One-pot fabrication of triple shape memory hydrogel based on coordination bond, the dynamic borate ester bonds, and hydrogen bond

Wang, Minying; Wang, Ling; Xu, Yuande; Fu, Lihua; Yang, Hua

doi:10.1080/1539445x.2019.1606012

Cited by 12 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A dual network is generally made of the same polymer cross-linked by two different types of bonds, often a covalent and a supramolecular bond, or two types of supramolecular bonds, ,− while IPNs comprise two or more interlaced polymer networks that are not covalently bonded to each other. The latter systems have gained broad interest because they allow a combination of the desired properties of each network (e.g., stimuli responsiveness), and even more, because they may exhibit new properties that are not observed in the component networks alone. − Most notably, IPN hydrogels may show enhanced mechanical properties such as greater toughness, larger extensibility, and improved strength due to synergistic interactions between the component networks that transfer the stress and dissipate mechanical energy upon deformation. ,, Recently, the combination of DCB and supramolecular interactions has been also reported to fabricate responsive IPN hydrogels and elastomers with outstanding mechanical performances. − For example, Konkolewicz et al synthesized a double dynamic IPN elastomer with superior mechanical (increased stress and strain at break, increased malleability, greater toughness) and self-healing properties based on Diels–Alder adduct and hydrogen bonding. Liang et al prepared highly stretchable IPN hydrogels with the properties of actuation, shape memory, and self-healing capability using boronic ester bonds and alginate–Ca 2+ complexation.…”

Section: Introductionmentioning

confidence: 99%

Tunable Interpenetrating Polymer Network Hydrogels Based on Dynamic Covalent Bonds and Metal–Ligand Bonds

et al. 2020

View full text Add to dashboard Cite

A series of tunable interpenetrating polymer network (IPN) hydrogels are designed by the orthogonal incorporation of two distinct types of reversible bonds, i.e., Schiff base bonds and metal−ligand coordination bonds. Two copolymers based on poly(N,N-dimethyl acrylamide) (PDMA) are synthesized and used as building blocks for the IPN hydrogels. The first one bears ketone pendant groups and is cross-linked by dihydrazide or bishydroxylamine compounds to form, respectively, acylhydrazone-or oxime-based dynamic covalent bond (DCB) networks. The second one bears terpyridine side groups and is cross-linked by the addition of two different transition-metal cations to obtain supramolecular networks based on metal−terpyridine bis-complexes. Several IPN hydrogels are prepared by combining these different types of reversible bonds to investigate how the two subnetworks influence each other. To this end, the influence of the cross-linker nature and of the hydrogel preparation protocol on the rheological properties of these IPNs are also studied in detail. In particular, we show that the obtained IPN hydrogels exhibit a higher modulus compared to the simple addition of the moduli of the single networks, which we attribute to the entanglements between the two networks. We then study how these IPN hydrogels can disentangle and partially relax if one of the reversible subnetworks is composed of cross-links with a shorter lifetime. Finally, pH is used as a stimulus to affect the dynamics of only one of the subnetworks, and the impact of this change on the properties of the IPNs is investigated.

show abstract

Section: Introductionmentioning

confidence: 99%

Tunable Interpenetrating Polymer Network Hydrogels Based on Dynamic Covalent Bonds and Metal–Ligand Bonds

et al. 2020

View full text Add to dashboard Cite

show abstract

“…At present, there are four main methods to prepare TSMP. The first is to blend two resins to make the polymer with a wide glass transition region. , Three-phase blending can also achieve a triple-shape memory effect. , Another way to obtain TSMP is copolymerization after blending resins to form heterogeneous cross-linking structures and broad glass transition regions. − The third one is the formation of dynamic covalent bonds in the resin, using the bond fracture and formation to achieve a triple-shape memory effect. − The last is to achieve a triple or quadruple SME through the structural design of multiple materials, such as bilayers, laminates, and segmented structures. − For amorphous SMP, two well-separated glass transition peaks are necessary for the polymers to have outstanding triple-shape memory behaviors. The TSMP prepared by the above methods has a broad glass transition region, and the two glass transition peaks do not separate or overlap in a large area.…”

Section: Introductionmentioning

confidence: 99%

4D Printing of Triple-Shape Memory Cyanate Composites Based on Interpenetrating Polymer Network Structures

