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    时金凤, 赵娜, 符文鑫, 李志波. 基于可逆离子氢键构筑室温快速自修复聚硅氧烷弹性体[J]. 功能高分子学报, 2020, 33(5): 433-440. doi: 10.14133/j.cnki.1008-9357.20200228002
    引用本文: 时金凤, 赵娜, 符文鑫, 李志波. 基于可逆离子氢键构筑室温快速自修复聚硅氧烷弹性体[J]. 功能高分子学报, 2020, 33(5): 433-440. doi: 10.14133/j.cnki.1008-9357.20200228002
    SHI Jinfeng, ZHAO Na, FU Wenxin, LI Zhibo. A Stretchable and Rapidly Self-Healable Polysiloxane Elastomer Based on Reversible Ionic Hydrogen Bonds[J]. Journal of Functional Polymers, 2020, 33(5): 433-440. doi: 10.14133/j.cnki.1008-9357.20200228002
    Citation: SHI Jinfeng, ZHAO Na, FU Wenxin, LI Zhibo. A Stretchable and Rapidly Self-Healable Polysiloxane Elastomer Based on Reversible Ionic Hydrogen Bonds[J]. Journal of Functional Polymers, 2020, 33(5): 433-440. doi: 10.14133/j.cnki.1008-9357.20200228002

    基于可逆离子氢键构筑室温快速自修复聚硅氧烷弹性体

    A Stretchable and Rapidly Self-Healable Polysiloxane Elastomer Based on Reversible Ionic Hydrogen Bonds

    • 摘要: 以环三聚磷腈碱(CTPB)为催化剂,合成不同分子量和不同硅氧乙烯基单元摩尔分数的线型聚硅氧烷(PDMS-g-Vi)前驱体,通过硫醇-烯点击化学反应获得侧链含羧基或氨基的聚硅氧烷(PDMS-g-COOH或PDMS-g-NH2),进而利用羧基与氨基之间的离子氢键成功制备在室温条件下可快速自修复的聚硅氧烷(PDMS-g-COOH/NH2)弹性体。采用凝胶渗透色谱、核磁共振、红外光谱等确定了聚合物的组成和结构。拉伸试验结果表明:通过控制PDMS-g-Vi前驱体的分子量和乙烯基含量可调节PDMS-g-COOH/NH2弹性体的力学性能和自修复性能。在50 mm/min的拉伸速率下,弹性体的拉伸强度为230.9 kPa,断裂伸长率高达877%,在快速拉伸的条件下(200 mm/min)也显示出了较高的断裂伸长率(>500%)。此外,所制备的弹性体显示出优异的快速自修复性能,室温静置30 min后其修复效率达到99%。

       

      Abstract: A series of linear poly(dimethylsiloxane) (PDMS-g-Vi) with different vinyl contents were synthesized via ring-opening copolymerization of tetravinyltetramethylcyclotetrasiloxane (V4) and octamethylcyclotetrasiloxane (D4) catalyzed by a cyclic trimeric phosphazene base (CTPB). Further, the carboxylic acid- or amine-functionalized PDMS (PDMS-g-COOH and PDMS-g-NH2) was prepared through the thiol-ene click reaction, confirmed by gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (1H-NMR). Finally, the target silicone elastomers (PDMS-g-COOH/NH2) were prepared based on the reversible ionic hydrogen bonds between COOH and NH2 side chain groups, exhibiting remarkably fast self-healing capability at room temperature without any external stimulus. The mechanical strength, elasticity and self-healing properties of resultant elastomers could be tuned by modulating the hydrogen bonding density and the molecular weight of PDMS-g-Vi precursors. The PDMS-g-COOH/NH2 elastomer owned a breaking stress of 230.9 kPa at 877% elongation at break with a stretching speed of 50 mm/min, and the elongation at break was higher than 500% even under a fast stretching speed (200 mm/min). Moreover, its self-healing efficiency reached as high as 99% after being restored at room temperature for 30 min.

       

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