POLYMER BULLETIN
·
2025
·
IF 4
Chen Sixian,Fu Jun,Lin Qianbing,Wu Yibo,Shi Qisong
Flexible sensors, due to their unique advantages, are anticipated to find applications in electronic skin, human monitoring, human–computer interaction, and other fields. Among these, flexible strain sensors have garnered significant attention owing to their broad detection range, high sensitivity, and robust anti-interference capability. This paper presents a method for constructing a uniform conductive network within a thermoplastic polyurethane (TPU) matrix by incorporating ionic liquids (ILs) and carbon black nanoparticles (CB). The resulting flexible strain sensor exhibits sensitivities of 1.16 and 2.15 at 0–60% and 60–200% strain levels, respectively. This sensor can accurately monitor various tensile signals and demonstrates response recovery times of 130 ms and 98 ms in tensile mode, and 191 ms and 195 ms in bending mode. Its output signal remains stable after over 200 cycles of 50% strain, indicating excellent durability and stability. Finally, by encapsulating and sewing it onto clothing, it can generate SOS distress signals in two ways, making it a potential tool for emergency calls. This flexible strain sensor showcases superior performance and immense potential in the realm of wearable electronics. Graphic abstract
研究领域:
柔性电子学
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可穿戴传感器
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材料科学
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应急救援技术
·
人机交互
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2024
·
IF 7.6
Zhining Zhuo,Yuehan Ouyang,Xiyue Zheng,Xiaobang Chen,Zequan Lin,Ruitian Zhu,Lan Lan,Dongyang Qian,Rongrong Li,Jixiang Zhu,Yuanye Dang,Yan Wang,Sida Liao,Xiumei Tian,Fanwen Yang
Airway stenosis, a significant cause of dyspnea, is commonly managed with airway stents. However, conventional stents frequently lead to restenosis. Excessive proliferation of fibroblasts and smooth muscle cells during abnormal repair processes is a key factor in airway restenosis. To address this challenge, a novel drug-loaded airway stent has been designed with personalized tailoring for the patient. This stent features a three-layered structure: an outer layer made from a blend of thermoplastic polyurethane (TPU) and Poloxamer 407 (P407), a drug-loading intermediate layer, and an inner layer made of TPU. This design aims to minimize airway irritation and enable adjustable drug release rates by adjusting the drug carrier and/or the content of P407 in the stent’s outer layer. Drug release profile conforms to the Improved First-Order model. Notably, P407 is released from the stent, serving a dual purpose: it creates micropores to regulate the drug release rate and synergizes with PTX to inhibit the proliferation of fibroblasts. This combination significantly enhances the inhibitory effect on the proliferation of fibroblasts and smooth muscle cells, without adversely affecting airway epithelial cells. This may represent a novel approach to reducing restenosis by addressing a critical complication associated with the use of airway stents.
研究领域:
生物医学工程
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药学
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组织工程
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药物递送系统
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Quanyu Wang,Zichao Wang,Zhiqian Li,Pu Liu,Zonglin Pan,Zhaoqian Xie,Yongxin Song,Xuegang Zhang,Ruisong Xu
Obtaining multi-mode tactile information with one sensor in deep sea is greatly needed yet still challenging. In this paper, a flexible deep sea tactile sensor is reported, capable of detecting object's conductivity, hardness, pressing pressure and position simultaneously just by one touch. The sensor works by using single-walled carbon nanotubes doped thermoplastic polyurethane elastomer (SWNTs-TPU film) for differentiating object's conductivity based on the work function difference induced electron transfer. A porous anionic aliphatic waterborne polyurethane film containing carboxyl functional groups (C-WPU) is used for generating ionic currents under pressing to determine the pressing pressure and position and recognize the relative hardness of an object. It is found that the magnitude of current signal generated by a metallic object is much larger than that of an insulative object. The signal magnitude increases with the increase in the applied pressure, the pressing area and the film thickness. Furthermore, completely encapsulating the C-WPU film and introducing carboxylic functional groups significantly improve the sensitivity (maximum 1.2 kPa −1 ). The response time and recovery time of sensing signals are 150 and 530 ms respectively. A pressure detection range of 45–625 kPa is achieved, with a pressure detection resolution of 9.2 kPa. The signal magnitude is decreased only by 10.54% when the sensor is placed under a simulated 100 m water depth. Proof of concept demonstration of underwater object discrimination and hardness recognition with this sensor placed on a mechanical finger of a ROV (Remotely Operated Vehicle) is successfully achieved. This work provides a new solution for multi-modal tactile information sensing in deep-sea environment.
