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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Xiaoming Qi,Yu Liu,Hongbo Dai,Yaofeng Zhu,Yubing Dong,Shao-Yun Fu,Qingqing Ni,Yaqin Fu
Soft and flexible mechanical actuators capable of demonstrating large deformations and outputting stress spontaneously in responding to external environmental stimuli have been becoming a research focal point in the field of smart biomimetic systems and devices. Here, a novel twisted yarn actuator consisting of shape memory zinc dimethacrylate/ethylene vinyl acetate (ZDMA/EVA) composite fibers has been created following a four-step fabrication protocol including two-roll milling, melt-spinning, ultraviolet crosslinking, and twisting procedures. The obtained ZDMA/EVA composite fibers demonstrate excellent thermomechanical coupling effect and superior thermal/mechanical stability. In specific, the twisted yarn actuators present strong two-way shape memory capability (up to 8% reversible tensile stroke) and outstanding recovery stress (1.63–1.82 MPa). Notably, this composite yarn actuator (in diameters of 438–719 μm) is able to afford tension loads about 2300 times heavier than its own weight, reaching 7.76% reversible strain and exhibiting an exceptional energy density of 210 J/kg that is 26 times higher than the typical skeletal muscles. In addition, the optimal yarn actuator displays an ultimate rotation speed and rotational energy density of 15456 rpm/m and 5439 J/kg, respectively. This experimental study presents a facile, low-cost, and environmental-friendly manufacturing approach of developing high performance composite fiber-based yarn actuators.
研究领域:
智能材料
·
仿生系统
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 37
·5773-5782
·
IF 5.687
Shaojun Chen,Zhankui Mei,Huanhuan Ren,Haitao Zhuo,Jianhong Liu,Zaochuan Ge
This paper reports a new type of zwitterionic polyurethane containing pyridine type zwitterionic segments for shape memory materials. The pyridine type zwitterionic shape memory polyurethanes (SMPUs) were synthesized using polyurethane polymerization from N,N-bis(2-hydroxylethethyl)isonicotinamide (BINA), hexamethylene diisocyanate (HDI), diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BDO), followed by a ring-opening reaction with 1,3-propanesultone (PS). The structure and properties of the pyridine-type zwitterionic SMPUs (PyZPUs) were investigated systematically. The results demonstrate that the PyZPUs form phase-separation structures composed of a hard phase and an amorphous soft phase with a broad glass transition. The shape memory tests show that the PyZPUs have thermal-induced dual-shape memory effects (SMEs), triple-SMEs and quadruple-SMEs and also moisture-sensitive SMEs. Comparatively, the samples with PS/BINA molar ratios of 0.6–0.8 have more than 86% shape recovery and more than 95% shape fixity with a heat stimulus. Under moisture conditions, these samples also show the quickest moisture-sensitive strain recovery, up to 86%. Moreover, the PyZPUs show good biocompatibility when the content of pyridine type zwitterionic segments is beyond 21 wt%. Thus, the PyZPUs are expected to have many promising applications in smart 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
·
转化医学
·
药物递送系统
·
表面功能化
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 22
·10229-10244
·
IF 2.302
Ban Jianfeng,Zhu Linjiang,Chen Shaojun,Wang Yiping
Aiming to elucidate the influence of liquid crystal fillers on the structure and properties of liquid-crystalline (LC) shape-memory polyurethane (SMPU) composites, a series of LC-SMPU composites are successfully prepared by adding various concentrations of 4-dodecyloxybenzoic acid (DOBA) to shape-memory polyurethane containing 40 wt% hard segment content (SMPU40). The structure, morphology, thermal properties, liquid crystalline properties, and shape memory properties are systematically investigated. The results demonstrate that DOBA is successfully incorporated into the polymer matrix of SMPU40 without interrupting the dimerization structure of DOBA that allows it to exhibit LC properties. The incorporated DOBA not only improves the crystallizability of the soft segment but also promotes the crystallizability of the hard segment. The isothermal crystallization kinetics further reveal that the crystallization rate of the hard segment decreases as the DOBA content increases, and the crystallization of the LC-SMPU composites nucleates in a similar manner. The LC-SMPU composites are composed of a DOBA phase and an SMPU phase, which further forms soft phase–hard phase microphase separation structures. The composite tends to only maintain the nematic LC properties of DOBA due to the interruption of polyurethane chains. However, the LC-SMPU composites exhibit good triple-shape memory effects. The first step of strain recovery is associated with the melting transition of soft segment crystals of the polyurethane matrix, and the second step of strain recovery is resulted from the melting transition of the DOBA crystals.
