INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yadong Wang,Jingjing Gao,Li Ma,Hui Ge,Guoping Zhu,Zongmin Zhu
The preparation of flame-retardant high-performance polylactic acid (PLA) composites by adding green flame retardants have always been a challenge. In this work, an intumescent flame-retardant PCR based on phytic acid, chitosan, and resveratrol was successfully designed. Adding 4 wt% of PCR, the PLA-PCR composite was classified as UL-94 V-0 grade, with a LOI value increasing from 19.7 % (pure PLA) to 26.0 %, a peak heat release rate decreasing from 433 to 344 kW/m 2 . Owing to excellent compatibility of PCR, the mechanical strength and toughness of PLA-PCR composites have been improved, as reflected by a ~ 16 % increase in tensile strength, a ~ 73 % increase in impact strength and a ~ 57 % increase in toughness. In addition, PCR also presented plasticization effect on PLA, making it easier to process. This work provided a highly efficient and environmental-friendly modification approach for the development of multifunctional polymers.
研究领域:
材料科学
·
高分子化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 8
·1837
·
IF 5
Junchi Ma,Shihao Zhou,Yuanchang Lai,Zhaodi Wang,Nannan Ni,Feng Dai,Yahong Xu,Xin Yang
Metal–organic frameworks (MOFs) have been previously shown as an emerging modified class of epoxy resin. In this work, we report a simple strategy for preventing zeolitic imidazolate framework (ZIF-8) nanoparticles from agglomerating in epoxy resin (EP). Branched polyethylenimine grafted ZIF-8 in ionic liquid (BPEI-ZIF-8) nanofluid with good dispersion was prepared successfully using an ionic liquid as both the dispersant and curing agent. Results indicated that the thermogravimetric curve of the composite material had no noticeable change with increasing BPEI-ZIF-8/IL content. The glass transition temperature (Tg) of the epoxy composite was reduced with the addition of BPEI-ZIF-8/IL. The addition of 2 wt% BPEI-ZIF-8/IL into EP effectively improved the flexural strength to about 21.7%, and the inclusion of 0.5 wt% of BPEI-ZIF-8/IL EP composites increased the impact strength by about 83% compared to pure EP. The effect of adding BPEI-ZIF-8/IL on the Tgof epoxy resin was explored, and its toughening mechanism was analyzed in combination with SEM images showing fractures in the EP composites. Moreover, the damping and dielectric properties of the composites were improved by adding BPEI-ZIF-8/IL.Keywords:BPEI-ZIF-8/IL;epoxy composite;mechanical properties;thermal properties;damping properties;dielectric properties
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2022
·Vol. 28
·期 3
·459-473
·
IF 2.297
Xiangming Yang,Xiaoling Song,Yijing Wang,Erlei Yu,Zhong Wei
Bio-based phytic acid is a nontoxic naturally occurring compound and has the potential for use in polymers for flame retardancy due to its high phosphorus content. In this work, two novel phytic acid-based compounds, phytyl octyl glycidyl ether (PAOc) and phytyl phenyl glycidyl ether (PAPh), were prepared through the addition esterification of 2-ethylhexyl glycidyl ether and phenyl glycidyl ether with phytic acid. The chemical structure of PAOc and PAPh were confirmed by 1 H NMR, 31 P NMR, and FTIR spectra. The mechanical, thermal, and fire performances of the PLA/PAOc and PLA/PAPh blends were investigated by various tests including mechanical, thermal (DSC, TGA), morphological (SEM), and flammability (LOI, UL-94). The results showed that the addition of PAOc and PAPh improved the thermal stability of PLA through hydrogen bonding. PAPh was more effective to improving the mechanical properties and crystalline properties of PLA than PAOc. When PAPh was 5 wt%, the elongation at break of PLA increased from 2.9% to 16.7%, the tensile strength increased from 32 to 37 MPa, and the crystallinity increased from 30.6% to 36.7%. Moreover, introduction of phenyl group was beneficial to phytic acid improving the flame retardant properties of PLA. At an addition level of 10 wt%, the LOI of PLA/PAPh reached 27.5% and achieved UL-94-V0 rating while improving the mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 3
·339
·
IF 4.9
Yuwei Chen,Yidong Liu,Yonggang Min
This study addresses the limitations of traditional polyimides (PIs) in high-frequency and high-temperature soft electronic applications, and then introducing trifluoromethylbenzene (TFMB) into the molecular structure and employing various diamines as connecting components to solve the bottleneck. The innovative molecular design enhances thermal, mechanical, and dielectric properties, overcoming challenges in balancing these performances. The optimized fluorinated PI (TPPI50) exhibits exceptional properties, including a glass transition temperature of 402 °C, thermal decomposition temperature of 563 °C, tensile strength of 232.73 MPa, elongation at break of 26.26%, and dielectric constant of 2.312 at 1 MHz with a dielectric loss as low as 0.00676. These improvements are attributed to the unique synergy between TFMB’s fluorinated groups, which reduce molecular polarization, and the biphenyl structure, which reinforces chain stability. Compared to conventional PIs, TPPI50 demonstrates superior comprehensive performance, making it highly suitable for soft circuits, high-frequency signal transmission, and advanced applications such as wearable devices and biosensors. This study provides a robust framework for industrial applications, offering a path to next-generation soft electronics with enhanced reliability and performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Hu Luo,Shaohui Yin,Shuai Huang,Fengjun Chen,Qingchun Tang,Xiaojie Li
