characterize silane films formed on various substrates, such as glass, aluminum, and steel. Some of these methods are XPS [2, 3], FUR [4], IETS [5, 6], NMR [7], and Raman spectroscopy [8]. 

Tphe adhesion of many polymeric coatings on various substrates is poor. 

The two-dimensional ordered layered linear chain carbon films were produced using a pulsed plasma ion-assisted technology [10]. The films were obtained at a rate of lOOnm/min on various substrates (metals, ceramics, polymers, etc.) with good adhesion and homogeneity of the films on the areas of 150 x ISOmm. ... 

A number of novel applications of zeolites depend on the ability to create thin, adhesive films on various substrates. While zeolite films or layers are commonly prepared on dense substrates such as silicon wafers, zeolite membranes are made on porous supports in order to permit permeation through the zeolite layer. Numerous synthetic studies have addressed the goal of obtaining adhesive layers of zeolites on various substrates such as noble and nonnoble metals, glass, ceramics, silicon, and even biological substrates such as cellulose fibers. For a more detailed discussion of zeolite membranes the reader is referred to the article by Julbe in this book. Pertinent reviews to this subject are given in the following references.[57,58]... 

Mclnnes and Bolton (203) disclosed the use of ammonia and primary monofunctional or difunctional aliphatic amines in vapor form for the rapid curing of isocyanate-terminated prepolymers on various substrates, primarily for use in printing inks but made mention also for use in coatings, adhesives, and caulking compounds. 

The current study is aimed at investigating the effect of H B products (based on PAMAM chemistry) on the adhesion of epoxies and PU adhesives using various substrates, and as surface treatments for fibers in an epoxy matrix. 

Application to Various Substrates. Figure 6 summarizes contact an es on various substrates treated with TMSP or HMDS for 30 sec. at lOO C in a gas phase by N2 bubbling of the promoter. Under this actual use condition, TMSP showed equivalent adhesion capability as HMDS on the substrates tested. 

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