研究领域:
高分子材料科学
·
功能高分子
·
智能材料
·
软物质物理
·
材料化学
·
热分析
·
相变材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2628-2641
·
IF 2.302
Ban Jianfeng,Zhu Linjiang,Chen Shaojun,Wang Yiping
In order to better understand the interrelation between liquid crystal fillers and functional polymers, a series of liquid crystalline shape memory polyurethane composites (LC-SMPUCs), named shape memory polyurethane (SMPU)–4-hexadecyloxybenzoic acid (HOBA) composites, are prepared by incorporating HOBA into SMPU based on a polyethylene glycol (PEG) soft segment. The results demonstrate that the dimerization structure of HOBA is maintained in the as-prepared SMPU–HOBA composites, facilitating liquid crystalline properties. Characterization results display smectic C phase upon heating, while the isotropic temperature shifts to a higher temperature, broadening the temperature range of the liquid crystalline phase. The SMPU–HOBA composites form a two-phase separated structure containing a SMPU phase and a HOBA phase; the incorporated HOBA can promote crystallizability of both soft and hard segments of SMPU, while crystalline hard phases are maintained within the high temperature range. Thus, SMPU–HOBA composites demonstrate a two-step modulus change upon heating that releases a triple-shape memory effect. The final shape fixing ratio is higher than 99%, and the final shape recovery ratio reaches 90%. Therefore, the SMPU–HOBA composites successfully provide a desirable combination of liquid crystalline properties and triple-shape memory properties, making them ideal candidates for smart sensor, smart labels, etc.
研究领域:
高分子材料科学
·
功能高分子
·
智能材料
·
软物质物理
·
材料化学
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2016
·
IF 5.554
Wei Xu,Ruoyu Zhang,Wei Liu,Jin Zhu,Xia Dong,Hongxia Guo,Guo-Hua Hu
Shape memory thermoplastic polyurethane (SMTPU) containing isophorone diisocyanate (IPDI) in hard segment has excellent shape recoverability even after large strain deformation. However, the underlying mechanism of shape recovery remains unclear. In this study, 1,4-phenylene diisocyanate (PPDI) in the polyurethane is gradually substituted by IPDI, and multiscale effects are examined by normal and dichroic Fourier transform infrared spectroscopy (FTIR), small-angle X-ray scattering (SAXS), single-molecule force spectroscopy (SMFS), and mechanical test. Contradictory to the traditional conclusion, the degree of microphase separation decreases as the content of IPDI increases, while the macroscopic shape recoverability is largely improved. With dichroic FTIR and SAXS, we find that the morphology of hard phases changed from lamellar-like to fibrillar-like, which is more stable under stretching. SMFS experiments discover that IPDI could increase the elasticity of polymer chain and could endow the hard phases with “elastic” under stress. With these two factors, we are able to explain the high recoverability of the SMTPU containing IPDI.
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
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2018
·Vol. 56
·期 15
·1711-1720
·
IF 2.588
Chuanwei Lu,Yupeng Liu,Juan Yu,Chunpeng Wang,Jifu Wang,Fuxiang Chu
Fully sustainable shape memory polymers (SMPs) derived from ethyl cellulose (EC, derived from cellulose), tetrahydrofurfuryl methacrylate (THFMA, derived from furfural), and lauryl methacrylate (LMA, derived from fatty acids) were prepared via “grafting from” atom transfer radical polymer (ATRP). The “grafting from” ATRP strategy allows to fabricate SMPs with EC as a backbone, and LMA and THFMA copolymer as a side chain. By utilizing the one-pot and sequential monomer addition approach, two types of SMPs with random/semi-block side chain architectures were obtained, respectively. Random/semi-block side chain architecture of SMPs was confirmed by DSC, DMA, SAXS, and TEM. The presence of microphase separation in the SMPs with semi-block side chain architecture provided two distinct thermal transitions, which was needed for triple-shape memory behavior. Shape memory study showed that SMPs with semi-block side chain architecture exhibited excellent triple-shape memory property, and also had higher shape recovery speed and shape recovery ratio than those with random side chain architecture. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 1711–1720
研究领域:
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuan Cao,Yao Wu,Yiming Huang,Hongping Xiang,Lanyue Zhang
