NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·103-110
·
IF 3.201
Funian Mo,Jianfeng Ban,Lulu Pan,Bo Shi,Shaorong Lu
In this study, a novel series of supramolecular liquid crystalline (LC) polyurethane composites, named SMPU–#HOBA (# represents the molar ratio of HOBA/BINA), were successfully prepared by incorporating hexadecyloxybenzoic acid (HOBA) into pyridine-containing polyurethane (PU). The effect of HOBA on the structure, morphology, and properties has been carefully investigated. The results demonstrate that the obtained SMPU–#HOBA composites not only maintained the LC property of the HOBA mesogen, but also enhanced the intrinsic crystallization of the soft segment phase. Thus, the composites showed an excellent multi-shape memory property with two crystalline temperatures. Moreover, self-gripping was demonstrated revealing reversible bidirectional shape memory by virtue of molecular flipping and movement of the hard segment domain. These composites display a rare combination of LC properties, multi-shape memory properties, and reversible bidirectional shape memory properties, which makes them ideal for many potential applications in smart temperature sensitive devices.
研究领域:
高分子科学
·
材料科学
·
智能材料
·
软物质物理
·
功能高分子
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2017
·Vol. 29
·期 2
·982-988
·
IF 1.907
Jiayu Xian,Jieting Geng,Yan Wang,Lin Xia
Shape-memory polymers are important smart materials with potential applications in smart textiles, medical devices, and sensors. We prepared trans-1,4-polyisoprene, low-density polyethylene (LDPE), and high-density polyethylene (HDPE) shape-memory composites using a simple mechanical blend method. The mechanical, thermal, and shape-memory properties of the composites were studied. Our results showed that the shape-memory composites could memorize 3 temporary shapes, as revealed by the presence of broad melting transition peaks in the differential scanning calorimetry curves. In the trans-1,4-polyisoprene/LDPE/HDPE composites, the cross-linked network and the crystallization of the LDPE and HDPE portions can serve as fixed domains, and all crystallizations can act as reversible domains. We proposed a schematic diagram to explain the vital role of the cross-linked network and the crystallization in the shape-memory process.
研究领域:
高分子材料科学
·
生物医学工程
·
智能材料
·
功能高分子
·
热响应材料
✓ 已验证
DOI
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
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiaxin Wu,Wenfei Ai,Kai Hou,Chaofan Zhang,Yue Long,Kai Song
Many organisms rely on a dynamic attachment mechanism to climb surfaces. Inspired by these organisms, researchers have developed soft climbing robots. Despite their rapid development in recent times, such robots have restricted application in complex environments, such as the lack of remote wireless actuation and attachment ability for climbing tilted or slippery surfaces. To address these issues, we report a light-driven dynamic adsorption/desorption soft suction cup inspired by rock-climbing fish ( Beaufortia kweichowensis ). Our suction cups utilize the volumetric change caused by changes in the gas–liquid phase in the inner chamber to generate suction and thrust. The repetitive changes in the gas–liquid phase, controlled by photothermal conversion, help achieve adsorption and desorption. We demonstrated that the suction cups based on negative pressure adsorption can easily help miniaturize soft robotic devices and adapt to multiple types of substrates, making our approach applicable to tilted or slippery surfaces. By integrating the soft suction cups for surface attachment by dynamic control and a shape memory alloy as a deformable body, we developed a soft climbing robot that can perform precise, facile, and programmed controlled climbing under different conditions via remote light manipulation. Four continuous and directional climbing sequences on tilted and slippery surfaces were demonstrated. The results are expected to help advance the application of light-driven soft robots on tilted or slippery surfaces
研究领域:
机器人学
·
仿生工程
·
智能材料
·
微纳系统
·
生物医学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 7
·3111-3118
·
IF 3.069
Lulu Pan,Jianfeng Ban,Li Ren,Zuocai Zhang,Qingyuan Peng,Shaorong Lu
