MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 44
·期 4
·2200705
·
IF 5.006
Guang-Lin Fan,Shu-Wei Wang,Ying-Ying Zhang,Zhao-Tie Liu,Zhong-Wen Liu,Lei Wang,Jin-Qiang Jiang,Guo Li
Hydrogel shape memory and actuating functionalities are heavily pursued and have found great potential in various application fields. However, their combination for more flexible and complicated morphing behaviors is still challenging. Herein, it is reported that by controlling the light-initiated polymerization of active hydrogel layers on shape memory hydrogel substrates, advanced morphing behaviors based on programmable hydrogel shapes and actuating trajectories are realized. The formation and photo-reduction-induced dissociation of Fe 3+ -carboxylate coordination endow the hydrogel substrates with the shape memory functionality. The photo-reduced Fe 2+ ions can diffuse from the substrates into the monomer solutions to initiate the polymerization of the thermally responsive active layers, whose actuating temperatures and amplitudes can be facially tuned by controlling their thicknesses and compositions. One potential application, a shape-programmable 3D hook that can lift an object with a specific shape, is also unveiled. The demonstrated strategy is extendable to other hydrogel systems to realize more versatile and complicated actuating behaviors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2017
·Vol. 9
·期 7
·287
·
IF 3.364
Jinghao Yang,Hao Wen,Haitao Zhuo,Shaojun Chen,Jianfeng Ban
In this paper, we developed a photo-thermo staged-responsive shape-memory polymer network which has a unique ability of being spontaneously photo-responsive deformable and thermo-responsive shape recovery. This new type of shape-memory polyurethane network (A-SMPUs) was successfully synthesized with 4,4-azodibenzoic acid (Azoa), hexamethylenediisocyanate (HDI) and polycaprolactone (PCL), followed by chemical cross-linking with glycerol (Gl). The structures, morphology, and shape-memory properties of A-SMPUs have been carefully investigated. The results demonstrate that the A-SMPUs form micro-phase separation structures consisting of a semi-crystallized PCL soft phase and an Azoa amorphous hard phase that could influence the crystallinity of PCL soft phases. The chemical cross-linking provided a stable network and good thermal stability to the A-SMPUs. All A-SMPUs exhibited good triple-shape-memory properties with higher than 97% shape fixity ratio and 95% shape recovery ratio. Additionally, the A-SMPUs with higher Azoa content exhibited interesting photo-thermo two-staged responsiveness. A pre-processed film with orientated Azoa structure exhibited spontaneous curling deformation upon exposing to ultraviolet (UV) light, and curling deformation is constant even under Vis light. Finally, the curling deformation can spontaneously recover to the original shape by applying a thermal stimulus. This work demonstrates new synergistically multi-responsive SMPUs that will have many applications in smart science and technology.Keywords:azobenzene;polyurethane;shape memory;photo;responsiveness
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 308
·期 4
·2200547
·
IF 4.402
Peng Fu,Jiahui Zhang,Yuancheng Zhang,Wei Zhao,Xiaomeng Zhang,Ge Shi,Yanjie He,Zhe Cui,Xinchang Pang,Minying Liu
Shape memory polyamide elastomers have attracted large attention owing to a variety of favorable properties (e.g., designable chemical structure, good thermal stability, flexibility, and elasticity, et al). However, the polyamide elastomer reported recently still lack good mechanical property. In the present work, a new type of shape memory thermoplastic polyamide elastomer (TPAE), composed of long carbon chain PA1212 and polytetramethylene ether glycol (PTMEG), is synthesized through two-step melt polycondensation, which is named as poly(ether- b -amide) (PEBA). The chemical structure of PEBA is confirmed by FTIR results and it also shows excellent mechanical properties. PEBA, possessing two melting temperatures, stay in microphase separation among PTMEG soft domains and PA1212 hard domains that are amorphous and α crystal, respectively. Furthermore, PEBA can fix a temporary shape after the heated strip is twisted and cooled down and then recover to the original shape after secondary heating, which is attributed to the fixing force provided by PTMEG domains and entropy elasticity of physically cross-linked PA1212 domains, respectively. Besides, PEBA elastomer can be reshaped between ≈190 and ≈380 °C and it also has shape memory behavior. This new kind of TPAE proposes a new smart material for sensors and soft robotics.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 38
