EFFECTIVE DIELECTRIC CONSTANT OF COMPOSITE PACKAGING MATERIALSAuthors: Michael Todd and Frank Shi
Company: University of California
Date Published: 12/3/2002 Conference: NEPCON West - Fiberoptic Expo
Towards this goal, a general framework for understanding the dielectric properties of packaging materials was recently developed in which the dielectric constant of polymer-ceramic composite materials is characterized by the electrical properties of the polymer phase, the filler phase and an interphase region within the composite system. We have investigated the dielectric properties of the polymer-filler interphase region, which represents a region of polymer surrounding and bonded to the surface of each filler particle having unique dielectric and physical characteristics.
Bringing together the atomistic characteristics of molecular dipole polarization and interfacial chemical bonding with macroscopic dielectric qualities has allowed us to begin to define a comprehensive model to understand the properties of polymer materials at bonding interfaces. Our results show that the interphase region surrounding the filler particles of polymer-ceramic composites possess a dielectric constant less than that of the bulk polymer matrix.
Furthermore, the value of the dielectric constant of the interphase region can be explained by the change in chemical polarizability of the polymer caused by the chemical bonding of the polymer to the filler particle surface. These results are supported by experimental evidence and lay the groundwork for a comprehensive explanation and determination of the overall effective dielectric properties of packaging materials for a wide range of electrical, electronic and RF applications.
Key words: dielectric constant, interphase, composite.
Members download articles for free:
Not a member yet?
What else do you get when you join SMTA? Read about all of the benefits that go along with membership.
Notice: Sharing of articles is restricted to just your immediate work group. Downloaded papers should not be stored on an external network or shared on the internet.