Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2021
·
IF 2.168
Tingting Liao,Jianyu Wu,Zilun Tang,Qiuping Su,Zhiyi Huang,Yuxin Gu,Yong Li,Jing Xie,Xiaofeng Lin,Guobin Yi
Herein, benefiting from effective energy-dissipation mechanism, the high-performance thermoplastic elastomers (ZASM/SEBS composites) with excellent mechanical strength-toughness combination were prepared by blending 3-Amino-1,2,4-triazole (ATA), maleic anhydride grafted styrene-ethylene/butadiene-styrene triblock copolymer (SEBS-g-MA), zinc acetate and styrene-ethylene/butadiene-styrene triblock copolymer (SEBS) successively. The Zn2+-carboxyl coordination and hydrogen bonding dual-dynamic network of composites was proved by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The mechanical performance of ZASM/SEBS composites was investigated by tensile test. With the decreasing mass ratio of ZASM in ZASM/SEBS composites, the tensile strength and elongation at break increased firstly and then decreased. When the mass ratio of ZASM in composites was 30%, the tensile strength reached 32.1 MPa along with the elongation at break of 1383%, attaining the best mechanical strength-toughness combination. It is demonstrated that the ZASM/SEBS composites could be a promising substitute for traditional vulcanized rubber.
研究领域:
材料科学
·
高分子科学
·
力学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Le Cheng,Jiachun Feng
With the progress of intelligent electronic equipment, flexible and wearable strain sensors are being widely used in various applications such as electronic skins and smart robot. In this work, we proposed a facile method for the preparation of stretchable strain sensors as well as compressible strain sensors by using commercially available melamine form (MF). Firstly, MF was coated with reduced graphene oxide (rGO) to construct conductive networks via layer-by-layer assembly of polyethyleneimine and graphene oxide followed by chemical reduction. Thermoplastic elastomer poly (styrene- b -ethylene-butylene- b -styrene) (SEBS) was then infused into the MF@rGO scaffolds through solution absorption method. By adjusting the concentration of SEBS solution used, stretchable and compressible strain sensors were fabricated and both of them exhibited excellent mechanical properties, sensitive responsiveness and electromechanical durability. The deformation capacity of these two types of sensors could reach as high as 50% strain and the maximum gauge factors of stretchable and compressible strain sensors was 2.43 and 1.74, respectively. Stable signals during at least 1000 cycles for both stretchable and compressible strain sensors were well maintained. The potential sensing application of real-time monitoring of human motions was also demonstrated.
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
·
2023
·Vol. 140
·期 47
·e54711
·
IF 3
Yin Zhang,Yu Wang,Wei You
Based on derivatization of commercial poly(ethylene- co -vinyl acetate) (EVA), novel macromolecular UV-absorbers with polyethylene (PE) backbones and ferrocene side groups are presented in this study. The structures and properties of the polymers were analyzed using various techniques including Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance ( 1 H NMR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscope (SEM), and UV visible absorption spectroscopy. UV analysis experiments have shown that PE-grafted ferrocenyl ester (PE- g -FE) and PE-grafted azacyclo-ferrocene (PE- g -AF) with ferrocene side groups have the potential to act as UV absorbers. By using the polymers as additives for commercial PE, the anti-migration experiment demonstrates that PE- g -AF, with a heterocyclic structure, exhibits superior anti-migration performance than the ester-linked PE- g -FE. Furthermore, in comparison to commercial small-molecular UV absorbers (UV-329), the PE- g -AF absorber not only exhibits better UV absorption performance but also demonstrates almost zero migration behavior within the PE matrix.
研究领域:
材料科学
·
高分子化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
Huan Dong,Miao Luo,Sheng Wang,Xiang Ma
A series of new diarylethene compounds with both photochromism and aggregation-induced emission have been synthesized by connecting tetraphenylethene and triphenylethene to the bisthienylethene. All the four compounds exhibit good photochromism upon irradiation with alternative UV and visible light. And they are all provided with aggregation-induced emission properties in tetrahydrofuran solution with different fraction of water, non-emissive in the pure tetrahydrofuran solution but yellowish green fluorescence in the aggregate or solid state. Furthermore, the compounds connecting tetraphenylethene to the bisthienylethene were found to exhibit the stronger fluorescence emission in the aggregate or solid state than the ones connecting triphenylethene to the bisthienylethene.
