基于芳香基双硫键的乙酸酯化纳米纤维素/聚(脲-氨酯)自愈合材料  

Esterified cellulose nanocrystals/poly(urea-urethane) self-healing materials based on aromatic disulfide bonds

作　　者：唐丽荣[1,2] 王炜彬 王清华[2] 庄森炀 陈翠霞[2] 黄彪[2] 

机构地区：[1]福建农林大学金山学院,福建福州350002 [2]福建农林大学材料工程学院,福建福州350002

出　　处：《化工进展》2017年第4期1381-1387,共7页Chemical Industry and Engineering Progress

基　　金：福建省科技厅自然科学基金(2016J01088);福建农林大学"校杰出青年科研人才"培养专项基金(xjq201422);江苏省生物质绿色燃料与化学品重点实验室开放基金(JSBGFC14016);广西林产化学与工程重点实验室开放课题(GXFC15-04)项目

摘　　要：基于芳香基双硫键,以聚丙二醇-4000(PPG-4000)和异佛尔酮二异氰酸酯(IPDI)为原料,双(4-氨基苯基)硫醚为交联剂,乙酸酯化纳米纤维素作为增强相,制备得到乙酸酯化纳米纤维素/聚(脲-氨酯)[esterified cellulose nanocrystals/poly(urea-urethane),E-CNCs/Pus]自愈合复合材料。对其力学性能、热学性能、表面化学结构、自愈合性能进行了表征研究。结果表明,E-CNCs/PUs在室温下不需其他额外条件即可实现自愈合,说明芳香基双硫键可作为动态交联键应用于自愈合聚(脲-氨酯)的设计与构建;E-CNCs添加量为0.1%时,其聚(脲-氨酯)复合材料拉伸强度达到5.71MPa,与纯聚(脲-氨酯)材料相比,增加了43.11%;E-CNCs/PUs复合材料不仅具有较高的拉伸强度,而且保持了良好的弹性和延展性;热学性能分析结果表明,E-CNCs对聚(脲-氨酯)复合材料热稳定性具有较小影响。In this study, the esterified cellulose nanocrystals/poly（urea-urethane）（E-CNCs/PUs）self-healing materials were prepared using polypropylene glycol 4000 （PPG-4000） and isophorone diisocyanate （IPDI） as raw material, bis （4-aminophenyl） sulfide as crosslinking agent, and esterified cellulose nanocrystals as reinforcement. The mechanical properties, thermal properties, surface chemical structures, and self-healing properties were investigated. The results show that E-CNCs/PUs were self-healing effectively at room temperature without any external interventions, which confirms that bis（4-aminophenyl） disulfide can be effectively used as a dynamic cross-linker for the design of self-healing poly（urea-urethane） material. The maximum tensile strength of E-CNCs/PUs could reach 5.71MPa when the additive amount of E-CNCs was 0.1%, which was increased by 43.11% compared with pure poly（urea-urethane）. E-CNCs/PUs composite materials present high tensile strength, elasticity, and malleability. The additive of E-CNCs just has a small influence on the thermal properties of E-CNCs/PUs self-healing materials.

关 键 词：芳香基双硫键 乙酸酯化纳米纤维素 聚(脲-氨酯) 自愈合 

分 类 号：TK6[动力工程及工程热物理—生物能]