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《工程塑料应用》 2021年第02期
DOI:10.3969/j.issn.1001-3539.2021.02.006
基于两种双硫键自修复聚氨酯制备及性能
晏文康,万里鹰
南昌航空大学材料科学与工程学院,南昌 330063 
Preparation and Performance of Self-healing Polyurethane based on Two Kind of Disulfide Bonds
Yan Wenkang, Wan Liying
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China 
摘要:以异佛尔酮二异氰酸酯(IPDI)和双(2-羟基乙基)二硫醚(DTBO)为硬段,聚四氢呋喃(PTMG)为软段,β-巯基乙醇(ME)为封端剂,制备巯基封端且含双硫键的聚氨酯(PUR)预聚物,利用巯基易氧化的特点,用H2O2/NaI进行氧化,合成分子链内和分子链端均含有双硫键的自修复交联PUR。采用傅立叶变换红外光谱仪、差示扫描量热仪、热重/差热综合热分析仪和电子拉力试验机等手段,研究了PUR的结构及PTMG与ME的物质的量之比对PUR热性能、力学性能和自修复性能的影响。结果表明,合成的系列交联PUR都具有一定的自修复能力和良好的热性能,当DTBO和PTMG物质的量分数分别为总二元醇的40%和60%时,PUR的拉伸强度达到最大值,为2.6 MPa,在60℃热处理8 h条件的自修复率为80.8%,且该试样经三次自修复后,自修复率仍可达到50.0%。 
Abstract:With isophorone diisocyanate (IPDI) and double (2-hydroxy ethyl) sulfide (DTBO) as hard segment, polyethylene tetrahydrofuran (PTMG) as soft segment, β-mercaptoethanol (ME) for the end capping agent, the sulfhydryl-terminated polyurethane (PUR) prepolymer containing disulfide bonds was prepared. Sulfhydryl groups were oxidized using H2O2/NaI, and self-healing PUR with cross-linked structures were synthesized. The double sulfur bonds were existed within and at the ends of PUR molecular chains. Fourier transform infrared spectrometer, differential scanning calorimeter, thermogravimetric/differential thermal analyzer, and electronic tensile testing machine were used to research the effects of the PUR structure and ratio of PTMG and ME on the thermal, mechanical and self-healing properties of PUR. The results show that a series of cross-linked PUR synthesized has self-healing ability and good heat resistance. When amount of substance fractions of DTBO and PTMG is 40% and 60% of the total glycol respectively, the tensile strength of PUR reaches the maximum value of 2.6 MPa, and the self-healing rate of heat treatment at 60℃ for 8 h is 80.8%. After three times of self-healing of the same specimen, the self-healing rate can still reach 50.0%. 
关键词:聚氨酯;双硫键;巯基;自修复 
Keywords:polyurethane; disulfide bonds; sulfhydryl group; self-healing 
基金:上海航天科技创新基金项目(SAST2016053) 
本文引用格式:
晏文康,万里鹰.基于两种双硫键自修复聚氨酯制备及性能[J].工程塑料应用,2021,49(2):34-39.
Yan Wenkang,Wan Liying. Preparation and performance of self-healing polyurethane based on two kind of disulfide bonds[J]. Engineering Plastics Application,2021,49(2):34-39. 

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