MATERIALS & DESIGN
·
2025
·
IF 7.9
Ruichao Zu,Wenzheng Chen,Yicang Huang,Yujie Chen,Chengzhen Du,Qunfu Fan,Hua Li,Hezhou Liu
Commercially available thermoplastic polyurethane (TPU) materials for 3D printing often exhibit inadequate damping properties, limiting their application in damping scenarios. However, 3D printing TPU filaments specifically engineered for enhanced damping performance frequently lack sufficient stiffness, causing printing continuity issues. To address these challenges, this study investigates the rational design of TPU composites by regulating TPU molecular structure and incorporating polylactic acid (PLA) to enhance both damping performance and stiffness. The results reveal that a prepolymer curing coefficient of 2.0, combined with a chain extender ratio of Dimethyl thio-toluene diamine (DMTDA) to 1,4-Butanediol (BDO) at 5:5, optimizes the damping and mechanical properties of the TPU material. Furthermore, by incorporating 30 wt% PLA particles into the TPU matrix, the obtained TPU7/PLA3 composite filament has excellent printability and admirable damping properties with a peak damping value of 0.60 around room temperature and an effective damping temperature range exceeding 100 °C. A lattice structure resembling Kelvin foam was successfully fabricated using the TPU/PLA filaments, demonstrating superior damping performance compared to commercial TPU filaments and underscoring its potential for energy absorption applications.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Sensor Research
·
2023
·
IF 0
Tianqing Liu,Danyao Qu,Lihao Guo,Gandong Zhou,Guangjian Zhang,Tao Du,Weiwei Wu
Human respiration reflects abundant physiological information and could enable non-invasive monitoring, providing information about various biological parameters such as respiration rate and depth. The rapidly growing field of humidity sensors bring forward the requirement for good performance. In this work, by virtue of good hydrophilicity and conductivity, a MXene/thermoplastic polyurethane (TPU) composite film is prepared by coating MXene nanosheets on chitosan-modified TPU electrospun nanofibers via electrostatic interactions, for fabricating a humidity sensor. Based on the principle that the tunnel resistance changing with water molecules influences the distance of MXene nanosheets, the MXene/TPU humidity sensor exhibits fast response (12 s), wide humidity response range (11–94% RH), low hysteresis (<7% RH), and excellent repeatability. The humidity sensor can be assembled with a face mask for distinguishing different human respiration patterns and accurately monitoring respiratory signals during different physical activities, suggesting its promising applications in the fields of respiratory monitoring.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yanzhi Cai,Dengpeng Chen,Laifei Cheng,Siyu Guo,Zhongyi Hu,Yuhan Wang,Haiming Yu,Yuan Zhou
The performance of sensors is often limited by the structural characteristics of the single form of conductive filler, making it difficult for sensors to simultaneously consider the broad sensing range and high sensitivity. How to achieve high sensitivity and broad working range of sensors through innovative sensing materials and sensor structure design remains a challenge. Here, a flexible sensor with multidimensional sensing materials and a double-layer structure is constructed. It consists of a high-performance CNTs@Ag-MXene-TPU sensing layer and a TPU flexible layer with significant deformability. Thanks to the synergistic effect of the double-layer structure and multidimensional sensing materials, this sensor has a high sensitivity of up to maximum gauge factor of 12216.3 and a wide sensing range of 300 %. Its response time and recovery time can reach 200 and 250 ms, respectively, and it also exhibits excellent cycling stability.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2020
·Vol. 21
·期 12
·4224
·
IF 4.556
Wenxiu Yang,Yonggui Li,Long Feng,Yimiao Hou,Shuo Wang,Bo Yang,Xuemin Hu,Wei Zhang,Seeram Ramakrishna
