A novel epoxy vitrimer with low dielectric constant at high‐frequency

Abstract

Vitrmers are a new type of functional resins having the majority of published studies focused on reprocessing, recycling, healing, welding, and shape memory, and their mechanical properties are extensively investigated. While most of the intended applications of these vitrimers are related to elastomers and composites, little research has been published on their dielectric properties and their applications in tele‐communication fields. Herein, dielectric property of four typical epoxy‐anhydride vitrimers were investigated. Vitrimer catalyzed by Zn(Acac)2 (zinc acetylacetonate) show excellent re‐processability, which were further improved by introducing MTHPA (methyl terahydrophthalic anhydride) and styrene maleic anhydride (SMA) polymers. The modified epoxy vitrimer shows favorable Tg of 106°C and low dielectric constant (2.77 at 10 GHz). Notably, the modified vitrimer are still re‐processable and degradable due to the dynamic ester bonds, and maintains its dielectric and thermal performances after being reprocessed.

Structure and thermal behavior of biobased vitrimer of lactic acid and epoxidized canola oil

“…The chemical bonds used to achieve this dynamism include olefin metathesis, 8 disulfide exchange, 9,10 boronic ester exchange, 11 transimination reaction, 12 and transesterication reaction. 13,14…”

“…The chemical bonds used to achieve this dynamism include olen metathesis, 8 disulde exchange, 9,10 boronic ester exchange, 11 transimination reaction, 12 and transesterication reaction. 13,14 Vitrimers with dynamic transesterication reaction (DTER) are the most extensively studied by researchers because they can be applied in several types of commercial epoxy resins. DTERs occur between ester and hydroxyl bonds at elevated temperatures, altering the crosslinked structure of the material and resulting in viscous deformation of the cured material.…”