Epoxy adhesives electronics

The high flame-retardation efficiency of siliconized epoxy resin cured with phosphorus diamine curative was observed mainly because of the char enrichment of phosphorus and the char protecting effect of silicone to exhibit their synergistic effect on LOI enhancement. Hence, we suggest the suitability of these matrices in the field of advanced electronics, adhesives and coatings for better performance and longevity. 

Epoxies. The unique chemical and physical properties such as excellent chemical and corrosion resistances, electrical and physical properties, excellent adhesion, thermal insulation, low shrinkage, and reasonable material cost have made epoxy resins (qv) very attractive in electronic apphcations. 

In the crosslinked state, epoxy resins are highly resistant to chemicals, temperature, and solvents and are also endowed with good electrical properties. They are therefore employed, for example, as casting resins in electro- and electronic industry as well as resistant lacquers and coatings. Moreover, they possess excellent adhesive power for many plastics, wood, and metals ( reaction adhesives two-component adhesives ). 

Dispersion forces57 , which result from temporary variations in the distribution of electron density in atoms, can account for up to 90 per cent58 of the adhesion forces between non-polar polymers and metal substrates (bond energy 0.5-5 Kcal/ mole)50 . However, for the adhesion of epoxy resins and other polar polymers to metals, dispersion forces are of secondary importance when compared to the electromagnetic and mechanical interactions discussed above. 

Both polyimides and epoxy have found widespread use in many diverse industries. Polyim-ides, due to their excellent thermal and chemical stability and low dielectric constant, have become a favorite of the electronics industry. This broad class of polymers has found widespread use in a variety of electronic applications and the low cost has made epoxy popular as matrix materials in composites, adhesives and coatings. 

The use of epoxy resins in industry extends back over fifty years since their introduction commercially and they have found an extremely wide range of applications as diverse as coatings and adhesives for electronics to use as matrix materials in aerospace composites. It is the use of advanced composites that is pressuring the advancement of epoxy science and the improvement of epoxy based... 

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