基于多异氰酸酯不同配比的可愈合聚合物力学和自愈性能研究  

Mechanical and Self-healing Properties of Healable Polymers Based on Different Ratios of Polyisocyanates

作　　者：董育民 李俊[1] 姜昀良 梁红波[1] Dong Yuming;Li Jun;Jiang Yuliang;Liang Hongbo(Nanchang Hangkong University,Nanchang 330000,China)

机构地区：[1]南昌航空大学,江西南昌330000

出　　处：《广东化工》2023年第8期27-30,共4页Guangdong Chemical Industry

基　　金：江西省教育厅青年基金(GJJ190519)。

摘　　要：随着服役时间的推移,材料会经历明显的磨损。因此,柔软且具有高断裂能的自修复可拉伸材料,同时具有较高的损伤容忍度或不扩展的小裂纹,是满足材料可靠性的基本要求。然而,一些弹性体特别是自修复聚合物大多是粘弹性的,缺乏高机械韧性。通过合理设计的多强度氢键相互作用和基于Diels-Alder反应的高分子材料。傅里叶红外光谱、万能试验机、偏光显微镜、流变仪,分析表征了产物结构和材料的力学性能、自愈合性能。结果表明:MDI∶IPDI=3∶1具有优异的力学和自修复性能,拉伸强度可达5 MPa,通过调控异氰酸酯的配比含量,实现了120℃下3 min的划痕快速修复,可以看到聚合物中的超分子网络和DA结构实现了优异的机械性能和自修复性能。Materials are subject to considerable wear and tear over time.Self-repairing stretchable materials that are soft and have high fracture energy,along with a high tolerance to damage or small cracks that do not extend,are therefore essential to meet the requirements for material reliability.However,some elastomers,especially self-repairing polymers,are mostly viscoelastic and lack high mechanical toughness.Here,the polymeric materials are based on the rational design of multi-strength hydrogen bonding interactions and the Diels-Alder reaction.The product structure,mechanical and self-healing properties of the materials were analysed and characterised using Fourier infrared spectroscopy,universal testing machine,polarised light microscopy and rheometer.The results show that MDI∶IPDI=3∶1 has excellent mechanical and self-healing properties with tensile strength up to 5 MPa,and the rapid scratch repair at 120℃for 3 min was achieved by adjusting the proportional content of isocyanate,and it can be seen that the supramolecular network and DA structure in the polymer achieve excellent mechanical and self-healing properties.

关 键 词：聚氨酯弹性体 多异氰酸酯 力学性能 自修复 DIELS-ALDER反应 

分 类 号：TQ[化学工程]