TY - JOUR
T1 - Dielectric properties and relaxation behavior of polymethylsiloxane-imide films
AU - Wang, Huimin
AU - Tao, Xiaoming
AU - Newton, Edward
PY - 2003/1/1
Y1 - 2003/1/1
N2 - We have investigated the dielectric properties, dielectric relaxation behavior, electric conduction and kinetic characteristics of polysiloxane-imide films. The addition of siloxane is a very effective way to reduce the dielectric constant (ε′) of polyimides. For example, polysiloxane-imide [BPDA + siloxane] has a very low dielectric constant of 2.66, compared to normal polyimides such as Upilex-S [BPDA + p-PDA] with a dielectric constant of 3.47. The dielectric relaxation behavior of polysiloxane-imide is quite similar to that of fluorine-containing polysiloxane-imide. As frequency increases, the transition peaks of polysiloxane-imide move toward high temperature and the α relaxation strengths decrease. The β peak corresponds to the β dipolar relaxation whereas the α peak is due to the conductive effects in the bulk and the α dipolar relaxation. The activation energy of the α transition decreases with increasing frequency, while the activation energy of the β transition does not vary with frequency. The α peak is reduced with the increase of frequency, while the value of the β peak hardly changes with frequency.
AB - We have investigated the dielectric properties, dielectric relaxation behavior, electric conduction and kinetic characteristics of polysiloxane-imide films. The addition of siloxane is a very effective way to reduce the dielectric constant (ε′) of polyimides. For example, polysiloxane-imide [BPDA + siloxane] has a very low dielectric constant of 2.66, compared to normal polyimides such as Upilex-S [BPDA + p-PDA] with a dielectric constant of 3.47. The dielectric relaxation behavior of polysiloxane-imide is quite similar to that of fluorine-containing polysiloxane-imide. As frequency increases, the transition peaks of polysiloxane-imide move toward high temperature and the α relaxation strengths decrease. The β peak corresponds to the β dipolar relaxation whereas the α peak is due to the conductive effects in the bulk and the α dipolar relaxation. The activation energy of the α transition decreases with increasing frequency, while the activation energy of the β transition does not vary with frequency. The α peak is reduced with the increase of frequency, while the value of the β peak hardly changes with frequency.
KW - Dielectric relaxation behavior
KW - Electric conduction and kinetic characteristics
KW - Low dielectric constant
KW - Polysiloxane-imide
UR - http://www.scopus.com/inward/record.url?scp=0037335487&partnerID=8YFLogxK
U2 - 10.1177/095400830301500105
DO - 10.1177/095400830301500105
M3 - Journal article
SN - 0954-0083
VL - 15
SP - 91
EP - 103
JO - High Performance Polymers
JF - High Performance Polymers
IS - 1
ER -