Multibenzocyclobutene Functionalized Silane for Low‑<i>k</i> Polyarylsilane Thermosets with Low Coefficient of Thermal Expansion and High Thermostability

Published on 2019-09-11T18:36:07Z (GMT) by
Highly cross-linked thermosets have been extensively studied for their good thermostability and low coefficient of thermal expansion (CTE). Herein, multibenzocyclobutene (multi-BCB) functionalized silane monomers and the related thermosets as polyarylsilane are reported. These silane monomers can be cured at a high temperature above 200 °C. After curing, the corresponding transparent thermosets showed good thermal property. The results indicated that more benzocyclobutene (BCB) groups on the corresponding silane monomer induced a higher cross-linked structure, which contributes to improve heat resistance, glass transition temperature (<i>T</i><sub>g</sub>), and dimensional stability. Particularly, the cured tetra­(benzocyclobutene-4-yl) silane (SiB<sub>4</sub>) showed extremely high <i>T</i><sub>g</sub> over 400 °C, high initial storage modulus, and good thermostability (<i>T</i><sub>d5</sub> = 532 °C). The cured SiB<sub>4</sub> also showed excellent thermomechanical properties with a low CTE at 24 ppm/°C. These polymers also showed good dielectric properties with a low <i>k</i> below 2.70. The low-<i>k</i> material with a low CTE may be a good candidate for high-performance composite resin matrix and high-density substrates.

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Cheng, Yuanrong; Cai, Jing; Li, Junyi; Wu, Xueliang; Shi, Yunfei; Wang, Jun (2019): Multibenzocyclobutene Functionalized Silane for Low‑k Polyarylsilane Thermosets with Low Coefficient of Thermal

Expansion and High Thermostability. ACS Publications. Collection.