Dielectric properties of styrene/acrylate copolymer coatings formed by electrophoretic deposition on gold, aluminum alloy, and porous anodized aluminum alloy substrates
Styrene/acrylate copolymer coatings were electrophoretically deposited on four types of substrates. Processing characteristics were observed including cell voltage vs time for current densities of 0.05 to 4 mA/cm/sup 2/; polymer coating thickness vs cell voltage; and polymer coating thickness vs Coulombic consumption. Properties of the resultant polymer coatings were evaluated including breakdown voltage vs thickness; capacitance and dielectric constant; composition (from Fourier transform infrared spectroscopy); and morphology (from Scanning Electron Microscopy). Little polymeric coating deposition occurs if the current density is low. Defective coating growth occurs at high current density. The relationship between polymer thickness and cell voltage depends on the type of substrate coated and the current density used. After the initial stages of deposition, coating formation proceeds at a rate of 0.2 ..mu..m/ mA cm/sup -2/ s. Anodization occurs during electrophoretic deposition onto the aluminum alloy and the anodized aluminum alloy substrates; more anodization occurs at lower current densities and at the beginning of electrolysis. The dielectric constants and the intrinsic breakdown strength exhibited by the coatings depend on the coating thickness and on substrate type. The release of water from the coatings during the curing cycle allows coatings exhibiting breakdown a strength as high as 1000 V/..mu..m to form at cell voltages of 4 to 14 V per ..mu..m polymer coating thickness.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6615212
- Report Number(s):
- SAND-85-2873; ON: DE87008885
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPOLYMERS
DEPOSITION
DIELECTRIC PROPERTIES
ALUMINIUM ALLOYS
ANODIZATION
CURRENT DENSITY
ELECTROPHORESIS
POLYACRYLATES
POLYSTYRENE
SUBSTRATES
ALLOYS
CHEMICAL COATING
CORROSION PROTECTION
ELECTRICAL PROPERTIES
ELECTROCHEMICAL COATING
ELECTROLYSIS
ESTERS
LYSIS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
SURFACE COATING
SYNTHETIC MATERIALS
360603* - Materials- Properties