研究领域:
材料科学
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纳米技术
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柔性电子器件
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传感器技术
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水下机器人
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触觉感知
·
聚合物复合材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3495-3504
·
IF 3.665
Kun Cong,Jiyu He,Rongjie Yang
TPU and flame-retardant TPU (FR-TPU) were prepared through a polyaddition reaction with polytetramethylene ether glycol (PTMEG) and 4,4′-methylene-bisphenyl-isocyanate (MDI) by reactive extruding. 1,4-Butanediol (BDO) and diethyl bis(2-hydroxyethyl) amino methyl phosphonate (DBAMP) were used as the chain extender in different ratios, respectively, to obtain TPU and flame-retardant TPU (FR-TPU)with adjusted molecular weight and mechanical properties. The resulting TPU and FR-TPU were characterized by FTIR, DSC, TGA, and NMR. A kinetic model based on the data from extrusion process was used to depict the polymerization of TPU. These reactions carried out without any solvent and the residual water showed that the polymerization with BDO could be achieved in 20 minutes, instead, that with DBAMP in 55 minutes while with a similar molecular weight. These results point out that Twin Screw Extrusion Reaction (TSER) is a suitable and convenient way to produce a variety of polymers.
研究领域:
材料科学
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高分子化学
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化学工程
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2025
·
IF 7.4
Zhao Xinyi,Lin Xiangsheng,Yao Zhao,Li Yuanyue,Li Yang,Gong Ningji
Smart agriculture utilizes sensors and software to control agricultural production through mobile or computer platforms, enabling unmanned, automated, and intelligent management. Recently, research and development in plant growth monitoring technologies have garnered significant attention. The challenge lies in achieving long-term monitoring, phased predictions, and plant self-regulation without harming the plants. The present study demonstrates the fabrication of plant-compatible and breathable tensile and bending strain sensors using composite nanofiber membranes (CNMs) composed of Ti 2 C 2 T x (MXene), carbon nanotubes (CNTs), and thermoplastic polyurethanes (TPU) through electrospinning and ultrasonic immersion techniques. The MXene and CNTs synergistically form a dual-network conductive structure on the TPU nanofiber membrane, thereby imparting the composite membrane with remarkable tensile sensitivity (5.41, 7.39, and 3.39 within the ranges of 0%–20%, 20%–50%, and 50%–70%, respectively) as well as exceptional bending sensitivity (1.79, 0.89, and 0.46 within the ranges of 0°–30°, 30°–90°, and 90°–120°, respectively). The tensile strain sensor, combined with a deep learning Long Short-Term Memory (LSTM) model, establishes a platform for plant growth monitoring and prediction. The bending strain sensor, integrated with a shape memory alloy (SMA)-based soft actuator, forms a plant sensing-actuating system to assist in plant leaf growth. This work leverages MXene/CNTs/TPU CNMs to flexibly prepare strain sensors for specific applications, combining deep learning and soft actuators to achieve plant growth prediction and self-regulation. This research holds significant importance in advancing the development of smart agriculture.