Photothermal conversion materials have attracted wide attention due to their efficient utilization of light energy. In this study, a (GO)/Bi2S3-PVDF/TPU composite nanofiber membrane was systematically developed, comprising GO/Bi2S3nanoparticles (NPs) as a photothermal conversion component and PVDF/TPU composite nanofibers as the substrate. The GO/Bi2S3NPs were synthesized in a one-step way and the PVDF/TPU nanofibers were obtained from a uniformly mixed co-solution by electrospinning. GO nanoparticles with excellent solar harvesting endow the GO/Bi2S3-PVDF/TPU membrane with favorable photothermal conversion. In addition, the introduction of Bi2S3NPs further enhances the broadband absorption and photothermal conversion properties of the GO/Bi2S3-PVDF/TPU composite membrane due to its perfect broadband absorption performance and coordination with GO. Finally, the results show that the GO/Bi2S3-PVDF/TPU composite membrane has the highest light absorption rate (about 95%) in the wavelength range of 400–2500 nm. In the 300 s irradiation process, the temperature changes in the GO/Bi2S3-PVDF/TPU composite membrane were the most significant and rapid, and the equilibrium temperature of the same irradiation time was 81 °C. Due to the presence of TPU, the mechanical strength of the composite film was enhanced, which is beneficial for its operational performance. Besides this, the morphology, composition, and thermal property of the membranes were evaluated by corresponding test methods.Keywords:graphene oxide/bismuth sulfide;solar distillation;nanofiber membrane;photothermal conversion
研究领域:
材料科学
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纳米技术
·
太阳能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 7
·1-11
·
IF 2.6
Yang Rui,Dai Zilin,Kong Zhenxing,Ou Juhua
Procuring silicone rubber composite with different content of vinyl MQ silicone resin was prepared and its thermal stability was evaluated. A total of 50 wt% MQ resin containing 5 wt% vinyl MQ exhibited optimal thermal stability and was consequently chosen. This silicone rubber composite was blended with TPU at high temperature using an internal mixer to produce a modified TPU. The TPU modified by silicone rubber was firstly investigated by Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). The FTIR results indicated that negligible chemical reactions occurred between TPU and silicone rubber during the mixing process. Furthermore, the TGA results demonstrated that the silicone rubber composite positively influenced the thermal stability of TPU. Additionally, the modified TPU displayed satisfactory thermal stability even after aging. Moreover, Scanning Electron Microscope (SEM) results indicated that uniform dispersion of silicone rubber was facilitated by the banburying method. The tensile strength of modified TPU initially increased and then decreased when the content of silicone rubber reached 3 wt%. On the other hand, the elongation at break of modified TPU demonstrated continuous improvement. Furthermore, the mechanical properties of the modified TPU were still acceptable after aging.
研究领域:
材料科学
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化学工程
✓ 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
Zhixiang Cui,Shengnan Tian,Xiaolong Liu,Qianting Wang,Sen Zeng,Junhui Si
The efficient elimination of toxic dye and Cr(VI) from wastewater by photocatalysis is still a challenge due to the unsatisfactory photocatalytic efficiency and difficult separation of the photocatalyst . Herein, the thermoplastic polyurethane (TPU) fiber membrane was prepared by electrospinning and then titanium dioxide (TiO 2 ) nanoparticles were loaded on the fiber membrane by ultrasonic-assisted method, followed by in-situ polymerizations of polyaniline (PANI) on the surface of the membrane. The synergistic effect of TiO 2 and PANI results in faster charge migration and more efficient separation of photogenerated charge carriers. Photocatalytic experiments revealed that TPU/TiO 2 /PANI fiber membranes were highly efficient for dye degradation and Cr(VI) reduction under visible light irradiation. 99.7 % of Congo red was degraded by TPU/TiO 2 /PANI membrane within 30 min, and the reaction rate reached 0.2 min −1 . The Cr(VI) reduction efficiency was up to 99.0 % within 25 min with a reaction rate of 0.128 min −1 . Additionally, the TPU/TiO 2 /PANI membrane exhibited a low loss in catalytic activity even after recycling 10 times, suggesting superior recycling stability compared to TPU/TiO 2 membrane. The result of the electron spin resonance (ESR) experiment showed that superoxide radicals (-O 2 - ) and hydroxyl radicals (-OH - ) were involved in the photocatalytic degradation process. The prepared TPU/TiO 2 /PANI fiber membrane combined with excellent photocatalytic capacity, good stability and easy recovery makes it a good candidate for removing dye and Cr(VI) from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Sishi Li,Qiang Fu,Chunxu Pan
