R值对含二硒键聚氨酯自修复性能的影响  

Effect ofthe R value on the self-healing property of polyurethane containing diselenide bonds

作　　者：田千俊 王淋 黄志超[1] 沈连根 戚栋明[1,3] TIAN Qianjun;WANG Lin;HUANG Zhichao;SHENG Liangen;QI Dongming(College of Textile Scienceand Engineering(International Institute of Silk),Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Hexin Technology Co.,Ltd.,Jiaxing 314003,China;Zhejiang Provincial Key Laboratory of Green Cleaning Technology and Washing Supplies,Lishui 323000,China)

机构地区：[1]浙江理工大学纺织科学与工程学院(国际丝绸学院),杭州310018 [2]浙江禾欣新材料有限公司,浙江嘉兴314000 [3]浙江省绿色清洁技术及洗涤用品重点实验室,浙江丽水323000

出　　处：《现代纺织技术》2023年第5期106-116,共11页Advanced Textile Technology

基　　金：浙江省科技厅公益项目(LGG22E030011);浙江理工大学科研启动项目(19012095-Y)。

摘　　要：通过绿色环保方式制备机械性能良好的自修复型聚氨酯(PU)新材料在智能纺织、高端皮革、柔性电子等领域具有广泛应用前景。采用无溶剂法,调整异氰酸根基团与羟基比值(R值)制备一系列含二硒键的PU,探究R值对PU自修复性能的影响机理。结果表明:PU分子链中的二硒键、分子间交联以及氢键作用是R值影响其自修复性能的根本原因。当R值从0.90增至1.10时,PU的拉伸强度逐渐增大,常温可见光条件下PU自修复能力呈先增后减的趋势;自修复后的PU伸长率和修复效率呈下降趋势。当R值为1.05时,修复后PU拉伸强度最高达到2.13 MPa;当R值为1.10时,相比较原始PU样品(拉伸强度为2.47 MPa),修复后PU拉伸强度降至2.05 MPa,自修复能力明显下降。研究结果为自修复PU的制备和应用提供有效参考。The polyurethane(PU)resin,synthesized from isocyanate,polyol and small molecule chain extender,is a kind of polymer compound with carbamate groups on the main chain.It can be made into plastics,fibers,elastomers and adhesives,etc.,and has a wide application prospect in intelligent textiles,high-end leather and flexible electronics.However,the PU resin is prone to damage during use,which affects the service life of the material.Therefore,the development of self-healing PU will have broad application prospects.A large number of toxic and harmful solvents are used in the conventional PU preparation methods.The evaporation of solvents during the preparation process causes environmental pollution,or the residual organic solvents in the final products affect the use safety of consumers.In this scheme,a new type of PU material with self-healing function was prepared by an innovative green and environment-friendly solvent-free method.To achieve its self-healing performance,the diselenide bond was introduced into the soft segment structure of the macromolecule.Since the diselenide bond is a dynamic covalent bond,it is characterized by the reversible reaction that can be triggered under the visible light irradiation condition for exchange recombination,so that the material has self-healing ability.In this paper,the influence of the R value on the self-healing and mechanical properties of PU was explored by adjusting the value of R under the condition that the content of the diselenide bond in the material was unchanged.The results show that as the R value increases from 0.90 to 1.10,the tensile fracture strength increases,while the elongation at break decreases.When R value is less than 1.00,the molecular structure of PU presents linear macromolecules,and the molecular chains of PU are easy to slip during tensile process.The mechanical strength of PU is low,and the elongation at break is large.When the R value is equal to 1.00,the molecular weight of PU is larger,the molecular structure of the synthesized PU is more comple

关 键 词：聚氨酯 自修复 无溶剂 R值 二硒键 

分 类 号：TQ334.1[化学工程—橡胶工业]