文献类型：期刊文献

中文题名：基于配位键交联的自修复弹性体的合成及表征

英文题名：Synthesis and Characterization of Self-Healing Elastomers Based on Coordination Bonds

作者：柏至伟[1];张治斌[1];张雅娟[1];汪济奎[1]

机构：[1]华东理工大学材料科学与工程学院,超细材料制备和应用重点实验室,上海200237

年份：2020

卷号：33

期号：2

起止页码：180

中文期刊名：功能高分子学报

外文期刊名：Journal of Functional Polymers

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

语种：中文

中文关键词：聚二甲基硅氧烷;弹性体;配位键;自修复

外文关键词：polydimethylsiloxane;elastomer;coordination bond;self-healing

摘要：通过八甲基环四硅氧烷(D4)的开环平衡反应合成了端氨基聚二甲基硅氧烷(APTPDMS),随后将APT-PDMS与二异氰酸酯反应生成预聚体,以2,6-二氨基吡啶(2,6-DAP)为扩链剂,合成得到有机硅弹性体(PDMS-PU),最后以Fe3+进行配位交联,制备了一系列自修复有机硅弹性体(PDMS-PU/M)。通过核磁共振、红外和紫外-可见光谱、万能试验机、激光共聚焦显微镜分析表征了产物结构和材料的力学性能、自修复性能。结果表明:PDMS-PU/M具有优异的力学和自修复性能,拉伸强度可达1.96 MPa,自修复效率可达82.7%;通过控制Fe^3+的含量,改变交联密度,可以实现材料强度和柔性之间的调节。
Aminopropyl terminated polydimethylsiloxane(APT-PDMS) was synthesized by the ring-opening equilibrium reaction of octamethylcyclotetrasiloxane(D4) using 1,3-bis(3-aminopropyl)tetramethyldisiloxane as a blocking agent. The silicone elastomer(PDMS-PU) was synthesized by forming a prepolymer of diisocyanate and APT-PDMS, followed by the addition of 2,6-diaminopyridine(2,6-DAP) as a chain extender. Finally, a series of self-healing silicone elastomers(PDMSPU/M) were obtained through the formation of coordination bonds between PDMS-PU and iron ions. The structures of products were characterized by nuclear magnetic resonance(NMR), Fourier transform infrared spectroscopy(FT-IR) and ultraviolet-visible spectrophotometer(UV-Vis). Water contact angle measurement and universal testing machine were used to characterize the surface properties and mechanical properties of the materials. The self-healing performance of PDMS-PU/M was studied by laser confocal microscopy, and the mechanical properties of the healed samples were tested by universal testing machine. The results showed that the PDMS-PU/M were successfully synthesized. The hydrophobicity of the material was less affected by the modification of PDMS, and the water contact angle was higher than 90°. It had good waterproof performance. The prepared PDMS-PU/M had excellent mechanical properties and satisfactory self-healing ability. The effects of different ratios of pyridine group to iron ion contents contents on the elastomer properties were investigated. With the increasing of iron ion contents, the tensile stress of PDMS-PU/M was increased from 0.95 MPa to 1.96 MPa due to the increase in the crosslinking density between the pyridine groups and iron ions. Meanwhile, the self-healing efficiency of PDMS-PU/M with the highest tensile stress could reach 82.7% for only 6 h. These results indicated that the self-healing silicone elastomer was an ideal candidate for the self-healable flexible substrates which could be used in flexible electronics and other applications involving resources saving and environment protection. In addition, the self-healing efficiency of PDMS-PU/M could be improved by increasing the temperature, by which the repairing time decreased.