·e202300969
·
IF 4.3
Huaqiang Ju,Qing Li Zhu,Min Zuo,Songmiao Liang,Miao Du,Qiang Zheng,Zi Liang Wu
Graphical Tough hydrogels were developed by forming robust hydrazide-Zn 2+ coordination complexes. The mechanical properties of the resultant gels exhibited a notable temperature dependence and thus a good shape-memory ability due to the dynamic nature of coordination bonds. The reactive amine group of the hydrazide enables facile surface modification and functionalization based on Schiff's base reactions. Energy dissipation based on dynamic fracture of metal ligands is an effective way to toughen hydrogels for specific applications in biomedical and engineering fields. Exploration of new kinds of metal-ligand coordinates with robust bonding strength is crucial for the facile synthesis of tough gels. Here a hydrogel toughening strategy based on the formation of robust coordination complexes between the hydrazide ligands and zinc ions is reported. The resultant hydrogels exhibit high strength and toughness at room temperature. Their mechanical properties show temperature dependence due to the dynamic nature of coordination bonds. In addition, the amine group of hydrazides in the gel matrix provides a reactive site for Schiff's base reaction, enabling surface modification without influence on overall mechanical performances of the gel. The hydrazide ligands are easy to synthesize and can coordinate very well with several transition metals. Such a metal-ligand coordination should be suitable to develop tough soft materials with versatile applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2018
·
IF 3.483
Haitao Zhuo,Zhankui Mei,Heng Chen,Shaojun Chen
In this contribution, shape memory polymers (SMPs) of chemically-crosslinked zwitterionic polyurethanes (CZPUs) were fabricated by crosslinking of the N,N-bis(2-hydroxyethyl) isonicotinamide (BINA)/hexamethylene diisocyanate (HDI) polyurethanes system by using pentaerythritol (PER), followed by zwitterionization with 1, 3-propanesultone (PS). As the zwitterionic units increased, it was found that the glass transition of hard phase in CZPUs remains constant while that of soft phase shifted at lower temperature, and a broad glass transition was obtained. The broad glass transition enables CZPUs to display triple, quadruple, and quintuple shape memory behaviours. Meanwhile, due to the chemically-crosslinked structure, the CZPUs exhibited an excellent shape fixation and recovery. Furthermore, the CZPU also exhibited good moisture-induced shape memory effect (SME) with a fast and high shape recovery observed below 70% RH and at 37 °C. The excellent thermally-induced multi-shape memory effect and moisture-induced shape memory effect enable CZPUs to be applied as smart materials for many applications among them the biomedical fields .
研究领域:
生物材料学
·
高分子科学
·
智能响应材料
·
组织工程
·
药物递送系统
·
再生医学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 14
·1973-1981
·
IF 8.683
Xi Xie,Xu Xu,Qixuan Zhu,Shaorong Lu,Yuqi Li,Yongkang Bai
Smart materials with reversible shape transformation have drawn enormous interest for their potential applications in various fields. Herein, we show a novel reversible shape change bilayer material based on a shape memory polymer layer and a passive silicone layer, which can exhibit excellent thermo- and near infrared (NIR) light-induced reversible multi-shape memory performance. The NIR light responsiveness of the material is achieved by the introduction of tannic acid/ferric ion coordination, while the multi-shape memory effect originated from the wide glass transition temperature of the shape memory polymer layer. Based on the shape recovery stress at elevated temperature and resilience force of the silicone layer during the cooling process, thermo- and NIR light-induced reversible multi-shape memory performance is realized. Moreover, the practicability of the bilayer material as a light-driven actuator and temperature sensor is also investigated, demonstrating its versatile application potential as an actuator and sensor.
