JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 38
·50971
·
IF 3.125
Yanqing Zhao,Yingli Su,Wangcai Zou,Gang Chen,Yiqing Deng,Jun Cheng,Haisheng Ren,Qiang Zhao
In order to prepare waterborne polyurethane with excellent water resistance and thermodynamic properties, a series of side chain fluorinated waterborne polyurethane-urea (FWPU-UA) was synthesized with polytetramethylene ether glycol, N -(2-methyl-1,3-propanediol-2′-)-perfluoro-1-butanesulfonyl amine (NPBA), isophorone diisocyanate, and isophoronediamine. With the increase of NPBA content, the weight loss temperature, glass transition temperature, and tensile strength of FWPU-UA were all improved. Gaussian fitting analysis of infrared data and density functional theory simulation proved that the introduction of fluorine side chains increased the interaction of hydrogen bonding in the FWPU-UA. X-ray photoelectron spectroscopy analysis indicated that the aggregation of fluorine atoms on the surface of film were caused by the migration and enrichment of fluorine side chains. Furthermore, the water resistance of polyurethane-urea film could be significantly improved by adding a small amount of NPBA, and the seven-day water absorption rate of polyurethane-urea film was reduced from 30.13% to 12.55%.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Dongfei Zhang,Ao Wang,Wenkai Liu,Ao Zhen,Jiehua Li,Feng Luo,Xianglong Han,Zhen Li,Hong Tan
The reported dynamic covalent bonds (DCBs) exhibit certain drawbacks, including sluggish reaction rates and high dissociation temperatures, which impede the reusability of DCBs cross-linked polymers. Herein, we develop a kind of imidazole-urea bond (IUBs) through the rapid self-catalytic reaction between imidazole and isocyanate without additional catalysts. The IUBs are found to be highly reversible via a thermally dissociative mechanism while also demonstrating an irreversible exchange with amines. Then, histamine (1H-imidazole-4-ethanamine) is first employed as a chain extender to construct IUBs in the synthesis of novel imidazole-based cross-linked polyurethane-ureas (IMCPU). The IMCPU can undergo multiple recyclings of melt processing and be aminolyzed even at room temperature. Given the wide availability of the commodity histamine, IMCPU exhibits great potential for broad applications in the fields of dynamic materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Yubin Li,Zhijian Yang,Ling Ding,Liping Pan,Jianhu Zhang,Xue Zheng,Congmei Lin
Damages generated in functional materials can deteriorate their performance and shorten their lifetime, endowing the materials with self-healing ability is expected to resolve this problem. In this work, a novel energetic composite refers to CL-20 based PBX, which can self-heal its mechanical damage under a mild condition, was designed and prepared via incorporating disulfide bonds into the polymeric binder. The highly efficient self-healing polyurethane-urea containing disulfide bonds (DSPU) was synthesized by using the prepolymer of poly(caprolactone) diol (PCL-diol) with isophorone diisocyanate (IPDI) as the main-chain to achieve good mechanical toughness, then cross-linking with bis(4-aminophenyl) disulfide (APD) to gain the superior reversibility. The CL-20 based PBX using this DSPU as binder can evidently self-heal its inner damage, i.e. micro-crack, after heating at 60 °C for several hours, and the strength of the damaged sample after Brazilian test can also be recovered to more than 70% of the pristine value.
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
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jiexiang Tong,Subin Xie,Jia-Tao Miao,Jing Luo,Ren Liu
Polyurethane-urea acrylate (PUUA) has been used to develop mechanically robust materials, due to the urea-based bifurcated H-bond. However, the uncontrollable reaction rate between diamine and diisocyanate makes it difficult to prepare PUUA. Herein, we put forward a simple method to synthesize PUUA, which was then used to prepare UV-cured PUUA coatings with simultaneous high hardness and excellent toughness. In our strategy, a novel diol containing urea group has been designed, which was employed as chain extender to synthesize PUUA at a controllable polymerization rate. By adopting chain extenders with different molecular structures, two kinds of PUUA were synthesized. The molecular structures of diol containing urea group and PUUA were identified by Fourier transform infrared spectroscopy (FTIR) and Nuclear magnetic resonance spectroscopy ( 1 H NMR). Benefiting from the strong urea-based H-bond, the UV-cured PUUA films showed simultaneously enhanced mechanical strength and toughness. Specially, the optimal PUUA film exhibited high mechanical strength (19 MPa), high elongation at break (310 %), and high toughness (26.9 MJ m −3 ), which was 9.5, 2.8 and 19.2-fold increase compared with polyurethane acrylate (PUA) film without urea groups. Correspondingly, the UV-cured PUUA coatings exhibited higher impact resistance and higher hardness than PUA coating. This work provides a new avenue to develop PUUA for high-performance UV-curable coatings.
