Epoxy, which exhibits tunable mechanical properties, has been investigated to overcome its inherent brittleness and extend its application range. Herein, various epoxy composites, including a toughened polymer, elastomer, and pressure-sensitive adhesive (PSA), with tunable mechanical properties were prepared by adjusting the ratio of a rigid aromatic epoxy and flexible aliphatic epoxy. A flexible aliphatic epoxy that incorporated urethane linkages was used to extend the tuning range; it was synthesized via an eco-friendly route utilizing CO₂ without isocyanate. The prepared toughened polymer-like and elastomeric epoxy composites can be used in structural epoxy adhesive (lap shear strength = 27.8 MPa) and flexible electronics (plastic strain < 10%), as confirmed through single lap shear, cyclic tensile, and Izod impact tests, respectively. The most flexible among the prepared epoxy composites exhibited PSA properties (peel strength = 6.8 N·cm⁻¹) that were comparable to those of conventional tapes. A viscoelastic window also supported that the prepared PSA can be utilized as a general-purpose PSA and a removable PSA. This work proposes a new application of eco-friendly epoxies and a strategy to facilitate the wide tuning range of epoxy materials, including PSAs.

环氧树脂具有可调节的机械性能，已被研究以克服其固有的脆性并扩展其应用范围。在此，通过调节刚性芳香族环氧树脂和柔性脂肪族环氧树脂的比例，制备了各种机械性能可调的环氧树脂复合材料，包括增韧聚合物、弹性体和压敏粘合剂（PSA）。结合氨基甲酸酯键的柔性脂肪族环氧树脂用于扩展调谐范围；它是通过使用 CO ₂的环保路线合成的不含异氰酸酯。制备的增韧类聚合物和弹性体环氧树脂复合材料可用于结构环氧树脂粘合剂（搭接剪切强度 = 27.8 MPa）和柔性电子产品（塑性应变 < 10%），通过单搭接剪切、循环拉伸和悬臂梁冲击试验证实， 分别。制备的环氧树脂复合材料中最柔韧的表现出与传统胶带相当的PSA 性能（剥离强度 = 6.8 N·cm ^-1）。粘弹性窗口也支持制备的 PSA 可用作通用 PSA 和可移除PSA。这项工作提出了环保环氧树脂的新应用和促进环氧树脂材料（包括 PSA）的广泛调整范围的策略。