FERROELECTRICS
·
2019
·
IF 0.697
Jun Liu,Yuguo Zhuo,Zefeng Zhang,Qingshan Li,Xiaofeng Guo,Xuejun Ren
TiO2/WPU/PVA nanofibers were prepared by electrospinning with modified nano-TiO2, waterborne polyurethane (WPU) and polyvinyl alcohol (PVA) as main materials that were blended mechanically. The nanofibers morphologies and physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG), Fourier transform infrared (FTIR) spectroscopy and UV-visible (UV-Vis) spectroscopy. Scanning electron microscopy observations revealed that nano-TiO2 was modified by r-aminopropyltriethoxysilanehe in order to improve the dispersion of nano-TiO2 in WPU/PVA matrix and the spinning quality of composite fibers was improved by adding proper amount of modified nano-TiO2. When the content of modified nano-TiO2 was 1%, the composite fibers with uniform diameter distribution were obtained. Results from FTIR and TG suggested that modified nano-TiO2 had been successfully introduced to the WPU/PVA nanofibers and TiO2/WPU/PVA nanofibers had the best thermal stability when the content of modified nano-TiO2 was 1%. Results from UV-Vis suggested that the photocatalytic performance of composite nanofibers that degraded methyl orange was enhanced by the addition of modified nano-TiO2.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 59
·37194-37204
·
IF 3.361
Muqun Wang,Yuxuan Qin,Wei Gao,Shaofeng Liang
With the rapid increase of intelligent communication equipment, electromagnetic pollution is becoming more and more serious, and the research and application of high-performance electromagnetic shielding materials have attracted great attention from the academic and engineering circles. Traditional metal-based electromagnetic shielding materials have high reflection loss, high density, and are difficult to process. Polymer-based materials with carbon materials as fillers have the advantages of flexibility, light weight, corrosion resistance and low processing costs. They have become the most important materials in the field of electromagnetic shielding in recent years. However, the conductivity of conductive polymer materials is not high. Therefore, improving the electromagnetic shielding performance and the proportion of absorption loss under low density conditions have become key issues for polymer-based electromagnetic shielding materials. MWCNT/MCHMs/WPU composites were prepared by a solution mixing method, with 20 wt%, 40 wt%, 60 wt% MWCNTs and 40 wt% MWCNT/10 wt% MCHMs as fillers. By comparing the effects of different MWCNT content and MCHMs on the dielectric properties, electromagnetic shielding properties and mechanical properties of the MWCNT/MCHMs/WPU composites, the relationship between the structure and properties of the composites has been explored. The 0.6 mm WPU/60 wt% MWCNT composite has an electrical conductivity of 95.4 S m−1 and an electromagnetic shielding effectiveness of 40 dB in the X band. Adding 10 wt% MCHMs to the WPU/40 wt% MWCNT composite material can significantly improve the composite. The δ of the material increased from 51.2 S m−1 to 55.4 S m−1, and the SE increased from 30 dB to 33 dB. The research results show that the increase in MWCNT content and MCHMs is beneficial to improving the electrical conductivity and electromagnetic shielding performance of the composite materials.
