MATERIALS & DESIGN
·
2016
·
IF 3.997
Qiong Tian,Demei Yu
Interfacial adhesion between fillers and matrix is important to the properties of their composites. In this study, hollow and solid polymer microspheres/epoxy composite films were prepared via powder mixing method and UV-curable polymerization. Interfacial adhesion was established by chemical bonding among the epoxy groups of the microspheres and epoxy matrix . The tensile strength and modulus of polymer microspheres/epoxy composite films first increased and then decreased with increasing the content of fillers. The specific tensile strength and modulus of hollow microspheres/epoxy composites were higher than those of solid microspheres/epoxy composites. The fracture mode of the composite films changed from crack of the polymer microspheres to interfacial debonding with increasing the filler's content . Characteristics of shear yielding deformation, particle bridging and crack bowing mechanisms were identified from the microscopic image of tensile fracture surfaces . The improvement of tensile properties compared with neat epoxy resin was discussed on the basis of percolation mechanism. The hollow polymer microspheres/epoxy syntactic foam films retained high electrical resistivity and UV-shielding property. The UV-curable hollow polymer microspheres/epoxy syntactic foam films with good strength could be used as electrical insulating materials.
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 APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 45
·e53122
·
IF 3.057
Xuedong Lv,Faliang Luo,Liuchun Zheng,Ruixue Niu,Yi Liu,Qiqi Xie,DanQing Song,YunChuan Zhang,Tianbo Zhou,Shifan Zhu
Biobased co-polyesters poly(butylene succinate-co-butylene furandicarboxylate) (PBSF) is prepared by transesterification and polycondensation of dimethyl succinate (DSMu), dimethyl 2,5-furandicarboxylate (MDFD) and 1,4-butanediol (1,4-BDO). GPC analysis shows that PBSF has high molecular weight with weight average molecular weight ( M w ) up to 11 × 10 4 g/mol. Due to the low -COOH content, PBSF also has excellent thermal stability, which is beneficial to the polyester processing. Differential scanning calorimetry (DSC) analysis shows that PBSF are semi-crystalline materials, with T m ranging from 116 to 101°C. Tensile tests showed that theses polymers possess high tensile strength (30–22 MPa) and elongation at break as high as 562%, which is prominently higher than that of commercial poly(butylene succinate) (PBS) and most biodegradable packaging materials. It should be noted that the increase of BF units improves the UV shielding properties of polyester materials. Moreover, the incorporation of furan ring promoted the enzymatic degradation of PBS, and PBSF showed a significantly faster biodegradation rate when the BF unit content is 5%. PBSF polyester has excellent thermal properties, tensile properties, UV shielding properties and biodegradable properties. Therefore, these new bio-based polymers have great potential to be applied as environmentally friendly and sustainable plastic packaging.
研究领域:
材料科学
·
环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Wanli Zhao,Yuanhui Long,Yunqing He,Jiabing Cai,Mingxian Liu
Highly stretchable hydrogel shows great potential for wearable strain sensors. However, the rapid propagation of bacteria while using wearable sensors may threaten health. In this work, HNTs@HKUST-1 composites were prepared by the incorporation of halloysite nanotubes (HNTs) during the synthesis of HKUST-1. HNTs depressed the crystal growth of the HKUST-1, which leads to the 2D nanosheet morphology. HNTs@HKUST-1 serves as a reinforcing agent for polyacrylamide (PAAm) hydrogels, and PAAm-HNTs@HKUST-1 has high tensile strain properties (elongation at break of 912.5% and tensile strength of 22.4 kPa). The Cu 2+ in HKUST-1 endows remarkable conductivity and excellent antibacterial properties to the composite. The composite hydrogels were then developed as human motion detection sensors with antibacterial property to prevent microbial infection, which show recyclability, high sensitivity, and fast responsiveness. So, they have great potential as flexible antibacterial materials to monitor movements of the human body in real-time.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 5
·49767
·
IF 2.52
Chengtian Xiong,Xiaoqing Li,Hezhi He,Bin Xue,Yi Wang,Jiqian Li,Zhiwen Zhu
Due to the disadvantages of lower tensile strength and fracture toughness, the widely application of Ethylene-propylene-diene-monomer rubber (EPDM) has been limited. In this study, a thermally reversible healing EPDM based elastomer with H-bonding and Zn-based-bonding dynamic cross-link network was prepared. The influence of mole ratio of ATA/MAH on tensile strength and fracture energy of mEPDM 0 -xATA was investigated. The results showed that increasing the content of ATA brings about a gradual improvement in tensile strength of the mEPDM 0 -xATA. Especially when the mole ratio of ATA/MAH is 1, the fracture energy of mEPDM 0 -ATA is dramatically enhanced to 33.9 MJ/m 3 , which is best among the ratios studied in our research. After curing, the effect of ZnCl 2 content on tensile strength and fracture energy of mEPDM-ATA-nZn was also studied. Meanwhile, the uniaxial cyclic loading-unloading tensile test was used to study the viscous damping properties of mEPDM-ATA-0.4Zn, which showed reversible repair properties after heat treatment. The results of dynamic rheological measurement showed that the damping properties were improved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yueshan Li,Da Li,Weihao Yuan,Yibo Shen,Zhen Hu
