Лако-красочные материалы — производство

In this section we review the properties of grafted polymer layers or polymer brushes. We first consider a standard polymer brush on a solid surface and then discuss the bridging between two surfaces by a polymer brush [12].

Jean-Francois Joanny Institut Charles Sadron, Strasbourg, France G. INTRODUCTION Polymers are involved in many practical adhesion problems. A polymer liquid can be present in the gap between the two media that adhere to one another in order to create strong attractive forces that strengthen the adhesion. In this context it is important to understand how […]

The background to acid-base interactions in adhesion science and technology has been reviewed with the emphasis on polymers, metal oxides, fillers, fibers, and pigments. When these specific exothermic interactions operate at interfaces they have a significant impact on adsorption, wettability, adhesion, and mixing as shown through some selected exam­ples. The importance of such findings has […]

In adhesion science and technology, the manifestations of acid-base interactions have been observed at both macroscopic and microscopic scales (wetting, adhesion, metalliza­tion, etc.). The development of scanning probe microscopic methods (scanning tunneling microscopy (STM) and atomic force microscopy (AFM)) over the past decade has led to the possibility of measuring adhesion forces on the molecular […]

The molecular probe technique in combination with XPS has seldom been used since the early 1970s and has mainly been applied to zeolites [162-164]. These studies were aimed at identifying and quantifying Lewis acidic and basic sites at catalyst surfaces by monitoring the BE shifts of N1s from adsorbed pyridine [162,163] and pyrrole [164], respectively. […]

The IEPS (or PZC) has been defined above in the Section II. F. This acid-base property of metal oxides can be one of the key parameters controlling the adhesion properties of polymer/metal assemblies. However, because of surface rearrangement phenomena (e. g., hydration) involving the overlayers of the oxides, it is expected that siginificant differences between […]

X-ray Photoelectron Spectroscopy (XPS) has been used extensively in adhesion research for determining surface functional groups, studying the locus of failure of adhesive joints, determining molecular orientation following failure [135,136], monitoring the uptake of specific ions [137,138] at the interface, and identifying molecular species seg­regating at polymer-metal oxide interfaces [139-141]. It has also been found […]

a. Determination of DGAB and DHAB. If ‘‘polar’’ probes interact via acid-base forces with the stationary phase, then AGa has a contribution from such specific interactions. Assuming that dispersive and acid-base interactions are additive, then AGab, the acid-base contribution to the free energy of adsorption, is deduced from AGa by -AGab = -(AGa — AGb […]

There are three accepted methods of determining yS values at infinite dilution and which were published by Dorris and Gray [98], Schultz et al. [95] and Donnet et al. [99]. a. The Method of Dorris and Gray. This method [98] is based on the determination of AGCH2, the free energy of adsorption per methylene group, […]

Inverse gas chromatography (IGC) is a method very well used by the adhesion community for obtaining thermodynamic and morphological information on a variety of materials such as fillers, pigments, colloids, fibers, powder, wood, and polymers [17,60,61,85-94]. The term ‘‘inverse’’ means that the stationary phase is of interest by contrast to conven­tional gas chromatography in which […]