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Superstretchable, Self-Healing Polymeric Elastomers with Tunable Properties

机译：具有可调节性能的超拉伸，自修复聚合物弹性体

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摘要

Utilization of self-healing chemistry to develop synthetic polymer materials that can heal themselves with restored mechanical performance and functionality is of great interest. Self-healable polymer elastomers with tunable mechanical properties are especially attractive for a variety of applications. Herein, a series of urea functionalized poly(dimethyl siloxane)-based elastomers (U-PDMS-Es) are reported with extremely high stretchability, self-healing mechanical properties, and recoverable gas-separation performance. Tailoring the molecular weights of poly(dimethyl siloxane) or weight ratio of elastic cross-linker offers tunable mechanical properties of the obtained U-PDMS-Es, such as ultimate elongation (from 984% to 5600%), Young's modulus, ultimate tensile strength, toughness, and elastic recovery. The U-PDMS-Es can serve as excellent acoustic and vibration damping materials over a broad range of temperature (over 100 degrees C). The strain-dependent elastic recovery behavior of U-PDMS-Es is also studied. After mechanical damage, the U-PDMS-Es can be healed in 120 min at ambient temperature or in 20 min at 40 degrees C with completely restored mechanical performance. The U-PDMS-Es are also demonstrated to exhibit recoverable gas-separation functionality with retained permeability/selectivity after being damaged.
机译：利用自修复化学来开发合成的聚合物材料，该材料能够以恢复的机械性能和功能性对其进行修复，这是非常令人感兴趣的。具有可调机械性能的自修复聚合物弹性体对于各种应用特别有吸引力。在本文中，据报道一系列具有脲基官能化的聚（二甲基硅氧烷）基弹性体（U-PDMS-Es）具有极高的拉伸性，自修复机械性能和可回收的气体分离性能。调整聚二甲基硅氧烷的分子量或弹性交联剂的重量比可提供所获得的U-PDMS-E可调的机械性能，例如极限伸长率（从984％到5600％），杨氏模量，极限拉伸强度，韧性和弹性恢复。 U-PDMS-E可以在很宽的温度范围（超过100摄氏度）内用作出色的隔音和减振材料。还研究了U-PDMS-Es的应变依赖性弹性恢复行为。机械损坏后，U-PDMS-E可以在环境温度下120分钟内恢复或在40摄氏度下20分钟内恢复，并具有完全恢复的机械性能。还证明了U-PDMS-E在损坏后仍具有可恢复的气体分离功能，并保留了渗透性/选择性。

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