Mechanically robust enzymatically degradable shape memory polyurethane urea with a rapid recovery response induced by NIR

Li, Xin; Liu, Wenkai; Li, Yaomin; Lan, Wanling; Zhao, Daiguo; Wu, Hecheng; Feng, Yuan Ping; He, Xueling; Li, Zhen; Li, Jiehua; Luo, Feng; Tan, Hong

doi:10.1039/d0tb00798f

Cited by 25 publications

(27 citation statements)

References 58 publications

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“…The premise of preparing body temperature response SMPs is to adjust T m to 37 °C. [4] It is known from the above discussion that T m of EUG decreases with the increase of epoxy content. Therefore, a series of ESHs was prepared by changing the amount of H 2 O 2 (controlling the epoxy content), and their crystallization behavior was characterized by DSC.…”

Section: The Crystallization Thermal Hydrophilicity and Mechanical Properties Of Eshsmentioning

confidence: 81%

“…[19][20][21] Temperature is the most important stimuli way for SMPs, because it is easy to design and execute. [4] Typically, the transition temperature (T trans ) at which the material returns to its permanent shape is usually consistent with the glass transition temperature or melting temperature. [22] Temporary shape fixation is achieved by glass transformation or crystallization when cooling the sample below T trans , and permanent shape is recovered driven by entropy elasticity when reheating the sample back to T trans .…”

Section: Introductionmentioning

confidence: 99%

“…Shape memory polymers (SMPs) are a kind of smart materials that can be programmed to temporary shapes and subsequently recover their permanent shapes in response to external stimuli, [1] including temperature, [2,3] light, [4] microwaves, [5] electricity, [6] water, [7] pressure, [8] ultrasound, [9] and so on. SMPs include both fixed phase and reversible phase.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bio‐Based, Self‐CrosslinkableEucommia ulmoidesGum/Silica Hybrids with Body Temperature Triggering Shape Memory Capability

Jia

et al. 2021

Macro Materials & Eng

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At present, the synthesis of body temperature triggering shape memory polymers usually requires elaborate structural design, which limits their wide application. Herein, starting from bio-based Eucommia ulmoides gum (EUG), a series of EUG/silica hybrids (ESHs) are prepared through a facile one-pot process, in which EUG is epoxied and then self-crosslinked with SiO 2 by epoxy ring-open reaction. Varying the amount of H 2 O 2 , the shape memory transition temperature (T trans ) of ESHs is adjusted to 47.4-36.6 °C, which is close to human body temperature (37 °C). Among them, ESH-17 exhibited the best body temperature triggering shape memory ability (T trans = 36.6 °C), which can restore the permanent shape within 60 s at 37 °C with a shape fixity ratio of 99% and shape recovery ratio near 100%. In addition, the shape memory mechanism is discussed and shows some application scenarios of ESHs. The as-produced materials can be used as smart biomaterials such as self-tightening sutures, self-sealing root canal filling materials, and so on.

show abstract

Section: The Crystallization Thermal Hydrophilicity and Mechanical Properties Of Eshsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bio‐Based, Self‐CrosslinkableEucommia ulmoidesGum/Silica Hybrids with Body Temperature Triggering Shape Memory Capability

Jia

et al. 2021

Macro Materials & Eng

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“…As reported in previous work, the shape memory behaviors based on the shape fixity ratio (R f ) and shape recovery ratio (R rec ) can be tested by DMA under the controlled force mode. 52,53 In this work, the effect of MW, permanent HMDI, and dynamic UPy crosslinking on the shape memory behaviors of LCNs was demonstrated based on DMA characterization. As shown in Figure 6a, LCN films were stretched to a certain strain to form a temporary shape under an applied load after they were first heated to 60 °C and kept for 3 min.…”

Section: ■ Introductionmentioning

confidence: 97%

Well-Tailored Dynamic Liquid Crystal Networks with Anionically Polymerized Styrene-Butadiene Rubbers toward Modulating Shape Memory and Self-Healing Capacity

