Processable fluoropolymers with low dielectric constants: Preparation and structure-property relationships of polyacrylates and polymethacrylates

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:141611

Hu, H S W ^[1]; Griffith, J R ^[2]

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1. Geo-Centers, Inc., Fort Washington, MD (United States)
2. Naval Research Laboratory, Washington, DC (United States)

The preparation of a series of processable heavily fluorinated acrylic and methacrylic homo- and co-polymers with low dielectric constants is carried out to elucidate the structure-property relationships. The monomers were prepared through the condensation of the respective alcohols with acryloyl and methacryloyl chloride. Unlike tetrafluoroethylene, these monomers are easy to process into transparent polymers under normal conditions due to their liquid or semisolid nature. All polymers exhibit dielectric constants around 2.06-2.41 with variation within 0.03 over a frequency region of 500 MHz to 18.5 GHz. These values are very close to the minimum known dielectric constants of 2.0-2.08 for Teflon and 1.89-1.93 for Teflon AF. The factors which affect the dielectric constant include the fluorine content, the polymer type and molecular features. Lower dielectric constants are obtained as fluorine contents from polymer backbone or sidechain increase, when acrylate is replaced by methacrylate, when ether linkages are present in the fluorocarbon and when aromatic structure is symmetrically meta-substituted.

• OSTI ID: 141611
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
DIELECTRIC PROPERTIES
FLUORINATION
METHACRYLATES
MOLECULAR STRUCTURE
ORGANIC POLYMERS
POLYACRYLATES