Wearable flexible strain sensors have attracted increasing research interest due to their potential applications in motion detection, healthcare, human-computer interaction, and artificial intelligence. In this work, a novel kind of conductive PDMS/(CB+CNTs)/TPU composite was prepared and applied for assembling a flexible strain sensor, i.e., thermoplastic polyurethane (TPU) as a polymer matrix , carbon black (CB) and carbon nanotubes (CNTs) as hybrid conductive nanofillers, and then modified by polydimethylsiloxane (PDMS) for achieving super-hydrophobicity. Experimental results reveal that the sensor exhibits the advantages: 1) Excellent mechanical properties , i.e., the tensile strength of the composite increased from 5.88 MPa to 8.88 MPa; 2) Excellent sensing performances, i.e., the highest sensitivity up to 49,863.5, and high repeatability and durability during a cyclic tension-release test (50% strain); 3) Multi-functions include good electrical conductivity , super-hydrophobicity with a static water contact angle as high as 152°, and favorable flexibility; 4) It possessed a high cost-performance ratio due to the simple preparation process, i.e., electrospinning, ultrasonic adsorption treatment, and PDMS modification, and cheap raw materials, such as PDMS, CB, and TPU when compared with similar sensors. The sensor is applied to monitor and detect the full range of human body movements, such as joint movement, breathing, coughing, and speaking, which shows broad application prospects in wearable electronic products.
研究领域:
材料科学
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生物医学工程
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电子工程
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产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 5
·859
·
IF 4.967
Xiujuan Wang,Xiaoyu Gao,Yu Wang,Xin Niu,Tanyu Wang,Yuanjun Liu,Fangxi Qi,Yaming Jiang,Hao Liu
In recent years, the research of flexible sensors has become a hot topic in the field of wearable technology, attracting the attention of many researchers. However, it is still a difficult challenge to prepare low-cost and high-performance flexible sensors by a simple process. Three-dimensional spacer fabric (SF) are the ideal substrate for flexible pressure sensors due to its good compression resilience and high permeability (5747.7 mm/s, approximately 10 times that of cotton). In this paper, Thermoplastic polyurethane/Polypyrrole/Polydopamine/Space Fabric (TPU/PPy/PDA/SF) composite fabrics were prepared in a simple in-situ polymerization method by sequentially coating polydopamine (PDA) and Polypyrrole (PPy) on the surface of SF, followed by spin-coating of different polymers (thermoplastic polyurethane (TPU), polydimethylsiloxane (PDMS) and Ecoflex) on the PPy/PDA/SF surface. The results showed that the TPU/PPy/PDA/SF pressure sensors prepared by spin-coating TPU at 900 rpm at a concentration of 0.3 mol of pyrrole monomer (py) and a polymerization time of 60 min have optimum sensing performance, a wide working range (0–10 kPa), high sensitivity (97.28 kPa−1), fast response (60 ms), good cycling stability (>500 cycles), and real-time motion monitoring of different parts of the body (e.g., arms and knees). The TPU/PPy/PDA/SF piezoresistive sensor with high sensitivity on a highly permeable spacer fabric base developed in this paper has promising applications in the field of health monitoring.Keywords:space fabric;Polypyrrole (PPy);piezoresistive sensors;thermoplastic polyurethane (TPU) coating
研究领域:
材料科学
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柔性电子
·
健康监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Changhong Lai,Song Wang,Pian Zhong,Yanyan Chen,Juan Xu,Xiaoli Li,Weiqiang Liu
Vascular interventional catheters are generally made of hydrophobic polymers , which may lead to vascular injury, poor lubrication and other consequences due to friction with vascular wall or stent in the process of intervention. In this study, the PDA-PVP/PEG composite coating was prepared based on common TPU catheter material to improve its hydrophilic lubrication behavior. Firstly, the oxidative self-polymerization of dopamine (PDA) was initiated and deposited on the surface of TPU in a weak alkali environment, and then the PVP/PEG coating was prepared by UV curing with PDA as the intermediate adhesion layer . The composite coating was optimized step by step by lubricating material system, process parameters, molecular weight , and concentration. Compared with the blank control group, the water contact angle decreased from 91.3° to about 28.3°, and the friction coefficient decreased from 0.4 to about 0.03, and the composite coating was not damaged after 30 min of reciprocating sliding. The results of cytotoxicity grade Level 1 and hemolysis rate less than 5 % also proved that the composite coating showed good cytotoxicity and blood compatibility. In summary, the PDA-PVP/PEG hydrophilic lubricating composite coating revealed excellent comprehensive properties.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yi Wang,Qiming Chen,Chao Liu,Shuo Li,Wei Wu
