Preparation of planar and hydrophobic benzocyclobutene‐based dielectric material from biorenewable rosin

Abstract

A rosin‐based monomer with thermally crosslinkable benzocyclobutene groups was synthesized in this study. The structure of the monomer was examined using mass spectroscopy, Fourier transform infrared spectroscopy, and nuclear magnetic resonance spectroscopy. An amorphous crosslinked network with dielectric constant of 2.71 and dielectric loss of 0.0012 at 30 MHz was formed when the monomer was polymerized at high temperature (> 200 °C). The polymer film exhibits surface roughness (Ra) of 0.337 nm in a 5.0 × 5.0 μm2 area and the water contact angle of 110°. In addition, results from thermogravimetric analysis indicate that the polymer has T5% = 402 °C, and differential scanning calorimetry measurements show that the glass transition temperature is at least 350 °C. Results from nanoindentation tests show that the hardness and Young's modulus of the polymer are 0.418 and 4.728 GPa, respectively. These data suggest that this new polymer may have potential applications in electronics and microelectronics. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48831.

Thermo-curable and photo-patternable polysiloxanes and polycarbosiloxanes by a facile Piers–Rubinsztajn polycondensation and post-modification

“…The fully cured BCB-X s showed a low dielectric constant, lower than most reported ones (mostly above 2.6, Table S2, ESI†). 19,33,39 As shown in Fig. 4a, the dielectric constants of the cured polycarbosiloxanes ( BCB-Me , BCB-Ph , BCB-F , BCB-Octyl ) were much lower than that of polysiloxane ( BCB-Fle ).…”

“…Meanwhile, the bulky trifluoropropyl prevented the accumulation of molecules and increased the free volume of molecular chains. 19,40 Although octyl and phenyl had similar steric effects to trifluoropropyl, BCB-Ph and BCB-Octyl had higher dielectric constants than BCB-F . Since being rich in C–H bonds, polycarbosiloxanes coupled with these two functional groups resulted in stronger polarizability compared with the C–F bonds.…”

Preparation and performance of low‐dielectric benzocyclobutene resins containing dicyclopentadiene

“…Monomer 3 [36] 402 2.84 PMP-BCB [37] where, E and E i are the elastic moduli (Pa) of the measured material and the indenter, respectively, and μ and μ i are the Poisson's ratio of the measured material and the indenter, respectively. E r can be regarded as the value of the elastic modulus for the indenter and the material under test, which is called the comprehensive response modulus (Pa).…”

Low-Dielectric Polymers Derived From Biomass

“…Song's group has designed two BCB-containing monomers, DA-A-BCB and DA-DBCB, based on biobased rosin (Figure 7). 96,97 The cured monomers exhibited low D k and D f , as summarized in Table 2.…”