研究领域:
农业工程
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智能农业
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传感器技术
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植物生理学
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纳米材料
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生物机电一体化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhigang Zhan,Wei Wu,Huanbo Hu,Junjian Ye,Lu Cui,Qiuyang Yu,Changxi Chen
This study presents the synthesis of a waterborne polyurethane (WPU-A) emulsion modified with (3-(2-aminoethyl)aminopropyl)trimethoxysilane (AEAPTMS). Self-cleaning materials were developed by applying WPU-A emulsions onto thermoplastic polyurethane (TPU) components, which were shaped using selective laser sintering (SLS), through a post-treatment impregnation and curing method. Additionally, superhydrophobic nano-SiO 2 (sn-SiO 2 ) was incorporated onto the surface of the TPU/WPU-A material. The resulting TPU/WPU-A/sn-SiO 2 self-cleaning composites were created, and the self-cleaning capabilities along with other characteristics of the two TPU-coated materials were examined individually. Findings indicated that the water contact angle for pure TPU measured 123.8°, while the TPU/WPU-A0.5/sn-SiO 2 -20, treated with WPU-A emulsion, exhibited an increased angle of 153.3°, achieving superhydrophobicity. The incorporation of sn-SiO 2 particles enhanced the surface roughness of the TPU/WPU-A0.5/sn-SiO 2 -20 material, facilitating the easy removal of surface contaminants. This enhancement contributes to improved anti-pollution properties and effective self-cleaning performance of the TPU material. The compressive strength of the TPU/WPU-A0.5/sn-SiO 2 -20 skeletonized parts reached 0.733 MPa, representing a 168% increase compared to the pure TPU skeleton. The TPU/WPU-A0.5/sn-SiO 2 -20 material, which is coated with WPU-A and integrated with sn-SiO 2 , demonstrates excellent self-cleaning and mechanical properties, indicating its potential for various applications.
研究领域:
材料科学
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高分子科学
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表面工程
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Xin Zheng,Caixia Zhang,Chuntao Luo,Guanghua Tian,Lian Wang,Yongjin Li
The inclusion complex of thermoplastic polyurethane (TPU) and β-cyclodextrins (β-CD) with high TPU contents has been synthesized. The channel structure with large amount of uncovered TPU was confirmed by wide-angle X-ray diffraction (WAXD). High performance poly(oxymethylene) (POM) alloys were fabricated by simply melt mixing neat POM with the synthesized TPU inclusion complex (IC-TPU). The effects of the incorporation of IC-TPU on the structure and properties of POM have been investigated. Scanning electron microscope (SEM) results showed that IC-TPU was dispersed uniformly in POM matrix and there was robust interface between IC-TPU and POM matrix. Tensile test results indicated significant improvement in both strength and ductility of the IC-TPU modified POM as compared with neat POM. Moreover, the incorporation of IC-TPU resulted in the drastically enhanced thermal stability of POM. The initial degradation temperature increased as high as 40 °C with the addition of a small amount of IC-TPU. The investigation indicated that the IC-TPU exhibited a novel structure with a soft shell (uncovered TPU) and a hard core (β-CD covered TPU segments). Such “soft shell–hard core” structure improves not only the elongation at break but also the tensile strength of POM. The superior thermal stability was originated from the synergetic effects of the hydroxyl groups in β-CDs and the amino groups in TPU. The multifunctional effect of the IC-TPU opens a new avenue for the industrial application of POM.