研究领域:
材料科学
·
电磁学
·
聚合物科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 5
·1164-1171
·
IF 2.578
Mengmeng Song,Meng Zhou,Hengfeng Hu,Heqing Fu
First, attapulgite-Fe 3 O 4 magnetic filler (ATP-Fe 3 O 4 ) was prepared by using a chemical precipitation method. Subsequently, graphite oxide (GO) was prepared through Hummer method, and then reduced GO (RGO) was prepared through GO reduced by chitosan (CS). Finally, a series of WPU-RGO/ATP-Fe 3 O 4 /CS composites were prepared by introduced RGO/ATP-Fe 3 O 4 /CS to waterborne polyurethane. The structure and properties were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD), vibrating sample magnetometry (VSM), thermogravimetric analysis TGA, conductivity test, and tensile test. The experimental results indicated that thermal stability and tensile strength of nanocomposites were improved with the increase of the content of RGO/ATP-Fe 3 O 4 /CS. Meanwhile, with the increase of the RGO/ATP-Fe 3 O 4 /CS content, the electrical and magnetic properties of WPU-RGO/ATP-Fe 3 O 4 /CS composites were improved. When the content of RGO/ATP-Fe 3 O 4 /CS was 8 wt%, the electrical conductivity and the saturation magnetic strength of WPU-RGO/ATP-Fe 3 O 4 /CS composites were 3.1 × 10 −7 S·cm −1 and 1.38 emu/g, respectively. WPU-RGO/ATP-Fe 3 O 4 /CS composites have excellent electrical and magnetic properties.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhen Wang,Lili Wang,Runze Chang,Mengxuan Shi,Deshuai Sun
With the increasing popularity and rapid development of portable and wearable electronics, it has become extremely crucial to employ electromagnetic interference (EMI) shielding materials that efficiently reduce the ensuing radiation pollution. Nonetheless, the substantial thickness and poor mechanical properties of most EMI-shielding materials have hindered their implementation in portable and wearable electronics. Herein, a facile alternating vacuum-assisted filtration strategy was used to fabricate an ultrathin and flexible multilayer MXene/WPU film for EMI shielding applications. It possesses excellent mechanical properties, including a tensile strength of 71.11 MPa, a toughness of 1.79 MJ m −3 , and a strain at failure of 5.46%. The alternating multilayer MXene/WPU film enhanced the EMI shielding performance, which exhibits a 52 dB EMI shielding efficiency (SE) and a thickness specific SE of 6407.97 dB cm 2 g −1 with a thickness of 35 µm. In addition, as synthesized composite film possesses high electrical conductivity of 487.95 S m −1 . This strategy is essential for preparing ultrathin, flexible composites with high EMI shielding capability and expanding the practical applications of composites based on MXene .
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jianzhong Ma,Chenyang Liu,Yuehong Zhang,Yufei Dong,Chao Liu,Zhonglei Ma
A variety of nano SiO 2 microspheres with negative charge or positive charge were prepared by hydrochloric acid treatment or/and γ-mercaptopropyltrimethoxysilane modification respectively. The obtained modified SiO 2 with different content of -OH or -SH and different charges were physically introduced into water-borne polyurethane (WPU) dispersion to fabricate the WPU/modified SiO 2 nanocomposites with interfacial interaction of hydrogen bond and electrostatic interaction . The influence of interfacial interaction (hydrogen bond and electrostatic interaction) between WPU and modified SiO 2 on the interface structure and mechanical properties of the WPU/modified SiO 2 nanocomposites were investigated. The results showed that when both hydrogen bond and electrostatic interaction were present between WPU and modified SiO 2 , the microstructure and the tensile strength of the WPU/modified SiO 2 nanocomposite were mainly affected by the electrostatic interaction, while the elongation at break was mainly affected by the hydrogen bond interaction. Overall, a methodology of the combination of molecular dynamics simulation and experiment study was established to reveal the influence of surface characteristic of SiO 2 on the interface interaction and mechanical properties of the WPU/modified SiO 2 nanocomposites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Jianming Zhao,Miaojie Shi,Yajie Xie,Chao Ning,Kun Qiao,Runzheng Jiang,Abudureheman Bahatibieke,Yudong Zheng
To engineer a hydrogel elastomer for use as an in vivo tissue replacement, it is imperative to ensure superior fatigue resistance, guaranteeing a prolonged service life. Investigating the molecular mechanisms of strain energy accumulation and transmission, which occur during the compression of elastomeric materials, is instrumental in elucidating the causes of hydrogel material fatigue. Such insights are of immense value for the development of durable artificial tissue replacements, ensuring their longevity and sustained functionality within the human body. We synthesized hydrogel elastomers through polyvinyl alcohol (PVA) and waterborne polyurethane (WPU) with good biocompatibility, and studied their fatigue behavior through molecular dynamics (MD). The results of this analysis demonstrate that the introduction of energy dissipation structures between mechanically supported molecular frameworks can enhance the relaxation efficiency of polymers. This improvement leads to enhanced resistance of hydrogels to compression fatigue. A total of 1,000,000 cycles of compression tests were conducted to verify that WPU/PVA did not exhibit any significant compression fatigue under high stress of 50 % strain. In contrast, PVA hydrogel exhibited obvious fatigue due to the absence of an energy dissipation structure. These results revealed the source of compression fatigue resistance of hydrogel elasticity and provided powerful guidance for the design and synthesis of artificial tissues.
