Tensile adhesion coating resins

Experiments like those described above have been performed to evaluate sodium ion barrier properties of Hitachi PIQ and DuPont PI 2540 polyimide films. Also included in the comparison were silicon nitride coatings plasma deposited in both tensile and compressive stress modes. The structure of the samples is illustrated in Figure 9. N-type, (111) oriented silicon substrates were cleaned and oxidized in dry oxygen ambient at 1100°C to form a 1060 A Si02 film. Wafers intended for polyimide characterization were coated with an organic silane film (gamma glycidal amino propyl trimethoxysilane) to promote adhesion of the polyimide to the oxide surface. The polyimide resins were spun onto the wafers at speeds to produce final... 

Because of their low viscosity, cycloaliphatic epoxies are often used to dilute other epoxy resins. These resins, however, have not achieved general importance in adhesive formulations because of relatively low tensile strength and because they do not cure well at room temperature. One major application for cycloaliphatic epoxies, however, is for adhesives and coatings that can be cationically cured by exposure to uv light. 

Dicyandiamide Latent cure Good elevated-temperature properties Good chemical resistance Good combination of tensile and peel strength Long elevated-temperature cure Insoluble in resin One-component adhesives Powder coatings Film and solid adhesives Laminates and other composites... 

The ductility of phenoxy resins resembles that of metals. They are transparent and also characterized by low mold shrinkage, good dimensional stability, and moderately good resistance to temperature and corrosion. Phenoxy resins are soluble in methyl ethyl ketone and have been used for coatings and adhesives. A typical injection-molded specimen has a tensile strength of 9000 psi, heat distortion point 86.6C at 264 psi load, and d 1.18. 

The fibres are surface treated during manufacture to prepare adhesion with the polymer matrix, whether thermosetting (epoxy, polyester, phenoUc and polyimide resins) or thermoplastic (polypropylene. Nylon 6.6, PMMA, PEEK). The fibre surface is roughened by chemical etching and then coated with an appropriate size to aid bonding to the specified matrix. Whereas composite tensile strength is primarily a function of fibre... 

The uncured adhesive was applied on the adherend in the polyamic acid stage from the solvent diglyme and then heat-cured to the polyimide resin form. Tensile lap shear sandwich specimens were prepared by bonding 13 x 2.5 x 0.1 cm Ti-6-4 coupons with a 1.3 cm overlap. Typically, the coated coupons were air dried for 30 min at room temperature and then for 30 min at 60 C. Five successive coats were applied. The panels were overlapped at room temperature, placed under a constant pressure of 50 psi, and heated to 300°C at a rate of 5°C min""l. The specimen was held at 300°C for... 

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