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 Chemistry C
·
2023
·Vol. 11
·期 36
·12261-12269
·
IF 6.4
Ying-Jie Ma,Jing-Wen Wang,Guo-Chao Zhuang,Yang Zhang,Zi-Long Zhang,Ming-Yue Zhang,Guang-Bin Ji
To overcome the effect of high actuation voltages causing dielectric elastomer films to breakdown, fabricating films with excellent dielectric properties and high durability is the current focus. Previously reported dielectric elastomer films, nevertheless, still require better dielectric properties and suffer from a lack of self-healing properties, which reduces the service life of the films. In this work, polysulfide polyurethane–urea (PSPU) elastomers with self-healing properties were synthesized through the insertion of dynamic disulfide bonds into the polymer chain segments via hydrogen transfer reactions. In addition, PSPU-based composites were fabricated in which the filler was MXene loaded with CeO2 obtained using a hydrothermal method. Benefiting from dynamic disulfide bonding and multiple hydrogen bonding interactions, PSPU attained a self-healing efficiency of 95%. Moreover, the 5.25 vol% CeO2@MXene/PSPU composite exhibited a dielectric constant of 206 at 100 Hz, maintaining a loss of 0.19 while having a self-healing efficiency of 97.9%. In contrast to PSPU, the dielectric constant of 5.25 vol% CeO2@MXene/PSPU was 34 times higher than that of the former at 100 Hz. These distinctive properties promise to render the films an integral part of the actuator.
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
Nano Materials Science
·
2024
·
IF 12.6
Qingshi Meng,Zhaoyang Xu,Yin Yu,Yikuan Li,Abdullatif Lacina Diaby,Sherif Araby
In this study, a facile method was employed to synthesize strong, yet highly elastic polyurethane-urea (PUU) with typical characteristics and 94 % optical transmittance. Graphene platelets (GNPs) were prepared and modified via a scalable and eco-friendly mechanochemical approach. The produced GNPs is at 1.6-nm thickness with high electrical conductivity of ∼950 S/m. The structure-property relations of PUU/GNP nanocomposites were comprehensively investigated through morphology and mechanical properties measurements. The strong interface and high-density hydrogen bonds between modified GNPs (M-GNPs) and PUU significantly enhanced the mechanical properties of the PUU nanocomposite. The PUU composite showed 66.7 % and 36.2 % increments in tensile and impact strengths, respectively, at 0.2 wt% M-GNPs. The reversible hydrogen bond between M-GNPs and PUU endowed the nanocomposite with self-healing properties achieving 97.8 % healing efficiency of the strength after 5 h at 120 °C. This study demonstrates the importance of surface modification and provides a simple yet robust approach for preparing high-performance and functional PUU/graphene composites.
研究领域:
材料科学
·
复合材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2021
·
IF 2.161
Yong Sun,Anqi Yu,Yuntao Liang,Gang Wang,Shuanglin Song,Wei Lu,Zhenglong He,Shaocong Meng
In order to understand the evolution of the structure–property relationship between the crosslink density and mechanical properties of polyurethane-urea/sodium silicate (PU/SS) hybrid composites, a series of PU/SS composites with 2.5 wt% organofunctional silanes and pure PU/SS composites are investigated at different curing time. Mechanical properties, the fracture surface morphology, and thermo-mechanical properties of these PU/SS composites are characterized by electron omnipotence experiment machine, scanning electron microscope, and dynamic mechanical analysis (DMA), respectively. The mechanical test results show the strength and fracture toughness of the PU/SS composites first increase and then stabilize during cure, and the modification leads to PU/SS composites with significantly higher mechanical properties. Further, the morphology of fractured samples also reveals that the longer curing time and the modification of the PU/SS composites means a higher curing degree. Moreover, the increase in the crosslink density calculated from the DMA tests quantitatively confirmed the positive influence of the curing time and the modification in enhancing mechanical properties. In addition, it is also found that the mechanical properties of the PU/SS composites not only depend on the crosslink density but also on the well-dispersed hybrid PU/SS system.
