Deposition of π-Conjugated Polycyanate Ester Thin Films and Their Dielectric Properties

Plasma Chemistry and Plasma Processing - 2012
Xiong-Yan Zhao1,2, Ming-Zhu Wang3
1College of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, People’s Republic of China
2Hebei Key Laboratory of Material Near-Net Forming Technology, Hebei University of Science and Technology, Shijiazhuang, People’s Republic of China
3Hebei Province Analysis and Testing Research Centre, Hebei University of Science and Technology, Shijiazhuang, People’s Republic of China

Tóm tắt

Two kinds of novel π-conjugated polycyanate esters, namely the plasma-polymerized 4-methoxyphenol cyanate ester (PPMPCE) and the plasma-polymerized 4-phenylphenol cyanate ester (PPPPCE), were successfully prepared by plasma polymerization for the first time. The structure and compositions of both plasma polycyanate esters were investigated by Fourier Transform Infrared (FT-IR), X-ray Photoelectron Spectroscopy (XPS) and UV–Visible Absorption Spectra (UV–Vis). The results show that extensively conjugated C=N double bonds were formed in the plasma-deposited cyanate ester thin films, the plasma polymerization of both monomers proceeded mainly via the opening of π-bonds of the O–C≡N functional groups which are further on being formed into a large π-conjugated system, this unique process is noticeably different from the conventional thermal polymerization reaction of cyanate ester monomers. Further dielectric measurement shows that PPPPCE thin film gives a lower dielectric constant comparing to that of the PPMPCE film, and the dielectric constant of both plasma deposited thin films decreased with an increase in measurement frequency.

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Plasma Chemistry and Plasma Processing

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