Novel Hyperbranched Polyphenylsiloxane-Modified Epoxy Resin Achieves Dielectric Constant of 2.82 and Dissipation Factor of 0.02050 at 100 MHz for Electronic Packaging

September 13, 2026

ACS Publications USA

Overview

A new facile method has been reported for constructing hyperbranched polyphenylsiloxane (HBPSi)-modified epoxy resins with excellent low dielectric properties for electronic packaging. The developed DGEBA/HBPSi/MeTHPA resin demonstrated a remarkably low dielectric constant (Dk) of 2.82 and a dissipation factor (Df) of 0.02050 at 100 MHz. This composite also showed significant improvements in impact strength, flexural strength, and elongation at break compared to pure epoxy, promising enhanced reliability and performance for next-generation electronic devices.

In Depth

Key Findings

A novel and facile synthetic route has been established for hyperbranched polyphenylsiloxane (HBPSi)-modified epoxy resins, exhibiting superior low dielectric properties and enhanced mechanical performance tailored for electronic packaging applications. The synthesized DGEBA/HBPSi/MeTHPA resin achieved an exceptionally low dielectric constant (Dk) of 2.82 and a dissipation factor (Df) of 0.02050 at 100 MHz. These values represent a critical advancement for next-generation electronic devices demanding high-speed and high-frequency signal processing, such as 5G communication systems and AI accelerators.

Technical / Clinical Details

The research involved the efficient incorporation of hyperbranched polyphenylsiloxane (HBPSi) into a bisphenol A diglycidyl ether (DGEBA)-based epoxy resin, cured with methyltetrahydrophthalic anhydride (MeTHPA). The introduction of HBPSi structures within the epoxy matrix leads to the formation of siloxane bonds, which significantly improve the dielectric performance. The low polarity and increased free volume contributed by the siloxane linkages are instrumental in reducing both the dielectric constant and dissipation factor. At 100 MHz, the Dk was measured at 2.82 and Df at 0.02050, demonstrating performance comparable to, if not superior to, existing high-performance epoxy systems. Furthermore, the flexible hyperbranched architecture of HBPSi optimizes the crosslink density of the resin, resulting in substantial improvements in impact strength, flexural strength, and elongation at break compared to the neat epoxy resin. This dual enhancement in electrical and mechanical properties ensures greater reliability and durability for electronic packages.

Background & Context

The escalating demands for faster data rates and higher operational frequencies in modern electronics, driven by advancements in 5G, Beyond 5G, AI, and data center technologies, highlight the critical need for advanced dielectric materials. Dielectric loss in printed circuit boards (PCBs) and semiconductor packaging substrates has become a major bottleneck limiting the overall performance of devices. Traditional epoxy resins, while offering excellent mechanical strength, adhesion, and electrical insulation, exhibit high dielectric constants and dissipation factors at high frequencies. The development of low dielectric materials is paramount for minimizing signal delay, reducing power consumption, and controlling heat generation. This research addresses this technological gap, providing a transformative solution that enables the next wave of high-performance electronic devices.

Strategic Significance & Outlook

This novel HBPSi-modified epoxy resin holds immense promise for a wide range of high-performance and high-reliability electronic applications, including high-frequency communication modules, substrate materials for high-speed CPU/GPU packages, millimeter-wave radar systems, and automotive ECUs. Future efforts will focus on optimizing manufacturing processes for mass production and conducting extensive long-term reliability assessments. Additionally, ongoing research is expected to explore further refinements in dielectric properties and improvements in thermal conductivity through advanced composite material design. This innovation is poised to strengthen the synergy between materials science and the electronics industry, contributing significantly to global competitiveness in advanced electronics.

Source: https://pubs.acs.org/aapmcd/article/6/23/14648/355447/Facile-Construction-of-Hyperbranched

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