Conventional epoxy resins have high cross-linking density and rigid molecular structures, which make them difficult to develop into flexible elastomers. Here, inspired by the cuticle of the marine mussel byssi, we incorporate reversible Fe3+–carboxyl cross-links into a cross-linked epoxy network through a transformation between chemical cross-links and physical cross-links to realize the construction of a dynamic cross-linked network in traditional epoxy resins. Dynamic cross-linking networks and long flexible chain segments endow the epoxy system with excellent stretchable properties. Carbon nanotubes coated with ferric oxide (Fe3O4) nanoparticles were synthesized and added to the epoxy system, reinforcing the epoxy system. The synergistic combination of the modified molecular structure and nanohybrid endows the epoxy system with 550% elongation at break, a tensile strength of 1.4 MPa, and the ability to respond quickly to an applied magnetic field. An ultrasensitive strain sensor was constructed from synthetic epoxy hybrid materials; the GF (strain coefficient) of the strain sensor was up to 344.32. This research will be beneficial in expanding the application range of traditional epoxy polymer materials in the emerging sensor field.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
·
2024
·
IF 1.7
Ying Qin,GuanKun Kuang,TianHao Lu,Yan Liu,BinJie Xin
Polyurethane acrylates (PUA) are commonly used as leather finishing agents because of their excellent film-forming, mechanical and abrasion resistance properties. In this study, silicone-modified polyether-based waterborne polyurethane acrylate (WPUA) was synthesized as an environmentally friendly leather finishing agent. The effects of different soft segments on the properties of WPUA were investigated by tensile strength, water absorption, thermogravimetry (TG), derivative thermogravimetry (DTG), and water contact angle tests. The results showed that the WPUA synthesized with PTMG 2000 as the soft segment had higher elongation at break, lower water absorption, and a larger water contact angle. The effect of different mass percentages of silicone on the properties ofpolytetramethylene oxide (WPUA) was investigated by scanning electron microscope (SEM), particle size, zeta potential, Fourier transform infrared spectroscopy (FT-IR), water contact angle, folding resistance, and mechanical properties. It was found that the hydrophobic, tensile, and folding resistance properties of the waterborne leather finishing agent were best when the silicone content was 5 wt%. What’s more, the synthesized silicone-modified polyether-type waterborne polyurethanes, with excellent comprehensive performance, have great potential for industrial application in leather finishing agents.
研究领域:
材料科学
·
皮革化学与工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 11
·10360-10368
·
IF 2.195
Zhao Yongke,Zhou Manxi,Chen Guangxin,Zhou Zheng,Li Qifang
Low-dielectric polymer composites with high mechanical and thermal properties are very promising for microelectronic devices application. In this paper, chloride salt of octa (aminopropylsilsesquioxane) was prepared successfully and then was grafted onto silane modified boron nitride (BN). The hybrids were used to prepare epoxy-based composites and the dielectric, thermal and tensile properties of the composites were studied. Results revealed that the dielectric constant and dielectric loss values of the epoxy composites were decreased, and the AC resistivity was increased by adding only 0.6 wt% of the hybrids. Moreover, the epoxy composite exhibited improved thermal stability and higher glass transition temperature compared with the pure epoxy. The tensile strength, tensile modulus, and elongation at break of the epoxy composites were increased by 19.7%, 15.5%, and 69.7% compared with that of pure epoxy, respectively, when the hybrids loading was 0.6 wt%. These results indicated that hybridization of polyhedral oligomeric silsesquioxane and BN was beneficial to take their advantages for preparing high performance low-dielectric epoxy composites.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 4
·47004
·
IF 1.901
Yanqin Shi,Yating Wang,Biao Ma,Meng Ma,Si Chen,Xu Wang
Two novel thermal stabilizers, zinc and calcium oxolinic complexes (Zn(Oxo) 2 and Ca(Oxo) 2 ), with superior tensile properties and notable thermal stability effect for polyvinyl chloride (PVC) are reported here. The complexes are synthesized without any organic solvents, and the structures are confirmed as Zn(C 13 H 10 NO 5 ) 2 ·H 2 O and Ca(C 13 H 10 NO 5 ) 2 ·3H 2 O by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray fluorescence spectrometry, and elemental analysis. The PVC samples stabilized with the complexes show superior tensile strength and elongation at break compared with zinc and calcium stearates by tensile test. The results of Congo red test, dehydrochlorination test, and discoloration test show that: (1) Zn(Oxo) 2 is better than zinc stearate as thermal stabilizer for PVC; (2) Zn(Oxo) 2 and Ca(Oxo) 2 show notable synergistic effect with calcium stearate and zinc norfloxacin respectively. The mechanism of the superior tensile properties and notable thermal stability effect is due to the ability of the complexes to absorbing HCl and reacting with PVC chains, which result in the special chain extension of PVC and the delay of autocatalytic effect and zipper-like dehydrochlorination. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47004.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Feng Ye,Si Chen,GuoDong Tang,Meng Ma,Xu Wang
