Bonding systems disadvantages

Aminosilicone softeners are widely used for textile finishing purposes. The superior soft hand of these silicone finishes is based on the unique flexibility of the Si-O-Si bond system. A major disadvantage of conventional aminosilicone finishes is the pronounced hydrophobic character. The textile s ability to adsorb water and sweat is considerably reduced. 

Adhesion promoters added to the mixture (so-called direct bonding systems such as resorcin-formaldehyde-silica), are advantageous because the dipping process is unnecessary. Disadvantages include the high resin consumption level and the potential elastomer property changes similar to the effects of mold release agents in the mixture [32]. 

The disadvantage of molecular mechanics is that there are many chemical properties that are not even defined within the method, such as electronic excited states. Since chemical bonding tenns are explicitly included in the force field, it is not possible without some sort of mathematical manipulation to examine reactions in which bonds are formed or broken. In order to work with extremely large and complicated systems, molecular mechanics software packages often have powerful and easy-to-use graphic interfaces. Because of this, mechanics is sometimes used because it is an easy, but not necessarily a good, way to describe a system. 

Although the acrylate adhesives are readily available and studies have shown that they can produce reasonable bonding properties, they have the disadvantages of having high shrinkage, high fluid absorption, and low service temperatures. Acrylate adhesive applications would be limited. The development of EB-curable epoxy adhesives would have applications in the aerospace and automotive industry and potential wider uses. The most immediate application for these resin systems is composite repair of commercial and military aircraft. 

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