基于多重氢键的自修复超分子聚氨酯弹性体  

Self-Healing Supramolecular Polyurethane Elastomers Based on Multiple Hydrogen Bonds

作　　者：何宇飞 游正伟[1] HE Yufei;YOU Zhengwei(Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine,Research Base of Textile Materials for Flexible Electronics and Biomedical Applications of China Textile Engineering Society,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201600,China)

机构地区：[1]东华大学材料科学与工程学院,纤维材料改性国家重点实验室、中国纺织工程学会柔性电子生物医用纺织材料科研基地、上海纳米生物材料与再生医学工程技术研究中心,上海201600

出　　处：《中国材料进展》2024年第2期136-141,共6页Materials China

基　　金：国家自然科学基金项目(52173117);上海市自然科学基金项目(20ZR1402500)。

摘　　要：多重氢键是一类具有较高结合强度及动态可逆性质的超分子作用,在线型聚合物中可形成物理交联网络,提高材料机械强度的同时赋予材料良好的自修复能力。以聚四氢呋喃、六亚甲基二异氰酸酯、2,4-二氨基-6-羟基嘧啶为原料,合成了具有多重氢键物理交联结构的聚氨酯。当聚四氢呋喃与扩链剂2,4-二氨基-6-羟基嘧啶的物质的量的比为7∶3及5∶5时,可得到兼具力学强度与自愈能力的超分子聚氨酯弹性体。利用核磁共振氢谱、红外光谱、凝胶渗透色谱、差示扫描量热分析、流变测试表征了弹性体的结构和基本性质。通过对2组弹性体力学性能及自愈性能的比较发现,不同的组成比例改变了多重氢键形成的物理交联强度及分子链的运动能力,聚四氢呋喃与扩链剂物质的量的比为7∶3时,材料具有较高的断裂伸长率(1280%);物质的量的比为5∶5时,材料在循环拉伸中具有更好的形变回复能力,应力松弛更慢;两组弹性体在60℃环境下均表现出一定的自修复能力。Multiple hydrogen bonds are a kind of supramolecular interactions with high bonding strength and dynamic reversibility,which can form physical cross-linking networks in linear polymers to improve the mechanical strength of materials and endow them with good self-healing ability.Polyurethane with multiple hydrogen bond physical crosslinking structure was synthesized from polytetrahydrofuran,hexamethylene diisocyanate and 2,4-diamino-6-hydroxypyrimidine.When the molar ratios of polytetrahydrofuran and chain extender 2,4-diamino-6-hydroxypyrimidine were 7∶3 and 5∶5,supramolecular polyurethane elastomers with mechanical strength and self-healing ability were obtained.The chemical structure and basic properties were characterized by 1H-NMR,IR,gel permeation chromatography,differential scanning calorimetry and rheological test.Comparison of the mechanical and self-healing properties of two groups of elastomers revealed that the different composition altered the physical crosslinking density of multiple hydrogen bonds and the mobility of the molecular chain.When the mole ratio of polytetrahydrofuran and chain extender was 7∶3,material had higher elongation at break(1280%);when the molar ratio was 5∶5,the material had better deformation recovery ability during cyclic stretching,and the stress relaxation was slower;both groups of elastomers showed definite self-healing ability at 60℃.

关 键 词：多重氢键 聚氨酯 自修复 超分子 弹性体 

分 类 号：TQ334.9[化学工程—橡胶工业]