Preparation and properties of stretchable low temperature resistant flexible epoxy resin curing agent

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer Chemistry Pub Date : 2025-05-27 DOI:10.1039/d5py00254k

Hao Li, Qiang Liu, Yiming Du, Yanyan Liu, Wei Zhang, Xingyou Tian, Hua Wang

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Abstract

Two innovative molecular design strategies for epoxy curing agents to address the inherent brittleness and cryogenic limitations of conventional epoxy systems are introduced. A silane-modified curing agent (DETA-Si) and a flexible-chain-engineered curing agent (NBO_n) were synthesized to achieve unprecedented mechanical–electrical–thermal synergies. The DETA-Si/EP composite demonstrates a record-breaking elongation at break of 125% (22× improvement over unmodified systems) while maintaining ultralow dielectric loss (tan δ < 0.04) and thermal stability (T_d = 236 °C). The NBO_n series, incorporating rigid benzene rings and tunable aliphatic chains, exhibits exceptional cryogenic resilience: 18% elongation at 298 K with >50% ductility retention after 24-hour immersion in liquid nitrogen (77 K). Conductive composites cured with EP/NBO₁₀ show stable resistance (±5%) under 30-day cryogenic exposure. Free volume engineering, validated via WLF modeling, underpins the enhanced low-temperature performance. These advancements establish a paradigm for epoxy resins in flexible electronics operating under extreme conditions, such as flexible sensors and polar climate devices.

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可拉伸耐低温柔性环氧树脂固化剂的制备及性能研究

介绍了两种创新的环氧固化剂分子设计策略，以解决传统环氧体系固有的脆性和低温限制。合成了硅烷改性固化剂（delta - si）和柔性链固化剂（NBOn），实现了前所未有的机械-电-热协同效应。delta - si /EP复合材料的断裂伸长率达到创纪录的125%（比未改性的体系提高了22倍），同时保持了超低的介电损耗(tan δ <；0.04)和热稳定性（Td = 236℃）。NBOn系列，包含刚性苯环和可调脂肪链，表现出优异的低温回弹性：298 K时伸长率为18%，在液氮（77 K）中浸泡24小时后延展性保持50%。EP/NBO10固化的导电复合材料在30天的低温暴露下表现出稳定的电阻（±5%）。自由体积工程，通过WLF模型验证，巩固了增强的低温性能。这些进步为在极端条件下运行的柔性电子产品（如柔性传感器和极地气候设备）中的环氧树脂建立了典范。

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来源期刊

Polymer Chemistry POLYMER SCIENCE-

CiteScore

8.60

自引率

8.70%

发文量

535

审稿时长

1.7 months

期刊介绍： Polymer Chemistry welcomes submissions in all areas of polymer science that have a strong focus on macromolecular chemistry. Manuscripts may cover a broad range of fields, yet no direct application focus is required.