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Self-healing polymer materials have the functional characteristics of curing when a crack penetrates the material. Damage response, healing ability and healing performance are the most important healing characteristics of a self-healing material. Self-healing in a material system is employed through different methodologies, such as capsulation, vascular filling and intrinsic healing systems. The most challenging factor in fabrication of self-healing material is the ‘carrier filling’ in both the vascular and capsule type healing methods. The self-healing is either autonomic or external, depending on the actuation of the healing. This paper reviews the healing agent carrier preparation for vascular self-healing systems and compares the vascular healing system with intrinsic self-healing. The review revealed that, in most cases, preparation of healing agents is challenging greater than understanding the healing mechanism. The behaviour of self-healing material under fatigue, impact, and ballistic characterisation is also reviewed towards suggesting the self healing materials for aerospace applications.

Corrosion is a natural phenomenon which significantly deteriorates metal properties. The existing corrosion protection methods are costly and require a regular replacement of sacrificial metals or inevitable use of toxic chemicals. So far, various extrinsic self-healing approaches have been attempted to prevent metal corrosion, which have facilitated the corrosion protection at a reasonable cost and non-toxicity level. Here, we review the existing and the recent novel corrosion-protective extrinsic self-healing technologies, focusing on the capsule-based and the fiber-based self-healing approaches, while looking at the pros and cons of these methods. In addition, by introducing potential ways, this review aims to provide insights for the further development of extrinsic self-healing technologies. [ABSTRACT FROM AUTHOR]