Issue 30, 2024

Tailoring the cage and functionality of POSS for scalable low-dielectric and tough cyanate ester hybrid resin

Abstract

Although polyhedral oligomeric silsesquioxanes (POSSs) are ideal building blocks to reduce the dielectric constant and loss of cyanate ester (CE) resin, as well as enhancing its toughness, attention has been only focused on conventional ones with a cubic T8 cage and a high functionality of eight. Herein, 2(or 4)EGEP-POSS with a DDSQ-type cage and 2/4epoxy-functionality was synthesized. Such a rational design not only endows the two POSSs with larger hollow structures to reduce the polarization of CE, but also confers them lower functionalities favorable for preventing over-crosslinking. Thus, the low-dielectric property and toughness of CE/2(or 4)EGEP-POSS hybrid resins are further optimized. Specifically, the hybrid resin containing 2 wt% 2EGEP-POSS possesses the lowest dielectric constant of 2.49 (10 GHz), the lowest dielectric loss of 0.008 (10 GHz), and a high impact strength of 27.4 MPa (increased by 114.1%). In addition, its excellent glass transition temperature is well maintained at 279.1 °C, and its power transmission coefficient predicated by finite element simulation is up to 94.2% as a radome working at 10 GHz, which is significantly higher than that of pure CE (85.7%). Overall, this work highlights a promising structure-tailored approach using POSSs for the fabrication of high performance hybrid resin materials for application in wave-transparent fields.

Graphical abstract: Tailoring the cage and functionality of POSS for scalable low-dielectric and tough cyanate ester hybrid resin

Supplementary files

Article information

Article type
Paper
Submitted
22 Apr 2024
Accepted
21 Jun 2024
First published
22 Jun 2024

J. Mater. Chem. C, 2024,12, 11484-11496

Tailoring the cage and functionality of POSS for scalable low-dielectric and tough cyanate ester hybrid resin

Z. Zhang, Y. Zhou, Y. Cao, X. Ma, S. Wang, J. Wang, Z. Xiang, F. Chen and X. Ma, J. Mater. Chem. C, 2024, 12, 11484 DOI: 10.1039/D4TC01646G

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