基于多种超分子相互作用的协同效应的可修复、可回收和高拉伸聚二甲基硅氧烷弹性体,Macromolecular Materials and Engineering

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基于多种超分子相互作用的协同效应的可修复、可回收和高拉伸聚二甲基硅氧烷弹性体
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2022-06-30 , DOI: 10.1002/mame.202200310
Wei‐Xiu Liu ₁ , Dan Liu ₁ , Yi Xiao ₁ , Mei Zou ₁ , Ling‐Yin Shi ₂ , Ke‐Ke Yang ₁ , Yu‐Zhong Wang ₁

Affiliation

聚二甲基硅氧烷 (PDMS) 是研究人员设计智能柔性传感器或设备的首选材料之一，因为它具有优异的链柔性以及透明、无毒和生物相容性的独特特性。为满足服务安全和长期应用的要求，可愈合PDMS基基板的开发正在蓬勃发展。然而，同时开发具有良好愈合性能、高强度、高拉伸性和高韧性的PDMS弹性体仍然是一个很大的挑战。在此，通过结合不同的超分子相互作用（包括π - π 堆积和氢键键合到基体中。这种弹性体是通过双（3-氨基丙基）封端的 PDMS、功能单体芘二醇和 1,6-二异氰酸基己烷之间的一锅缩聚反应制备的。通过改变π - π堆积到氢键的密度，可以很容易地调整机械性能和自愈性能。所得弹性体具有非常高的强度和高拉伸性，断裂强度为 7.46 MPa，断裂应变为 2174%，并且在 110°C 下 1 小时实现了几乎完全的自愈（96%）。

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Healable, Recyclable, and High-Stretchable Polydimethylsiloxane Elastomer Based on Synergistic Effects of Multiple Supramolecular Interactions

Polydimethylsiloxane (PDMS) is one of the preferred materials for researchers to design smart flexible sensors or devices due to its excellent chain flexibility as well as the unique features of transparency, nontoxicity, and biocompatibility. To fulfill the requirement of the service safety and long-term application, the development of healable PDMS-based substrates is booming. However, it is still a big challenge to develop PDMS elastomers with good healing performance, high strength, high stretchability, and high toughness simultaneously. Herein, a healable, recyclable, and highly stretchable PDMS-based elastomer is prepared by incorporating different supramolecular interactions including π–π stacking and hydrogen bonding into the matrix. This elastomer is fabricated via a one-pot polycondensation reaction among bis(3-aminopropyl)-terminated PDMS , functional monomer pyrene diol and 1,6-diisocyanatohexane. The mechanical properties and self-healing properties can be easily tuned by varying the density of π–π stacking to hydrogen bonding. The resultant elastomer exhibits very high strength and high stretchability with a fracture strength of 7.46 MPa and fracture strain of 2174%, and it achieves nearly complete self-healing (96%) at 110 °C for 1 h.

更新日期：2022-06-30

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