研究领域:
材料科学
·
智能材料
·
执行器与传感器
·
聚合物科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ya Liu,Yaqi Ren,Jing Huang,Hongsheng Lu,Zhiyu Huang,Li Wang
Shape-memory gel materials are widely used in smart drives and biological tissues due to their excellent flexibility and diverse stimuli responsiveness. In particular, shape-memory organohydrogel materials have rose intense interest recently owing to their sophisticated shape memory behavior. However, conventional mechanical enhancement strategies, either by introducing nanoparticles or double-network structure, employed in the preparation of organohydrogels require high energy input, leading to difficulties in emulsification for emulsion precursors of organohydrogels. These strategies are not suitable for large-scale production of high-strength organohydrogels. Herein，a high-strength shape-memory organohydrogel NL-H was prepared based on dual hydrogen bonding and gelator-induced solidification effect. The precursor was easily emulsified, as the aqueous phase involved no nanoparticles or highly viscous polymers. Moreover, the dual hydrogen bonds among the dual amide groups of N -acryloyl glycinamide (NAGA) monomers can endow the organohydrogel with high mechanical properties . Owing to the oil-solidification effect of gelator HSA, the mechanical properties could be greatly enhanced, showing a high Young's modulus of 188.04 kPa. Furthermore, by integrating a high elastic hydrogel matrix and reversible oil domains, the organohydrogel showed a thermo-softening and favorable shape-memory properties. Consequently, this work provides a new enhancement strategy for the preparation of organohydrogel with high mechanical properties and excellent shape memory capabilities. And the simple preparation process can also facilitate the large-scale fabrication.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 7
·2326-2335
·
IF 6.641
Tianyu Yang,Mian Wang,Fei Jia,Xiuyan Ren,Guanghui Gao
Recently, hydrogel-based sensors have been rapidly developed due to their excellent flexibility, stretchability and toughness. However, it is still necessary to develop a hydrogel sensor with shape memory and remolding performance for multi-field applications. Here, a dual physically cross-linked shape memory hydrogel sensor was fabricated via blending poly vinyl alcohol (PVA), cationic chitosan and graphene oxide in water and glycerol. The introduction of cationic chitosan endows the hydrogels with excellent electrical conductivity. Therefore, the hydrogel can be integrated as a strain sensor to repeatedly monitor human motions. Meanwhile, the hydrogel can be used as a thermo-responsive shape memory sensor by virtue of orientation of PVA molecular chains under force and disorientation after heating. Besides, the hydrogel possesses anti-freezing properties with mechanical flexibility at −20 °C. Due to the dual physical cross-linking, the hydrogels can effectively dissipate energy and reconstruct the network; thus, the hydrogels gain excellent strength and remolding properties. In a word, this strategy provides a feasible method to prepare multifunctional shape memory hydrogels applied as wearable strain sensors and shape memory sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hexuan Wang,Yunrui Xie,Xintong Huo,Yaolin Hu,Yuqi Sheng,Peng Lv,Shuang Wang,Haina Qi,Wensheng Yu,Xiangting Dong
With the explosive growth of mass data and the increasing importance of information security, storage mediums are continuously explored to meet different anticounterfeiting and information storage encryption complex scenario applications. Here, Eu(TTA)3(TPPO)2 is combined with two polymer matrices of polycaprolactone (PCL) and thermoplastic polyurethane (TPU) to develop a shape-memory red fluorescent Eu(TTA)3(TPPO)2/PCL/TPU fibrous membrane with excellent mechanical strength and hydrophobicity using facile electrospinning. The Eu(TTA)3(TPPO)2 fibrous membrane can be utilized as an information storage medium; as a case study, invisible blue fluorescent printing ink easily purchased on the market is used as the “ink”, and the information patterns are printed on the membrane surface by using a customized mold such as QR codes. By utilizing shape-memory function and fluorescence characteristics of fibrous membranes, the original correct information can be readable only upon heating and illuminating by UV light, realizing information storage and dual-mode encryption. Meanwhile, a high integration of red-blue dual-color fluorescence and shape memory dual-mode anticounterfeiting with shape memory and fluorescence dual-mode encryption is achieved to realize concurrent information storage and dual-mode anticounterfeiting encryption. This work provides a low-cost, feasible, and effective strategy to develop high tensile strength, information storage, and multiple anticounterfeiting encryption materials with wide applications.
