Sandeep Rai, Shuchi Tiwari | International Journal of Chemical Synthesis and Chemical Reactions | Vol 12, Issue 1 | ISSN: 2582-5917
Abstract
Self-healing polymeric materials are one of the most rapidly growing and technologically transformative classes of smart polymeric materials. Such materials offer the ability to autonomously repair damage and retain & restore functional performance. This capability is very important for polymers, which undergo mechanical failure, micro- cracking, delamination, photo-oxidation, or thermal degradation during service environments. The last decade has been remarkable for developments in self-healing polymers, ranging from extrinsic capsule-based approaches to fully intrinsic dynamic polymer networks which are capable of repeated & stimulus-free healing . This review delves into recent advances in the design, mechanisms, fabrication, and applications of self-healing polymers with focus on dynamic covalent chemistry, supramolecular interactions, reversible crosslinking, microvascular networks, and emerging bio-based architectures.
Key healing mechanisms are Diels–Alder reactions, disulfide exchange, transesterification, dynamic imine bonding, hydrogen-bonding, ionic interactions, π–π stacking, host–guest complexation, & metal–ligand coordination are discussed. The review also highlights how molecular re-configurability, network topology, segmental mobility, and relaxation dynamics govern healing efficiency, and how healing can be activated through heat, light, pH, moisture, electricity, magnetic fields, or completely autonomously.
Applications of self-healing polymers are rapidly growing into various applications like structural composites, coatings, biomedical implants, soft robotics, wearable electronics, 3D printing, energy storage devices, sealants, adhesives, and aerospace materials etc. Incorporation of conductive fillers, nano additives, catalytic species, and stimuli- responsive nanostructures are capable of providing excellent multi-functionality i.e. self- healing conductivity, barrier recovery, and mechanical reinforcement. However, technological challenges still remain regarding scaling up, long-term stability, healing at low temperatures, commercialization, and fundamental understanding of cause of damage evolution.
This review briefly presents an overview of state-of-the-art self-healing polymer technologies and future directions toward development and scaling up sustainable, durable, and intelligent material systems for numerous industrial applications. Focus is on emerging trends like autonomous healing, recyclable dynamic networks, vitrimer- based materials, and bio-mimetic healing strategies similar to natural systems such as skin, bone, and plant resins.
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