Fast Healing of Polyurethane Thermosets Using Reversible Triazolinedione Chemistry and Shape-Memory
Fast Healing of Polyurethane Thermosets Using Reversible Triazolinedione Chemistry and Shape-Memory
复制标题
DOI：
10.1021/acs.macromol.8b00368
复制
发表时间：
2018-04
期刊：
影响因子：
5.5
通讯作者：
Niels Van Herck;F. D. Prez
中科院分区：
文献类型：
--
作者：
Niels Van Herck;F. D. Prez
使用基于三唑啉二酮（triazolinedione，简称TRIZ）化学的热可逆交联剂，在一锅法中制备了具有聚（ε-己内酯）软链段的可愈合和可重塑的聚氨酯网络。一个单一的加热步骤触发形状恢复和可逆的热化学，这允许快速的形状记忆辅助愈合从大规模的损害高达1毫米。网络组合物进行了优化，以最大限度地提高愈合效率。通过热分析、拉伸测量和流变学对材料的热机械性能进行了深入研究。这项工作验证了可逆可逆化学作为一种新型的，高效的化学快速内在愈合的高模量热固性材料，而不损失结构的完整性。
Healable and remoldable polyurethane networks having poly(e-caprolactone) soft segments were prepared in a one-pot procedure using a thermoreversible cross-linker based on triazolinedione (TAD) chemistry. A single heating step triggers both shape-recovery and reversible TAD chemistry, which allows fast shape-memory assisted healing from large scale damage up to 1 mm. The network compositions were optimized to maximize healing efficiency. The thermomechanical properties of the materials were studied in-depth by thermal analysis, tensile measurements, and rheology. This work validates reversible TAD chemistry as a novel, highly effective chemistry for fast intrinsic healing of high-modulus thermosets without loss of structural integrity.