Download e-book for iPad: Adhesives and Sealants: General Knowledge, Application by Philippe Cognard
By Philippe Cognard
Contributions from greater than 60 authors, each one a well known expert of their box, were co-ordinated to provide the main complete guide of Adhesives and Sealants ever released. The guide should be released as eight volumes, over a interval of four years and may include over 2800 pages, wealthy with case experiences, commercial functions and the most recent study. it's a paintings in development, allowing the newest new and critical functions to be incorporated as they take place.
Volume 2 of Elsevier's Handbook of Adhesives & Sealants sequence, basic wisdom, software of adhesives & new curing innovations, covers the mechanisms of adhesion, its software, and drying and curing innovations. the amount is split in to the next sections:
. thought of adhesion
. Metering and allotting
. layout and calculation of bonded joints
. warmth strong adhesives
. UV curing
. versatile bonding and sealants
Each contributing writer is a scientist, practitioner, engineer, or chemist with an abundance of functional adventure of their respective box, making this article an authoritative reference resource for any fabrics scientist or engineer, no matter if in academia or
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Extra resources for Adhesives and Sealants: General Knowledge, Application Techniques, New Curing Techniques
Introduction Physical adsorption contributes to all adhesive bonds and so is the most widely applicable theory of adhesion. The basis for adsorption is that van der Waals forces, which occur between all atoms and molecules when they are close together, exist across interfaces. These are the weakest of all intermolecular forces, but their strengths are more than adequate to account for the strengths of adhesive joints. van der Waals forces are of three types, namely the forces of attraction between molecules with permanent dipoles, those between a permanent dipole and a nonpolar molecule, and those between nonpolar molecules.
The strengths of covalent bonds are typical for bonds of these particular types. It is a possibility that C–O bonds are formed when isocyanate adhesives are used on substrates with hydroxyl groups such as wood and skin. The Si–O bond is formed when silane coupling agents are used on glass. Hydrogen bonds involving fluorine are stronger than other types, and this is because fluorine is the most electronegative element; the values listed here are taken from Jeffrey . The data for Lewis acids and bases are actually enthalpies of mixing and are taken from Drago, Vogel et al.
2. Other Coupling Agents Coupling agents based on titanium and zirconium have been used to improve adhesive properties between polymers and filler-particles and to treat aluminium alloy for adhesive bonding . Like the silanes, they react with surface hydroxyl groups as shown below, but there is no condensation polymerisation to produce a polymer network at the interface. R′−OTi(OR)3 + surface–OH = surface–OTi(OR)3 + R′OH 1372 1293 CH bend 1163 Si–O–CH2 1097 –O–C– 1071 Si–O–C J. Comyn 880 Si H bend 2191 Si H str 2920 CH str CH3/CH2 1450 3645 OH str 8 4000 cm−1 2000 1000 600 Figure 3: Inelastic electron tunnelling spectrum of triethyoxysilane on aluminium oxide .
Adhesives and Sealants: General Knowledge, Application Techniques, New Curing Techniques by Philippe Cognard