研究领域:
材料科学
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高分子工程
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Science
·
2022
·Vol. 10
·期 15
·4257-4270
·
IF 7.59
Zhiping Fang,Yuehao Xing,Han Wang,Xue Geng,Lin Ye,Ai-ying Zhang,Yongquan Gu,Zeng-guo Feng
As thermoplastic polyurethane (TPU) elastomers possess good biocompatibility and mechanical properties similar to those of native vascular tissues, they were intended to be co-electrospun with poly(ε-caprolactone) (PCL) onto the outer surface of PCL electrospun small-diameter single-layer vascular grafts (SLVGs) in this study, combining with surface heparinization. In this work, a kind of structurally reinforced TPU+PCL/PCL small-diameter bilayer vascular graft (BLVG) was fabricated via layer-by-layer electrospinning followed by the heparinization of PCL via EDC/NHS chemistry. The resulting (TPU+PCL/PCL)-Hep BLVGs presented excellent mechanical strength and higher compliance, and sustainably released heparin exhibited enhanced anti-coagulation activity. During 6-month implantation in 18 rat abdominal aortas, these vascular prostheses induced the remodeling and regeneration of neovascular tissues, and promoted ECM deposition. Compared to heparinized PCL (PCL-Hep) SLVGs, the formation of aneurysm was completely inhibited and the onset of calcification was significantly delayed in (TPU+PCL/PCL)-Hep BLVGs. Not only vascular cell makers co-expressed by CD206+ cells were identified, but also a high content of elastin was evidenced due to the improvement of mechanical strength and compliance. These results indicated the feasibility and efficacy of inhibiting the aneurysm formation and boosting the vascular remodeling by incorporating TPU into PCL-Hep small-diameter artificial vascular grafts.
研究领域:
组织工程
·
生物材料
·
血管外科
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomaterials Advances
·
2022
·
IF 0
Zhiping Fang,Yonghao Xiao,Xue Geng,Liujun Jia,Yuehao Xing,Lin Ye,Yongquan Gu,Ai-ying Zhang,Zeng-guo Feng
Increasingly growing problems in vascular access for long-term hemodialysis lead to a considerable demand for synthetic small diameter vascular prostheses, which usually suffer from some drawbacks and are associated to high failure rates. Incorporating the concept of in situ tissue engineering (TE) into synthetic small diameter blood vessels, for example, thermoplastic poly(ether urethane) (TPU) ones, could provide an alternative approach for vascular access that profits from the advantages of excellent mechanical properties of synthetic polymer materials (early cannulation) and unique biointegration regeneration of autologous neovascular tissues (long-term fistulae). In this study, a kind of heparinized small diameter (d = 2.5 mm) TPU/poly(ε-caprolactone) (TPU/PCL-Hep) bi-layered blood vessels was electrospun with an inner layer of PCL and an outer layer of TPU. Afterward, the inner surface heparinization was conducted by coupling H 2 N-PEG-NH 2 to the corroded PCL layer and then heparin to the attached H 2 N-PEG-NH 2 via the EDCI/NHS chemistry. Herein a heparinized PCL inner layer could not only inhibit thrombosis, but also provide sufficient space for the neotissue regeneration via biodegradation with time. Meanwhile, a TPU outer layer could confer the vascular access the good mechanical properties, such as flexibility, viability and fitness of elasticity between the grafts and host blood vessels as evidenced by the adequate mechanical properties, such as compliance (4.43 ± 0.07%/ 100 mmHg), burst pressure (1447 ± 127 mmHg) and suture retention strength (1.26 ± 0.07 N) without blood seepage after implantation. Furthermore, a rabbit carotid aortic replacement model for 5 months was demonstrated 100% animal survival and 86% graft patency. Puncture assay also revealed the puncture resistance and self-sealing (hemostatic time < 2 min). Histological analysis highlighted neotissue regeneration, host cell infiltration and graft remodeling in terms of extracellular matrix turnover. Altogether, these results showed promising aspects of small diameter TPU/PCL-Hep bi-layered grafts for hemodialytic vascular access applications.
