Adhesive terminology

Several terms are used to describe important aspects of the formulation or functioning of adhesives, and of equipment for doing adhesive bonding. Some of these terms, and their definitions, are the following  

Solids content refers to the amount of the adhesive that remains after solvents or carrier liquids are removed. It is usually reported as percent solids, defined as solids/(initial weight) x 100%. 

An emulsion is a stable suspension of adhesive solids in a fluid the fluid is usually water. 

A solution is an adhesive in which the solids have been dissolved in the fluid the fluid is usually an organic liquid, not water. 

The setting time is the time required for an adhesive to form a bond sufficient to allow the bonded substrate to undergo further handling. This initial bond is generally weaker than the final bond that will develop over time. 

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In a fundamental sense, the miscibility, adhesion, interfacial energies, and morphology developed are all thermodynamically interrelated in a complex way to the interaction forces between the polymers. Miscibility of a polymer blend containing two polymers depends on the mutual solubility of the polymeric components. The blend is termed compatible when the solubility parameter of the two components are close to each other and show a single-phase transition temperature. However, most polymer pairs tend to be immiscible due to differences in their viscoelastic properties, surface-tensions, and intermolecular interactions. According to the terminology, the polymer pairs are incompatible and show separate glass transitions. For many purposes, miscibility in polymer blends is neither required nor de-... 

Test Method for Strength Properties of Adhesives in Plywood Type Construction in Shear by Tension Loading Terminology of Adhesives... 

The Adhesive The choice of the proper adhesive for one s label is quite obviously of major importance. The two t3rpes of adhesives generally used for pressure sensitive label construction are rubberbase and acrylic emulsion. In addition, most converters of label stock offer a variety of specialty adhesives to meet particularly demanding applications. Some of the terminology associated with pressure sensitive adhesives is as follows. 

Paint, see Paints and Coatings, p.l75 Pyroxylin cement, see Adhesives, p.l Self-heating, see Spontaneously Combustible Materials and Division 4.2, p.226 Solution, see Terminology, Solutions, p.247 Solvent, see Solvents, p.224 Wetted, see Terminology, Wetted, p.253... 

The LbL assembly of polymers to afford individiral nano-objects represents a imique synthetic methodology that combines features of solution- and solid-state assembly processes via selective interactions between polymers and preestablished templating substrates and, therefore, includes aspects of each of the typies of synthetic methods described in this chapter. The LbL terminology originates from the process, which involves alternating deposition of polymers and other components, having complementary functionalities to facilitate their attraction/adhesion, from solution onto a substrate to produce stable thin films. 

Concepts of Particle Adhesion. The interaction of particles with a plane surface is sometimes termed sticking, and the interaction between particles is termed agglomeration. This terminology is neither universal nor really suitable. For the sake of uniformity in terminology, and also in view of the fact that the processes taking place when films, dust particles, or powders come into contact with a solid surface are all similar in nature, we wiU use the term adhesion to denote the interaction of particles with a solid surface, and the term auto-hesion to denote the interaction of particles with each other. Questions of auto-hesive interaction will be considered in this book only when necessary in order to understand the phenomenon of adhesion. 

Every discipline develops its own specialized vocabulary and that of adhesion and adhesives is no exception. The terms relating to adhesives can be found in the glossaries of several handbooks on adhesives " the definitions most often used are based on those given in ASTM standard D-907, reproduced in Appendix I." In addition to terminology, there are a number of other topics that require some comment and these will be discussed in this introduction. They are the classification of adhesives, the selection of adhesives, and the choice of units. 

Anaerobic and structural acrylic adhesives (acrylics) are closely related members of the large acrylic adhesive family. They are reactive systems which cure by redox-initiated free radical polymerization. It is difficult to make a clear distinction between the two classes of adhesives. Many aspects of the chemistry, compositions, and terminology overlap. 

The adherend stiffness in the terminology of adhesive joints is defined as the elastic modulus ( ) times the adherend thickness (t). It is a parameter... 

ASTM D 907-lla (2011). Standard Terminology of Adhesives. West Conshohocken, PA ASTM International. 

ASTM D907-08b. (2008), Standard terminology of adhesives. ASTM,... 

The science of adhesion, or "adhesiology", started to take shape in the last decade. With the cooperation of surface scientists, polymer chemists, and rheologists, we gradually started to understand the mechanisms of adhesion. Interestingly, adhesion is a universal phenomenon which can take place even in the absence of an adhesive. New terminologies have been introduced to describe various aspects of adhesion, e.g. bio-adhesion, electro-adhesion, particle adhesion, and photo-adhesion. 

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