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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yifei Zhang,Shuxin Xu,Jiarui Liu,Kaiyuan Zhang,Yu Guan,Shaoxiang Li
Developing high-performance polymer composites with self-healing and recyclable performance is crucial for long-term durability of the devices. This paper presents a novel method by incorporating carbon quantum dots (CQDs) into the chain extension reaction of polymers to construct self-healing polyurethane-urea (PUU) with excellent integrated mechanical and multi-recyclable properties. By the introduction of the CQDs with surface containing ample amide, carboxyl, and hydroxyl groups, the cross-linking networks are formed, and simultaneously, abundant H-bonds at the interface between CQDs nanospheres and PUU matrix provide strong interfacial interactions, which endows material reinforcement and self-healing effect. The addition of a very low amount of CQDs (0.15 wt%) can significantly improves the mechanical performance, especially the tensile stress and toughness, which increased about 74.4 % (35.2 MPa to 61.4 MPa) and 115.2 % (34.8 MJ·m −3 to 74.9 MJ·m −3 ), respectively. Besides, unlike other nanofillers, the addition of CQDs (more than 1 wt%) enables the PUU with excellent self-healing and recycling properties, and for 3 wt% addition, the room temperature self-healing efficiency can even achieve 97.0 % for 24 h without external intervention. Furthermore, the addition of the CQDs can also significantly the damping effect of the polymers. It is highly anticipated that the research will provide a facile method to construct high performance polymer materials.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 88
·55610-55619
·
IF 3.108
Dong Xiang,Miao Liu,Guanliang Chen,Teng Zhang,Li Liu,Yongri Liang
In this work, we fabricated novel poly(urethane–urea) (PUU)-based dielectric elastomers using a hydroxyl-terminated butadiene–acrylonitrile copolymer (HTBN) as the soft segment and hexamethylene diisocyanate (HDI) and 3,3′-dimethyl-4,4′-diamino dicyclohexyl methane (DMDC) as hard segments. The effect of hard segment (HS) content on the hard domain (HD) structure, morphology, dielectric and mechanical properties was investigated with Fourier transform infrared spectroscopy (FTIR), small/wide angle X-ray scattering (SAXS/WAXS), broadband dielectric spectroscopy and mechanical testing methods. Our results indicated that the hard domain structure units of PUUs such as degree of hydrogen bonding, size and crystallinity played an important role in the dielectric and mechanical properties. The dielectric constant of PUUs was significantly decreased with increasing HS content, whereas the breakdown strength and Young's modulus of PUUs were significantly increased. The relationship between multi-length scale structure and dielectric constant and breakdown strength properties of PUUEs were discussed. Our results can provide a new insight for optimization of dielectric and mechanical properties of PUU-based dielectric elastomers.
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
RSC Advances
·
2016
·Vol. 6
·期 105
·102997-103005
·
IF 3.289
Changzhong Chen,Wenmin Liu,Hongwei Wang,Lanlan Zhu
A series of novel polymeric solid–solid phase change materials (SSPCMs) with polyurethaneurea (PUU) copolymer structure were synthesized by the crosslinking copolymerization of polyethylene glycol (PEG) and multiamino compounds (diethylenetriamine, triethylenetetramine, tetraethylenepentamine) with different molar ratios. The results from the polarization optical microscopy (POM) and WAXD patterns indicate that the SSPCMs have typical spherocrystal morphology and characteristic diffraction peaks like neat PEG, but their spherulite size and diffraction peak intensity are smaller than those of PEG. According to the thermal analyses, the SSPCMs possess high phase transition enthalpies, good reusability and high thermal stability for their potential applications in thermal energy storage. With the decrease of crosslinking density of SSPCMs, the crystalline properties and thermal properties of SSPCMs have improved apparently, which is closely related to the free movement of PEG segments in the SSPCMs.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Lin Gu,Yuanzhang Jiang,Larry M.C. Chow,Zhen Liu,Wei Gao,Yanting Han,Cong Wang,Jinlian Hu
Spiders can produce different types of silks with different functions by tuning the hierarchical structure of spidroin. Inspired by the secondary structure of spider silk, a series of peptide-polyurethane/urea (PUU) hybrids with various peptide contents were synthesized in this work. By effective control of polymerization degree, simultaneous presence of α -helixes and β -sheets in the polymer was realized. The modulus of films increased with peptide loading and reached more than 200 MPa at 71.1% peptide content. Notably, the PUU hybrid with 41.5% peptide content (P-41.5) showed the highest tensile strength (6.6 MPa) and strain (1238%). At the same time, this film (P-41.5) exhibited shape memory effect at 37 °C, as well as excellent shape recovery ratio during successive cycles at 100% strain. Furthermore, Ag nanowires/P-41.5 hybrid film exhibited superb electric resistance stability under bending and stretching conditions, making it a promising material for strain sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 18
·期 12
·3614-3619
·
IF 8.506
Zhong Ying,Chaoyong Wu,Shan Jiang,Ruhui Shi,Bin Zhang,Chao Zhang,Fengyu Zhao
A series of thermoplastic polyurethane-ureas were synthesized from a soft segment of a polycarbonate diol and a hard segment of an oligourea, and both the segments were derived from the CO2-route. The chemical structure of the synthesized segments and final polyurethane-ureas were identified by FT-IR and 13C-NMR. The average molecular weight of the oligourea was detected by potentiometric titration, MALDI-TOF and GPC. The Mn and Mw of the final polyurethane-ureas were nearly 0.7 × 104 Da and 1.0 × 104 Da, respectively, within a polydispersity index (PDI) of 1.27–1.44. Moreover, the X-ray diffraction (XRD) results showed that the as-synthesized polyurethane-ureas were amorphous and presented moderate thermo-stable properties with an initial decomposition temperature higher than 170 °C and a maximum decomposition temperature around 250 °C as examined by TGA. Furthermore, the amorphous polyurethane-ureas have a good solubility in some traditional organic solvents because the siloxane and carbonate groups were introduced into the main chain. The present novel polyurethane-urea, which possesses a high flexibility and fine compatibility with other polymeric materials, will have a wide application as a macromolecular plasticizer in plastic 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
危险品化学品经营许可证（带存储）