摘要
含氢键的聚氨酯(PU)弹性体具有优异的自修复能力和力学性能.在弹性体主链和侧链引入多重氢键,构建的分级氢键体系能进一步提高自修复弹性体的综合性能.本研究制备了含草酰胺基团的扩链剂N,N-双(2-羟乙基)草酰胺(BHO)和含四重氢键的扩链剂1(6-(3-(1,3-二羟基-2-甲基丙烷-2-基)脲基)己基)-3-(6-甲基-4-氧-1,4-二氢嘧啶-2-基)脲基(UPy-(OH)_(2)),基于2种扩链剂的复配合成了一系列含分级氢键的聚氨酯弹性体(PU-Bx Uy).通过调控2种扩链剂的比例,探究侧链UPy含量对弹性体性能的影响.结果表明:相较于未引入侧链UPy基团的PU-B,引入适量侧链UPy基团的PU弹性体(PU-B8U2),其强度由(22.21±1.67)MPa增加到(40.62±3.46)MPa.韧性由(87.44±4.43)MJ·m^(-3)提升到(156.11±5.31)MJ·m^(-3).除此之外,PU-B8U2在100℃下30 min内可实现划痕修复完全.并且在100℃下修复1 h后,PU膜的修复效率达到89.4%.
The hydrogen-bonded polyurethane(PU)elastomers possess excellent self-healing ability and mechanical properties.By introducing multiple bonds into the main chain and side chains of the elastomers,the hierarchical hydrogen-bonding system can further improve the comprehensive performance of the self-healing elast.In this work,the chain extenders N,N-bis(2-hydroxyethyl)oxamide(BHO)and 1-(6-(3-(1,3-dihydroxy-2-methylpropane-2-yl)ureido)hexyl)-3-(6-methyl-4oxo-1,4-dihydropyrimidine-2-yl)urea(UPy-(OH)_(2))were prepared,and a series of PU elastomers with hierarchical hydrogen bonds(PU-BxUy)were synthesized by using the two chain extenders.The effects of the content of side UPy groups on the properties of the elastomers were investigated by adjusting the ratio of the two chain extenders.The results showed that,compared with PU-B side chain UPy groups,the strength of the PU elastomer with an appropriate amount of side chain UPy groups(PU-B8U2)increased from(22.21±1.67)MPa to(40.62±3.46)MPa,and the toughness was improved from(87.44±4.43)MJ·m^(-3) to(156.11±5.31)MJ·m^(-3).In addition,PU-B8U2 can achieve complete scratch healing within 30 min at 100℃.Moreover,the healing efficiency of the film can reach 89.4%after 1 h at 100℃.
作者
熊勇
姜昀良
董育民
邓景月
周建萍
周炳华
梁红波
Yong Xiong;Yun-liang Jiang;Yu-min Dong;Jing-yue Deng;Jian-ping Zhou;Bing-hua Zhou;Hong-bo Liang(College of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063;Hubei Sanjiang Aerospace Jiangbei Mechanical Engineering Co.,LTD.Xiaogan 432000;Suzhou Jiyi Technology Co.,LTD.,Suzhou 215009;College of Chemical Engineering,Jiangxi Normal University,Nanchang 330022)
出处
《高分子学报》
北大核心
2025年第3期487-500,共14页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号52463010,52103261,52163004,52063022)资助。
关键词
聚氨酯
弹性体
氢键
微相分离
自修复
Polyurethane
Elastomer
Hydrogen bond
Microphase separation
Self-healing
