Multistructural Network Design Enables Polybenzoxazine to Achieve Low-Loss-Grade Super-High-Frequency Dielectric Properties and High Glass Transition Temperatures

作者：Ming Zeng, Dengru Tan, Zijian Feng, Jiangbing Chen, Xiang Lu, Yiwan Huang, Qingyu Xu · 发表于：Industrial & Engineering Chemistry Research · 年份：2021 · DOI：10.1021/acs.iecr.1c03846 · 被引用次数：37 · 研究领域：Epoxy Resin Curing Processes、Synthesis and properties of polymers、Liquid Crystal Research Advancements

An original design strategy for the preparation of thermosetting resins with both super-high-frequency low dielectric constant ( k ) and low dielectric loss ( f ) as well as high glass transition temperature ( T g ) values is presented. The key to this design strategy is incorporating a bulky group and reactive furan ring to increase the free volume and the cross-linking density, respectively. The formed multistructural networks (relatively dense near furan rings and relatively loose near bulky groups) are beneficial not only for lowering k values but also for maintaining high T g s of main-chain benzoxazine copolymers. More importantly, the optimized copolymers possess low f values (≤0.008) under 5 and 10 GHz, satisfying the requirement of super-high-frequency communications. The correlations between the free volume and thermal and dielectric properties are also discussed to understand the synergistic mechanism. The work opens a new route for the structural design and preparation of super-high-frequency low dielectric functional polymeric materials.