研究领域:
生物材料
·
组织工程
·
生物医学工程
·
血管外科
✓ 已验证
产品关联
DOI
PubMed
Frontiers in Materials
·
2021
·
IF 3.515
Jin Xin,Sun Siwei,Guo Naisheng,Huang Shuolei,You Zhanping,Tan Yiqiu
The objective of this study aims to investigate the performance of thermoplastic polyurethane elastomers (TPU)-modified asphalt, with special focus on the influence of polyurethane synthesis parameters upon the performance of base asphalt. In this study, the TPU modifier was incorporated into base asphalt to prepare TPU-modified asphalt by using a self-determined laboratory process. The properties of polyester-based TPU and polyether-based TPU modified asphalt with different contents was analyzed by the base performance tests. The Fourier transform infrared spectroscopy (FTIR), fluorescent microscope, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermal gravity (TG), dynamic shear rheology (DSR), and bending beam rheology (BBR) tests were conducted to expose chemical, microstructure, and rheological properties of the asphalt binders, respectively. The results indicated that the modified asphalt with 5% TPU modifier exhibited a favorable performance in terms of the penetration, ductility, softening point, and rotational viscosity, respectively. The isocyanate and polyol reacted to form carbamate in the TPU-modified asphalt, and moreover the isocyanate and aromatic compounds reacted to form halohydrins in the asphalt. Large particles contained in the polyester-based TPU-modified asphalt increased obviously with the increase of Ch (Hard segment content) and r (Isocyanate root index, molar ratio between NCO and OH) value, the fracture mode of it subjected to external load indicated a typical brittle fracture. The content of MDI in the synthesized polyurethane modifier was an important factor affecting the high-temperature stability of the modified asphalt. The polyester-based TPU modifier had a better high temperature performance than the polyether-based TPU modifier. The polyether polyol chain segment showed a greater flexibility as compared to polyester polyol; the addition of polyether polyols can be effectively offset of MDI chain rigidity as r ≤ 1 and Ch < 40% leading to the improvement of the viscoelastic property of asphalt. When Ch = 40% and r = 0.95, the polyether-based TPU-modified asphalt exhibited the same high-temperature grade as the polyester-based TPU-modified asphalt, whereas the polyether-based TPU-modified asphalt showed obviously higher low temperature grades. The polyester-based TPU with Ch = 40% and r = 1 can be used as a modifier to increase the durability of asphalt binders.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Shifan Li,Conglin Dong,Chengqing Yuan,Xiuqin Bai
High performance materials with low friction and high vibration-absorbing properties play a vital role in stable operation of water-lubricated ship stern bearings. Therefore, a TPU composite material reinforced by WS 2 and UHMWPE was prepared. After friction and vibration tests, it was found that WS 2 reduced the coefficient of friction of TPU matrix with its excellent lubricating properties, and after adding UHMWPE, the coefficient of friction continued to drop to 0.07 and became more stable during the whole friction process . The synergistic effect of WS 2 and UHMWPE effectively reduced the friction and amplitude of the composite and made the composite present the best tribological and vibration-absorbing performance. This research provided a basis for the design of new water-lubricated ship bearing materials .
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 8
·1530
·
IF 4.967
Hui Fang,Lingjie Zhang,Anlin Chen,Fangjuan Wu
Polylactic acid (PLA)-thermoplastic polyurethane (TPU) copolymer (PTC) was prepared by melting TPU pellets in molten lactide, followed by in situ ring-opening coordination polymerization. The results from FTIR and1H-NMR confirmed the formation of the copolymer. PLA/TPU blends with different TPU contents were prepared by melt blending method. SEM and mechanical properties showed a conspicuous phase separation between PLA and TPU. In order to further improve the mechanical properties of the blend, PTC was used as the compatibilizer and the effects of the PTC content on the properties of the blend were investigated. The addition of PTC made TPU particles smaller in PLA matrix and improved the compatibility. With the loading of 5 wt.% PTC, the impact strength of the PLA/TPU blend reached 27.8 kJ/m2, which was 31.1% and 68.5% higher than that of the blend without PTC and pure PLA, respectively. As the content of PTC was more than 5 wt.%, the mechanical properties declined since the compatibilizer tended to form separate clusters, which could reduce the part distributed between the dispersed phase and the matrix, leading to a reduction in the compatibility of the blend. Moreover, the DMA results confirmed PTC could improve the compatibility between PLA and TPU.Keywords:polylactic acid;thermoplastic polyurethane;in situ polymerization;compatibility
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）