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Autonomic Healing of Epoxy Vinyl Esters via Ring Opening Metathesis Polymerization

机译：通过开环复分解聚合自动修复环氧乙烯基酯

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摘要

A materials system for autonomic healing of epoxy vinyl esters is demonstrated. The system is comprised of wax microspheres containing Grubbs' catalyst and microcapsules containing exo-dicyclopentadiene (DCPD) embedded together in an epoxy vinyl ester matrix. Healing is triggered when damage in the form of a crack ruptures the microcapsules, causing DCPD to be released into the crack plane where it comes in contact and mixes with the catalyst microspheres initiating ring opening metathesis polymerization (ROMP). The chemical compatibility of the catalyst with the matrix is investigated and wax protection of the catalyst via microspheres of a sufficient size (34-98 urn) is shown to provide a suitable barrier for protecting the catalyst from free radicals generated in situ during the curing of the epoxy vinyl ester resin. Wax protection of the catalyst also allows uninhibited curing of the matrix to proceed at room temperature. Concentration of self-healing components is varied with a view towards optimization of the recovery of virgin mechanical properties. Efficient self-healing is observed with microspheres that are smaller than those used in previous polymer matrices. Significant recovery of virgin mechanical properties is observed within 2.5 min of healing time at room temperature and the mechanical properties of healed samples after 24 h of healing time match those of existing ROMP-based self-healing systems.
机译：证明了用于环氧乙烯酯的自主修复的材料系统。该系统由包含Grubbs催化剂的蜡微球和包含一起嵌入环氧乙烯基酯基质中的exo-dicyclopentadiene（DCPD）的微囊组成。当裂纹形式的破坏使微囊破裂时，就会触发修复作用，从而导致DCPD释放到裂纹平面中，并与之接触并与催化剂微球混合，从而引发开环复分解聚合（ROMP）。研究了催化剂与基体的化学相容性，并显示了通过足够大小（34-98微米）的微球对催化剂的蜡保护，为保护催化剂免受固化过程中原位产生的自由基提供了合适的屏障。环氧乙烯基酯树脂。催化剂的蜡保护还允许基质在室温下不受抑制地固化。为了最优化原始机械性能的恢复，改变了自愈组分的浓度。使用比以前的聚合物基体中使用的微球更小的微球，可以观察到有效的自我修复。在室温下2.5分钟的恢复时间内观察到原始机械性能的显着恢复，并且在恢复24小时后，愈合后的样品的力学性能与现有的基于ROMP的自我修复系统相匹配。

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