Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Key Laboratory of Biomass Energy and Material, Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Laboratory for Biomass Chemical Utilization, Nanjing 210042, Jiangsu Province, China.
College of Chemical Engineering, Nanjing Forestry University, Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Nanjing 210037, Jiangsu Province, China.
Carbohydr Polym. 2021 Dec 1;273:118529. doi: 10.1016/j.carbpol.2021.118529. Epub 2021 Aug 4.
Self-healing siloxane elastomers with high ductility can be developed for the manufacture of wearable and flexible electronic devices. However, the poor mechanical properties of self-healing siloxane elastomers limit their industrial applications. Herein, the mechanical and self-healing properties of siloxane elastomers were improved using 3-isocyanatepropyltrimethoxysilane modified (ICNCs) as a crosslinking agent and nanofiller. ICNCs increased the tensile strength and shear strength of siloxane elastomers by 54% and 68.6%, respectively. Significantly, ICNCs decreased the relaxation time for siloxane elastomers and reduced the activation energy for reversible siloxane equilibration from 68 kJ/mol to 38 kJ/mol. Therefore, ICNCs improve the self-healing and welding efficiency of siloxane elastomers. Furthermore, the self-healing siloxane elastomer maintained excellent mechanical properties and thermal properties after three cycles of recycling. Our research reveals that such a material can be applied to the field of recyclable self-healing products and surface adhesives.
具有高延展性的自修复硅氧烷弹性体可用于制造可穿戴和灵活的电子设备。然而，自修复硅氧烷弹性体的机械性能较差限制了其工业应用。在此，使用 3-异氰酸丙基三甲氧基硅烷改性（ICNCs）作为交联剂和纳米填料来改善硅氧烷弹性体的机械和自修复性能。ICNCs 分别将硅氧烷弹性体的拉伸强度和剪切强度提高了 54%和 68.6%。重要的是，ICNCs 降低了硅氧烷弹性体的松弛时间，并将可逆硅氧烷平衡的活化能从 68 kJ/mol 降低至 38 kJ/mol。因此，ICNCs 提高了硅氧烷弹性体的自修复和焊接效率。此外，自修复硅氧烷弹性体在经过三次循环回收后仍保持优异的机械性能和热性能。我们的研究表明，这种材料可应用于可回收自修复产品和表面粘合剂领域。