4D printing, combining the advantages of 3D printing and stimuli-responsive materials, provides a precise and rapid fabrication method for complex-shaped smart objects. In this study, the photoisomerization characteristic of azobenzene is used to develop 4D printable resins composed of azobenzene-based acrylates (AZO) and other acrylate compounds, which can be UV-cured and 3D printed into objects with photo and thermal dual responsiveness. UV-curing kinetics reveal that AZO competes with the photoinitiator for photons during photopolymerization, reducing the generation of reactive oxygen species and subsequently affecting the mechanical properties of UV-cured resin. The optimum content of AZO in 4D printing resins is 0.5 wt%, producing 3D printed objects with excellent mechanical properties, including a maximum stress of 25.2 MPa and a strain of 100 %. This ensures the successful formation of complex-shaped objects in the 3D printing process. Moreover, the objects printed with this photosensitive resin demonstrate exceptional shape memory capabilities, achieving a 100 % shape recovery ratio over three cycles of thermal stimulation. The printed openwork spheroid with a concave shape can successfully revert to its original form after 48 s of irradiation with 365 nm UV light. The degree of shape recovery can be precisely controlled by adjusting the UV irradiation time and position. Therefore, these photo/thermal dual-responsive 4D objects show great application prospects in medical devices and smart materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 6
·5136-5148
·
IF 2.993
Zou Faxing,Chen Heng,Chen Shaojun,Zhuo Haitao
Shape-memory polymers with supramolecular switch have received increasing attention. This study reports the synthesis and characterization of supramolecular shape-memory polyurethane based on Cu(II)–pyridine coordination, obtained by mixing pyridine containing polyurethane with CuCl 2 . The results show that there are strong metal–ligand coordination interactions formed between Cu(II) and the pyridine ring in a series of CuCl 2 -doped polyurethane samples. The Cu(II)–pyridine coordination plays a crucial role in the enhanced physical netpoints for outstanding shape-memory properties. Indeed, the so-synthesized CuCl 2 -doped polyurethane exhibits not only a rapid tensile shape recovery but also excellent crimp shape recovery. The CuCl 2 -doped polyurethane containing suitable metal–ligand coordination interactions shows more than 99% shape fixation and more than 95% shape recovery. Our findings promote further applications of shape-memory polymers in multiple engineering fields.
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
POLYMER
·
2025
·
IF 4.5
Dingpeng Peng,Zean lin,Dhandapani Kuzhandaivel,Xiaowen Pu,Lixin Wu,Zixiang Weng
Shape Memory Polymers (SMPs) have emerged as a promising class of intelligent materials because of their unique ability to respond to external stimuli. The proposed method for fabricating magnetic shape-memory polymer composites (DLP-M-SMPs) using digital light processing (DLP) 3D printing technology represents a significant advancement in this field. By combining the shape memory properties of SMPs with their magnetic responsiveness, these composites can overcome the limitations of traditional thermally driven SMPs, such as their narrow operating temperature ranges and poor adaptability to harsh environments. The DLP-M-SMPs developed in this study demonstrated remarkable mechanical properties and shape-memory performance. With a high elongation at break of 760 % at room temperature, these materials exhibit exceptional flexibility and durability. Shape fixation rates exceeding 96 % and shape recovery rates exceeding 99 % indicate their ability to reliably maintain and recover programmed shapes. Furthermore, the successful 3D printing of complex structures capable of shape recovery under magnetic actuation demonstrated the versatility and potential of these materials for various applications. This innovative approach for fabricating high-resolution, high-performance magnetic shape-memory materials opens up new possibilities in fields such as flexible robotics and biomedical engineering, where precise control and adaptability are crucial.
研究领域:
材料科学
·
高分子科学
·
增材制造
·
智能材料与结构
·
生物医学工程
·
柔性机器人
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiaoyun Xu,Zhuang Wang,Qi Zhang,Ke Zhang,Min Li,Jieqiong Yang,Yi Zhao,Qinfei Ke,Qingbao Guan,Jinlian Hu
Fabricating shape-memory materials from natural macromolecules has gained popularity to facilitate the development of bio-friendly smart materials and devices. However, current biobased shape-memory materials have shortcomings, including insufficient mechanical properties and low shape recovery rate in their real applications. Herein, this work aims to develop hierarchically structured keratin-based fibers with high strength and shape-memory properties in response to hydration. The gold nanoparticle is adopted for enhancement in the keratin system, and a well-aligned anisotropic structure with α-helix to the fiber axis is established in the regenerated keratin fibers by wet spinning. The strong crosslinking effect from Au S bonding endows the keratin fibers with outstanding shape-memory performance, exhibiting a shape fixity of ~92 % and a near-full shape recovery rate of ~96 %. In this system, the transition between α and β conformation under external force and water stimulation is assigned as the fundamental mechanism in response to hydration. In hydration and dehydration, the hydrogen bonds act as ‘switches’ that enable deformation, while the strong Au S bonds are ‘net points’ to maintain the original and temporary shapes. This strategy can promote metal nanomaterial anchoring as a methodology for fabricating shape-memory protein-based fibers with excellent mechanical properties and shape-memory performance.
研究领域:
材料科学
·
生物工程
✓ 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
危险品化学品经营许可证（带存储）