Wang

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The triple-shape memory polymer (TSMP) can be programmed into two temporary shapes (S 1 and S 2 ) and shows an ordinal recovery from S 2 to S 1 and eventually to the permanent shape upon heating, which realizes more complex stimulus-response motions. We introduced a novel strategy for forming triple-shape memory cyanate ester (TSMCE) resins with high strength and fracture toughness via three-step curing, including four-dimensional (4D) printing, UV post-curing, and thermal curing. The obtained TSMCE resins presented two separated glass transition temperature (T g ) regions due to the formation of an interpenetrating polymer network (IPN), which successfully endowed the polymers with the triple-shape memory effect. The two T g increased with the increasing cyanate ester (CE) prepolymer content; their ranges were 82.7−102.1 °C and 164.4−229.0 °C, respectively. The fracture strain of the IPN CE resin was up to 10.9%. Moreover, the cooperation of short carbon fibers (CFs) and glass fibers (GFs) with the polymer-accelerated phase separation resulted in two well-separated T g peaks exhibiting better excellent triple-shape memory behaviors and fracture toughness. The strategy for combining the IPN structure and 4D printing provides insight into the preparation of shape memory polymers integrating high strength and toughness, multiple-shape memory effect, and multifunctionality.

show abstract

“…Shape memory polymers have the potential to remember their permanent shape due to thermal, electric, magnetic, moisture, light, and pH stimulation, and they stabilize in any temporary shape under a predetermined program [10,11]. The structure of shape memory polymers requires hard segments to maintain the permanent shape and soft ones to stabilize the temporary shape and restore the permanent one.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the hydrogel showed a shape memory behaviour with a recovery ratio of 100%. In addition, the produced hydrogel showed favourable mechanical properties such as tensile stress (0.075 MPa), tensile strain (260%) and compressive stress (2.75 MPa) [11]. In the SMP aerogels, Guo et al prepared graphene-SMP nanocomposite aerogel using the post-infiltration method of PCL macromonomer/toluene solution into a graphene aerogel framework.…”

Section: Introductionmentioning

confidence: 99%

Shape memory behaviour of polyvinyl alcohol aerogels cross-linked with Fe³⁺ & Cu²⁺ metallic ions

Mohsenian,

Kokabi,

Alamdarnejad

2023

Smart Mater. Struct.

View full text Add to dashboard Cite

The utter purpose of this study was to embed metal ions in polymer chains to improve the shape memory behaviour of polyvinyl alcohol (PVA) aerogels in which metal ions were used as cross-linking agents for PVA. PVA-Cu and PVA-Fe hydrogels were first prepared by adding different amounts of Cu (NO3)2.3H2O and Fe (NO3)3.9H2O salts, respectively, then aerogel samples were prepared by the freeze-drying of hydrogels. Fourier transform infrared (FTIR) test was employed to evaluate the chemical structure. Gravimetric and mercury porosimetry methods were performed to characterize the porosity of aerogels. Field emission scanning electron microscopy (FESEM) examined the microstructure of the network and the porosity of the aerogels. The shape memory behaviour of the nanocomposite aerogels was evaluated by dynamic-mechanical analysis (DMA). The test results showed that by adding 25 wt.% copper salt and 40 wt.% iron salt to the PVA, the maximum gel fractions were achieved. Compared to pure PVA, the recovery ratios of nanocomposite aerogels increased by about 80% and 140% and their moduli increased by more than 370% and 300%, respectively.

show abstract

One-pot fabrication of triple shape memory hydrogel based on coordination bond, the dynamic borate ester bonds, and hydrogen bond

Cited by 12 publications

References 34 publications

Tunable Interpenetrating Polymer Network Hydrogels Based on Dynamic Covalent Bonds and Metal–Ligand Bonds

Tunable Interpenetrating Polymer Network Hydrogels Based on Dynamic Covalent Bonds and Metal–Ligand Bonds

4D Printing of Triple-Shape Memory Cyanate Composites Based on Interpenetrating Polymer Network Structures

Shape memory behaviour of polyvinyl alcohol aerogels cross-linked with Fe³⁺ & Cu²⁺ metallic ions

Contact Info

Product

Resources

About

One-pot fabrication of triple shape memory hydrogel based on coordination bond, the dynamic borate ester bonds, and hydrogen bond

Cited by 12 publications

References 34 publications

Tunable Interpenetrating Polymer Network Hydrogels Based on Dynamic Covalent Bonds and Metal–Ligand Bonds

Tunable Interpenetrating Polymer Network Hydrogels Based on Dynamic Covalent Bonds and Metal–Ligand Bonds

4D Printing of Triple-Shape Memory Cyanate Composites Based on Interpenetrating Polymer Network Structures

Shape memory behaviour of polyvinyl alcohol aerogels cross-linked with Fe3+ & Cu2+ metallic ions

Contact Info

Product

Resources

About

Shape memory behaviour of polyvinyl alcohol aerogels cross-linked with Fe³⁺ & Cu²⁺ metallic ions