Download Coating Materials for Electronic Applications - Polymers, by James J. Licari PDF

By James J. Licari

This booklet explains the chemistry and houses of the most kinds of polymer coatings utilized in the electronics undefined. It outlines the easiest strategies for overlaying, cleansing, and floor training, in addition to for software and curing of coatings. And, it outlines govt rules and formula adjustments to satisfy VOC and toxicity standards. it is the first publication in a chain particularly addressing the key meeting fabrics and tactics serious to the functionality and reliability of microcircuit modules.

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In general, sulfur gases in the ambient are quite low and electronics are well packaged and stored. Several methods are used to measure the gas permeabilities of polymer films. According to ASTM D1434[18] either a manometric (M) or a volumetric (V) test method may be used. In either case, the sample film is mounted in a gas transmission cell so as to form a sealed semibarrier between the two chambers. One chamber contains the test gas at a specific elevated pressure. The second chamber is either evacuated, into which the permeation of gas is measured by an increase in pressure (Method M), or contains the gas at a lower pressure to record a change in volume (Method V).

2. [9] These methods are described in Ch. 6. 2. Factors Affecting Moisture Permeability Factor Usual Effect on Permeability Solvent entrapment Increase Plasticizers Increase Structure of film Polar, hydrophobic Polar, hydrophilic Nonpolar Decrease Increase Decrease Degree of cross-linking Decrease Crystallinity Decrease Metal Migration. Associated with moisture absorption and permeation is the ability of a coating to prevent or suppress metal migration. Metal migration, especially silver migration, occurs between closely spaced conductor lines in the presence of moisture and an applied voltage.

4. Sward hardness vs cure time for polyurethane coating. 8 Particle Shielding Although organic coatings are not generally used in hermetically sealed circuits, some NASA and military programs have required their use to assure that any particles that remain on the circuit after cleaning or that may slough off after sealing do not migrate and cause electrical failures. Under vibration, impact, or acceleration, particles trapped within a hermetic seal, especially metallic electrically conductive particles, can cause shorting between conductor traces.

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