Abstract
The matrix’s dielectric constant can be reduced with little quantity of POSS because of its unique cage skeleton structure and remained air in the caves. After epoxied, epoxy polyhedral oligomeric silsesquioxane (EPPOSS) promoted its compatibility with bisphenol A cyanate ester (BADCy) and bisphenol A benzoxazine (BA-a) by a curing processing between BADCy and EPPOSS and further copolymerizing with ring opened BA-a. Consequently, two Tgs were observed in the integrated nanocomposite, attributing to the BADCy homopolymer and the BADCy and BA-a copolymer. The more quantity of EPPOSS, the lower dielectric constants of nanocomposites achieved, as well as the initial storage modulus and Tgs due to the flexible ether bonds generated by EPPOSS. With up to 15 wt.% EPPOSS, the dielectric constant decreased to 2.72 at 1 MHz. The toughness and thermal stability of the nanocomposites also enhanced through increased the crosslinking density and inorganic Si–O–Si framework of EPPOSS.
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Acknowledgements
Thanks to Ying Tang, Zhehan Yang and Zhaomin Li for their assistance in characterizations. Thanks to Dr. Shiyun Meng for his assistance in English writing. This work is supported by the National Natural Science Foundation of China (42172321, 51403025), Chongqing Science and Technology Commission (cstc2021jsyj-yzysbAX0012, cstc2019jscx-msxmx0050), Chongqing Municipal Education Commission (KJQN202100830, KJZD-K202200807), Chongqing Technology and Business University (1952015).
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Li, X., Liu, X., Feng, J. et al. A research on benzoxazine/cyanate ester/epoxy POSS nanocomposite with low dielectric constant and improved toughness. Polym. Bull. 80, 12989–13004 (2023). https://doi.org/10.1007/s00289-023-04694-9
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DOI: https://doi.org/10.1007/s00289-023-04694-9