生物基席夫碱自修复聚氨酯的制备与性能研究
Preparation and Properties of Bio-based Schiff Base Self-repairing Polyurethane
樊旭 1董阜豪 2刘鹤 2蒋建新 3宋湛谦2
作者信息
- 1. 中国林业科学研究院 林产化学工业研究所;江苏省生物质能源与材料重点实验室;国家林业和草原局林产化学工程重点实验室;林木生物质低碳高效利用国家工程研究中心;江苏省林业资源高效加工利用协同创新中心,江苏 南京 210042;北京林业大学 材料科学与技术学院,北京 100083
- 2. 中国林业科学研究院 林产化学工业研究所;江苏省生物质能源与材料重点实验室;国家林业和草原局林产化学工程重点实验室;林木生物质低碳高效利用国家工程研究中心;江苏省林业资源高效加工利用协同创新中心,江苏 南京 210042
- 3. 北京林业大学 材料科学与技术学院,北京 100083
- 折叠
摘要
动态共价键是一种能在特定条件下断开并复原的化学键.其中,席夫碱是一种由醛和胺类化合物缩合形成的动态共价键.通过1,8-对䓝烷二胺(MD)的氨基与香草醛的醛基反应合成了一种生物基席夫碱化合物(MV/S),用乙二胺代替MD合成了无脂肪环的席夫碱化合物(EV/S),并以MV/S和EV/S为扩链剂制备了自修复的席夫碱聚氨酯膜(PU/SM和PU/SE),同时以不添加MV/S和EV/S时制备的不含席夫碱的聚氨酯(PU/BDO)为空白对照探讨MD对自修复聚氨酯性能的影响,采用多种测试方法对聚氨酯的结构、力学性能和自修复性能进行分析.研究结果表明:PU/SM的拉伸强度为30.7 MPa,与PU/BDO相比,拉伸强度提高了20.1 MPa.TG/DTG分析发现:MD的引入能显著提高PU/SM的耐热性;在相同温度下对比发现,PU/SM的松弛时间相比PU/SE明显减小,说明MD的引入促进了动态共价键的交换速率.与PU/SE相比,PU/SM的松弛速率较快,并且活化能(Ea)降低了35.84 kJ/mol.自修复性能测试结果表明:与PU/BDO和PU/SE相比,PU/SM具有更优异的自修复性能,剪断后的PU/SM膜在80℃加热24h的自修复率达到了77%.
Abstract
Dynamic covalent bonds were a type of chemical bond that can be broken and restored under specific conditions.Among them,Schiff base was a dynamic covalent bond formed by the condensation of aldehydes and amine compounds.A bio-based Schiff base compound(MV/S)was synthesized by the reaction between the amine group of 1,8-p-menthanediamine(MD)with the aldehyde group of vanillin.A Schiff base compound(EV/S)without aliphatic ring was synthesized by replacing MD with ethylenediamine.Using MV/S and EV/S as chain extenders,the self-healing Schiff base polyurethane films(PU/SM and PU/SE)were prepared,At the sametime,the polyurethane without Schiff base(PU/BDO)prepared without MV/S and EV/S was used as a blank control to determine the effect of MD on the properties of self-healing polyurethane.Various analytical and testing methods were employed to study the structure,mechanical properties,and self-healing performance of the polyurethanes.The results showed that the tensile strength of PU/SM was 30.7 MPa,which was 20.1 MPa higher than that of PU/BDO.TG/DTG analysis revealed that the introduction of MD significantly improved the heat resistance of PU/SM.Comparison at the same temperature showed a significant reduction in relaxation time of PU/SM compared to that of PU/SE,indicating that the introduction of MD promoted the exchange rate of dynamic covalent bonds.Compared with PU/SE,PU/SM exhibited a faster relaxation rate,and the activation energy was reduced by 35.84 kJ/mol.The results of self-healing performance tests demonstrated that PU/SM had superior self-healing properties compared to PU/BDO and PU/SE,with a self-healing rate of 77%for the sheared PU/SM film after 24 h of heating at 80℃.
关键词
1,8-对䓝烷二胺/松弛时间/自修复/环境友好Key words
1,8-mentane-p-diamine/relaxation time/self-repairing/environmentally friendly引用本文复制引用
基金项目
国家自然科学基金资助项目(32071708)
出版年
2024
国家科技期刊平台
NSTL
万方数据