Semi‐IPNs with Moisture‐Triggered Shape Memory and Self‐Healing Properties

Jiang, Zhi‐Chao; Xiao, Yao‐Yu; Kang, Yang; Li, Bang‐Jing; Zhang, Sheng

doi:10.1002/marc.201700149

Cited by 41 publications

(23 citation statements)

References 43 publications

(67 reference statements)

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“…However, like boronic ester bonds, H‐bonds are susceptible to water molecules that extremely tend to form H‐bonds; namely, a high moisture sensitivity. This can lead to gradually reduced mechanical strength of H‐bonded polymers exposed to conditions of high humidity . Such a drawback, however, can also be used to serve as water‐sensitive triggers or switches for manipulating the self‐healing and mechanical strength of H‐bond‐cross‐linked polymeric materials .…”

Section: Discussionmentioning

confidence: 99%

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

2019

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to traditional metallic and ceramic materials. [1] Therefore, it has been desirable to create high-performance polymeric materials that are mechanically robust, thermostable, and even healable for meeting practical applications in industry. The creation of cross-linked polymers has been regarded as one promising approach for creating strong and thermally stable polymers. [3][4][5] Cross-linked polymers normally exhibit superior mechanical and thermostable performances to their uncrosslinked counterparts. [6][7][8][9][10] Traditionally, a chemically covalent approach has been the primary means for realizing the cross-linking of polymeric materials. As compared with the parent polymer, cross-linked polymers normally gain enhanced mechanical strength and thermal stability. [6][7][8][9][10][11] This strategy, however, gives rise to significantly reduced extensibility because of the exclusive molecular mechanism between strength, extensibility, and toughness. [12][13][14][15] By contrast, noncovalent cross-linking can lead to increased mechanical strength without sacrificing the extensibility and toughness of polymeric materials. Such cross-linking can be realized by adopting strong noncovalent interactions including Coulombic interactions, [11] dipoledipole interactions, [12] metal coordination, [13] and hydrogenbonding (H-bonding) interactions. [5,16] To date, H-bonding is among the most extensively employed noncovalent interactions for the creation of cross-linked polymeric materials with tunable microstructure and tailor-made performances because of its directionality, versatility, and reversibility. In 1997, Meijer and co-workers [17] pioneered the synthesis of the first reversible cross-linked polymer by reacting a trifunctional copolymer of hydroxyl-terminated poly(propylene oxide) with diisocyanate and then 2-ureido-4-pyrimidone (UPy) units capable of forming quadruple H-bonds. The final poly mer shows a relatively high plateau modulus because such H-bond cross-links can serve as entanglements in a linear polymer. Following the synthesis of some uncross-linked polymeric materials containing UPy motifs, [17][18][19] Meijer's group has further synthesized many cross-linked polymeric materials based on UPy motifs. [20][21][22] On the other hand, in many natural biological materials, such as silk [23][24][25][26] and muscle, [27] multiple H-bonding interactions have recently been revealed to play a critical part in realizing a unique combination of high strength, great It has always been critical to develop high-performance polymeric materials with exceptional mechanical strength and toughness, thermal stability, and even healable properties for meeting performance requirements in industry. Conventional chemical cross-linking leads to enhanced mechanical strength and thermostability at the expense of extensibility due to mutually exclusive mechanisms. Such major challenges have recently been addressed by using noncovalent cross-linking of reversible multiple hydrogen-bonds (H-bonds) that widely exist in biological...

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Section: Discussionmentioning

confidence: 99%

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

2019

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“…However, damage with high degree of deformation is hard to be healed since fracture surfaces cannot autonomously come together into need closure for healing. Addressing this problem, a new concept that uses shape memory effect to assist the self-healing process has been explored [46][47][48][49][50][51].…”

Section: Smps and Shps Based On Cd-guest Interactionsmentioning

confidence: 99%

Cyclodextrins-Based Shape Memory Polymers and Self-Healing Polymers

Zhang¹,

Zeng²,

2019

Handbook of Macrocyclic Supramolecular Assembly

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“…Its molecular structure is a kind of network usually composed of reversible phase and stationary phase. The stationary phase can be a cross-linked node by chemical reaction or physical reaction, and it plays an important role in building a cross-linking network [1,2]. The reversible phase is usually glassy-amorphous transformation, crystallization-melting transformation, etc., and the phase transition is also varied.…”

Section: Introductionmentioning

confidence: 99%

Swelling Resistance and Water-Induced Shape Memory Performances of Sisal Cellulose Nanofibers/Polyethylene Glycol/Citric Acid Nanocellulose Papers

Zhang

Song

et al. 2019

Journal of Nanomaterials

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In this work, a kind of nanocomposite paper was obtained by evaporation-induced self-assembly of a mixture of sisal cellulose nanofibers (CNF) and polyethylene glycol (PEG) as the matrix and citric acid (CA) as a cross-linking agent. The CNF/PEG/CA paper exhibited good water swelling resistance which could be controlled by changing the concentration of CA. In addition, this nanocomposite paper exhibited good mechanical properties and water-induced shape memory performance. In particular, when the dosage of CA was 30 wt.%, the tensile strength and the tensile modulus of the CNF/PEG/CA paper after swelling were 25.2 MPa and 813.0 MPa, respectively. Further, this nanocomposite showed great potential for water-induced shape memory materials with fast response speed. The shape recovery rate (Rr) of the CNF/PEG/CA paper reached 90.2% with 30 wt.% CA after being immersed in water for 11 s. It is anticipated that our current work can be used to exploit more efficient methods to overcome the poor water swelling resistance of the cellulose-based shape memory materials.

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Semi‐IPNs with Moisture‐Triggered Shape Memory and Self‐Healing Properties

Cited by 41 publications

References 43 publications

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

Cyclodextrins-Based Shape Memory Polymers and Self-Healing Polymers

Swelling Resistance and Water-Induced Shape Memory Performances of Sisal Cellulose Nanofibers/Polyethylene Glycol/Citric Acid Nanocellulose Papers

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