Cu@TPU composite particles with a structure of TPU core and Cu particles shell were fabricated by in-suite reduction of Cu on the surface of TPU granules. The Cu@TPU composites were then prepared by the hot compression of the as-prepared core-shell particles. The Cu@TPU composite granules were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy, which verified that the outer layer of core-shell structure was Cu particles and the connection between Cu and TPU was chemical bonding. The cross-section of Cu@TPU composites showed typical pattern of segregated structure and the surface of those was covered by a layer of Cu particles. With the stacking effect of the special location of Cu and the chemical connection between Cu and TPU, the Cu@TPU composites exhibited a high thermal conductivity of 3.2146 W/m K at 23 vol% filler loading, which was 2.6 times to that of Cu/TPU composites fabricated through simple blending. The TC data of the composites were correlated with Foygel’s model. In addition, the dielectric properties and electrical conductivity of the composites were measured.
研究领域:
材料科学
·
热传导工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Jiang He,Siyuan Wang,Renhou Han,Yue Liu,Wenchao Gao,Rongrong Bao,Caofeng Pan
The high sensitivity and wide linear sensing range are two crucial performance parameters for pressure sensors. This paper presents a flexible pressure sensor based on a 3D interlocking structure resembling the biomimetic dog-tail grass. The 3D interlocking structure of TPU/ZnO nanowires (NWs) uniformly increases with the applied pressure, resulting in a proportional increase in the contact area. Simultaneously, ZnO NWs form an upper sparse and lower dense structure on the TPU skeleton, enabling it to withstand exceptionally high pressures. Leveraging these advantages, the flexible pressure sensor exhibits elevated sensitivity (29.7 kPa −1 ) and an ultra-wide linear sensing range (up to 2250 kPa), representing a significant improvement compared to prior research. The sensor demonstrates outstanding performance in terms of repeatability and stability. Furthermore, applications in wearable electronic devices and pixel analysis in pressure array configurations are demonstrated, showcasing high performance achieved through straightforward and cost-effective fabrication methods, thereby offering a promising strategy for future developments in flexible electronic devices.
研究领域:
材料科学
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传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 31
·e202402076
·
IF 1.9
Hengyi Cheng,Xun Zhang,Tao Zhang,Yixiang Chen,Dan Yu,Wei Wang
Graphical The figure shows the preparation process of TPU/PDA/MXene composite fibers. TPU fibers were first prepared by dissolving TPU particles in a certain amount of DMF solution, but since TPU fibers are inherently non-conductive, it was necessary to surface modify the TPU fibers. PDA was polymerized in situ on the fiber surface and then placed in MXene solution for ultrasonication to obtain composite fibers. With the development of the ageing society, wearable strain sensors have great application prospects in the fields of health detection, artificial intelligence, and motion recognition. However, traditional forms of film-like strain sensors suffer from low sensitivity, adhesion, and impermeability during use, which severely limit their practical applications. To overcome these problems, we propose a strategy to fabricate polyurethane/polydopamine/MXene (TPU/PDA/MXene) composite fibers by wet spinning. Furthermore, the outside is wrapped with (PDMS), giving mechanical strength and chemical resistance. Through a simple and low-cost wet spinning process, TPU/PDA/MXene fibers are achieved in the preparation of flexible strain sensors, and they can be woven into various forms with good flexibility and comfort according to practical needs. The results indicated that the prepared flexible strain sensor exhibits a high gauge factor (GF) of 57.15 over a large strain range (300 %), which are superior to those of many fiber-based sensors. Their application properties were also measured by attaching them to fingers, wrists and knees, showing high sensitivity, mechanical durability and chemical stability, and has great potential for wearable strain sensors and flexible strain sensors in complex environments.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 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）