Tough and transparent poly(methyl methacrylate) (PMMA) nanocomposites with the impact strength and breaking elongation 1.6 and 9.6 times higher than that of pure PMMA, separately, are obtained through in situ thermal polymerization of methylmethacrylate (MMA) gels with dumbbell-like organogelators (G1-alkyl). G1-alkyl is designed and synthesized with long alkyl chains at the periphery, which can self-assemble into three-dimensional (3D) nanofibrillar gel networks in MMA monomers during the gelation process. PMMA nanocomposites are obtained through in situ thermal polymerization of MMA gels, whose gel networks are well-dispersed in polymer matrix because of the good compatibility and survived after the polymerization process, verified by SEM studies. Mechanical analysis indicates that only a small amount of gelator addition can significantly improve the mechanical properties of the obtained nanocomposites, and the maximum value of impact strength and breaking elongation is achieved with 1.0 wt% gelator concentration. In particular, UV–vis spectrophotometer and Archimedes drainage method indicates the PMMA nanocomposites maintain the advantage of good optical transparency and lightweight.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ming Zhu,Tao Yang,Liting Wang,Mengyuan Xiong,Wenjun He,Yaowei Chen,Weili Deng,Xiaoyan Li
Stretchable electronics have attracted great interest due to their mechanical flexibility similar to tissues. In this paper, a superstretchable fiber membrane is designed based on step by step assembly of electrospun poly(styrene-ethylene/butylene-styrene) (SEBS), carbon nanotubes (CNTs) and electropolymerized polyaniline (PANi). The prepared soft membrane has a hierarchical micro-nano structure, forms a good interface with the triblock copolymer fiber, and shows good electromechanical performance. The electrical conductivity of the membrane is about 2.40 S·cm −1 , the tensile strength and the maximum tensile strain can reach 8.2 MPa and 1200% respectively, while the Young’s modulus is only about 0.26 MPa. The conductivity of the prepared membrane remains stable after 1000 cycles, and the fractured composite membrane can be healed by hot pressing. In addition, this stretchable composite membrane has been successfully demonstrated to detect various human motions, and can even work underwater. Our results provide a simple and controllable method to achieve the stable soft stretchable electronics with large strain, and demonstrate promising potential in the expanded application of human motion monitoring.
研究领域:
材料科学
·
电子工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Kan Liu,Yishi Su,Xiaozhen Wang,Yunpeng Cai,He Cao,Qiubao Ouyang,Di Zhang
The incorporation of micro- and nano-sized SiC particles (micro- & nano-SiCps) into Al matrix constituted the micro- & nano-SiCp/Al composites through powder metallurgy . A unique ultrafine-grained (UFG) microstructure with micro-SiCps distributed among Al grains and most of nano-SiCps dispersed in grain interiors is characterized. Based on this, the synergetic constraint of dual-scale reinforcements on deformation of Al matrix is employed to enhance dislocation accumulation through increased SiCp/Al interface area and Orowan pinning effect, resulting in an improved strain hardening capacity. Compared with 10 vol% micro-SiCp/Al composites, the composites with 1 vol% nano-SiCps and 9 vol% micro-SiCps exhibit notable tensile properties of 285 MPa in yield strength , 374.7 MPa in ultimate strength and 11.3% in total elongation, increased by 32.6%, 28.7% and 37.8%, respectively, while remain a comparable Young's modulus of 94.6 GPa. Theoretical analysis proves that the dominant strengthening mechanism in micro- & nano-SiCp/Al composites is dislocation strengthening, different from the load transfer in individual micro-SiCp/Al composites. Our work provides inspirations for fabricating high-modulus Al matrix composites with simultaneously enhanced strength and ductility.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 16
·165603
·
IF 3.953
Yongqin Hu,Chen Hou,Yuxia Shi,Jiamei Wu,Da Yang,Zhuili Huang,Yan Wang,Yufei Liu
Electromagnetic pollution seriously affects the human reproductive system, cardiovascular system, people's visual system, and so on. A novel versatile stretchable and biocompatible electromagnetic interference (EMI) shielding film has been developed, which could effectively attenuate electromagnetic radiation. The EMI shielding film was fabricated with a convenient solution casting and steam annealing with 2D MXene, iron oxide nanoparticles, and soluble polyurethane. The EMI shielding effectiveness is about 30.63 dB at 8.2 GHz, based on its discretized interfacial scattering and high energy conversion efficiency. Meanwhile, the excellent tensile elongation is 30.5%, because of the sliding migration and gradient structure of the nanomaterials doped in a polymer matrix. In addition, the film also demonstrated wonderful biocompatibility and did not cause erythema and discomfort even after being attached to the arm skin over 12 h, which shows the great potential for attenuation of electromagnetic irradiation and protection of human health.
研究领域:
材料科学
·
生物医学工程
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）