This paper aims at elucidating the influence of liquid crystals (LCs) on the properties of shape memory polymers. A novel series of liquid crystalline shape memory polyurethanes, named LC-SF-SMPUs were successfully prepared by chemically cross-linking polyester sisal fibre cellulose (PSF) with polycaprolactone (PCL) and 4,4′-di(6-hydroxyhexyloxy)biphenyl (BP6). The effect of BP6 on the morphology and properties has been carefully investigated. The results show that the cross-linking structures provided a stable network, high elasticity and good thermal stability to the LC-SF-SMPUs, and demonstrate that the obtained LC-SF-SMPUs not only maintained the LC property of BP6, but also enhanced the intrinsic crystallization of PCL. Thus, the LC-SF-SMPUs showed excellent multi-shape memory properties with two crystalline transition temperatures. In the triple-shape memory effect of LC-SF-SMPUs, the first step of strain recovery is associated with the melting transition of the soft segment crystals of the polyurethane matrix, and the second step of strain recovery results from the melting transition of the LC mesogen. The strain fixity improved with increasing BP6-content, due to the enhanced crystallinity. However, the total strain recovery decreased as a result of the lubrication of the BP6 chains. This work demonstrates a new combination of LC properties and multi-shape memory properties, which makes it ideal for many potential applications in new smart devices.
研究领域:
高分子材料
·
智能材料
·
功能高分子
·
形状记忆聚合物
·
生物基材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 82
·67247-67257
·
IF 3.84
Huilong Guo,Yinwen Li,Jian Zheng,Jianqun Gan,Liyan Liang,Kun Wu,Mangeng Lu
In this work, a novel epoxy monomer denoted as 3,5′-di-t-butyl-5,3′-dimethyl biphenyl diglycidyl ether (t-BuMBPDGE) was synthesized and applied into in situ composites with 3,3′,5,5′-tetramethyl-4,4′-biphenyl diglycidyl ether (TMBPDGE), accompanied with curing agent aromatic amines. The liquid crystalline phase structure and the crosslink density of substituted biphenyl epoxies were determined by polarized optical microscopy, wide angle X-ray diffraction measurements and dynamic storage moduli data. The samples showed good mechanical properties and could recover quickly from a second state to their initial states with a shape fixity ratio higher than 98% and shape recovery ratio higher than 99%, owing to the oriented structure and increased crosslink network density caused by the orientation of biphenyl mesogenic. The high glass transition temperatures ranging from 160 to 178 °C and good water resistance could contribute to a stable fixed shape. The water resistance is analyzed by contact angles test. The samples exhibited contact angles of 92–98 degrees, which indicated that the water resistance was apparently better than that of conventional epoxy systems.
研究领域:
高分子材料
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功能材料
·
化学工程
·
材料科学
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纳米复合材料
·
智能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Ziqi Zhu,Pei Yang,Minzhi Chen,Tao Zhang,Yizhong Cao,Wei Zhang,Xiaoyan Zhou,Weimin Chen
Carbon dots (CDs) have sparked tremendous attention owing to their unique properties and great potential in various fields. Herein, novel amphiphilic CDs (ACDs) were synthesized solvothermally by microwave heating a mixture of xylose and ethylenediamine in N, N-dimethylacetamide. The xylose-derived ACDs were monodisperse nanoparticles with an average diameter of about 1.81 nm, and exhibited excitation-dependent emission behavior in both aqueous and several common organic solvents . Furthermore, the synthesized ACDs can be uniformly dispersed into polyvinyl alcohol (PVA) solution to fabricate transparent luminescent composites, the as-prepared PVA/ACDs composites not only exhibited excellent fluorescence with excitation-dependent emission performance, but also achieved water-induced shape memory behavior. The intrinsic reason and pH sensitivity of shape recovery were investigated, the results confirmed that a faster shape recovery can be obtained in water at pH 4 within 180 s. Further investigation illustrated that the sensitivity of additional hydrogen bonding between PVA and ACDs to the water molecular was highly related to the shape recovery of the luminescent composite. The green synthesis route for xylan-derived ACDs and fabrication of smart luminescent composite will open many possibilities for the valuable application of low-cost biomass.
