Journal
POLYMER CHEMISTRY
Volume 11, Issue 15, Pages 2674-2680Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0py00173b
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Funding
- Ministry of Science and Technology of China [2017YFB0404701]
- Natural Science Foundation of China (NSFC) [21774140, 21774142, 21975278]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB 20020000]
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Two fluoro-containing low dielectric polymers have been successfully prepared based on thermo-crosslinkable trifluorovinyl ether (TFVE) monomers with big tetrahedral units (adamantane and spirobifluorene). These polymers exhibit an average dielectric constant (D-k) of lower than 2.6, and the polymer with adamantane units displays the lowest D-k of 2.26 and an average dielectric loss (D-f) of 1.14 x 10(-3) at a range of frequencies from 1 to 10 MHz. In contrast, the polymer with spirobifluorene units displays a D-k of 2.54 and a D-f of 1.53 x 10(-3). Such results are attributed to the existence of intrinsic micropores produced by the big adamantane and spirobifluorene units in the polymers. Positron annihilation lifetime spectroscopy (PALS) indicates two different micropores in both the polymers, with sizes of 2.354/4.354 and 2.949/4.408 angstrom, respectively. Because the polymer with adamantane units possesses bigger pore sizes, it shows a lower dielectric constant. These data mean that the polymer with adamantane units is suitable for use as encapsulation resins of integrated circuit (IC) dies for applications in the microelectronics industry.
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