研究领域:
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2023
·Vol. 17
·期 3
·1-13
·
IF 2.7
Bo Ruitian,Wang Chunfeng,Wang Yongliang,He Peigang,Han Zhidong
The layer-structured composites were built by the dielectric and insulating layers composed of polyvinylidene fluoride (PVDF) and low-density polyethylene (LDPE) composites containing barium titanate (BT) to modulate the dielectric and energy storage properties of the composites. The simulations on the interface models for molecular dynamics and the geometric models for finite element analysis were performed together with the experimental characterization of the morphology, dielectric, and energy storage properties of the composites. The results revealed that polyethylene as an insulating layer played a successful role in modulating dielectric permittivity and breakdown strength while BT particles exerted positive effects in improving the miscibility between the composed layers and redistributing the electric field. The strong interface binding energy and the similar dielectric permittivity between the PVDF layer and the BT20/LDPE layer made for the layer-structured composites with a characteristic breakdown strength ( E b ) of 188.9 kV·mm −1 , a discharge energy density ( U d ) of 1.42 J·cm −3 , and a dielectric loss factor (tan δ ) of 0.017, which were increased by 94%, 141%, and decreased by 54% in comparison with those of the BT20/PVDF composite, respectively.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2013
·Vol. 46
·期 34
·345303
·
IF 2.528
Pan Wang,Han Zhu,Shiyong Bao,MingLiang Du,Ming Zhang
Two strategies are demonstrated to fabricate AgNPs/PVA and AgNPs/(PVA/PEI) nanofibre hybrids. In the first approach, we synthesized AgNPs in poly(vinylalcohol) (PVA) solution and then electrospun the AgNPs/PVA solution into the AgNPs/PVA nanofibres. In the other one, the polyethylenimine (PEI) was introduced to improve the water-stability of PVA and then the AgNPs were immobilized on electrospun PVA/PEI nanofibres to fabricate the AgNPs/(PVA/PEI) nanofibres. Field-emission scanning electron microscopy, transmission electron microscopy, ultraviolet–visible spectroscopy and x-ray photoelectron spectroscopy (XPS) were utilized to investigate the morphology and the growth mechanism of the hybrids. The investigations demonstrate that both of the obtained AgNPs/PVA hybrids and AgNPs/(PVA/PEI) hybrids exhibit good water-stability and good antibacterial activity against E. coli and S. aureus.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Shaoliang Zhu,Bingtao Zhao,Yaxin Su
High-efficiency and cost-effective adsorbents are crucial to dry capture of carbon dioxide (CO 2 ). The polyethyleneimine (PEI) was co-impregnated with tetraethylenepentamine (TEPA) on γ-alumina (Al 2 O 3 ) to synthesize the adsorbent and enhance the capture process. The influence of amine loading and operating parameters on CO 2 adsorption was investigated, and the process parameters were modeled. The results depict that the optimal loading is 50 % when functionalized either PEI or TEPA individually, which is 3.7 and 4.6 times higher than γ–Al 2 O 3 . The CO 2 capacity of γ–Al 2 O 3 functionalized with multiple amines (30 %PEI+20 %TEPA) is 2.65 mmol/g, due to the synergies of the two amines to increase the chance of CO 2 binding to the sites. Regeneration performance illustrates that the adsorbent remains at 90.2 % of the initial capacity after seven tests. The maximal capacity of 2.70 mmol/g occurs at 70 °C. Modeling results indicate the kinetics can be evaluated by the Avrami model (R 2 > 0.990) with the activation energy of 5.65 kJ/mol. The process is controlled by physical–chemical adsorption, influenced by intraparticle diffusion, as described by the deactivation model. Finally, a comparison and assessment were conducted for their techno-economic performances, and the pathway to applications was also proposed in engineering practice.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Wufei Tang,Huimin Zhang,Ting Liu,Xinle Li,Hua Yang,Weizhen Huang,Yunhui Liao,Xiaoyu Gu,Sheng Zhang
Ethylene vinyl acetate copolymer (EVA) is widely applied in many important fields, but its broader utility is impeded by its flammability . To address this problem, the pre-acidified kaolinite (AKaol) by sulfuric acid was further dealt with TiO 2 loading and Zn 2+ doping to obtain Zn/TiO 2 @AKaol to improve the flame retardancy and smoke suppression of EVA composites containing intumescent flame retardants (IFR) typically. The results showed that the addition of 1 wt% Zn/TiO 2 @AKaol improved the flame retardancy and reduced the smoke release of EVA/IFR composite. The limiting oxygen index (LOI) value of the EVA/IFR composite containing Zn/TiO 2 @AKaol increased to 32.7 % from 27.3 % of EVA/IFR composite. In the cone calorimeter test (CCT), the peak heat release rate (pHRR) and total heat release (THR) values were reduced to 297.5 kW/m 2 and 98.8 MJ/m 2 from the 409.9 kW/m 2 and 109.3 MJ/m 2 of EVA/IFR composite, respectively. Meanwhile, the values of total smoke production (TSP) in the CCT and smoke density tests in building materials were reduced to 13.5 m 2 and 33.39 % of EVA/IFR/Zn/TiO 2 @AKaol composite from 18.4 m 2 and 63.91 % of EVA/IFR composite, respectively. Based on the mechanism analysis, it was proposed that Zn/TiO 2 @AKaol not only promoted the production of P· in advance, but also increased a cross-linked structure char in the condensed phase to achieve flame retardancy and smoke suppression of EVA composites.