研究领域:
纳米材料学
·
高分子科学
·
生物医学工程
·
功能材料
·
绿色化学
·
智能材料
✓ 已验证
DOI
高影响因子
Defence Technology
·
2023
·
IF 5.1
Weitao Yang,Yuchen Gao,Rui Hu,Manman Li,Fengqi Zhao,He Jiang,Xuan Zhang
Smart materials, which exhibit shape memory behavior in response to external stimuli, have shown great potential for use in biomedical applications. In this study, an energetic composite was fabricated using a UV-assisted DIW 3D printing technique and a shape memory material (SMP) as the binder. This composite has the ability to reduce the impact of external factors and adjust gun propellant combustion behavior. The composition and 3D printing process were delineated, while the internal structure and shape memory performance of the composite material were studied. The energetic SMP composite exhibits an angle of reversal of 18 s at 70°, with a maximum elongation typically reaching up to 280% of the original length and a recovery length of approximately 105% during ten cycles. Additionally, thermal decomposition and combustion behavior were also demonstrated for the energetic SMP composite.
研究领域:
材料科学
·
高分子化学
·
推进剂技术
·
智能响应材料
·
增材制造
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 26
·10169-10181
·
IF 0
Shaojun Chen,Hongming Yuan,Shiguo Chen,Haipeng Yang,Zaochuan Ge,Haitao Zhuo,Jianhong Liu
Supramolecular liquid crystalline polymers and shape memory polymers are attracting increasing interest as materials. In this paper, we describe the development of a supramolecular liquid crystalline shape memory polyurethane (SLCSMPU) complex that exhibits both liquid crystalline properties and shape memory properties. The complex is formed by incorporating 4-hexadecyloxybenzoic acid (HOBA) into a pyridine-containing shape memory polyurethane (PySMPU). The HOBA is tethered to the PySMPU by strong hydrogen bonding between the pyridine rings and the COOH of the HOBA, forming a SLCSMPU complex. Heat treatment plays an important role in the formation of hydrogen-bonded supramolecular liquid crystalline structures in these SLCSMPU complexes. Thus, the SLCSMPU complex not only maintains the intrinsic liquid-crystalline properties of HOBA, but can also form a stable polymeric film for various shape memory applications. Additionally, the SLCSMPU complex forms a two-phase separated structure composed of an amorphous polyurethane matrix and a HOBA crystalline phase, which includes the hydrogen-bonded crystalline HOBA phase and the free HOBA crystalline phase. Therefore, a simple one-step programming process is developed that produces SLCSMPU complexes with excited triple-shape functionalities due to their multiple phase transitions, especially when the molar ratio of HOBA/BINA is less than 0.8.
研究领域:
高分子科学
·
材料化学
·
软物质物理
·
智能材料
·
功能高分子
✓ 已验证
DOI
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2017
·Vol. 28
·期 11
·1464-1472
·
IF 1.907
Zhankui Mei,Huanhuan Ren,Shaojun Chen,Zaochuan Ge,Jinlian Hu
This study develops a new type of moisture-sensitive shape memory polymer based on zwitterionic copolymers synthesized with acrylic acid (AA) and 3-Dimethyl (methacryloyloxyethyl) ammonium propane sulfonate (DMAPS). The moisture absorption properties of zwitterionic copolymers are particularly investigated in this paper. The results demonstrate that the DMAPS/AA copolymers possess a sulfobetaine structure and form a two-phase separation structure. The zwitterionic copolymers show both good hydrophilic properties and moisture absorption properties. Both AA and DMAPS segments influence the hydrophilic properties and moisture absorption of the composite copolymer. The moisture absorption process is well modeled by Fick's second law in its initial stage. The moisture absorption is mainly determined by immersion conditions and the given materials' structure. Moisture absorption speed and saturated moisture absorption both increase with an increase in DMAPS content as well as the immersion temperature. The increased moisture absorption rate and higher saturated moisture absorption results from the higher activation energy of diffusion. The DMAPS/AA copolymers demonstrate adequate moisture-sensitive shape memory effects. Stain recovery is faster in the zwitterionic copolymers containing higher DMAPS content, whereas the final shape recovery decreases with an increase of DMAPS content. Finally, it is proposed that not only good moisture absorption units are required but also physical crosslinks should be improved for moisture-sensitive shape memory polymers. Copyright © 2017 John Wiley & Sons, Ltd.