Lei

Han

et al. 2021

Macromolecules

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Well-tailored construction of liquid crystal networks (LCNs) with simultaneous molecular mobility and mechanical enhancement is desirable. Since the properties of polymeric materials are largely a result of the molecular compositions of polymer chains, in the present work, we demonstrate the tuning compositional synthesis of anionically polymerized random styrene-butadiene rubbers (r-SBRs) with well-controlled 75 wt % butadiene (Bd) contents that offer molecular mobility. Microstructural 1,2-olefins of 51.5−64.0 mol % were designed to attach 50 mol % SiH-terminated mesogenic moieties (M) along Bd units using hydrosilylation. As mechanical strength usually conflicts with high molecular mobility, an integrated design derived from the orderly LC stacking and simultaneous crosslinking in various ratios of the dynamic 2(6-isocyanatohexylaminocarbonylamino)-6methyl-4[1H]-pyrimidinone (UPy-NCO) and permanent hexamethylene diisocyanate (HMDI) along 1,4-olefins of Bd units offers necessary mechanical strength and molecular mobility, resulting in a series of dynamic LCNs (r-SBR-g-[M•HMDI•UPy]). LC textures, phase transitions, self-healing/welding, and shape memory capacities were comprehensively studied. All LCNs showed LC textures in POM around T i (42−53 °C), which definitely contributed to both mechanical performance and molecular mobility due to the 50 mol % orderly LC stacking. Ureidopyrimidinone (UPy) that forms a dynamic H-bond is beneficial for the temporary shape fixity ratio (R f ), recyclability, and self-healing/welding ability while decreasing the shape recovery ratio (R rec ) because UPy can increase breaking elongations but sacrifice the mechanical strength. However, HMDI that forms a covalent crosslink showed the contrary effect, as HMDI can effectively enhance the mechanical strength but reduce the chain mobility. It is evidenced that r-SBR45k-g-[M-0%, 2%] can hardly undergo shape recovery (R rec = 0) despite R f = 92.6%, while with regard to r-SBR45k-g-[M-10%, 2%], R rec greatly increased to 100%, but R f decreased to 46.2%. All LCNs showed a higher than 82% self-healing/welding efficiency, with an exception of r-SBR-g-[M-10%, 2%]. This indicated the cooperative effect of molecular compositions on the properties. The well-tailored construction of polymer chain architecture through quantitative synthesis proves to be a powerful strategy for manipulating properties.

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“…The shape-memory polymers (SMPs) have the advantages of low density, excellent shape-recovery capacity, electrical insulation, easy processability, and low cost. [1][2][3][4][5] Thus, SMPs are widely used in electronics, aircraft, and aerospace fields, such as in actuators and self-deployable space structures. [6][7][8][9][10] An SMP shifts between rigid and elastic states through thermal stimuli at the critical temperature (T c ).…”

Section: Introductionmentioning

confidence: 99%

Deployment Analysis of Aramid Fiber Reinforced Shape-Memory Epoxy Resin Composites

Jing¹,

Wei²,

Liu³

et al. 2020

Eng. Sci.

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This work aims to study the shape recovery of aramid fiber-reinforced shape-memory epoxy resin composite (SMERs). A circular tube can be assumed to be composed of a pair of curved tape with the same radius before being folded, and the middle position of this tubular structures is folded with a small curvature. The cylindrical shell is deformed into a flat shape at the folding line. So the shape memory fold-deploy experiments of the three deployable structures, flat tape, curved tape, and circular tube prepared with SMERs, were performed respectively, and the shape memory deployable processes were also simulated with finite element model. The temperature dependences of deployment angle, axial stress and axial strain in the shape memory folding step, cooling step, constraint removal step and reheating step were analyzed. The results showed that the full deployable process of each deployable structure was simulated well compared with experimental results. The strength failure in structure component occurred during the fold-deploy shape memory process. The long-term shear modulus of viscoelastic materials had a great influence on shape memory performance.

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Mechanically robust enzymatically degradable shape memory polyurethane urea with a rapid recovery response induced by NIR

Abstract: NIR-light triggered shape memory process involving PU/gold-nanorod composites is shown.

Cited by 25 publications

References 58 publications

Bio‐Based, Self‐CrosslinkableEucommia ulmoidesGum/Silica Hybrids with Body Temperature Triggering Shape Memory Capability

Bio‐Based, Self‐CrosslinkableEucommia ulmoidesGum/Silica Hybrids with Body Temperature Triggering Shape Memory Capability

Well-Tailored Dynamic Liquid Crystal Networks with Anionically Polymerized Styrene-Butadiene Rubbers toward Modulating Shape Memory and Self-Healing Capacity

Deployment Analysis of Aramid Fiber Reinforced Shape-Memory Epoxy Resin Composites

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