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 BIOMATERIALS SCIENCE-POLYMER EDITION
·
2024
·
IF 3.6
Min Xiao,Zifeng Wang,Yanru An,Yingqi Dai,Xinghao Wang,Zhigang Zhu
Microneedles offer minimally invasive, user-friendly, and subcutaneously accessible transdermal drug delivery and have been widely investigated as an effective transdermal delivery system. Ibuprofen is a common anti-inflammatory drug to treat chronic inflammation. It is crucial to develop microneedle patches capable of efficiently delivering ibuprofen through the skin for the effective treatment of arthritis patients requiring repeated medication. In this study, the mechanical properties of a new type of polymer microneedle were studied by finite element analysis, and the experimental results showed that the microneedle could effectively deliver drugs through the skin. In addition, a high ibuprofen-loaded microneedle patch was successfully prepared by micromolding and subjected to evaluation of its infrared spectrum morphology and dissolve degree. The morphology of microneedles was characterized by scanning electron microscopy, and the mechanical properties were assessed using a built linear stretching system. In the in-vitro diffusion cell drug release test, the microneedle released 85.2 ± 1.52% (210 ± 3.7 μg) ibuprofen in the modified Franz diffusion within 4 h, exhibiting a higher drug release compared to other drug delivery methods. This study provides a portable, safe and efficient treatment approach for arthritis patients requiring daily repeated medication.
研究领域:
药剂学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Weihua Meng,Hongjuan Wu,Ruifang Wu,Tian Wang,Aiqing Wang,Jing Ma,Jianzhong Xu,Hongqiang Qu
A novel magnesium hydroxide-polyphosphazene-Ni 2+ (MH-PZPN-Ni) was synthesized by the layer-by-layer assembly strategy and Ni 2+ chelation method. Post modification, the composite was incorporated into ethylene-vinyl acetate (EVA). The morphology, composition and structure of the MH-PZPN-Ni composites were comprehensively characterized by scanning electron microscopy, transmission electron microscope, Fourier transform infrared, X-ray diffraction and X-ray photoelectron spectroscopy. MH-PZPN-Ni could efficiently increase the flame retardancy and smoke suppression of EVA. The MH-PZPN-Ni (60 wt %)-incorporated EVA composite showed a limiting oxygen index value of 30.4 % and was rated as a UL 94 V-0 material. Cone calorimeter test results showed that the peak heat release rate and total heat release of EVA/MH-PZPN-Ni were decreased by 85.8 % and 56.7 %, respectively when compared to pure EVA. The morphology, structure, and chemical composition of the char residue and the pyrolysis products formed during the decomposition of the EVA composites were analyzed to investigate the flame-retardant mechanism of the modified EVA matrix. The production of ammonia (during the process of PZPN-Ni decay) and the water vapor formed due to the combustion of the H· and OH· radicals were found to dilute the concentration of the generated combustible gases. The denser char layer effectively blocked the heat and mass transfer. At the same time, the use of the Ni catalyst resulted in a significantly low production of various volatile products (such as CO and aliphatic and aromatic compounds). Moreover, PZPN-Ni enhanced the mechanical properties of EVA. The elongation at break increased by 74.9 %.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2020
·
IF 0
Huishi Pi,Weiping Li,Zhiwei Shi,Haining Chen,Xiaoyu Jiang
Based on the poly(vinyl alcohol) (PVA) system, photopolymers were prepared with two different monomers: N-vinylpyrrolidone (NVP) and acrylamide (AM). The maximum diffraction efficiency of the photopolymers was more than 85%, and the maximum sensitivity was 17.77 × 10–3 cm2/mJ. The optimized photopolymer with high diffraction efficiency and high photosensitivity can achieve both the recording and reproduction of reflection holography and the recording and reproduction of transmission holography. At the same time, the effects of monomer on holographic properties of photopolymers were studied. It was found that the reactivity and migration rate of the monomer worked together on the polymerization rate, which affected the holographic properties of the photopolymer. To verify the influence of the structure of NVP and AM on the reactivity and migration rate, the transmittance and the real-time diffraction efficiency measurements were innovatively used. The NVP with high electron cloud density was more reactive, while the AM with low molecular weight and simple molecular structure had a faster migration rate.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
SN Applied Sciences
·
2019
·Vol. 1
·期 7
·1-12
·
IF 0
Wang Lu,Dai Shanshan,Liu Xuewei,Wang Xuerui,Lu Hongsheng
The preparation of composite nanofibers often can make up for the shortage of single materials in the field of oil–water separation, including separation efficiency, mechanical properties and fine flexibility. The film materials prepared by doping inorganic nanoparticles have defects of poor stability and uneven dispersion of the fiber surface. In this paper, we prepared a novel polyvinylidene fluoride (PVDF) -polystyrene (PS) -cellulose acetate (CA) ternary mixture system membrane by electrospinning. Nanosized polystyrene in the spinning process uniformly gathers on the fiber surface by interlacing PVDF and CA to manipulate the microstructure of the fiber surface. PVDF is added to increase mechanical properties. Degradable CA is selected to promote pore formation and compatibility between the other two polymers. The composite membrane has high separation efficiency, high oil flux and superior mechanical properties as demonstrated by oil/water separation test and stress–strain test. The optimized oil flux reaches 1935.67 L h −1 m −2 only driven by gravity of 0.73 kPa. Due to low energy consumption, excellent separation and more flexible regulation, this membrane may have great application value in industrial oil–water separation in the future.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）