研究领域:
生物材料学
·
分子生物学
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Hong Lei,Yang Qiu,Zhijuan Pan,Bin He,Tao Yan
The development of conductive polyester (PET) fibers is of great significance in increasing their added value and application in functional textiles. However, the continuous preparation of conductive PET fibers with high strength and durability is still a challenge. In this work, polypyrrole/waterborne polyurethane (PPy/WPU)/PET composite conductive fibers (PWPFs) were continuously prepared by in-situ polymerization of blended pyrrole (Py)/WPU. The study investigated the effects of alkali concentration and treatment time on the moisture regain rate of PET fibers to improve the hydrophilicity. The effects of polymerization cycles and mass fraction of WPU on the microstructure and electrical property of PWPFs were studied. The result demonstrated that the moisture regain of PET fibers increased from 0.45 % to 1.13 % when treated in a 50 g/L NaOH solution for 6 h. A stable composite structure of WPU/PPy was formed on the surface of conductive PET fibers, prepared with 5 polymerization cycles and a WPU mass fraction of 5 wt%, achieving a resistance of 58.41 kΩ/cm. The PPy/WPU composite conductive layer partially compensated for the mechanical properties lost by PET fibers during alkaline treatment. Notably, the abrasion resistance and washing resistance of PWPFs were excellent. The conductivity of PWPFs was highly correlated with the environmental humidity, temperature, salinity, and ultraviolet light irradiation and recoverable when environmental conditions underwent cyclic changes, which demonstrated that the PWPFs could be used for multi-functional sensing applications.
研究领域:
材料科学
·
高分子科学
·
纺织工程
·
传感技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yu He,Yuanya Zhang,Xiangqian Xu,Yanlin Zhu,Yuxiang Liu,Junya Yuan,Xuehu Men
Tribological behaviour of polyurethane/epoxy interpenetrating polymer network (PU/EP IPN) as friction materials was investigated. This was a combination of the good flexibility of PU and high hardness of EP to realize polymer synergistic effect of interpenetrating network structure, aiming to broaden and develop the application of polymer-based composites in friction engineering materials. A novel CNF/MXene/WPU aerogel (CMW) was prepared by employing flexible NCO-terminated waterborne polyurethane prepolymer (WPU) as the supporting skeleton of aerogel, and synchronously combining the reinforcing-phase carbon nanofibers (CNF) and lubricating-phase MXene. Subsequently, the prepared ultralight porous yet mechanically robust CMW aerogels were encapsulated with IPN by vacuum impregnation. As expected, the addition of aerogel imparted IPN matrix with enhanced thermal and tribological properties due to the thermal dispersion and enhancement effects conferred on the matrix by the highly aligned and ordered three-dimensional interconnected structure of aerogel. Meanwhile, CMW reinforced IPN composites were explored for the formation of a high-quality transfer film on the contact surface during friction. The transfer film prevented direct contact between the friction couples, which facilitated the improvement of wear resistance of composites, thus giving this material great potential for tribological applications.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2025
·
IF 4.6
lily wang,Fajun Peng,Di Jin,Sen Fang,Yan Wang
As demands increase for multifunctional textiles and breathable coatings in high-humidity and high-mobility environments, the development of membranes that combine waterproofing, breathability, and mechanical durability has become a critical challenge. This study presents a novel, organic solvent-free electrospinning approach to fabricate waterborne polyurethane (WPU)-based nanofiber membranes, enhanced by polyacrylamide (PAM) as a dual-functional additive. By leveraging hydrogen bonding interactions between the –COO⁻, –NHCOO– groups in WPU and the –CONH₂ groups in PAM, the resulting composite achieved stable electrospinning, improved fiber morphology, and a significantly higher water contact angle (86.9°), compared to conventional WPU/PVA systems (<10°). The optimized WPU/PAM-3 membrane maintained high air permeability and excellent tensile strength, while also showing low water absorption (~18%) and strong structural stability under thermal, mechanical, and environmental cycling. Structural analyses via FTIR, XRD, and XPS confirmed enhanced interfacial compatibility and molecular interaction. Notably, this work eliminates the need for volatile organic solvents and hygroscopic additives like PVA, solving common limitations in traditional WPU systems. The resulting membrane offers a sustainable, high-performance solution for protective textiles, medical materials, and flexible barrier coatings, marking a significant advancement in eco-friendly, breathable membrane technology.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
环境工程
·
纺织工程
✓ 已验证
产品关联
DOI
PubMed
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
·
纳米技术
·
柔性电子器件
·
传感器技术
·
水下机器人
·
触觉感知
·
聚合物复合材料
✓ 已验证
产品关联
DOI
高影响因子
BIOMATERIALS
·
2018
·
IF 8.806
Zhenqi Jiang,Yuchen Tian,Dingying Shan,Yinjie Wang,Ethan Gerhard,Jianbi Xia,Rong Huang,Yan He,Aiguo Li,Jianchao Tang,Huimin Ruan,Yong Li,Juan Li,Jian Yang,Aiguo Wu
Nanoparticle-based tumor therapies are extensively studied; however, few are capable of improving patient survival time due to premature drug leakage, off target effects, and poor tissue penetration. Previously, we successfully synthesized a novel family of Y 1 receptor (Y 1 R) ligand modified, photoluminescent BPLP nanobubbles and nanoparticles for targeted breast cancer ultrasound imaging ; however, increased accumulation could also be observed in the liver, kidney, and spleen, suggesting significant interaction of the particles with macrophages in vivo . Herein, for the first time, we imparted antiphagocytosis capability to Y 1 R ligand functionalized BPLP-WPU polymeric micelles through the incorporation of a CD47 human glycoprotein based self-peptide. Application of self-peptide modified, DOX loaded micelles in vivo resulted in a 100% survival rate and complete tumor necrosis over 100 days of treatment. In vivo imaging of SPION loaded, self-peptide modified micelles revealed effective targeting to the tumor site while analysis of iron content demonstrated reduced particle accumulation in the liver and kidney, demonstrating reduced macrophage interaction, as well as a 2-fold increase of particles in the tumor. As these results demonstrate, Y 1 R ligand, self-peptide modified BPLP-WPU micelles are capable of target specific cancer treatment and imaging, making them ideal candidates to improve survival rate and tumor reduction clinically.
研究领域:
癌症治疗
·
纳米医学
·
药理学
·
分子影像
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 12
·e202204620
·
IF 2.1
Yuhang Wang,He Huang
Graphical Three cationic waterborne polyurethanes (CWPUs) and three non-ionic WPUs (NWPUs) were prepared by using three polyether diols with same molecular weight but different chemical structures as the soft segments, their dye fixation performances were compared and the dye fixation mechanism of WPU was explored. Waterborne polyurethane (WPU) has been widely used in the field of dye fixation and different fixation mechanisms have been proposed. However, questions on the impact of each fixation mechanism on dye fixation and the internal relationship between each mechanism remained. In this work, three cationic WPUs (CWPUs) and three non-ionic WPUs (NWPUs) were first prepared to answer the question whether the fixation performance of non-ionic WPU was necessarily worse than that of cationic WPU with similar composition. Two kinds of reactive CWPUs, including epoxy and isocyanate end groups, were prepared to investigate whether the reactive groups on WPU-type dye fixing agent reacted with the groups on the fabric. A small molecular cationic dye fixing agent derived from the hydrophilic cationic chain extender of WPU was also synthesized, aiming to explore the relationship between the mechanisms of film formation and the formation of color lake.
研究领域:
材料科学
·
纺织化学
·
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）