研究领域:
高分子材料科学
·
功能高分子
·
智能响应材料
·
生物医用材料
·
软物质物理
·
环境响应材料
✓ 已验证
DOI
高影响因子
Advanced Science
·
2020
·Vol. 7
·期 21
·1902740
·
IF 15.84
Mohammad Ali Darabi,Ali Khosrozadeh,Ying Wang,Nureddin Ashammakhi,Halima Alem,Ahmet Erdem,Qiang Chang,Kaige Xu,Yuqing Liu,Gaoxing Luo,Ali Khademhosseini,Malcolm Xing
Strong, stretchable, and durable biomaterials with shape memory properties can be useful in different biomedical devices, tissue engineering, and soft robotics. However, it is challenging to combine these features. Semi-crystalline polyvinyl alcohol (PVA) has been used to make hydrogels by conventional methods such as freeze–thaw and chemical crosslinking, but it is formidable to produce strong materials with adjustable properties. Herein, a method to induce crystallinity and produce physically crosslinked PVA hydrogels via applying high-concentration sodium hydroxide into dense PVA polymer is introduced. Such a strategy enables the production of physically crosslinked PVA biomaterial with high mechanical properties, low water content, resistance to injury, and shape memory properties. It is also found that the developed PVA hydrogel can recover 90% of plastic deformation due to extension upon supplying water, providing a strong contraction force sufficiently to lift objects 1100 times more than their weight. Cytocompatibility, antifouling property, hemocompatibility, and biocompatibility are also demonstrated in vitro and in vivo. The fabrication methods of PVA-based catheters, injectable electronics, and microfluidic devices are demonstrated. This gelation approach enables both layer-by-layer and 3D printing fabrications.
研究领域:
生物材料学
·
组织工程
·
软体机器人
·
再生医学
·
生物医学工程
·
高分子科学
·
转化医学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2017
·Vol. 303
·期 2
·1700396
·
IF 2.863
Zhihui Qin,Rui Niu,Chenjue Tang,Jun Xia,Feng Ji,Dianyu Dong,Haitao Zhang,Shuo Zhang,Junjie Li,Fanglian Yao
A novel type of physical hydrogel based on dual-crosslinked strategy is successfully synthesized by micellar copolymerization of stearyl methacrylate, acrylamide, and acrylic acid, and subsequent introduction of Fe 3+ . Strong hydrophobic associations among poly(stearyl methacrylate) blocks form the first crosslinking point and ionic coordination bonds between carboxyl groups and Fe 3+ serve as the second crosslinking point. The mechanical properties of the hydrogel can be tuned in a wide range by controlling the densities of two crosslinks. The optimal hydrogel shows excellent mechanical properties (tensile strength of ≈6.8 MPa, elastic modulus of ≈8.0 MPa, elongation of ≈1000%, toughness of 53 MJ m −3 ) and good self-recovery property. Furthermore, owing to stimuli responsiveness of physical interaction, this hydrogel also shows a triple shape memory effect. The combination of two different physical interactions in a single network provides a general strategy for designing of high-strength hydrogels with functionalities.
研究领域:
高分子材料科学
·
生物医用材料
·
组织工程
·
智能响应材料
·
软物质物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）