研究领域:
材料科学
·
光学
·
信息安全
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiaochun Liu,Zhiyi Huang,Jianxin Wu,Jianyu Wu,Hongsheng Luo,Yingjuan Sun,Xiaofeng Lin,Wenjing Lin,Guobin Yi
In light of the depletion of petrochemical resources and increase in environmental pollution, there has been a significant focus on utilizing natural biomass, specifically lignin, to develop sustainable and functional materials . This research presents the development of a lignin-based polyurethane (DLPU) with photothermal-responsiveness by incorporating lignin and oxime-carbamate bonds into polyurethane network. The abundant hydrogen bonds between lignin and the polyurethane matrix, along with its cross-linked structure, contribute to DLPU's excellent mechanical strength (30.2 MPa) and toughness (118.7 MJ·m −3 ). Moreover, the excellent photothermal conversion ability of DLPU (54.4 %) activates dynamic reversible behavior of oxime-carbamate bonds and hydrogen bonds, thereby endowing DLPU with exceptional self-healing performance. After 15 min of near-infrared irradiation, DLPU achieves self-healing efficiencies of 96.0 % for tensile strength and 96.3 % for elongation at break. Additionally, DLPU exhibits photocontrolled solid-state plasticity as well as an excellent phototriggered shape-memory effect (70 s), with shape fixity and recovery ratios reaching 98.8 % and 95.3 %, respectively. By exploiting the spatial controllability and photothermal-responsiveness of DLPU, we demonstrate multi-dimensional responsive materials with self-healing and shape-shifting properties. This work not only promotes the development of multi-functional polyurethanes but also provides a pathway for the high-value utilization of lignin.
研究领域:
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hanqiang Zhang,Peiren Wang,Heng Zhang,Gangsheng Chen,Kai Wang,Xiaoyi Chen,Zhen Chen,Mingxing Jiang,Junhui Yang,Min Chen,Ji Li
Mechanically robust and electrically conductive hydrogels hold significant promise for flexible device applications. However, conventional fabrication methods such as casting or injection molding meet challenges in delivering hydrogel objects with complex geometric structures and multicustomized functionalities. Herein, a 3D printable hydrogel with excellent mechanical properties and electrical conductivity is implemented via a facile one-step preparation strategy. With vat polymerization 3D printing technology, the hydrogel can be solidified based on a hybrid double-network mechanism involving in situ chemical and physical dual cross-linking. The hydrogel consists of two chemical networks including covalently cross-linked poly(acrylamide-co-acrylic acid) and chitosan, and zirconium ions are induced to form physically cross-linked metal-coordination bonds across both chemical networks. The 3D-printed hydrogel exhibits multiple excellent functionalities including enhanced mechanical properties (680% stretchability, 15.1 MJ/m3 toughness, and 7.30 MPa tensile strength), rapid printing speed (0.7–3 s/100 μm), high transparency (91%), favorable ionic conductivity (0.75 S/m), large strain gauge factor (≥7), and fast solvent transfer induced phase separation (in ∼3 s), which enable the development of high-performance flexible wearable sensors, shape memory actuators, and soft pneumatic robotics. The 3D printable multifunctional hydrogel provides a novel path for customizing next-generation intelligent soft devices.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·3297-3308
·
IF 3.665
Lin Xia,Qi Wang,Jiafeng Meng,Zhenguo Ma,Ping Zhao
A series of thermal and electro double-stimulus shape memory composites were processed using natural Eucommia ulmoides gum (EUG) and carbon nanotubes (CNTs). Mechanical, cure, and thermal properties were studied by universal testing machine, differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA), respectively. The shape memory behavior of the composites was explored via heat and electrical stimulation. The cross-linked network in the composites acted as a fixed domain, and the crystalline regions acted as a reversible domain during shape memory process. We studied the shape memory behavior of composites at different voltage and monitored the temperature change of composites during the process of electro-induced deformation memory in real time. Experimental results showed that appropriate amount of carbon nanotubes could not only improve the strength of composites but also provide electrical shape memory properties to composites. So, it is underscored that these kinds of shape memory composites exhibit excellent electro-responsive properties and have the potential to be used for intelligent and multiresponse shape memory applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）