Mechanically strong and stretchable PEG-based supramolecular hydrogel with water-responsive shape-memory property

Abstract

A stretchable and elastic supramolecular hydrogel with water-responsive shape-memory behavior, which can be realized under mild and green conditions, was developed.

Polydopamine Particles Reinforced Poly(vinyl alcohol) Hydrogel with NIR Light Triggered Shape Memory and Self‐Healing Capability

“…Most SM&SH hydrogels were thermally activated, but one disadvantage is that the direct heating will lead to temperature rising of the entire material . Other stimulating means such as air, water, and pH can also trigger the shape recovery, but those stimuli are limited in practical applications . In contrast, the remote stimulations such as ultrasound and light are very easy to achieve local focus and quantitative stimulation .…”

“…[21,22] Other stimulating means such as air, water, and pH can also trigger the shape recovery, but those stimuli are limited in practical applications. [23][24][25][26] In contrast, the remote stimulations such as ultrasound and light are very easy to achieve local focus and quantitative stimulation. [27,28] Previously we firstly proposed the use of therapeutic ultrasound to trigger the shape memory of a PVA hydrogel containing a small amount of melamine.…”

Non-covalent interaction cooperatively induced stretchy, tough and stimuli-responsive polyurethane–urea supramolecular (PUUS) hydrogels

“…H-bonded C=O stretching peaks from urea groups appear in the 1620-1690 cm -1 range, those non-bonded appear in the 1690-1715 cm -1 range. 24,37 As a first step in investigating the mechanical performance, strain (γ, Fig. [27][28][29][30] From Fig.…”

“…17,18 While, in nature and other self-assembly systems, hydrophobic effect can shield the H-bonds from the water and forms a more nonpolar local domain for enhancing the H-bonding interactions, yielding supramolecular hydrogels in water. 23,24 But the synthesis procedures are complicate and time consuming. Recent studies showed that chain-extension of the ureidopyrimidinone (UPy) end-functionalized PEG to multi-block architecture can greatly enhance the mechanical performance of the obtained copolymers compared with the telechelic analogues having nearly identical composition.…”

Mechanical Robust and Self‐Healable Supramolecular Hydrogel

“…As shown in Figure and Movie S4 of the Supporting Information, the hydrogel can recover to its original shape in 20 min. The mechanism of the water‐induced shape recovery is assumed as follows: when the dehydrated hydrogel is immersed in water, water molecules will diffuse into the hydrogel network and act as plasticizers, which will decrease the interactive forces among the tangled polymer chains, and induce the shape recovery process …”