A review of shape memory polymers bearing reversible binding groups

Abstract

Shape memory polymers (SMP) can be deformed to a stable, temporary shape and recovered to their original shape by applying a stimulus. These networks rely on the presence of two types of net points to establish their permanent and temporary shapes. Classical strategies to stabilize temporary shapes rely on cooling below T g /T m where macromolecules become pinned in a stressed state. Recovery of the SMP usually involves heating to above the transition temperature where the permanent shape is remembered. Employing reversible binding groups (RBGs) in SMPs has emerged as an alternative strategy for stabilizing temporary shapes or imparting recyclability of the permanent shape. The use of dynamic chemistry often engenders additional functionality such as intrinsic self-healing characteristics or alternative shape recovery triggering strategies. SMPs bearing both supramolecular and covalent RBGs will be reviewed with an emphasis on hydrogen bonding, ionic interactions, metal-ligand coordination, and dynamic covalent exchange and addition reactions.

Macroscopic and microscopic shape memory effects of block copolymers prepared via ATRP

“…BCPs have attracted broad attention due to their precisely tunable structure, as well as the ability to prepare BCPs targeting a broad range of potential applications . To date, a variety of synthetic strategies have been developed for synthesis of BCPs.…”

An “Off‐the‐Shelf” Shape Memory Hydrogel Based on the Dynamic Borax‐Diol Ester Bonds

“…As one of the most significant stimuli‐responsive materials, shape memory polymers (SMPs) have the property of fixing a temporary shape and recovering to its original state via the trigger of external stimuli . In recent decades, a tremendous number of researches have been conducted on the thermal‐responsive shape memory polymers, due to their great potential in biomaterials, biosensors, textile coatings, and packing materials.…”

Shape memory properties of olefin block copolymer (OBC)/poly(ɛ‐caprolactone) (PCL) blends

“…The temporary shape could be immediately restored to its permanent (original) shape after responding to the thermal stimulus. Several types of stimuli‐response SMPs were reviewed recently, which portrayed some potential applications including biomedical, textile, energy, etc …”