Zinc and its alloys are valuable crucial materials applied in the fields of automobile, ship manufacturing and construction industries. However, their application is limited due to poor performance on water-resistance, condensation and anti-icing property. Slippery liquid-infused porous surface (SLIPS) has been widely used owing to excellent water-repellent, condensation and anti-icing properties. In this work, a SLIPS was fabricated based on zinc substrate by using electrochemical etching, low surface energy modification and lubricant infusion, successively. According to the SEM morphologies and EDS images, it could be confirmed that the rough porous surface structure, low surface energy modification and infused lubricants are key factors accounting for the excellent anti-wetting property of fabricated slippery Zn surface. The experimental results showed that the SLIPS on zinc substrate exhibited outstanding water-repellent performance at a wide range of temperature and drop impact velocity. Moreover, its anti-wetting ability can be sustained even under the impacts of droplets or the continuous water jet. Owing to its dropwise condensation strategy, the SLIPS shows reasonable water collection efficiency, which exceeds 60 mg/(cm 2 ·h) at relative humidity of 90%. The excellent anti-icing property is demonstrated by the simulated ice rain test and deicing force test. And the results showed that only tiny residue ice left on the SLIPS and the deicing force was 2–3 times smaller than ordinary surface. The prepared SLIPS is expected to be an adaptable and efficient method for enhancing the water-repellent, condensation and anti-icing properties of zinc substrate, and may expand the application in energy-efficient fluid handing & transportation, medicine and anti-fouling operating in low temperature environment.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Dielectrics
·
2022
·
IF 0
Chuan Chen,Yan Wang,Jiajiu Li,Chaofeng Wu,Guanrong Yang
A series of (100 − x ) Pb(Mg 1 / 3 Nb 2 / 3 ) O 3 − x PbTiO 3 (PMN − x PT, x = 24, 25, 26) ceramics were prepared by solid-state reaction technique using MgNb 2 O 6 precursor. The results of the detailed characterizations reveal that the content of PT has negligible influence on the grain size, and all samples possess the perovskite structure. As the PT content increases, the samples changed from the normal ferroelectric phase to the ergodic relaxor state at room temperature. As a result, PMN– x PT ceramics are endowed with electro-strain of 0.08% at a relatively low electric field of 2 kV/mm, and effective piezoelectric coefficient of 320 pm/V was obtained. Simultaneously, the PMN– x PT ceramics have exceptional pyroelectric performance, exhibiting a high pyroelectric coefficient p ∼ 5.5 – 6.3 × 10 − 8 C⋅cm − 2 ⋅K − 1 . This study demonstrates the great potential of PMN– x PT for piezoelectric and pyroelectric device applications.
研究领域:
材料科学
·
物理学
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产品关联
DOI
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Lin-Lin Zhu,Hong-Lan Liu,Hua-Tay Lin,Xing-Hao Tan,Jia-Hao Chen,Xin Xu,Guang-Xiang Zhang,Yu-Jian Jian,Min-Min Dai,Cheng-Cai Zhao
Erbium oxide (Er 2 O 3 ) transparent ceramics were successfully fabricated with different contents of zirconia (ZrO 2 ) additive sintered at 1850 °C for 8 h in vacuum. The effects of ZrO 2 concentration on microstructure, optical, mechanical, and thermal properties of Er 2 O 3 transparent ceramics were systematically investigated in this study. With the concentration of ZrO 2 increasing from 0 to 4 at.%, the average grain size of Er 2 O 3 transparent ceramics decreased from 166.6 to 4.7 μm. Also, the Vickers hardness and fracture toughness were increased from 7.6 ± 0.3 to 10.1 ± 0.3 GPa and 0.69 ± 0.05 to 1.09 ± 0.03 MPa m 1/2 , respectively. However, the thermal diffusion coefficient and thermal conductivity reduced slightly after the doping of ZrO 2 . The in-line transmittance of 4 at.% ZrO 2 -doped Er 2 O 3 ceramics with the excellent optical quality reached 77% in the visible range and 78% at 1100 nm, which were 95% and 96% of the theoretical in-line transmittance of Er 2 O 3 single crystal, respectively. There were absorption peaks at 1500 nm and in the visible light range of 4 at.% ZrO 2 -doped Er 2 O 3 ceramics. The Er 2 O 3 ceramics developed in this study can be potential candidates for application in solid-state lasers.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Shengda Wang,Shenghui Lou,Penghui Fan,Li Ma,Jie Liu,Tao Tang
For improving the flame-retardant performance of epoxy thermosets without sacrificing other properties, a novel aromatic imine-containing DOPO-based bisphenol, DOPO-AI, was synthesized. Diglycidyl ether bisphenol F epoxy resin (DGEBF) reacted with DOPO-AI first, followed by curing with 4, 4′-diaminodiphenylmethane (DDM). When the mass of DOPO-AI was 25% of DGEBF, the resulting epoxy thermoset EP/20DOPO-AI exhibited the V-0 rating with the limiting oxygen index of 35.4%. In the cone calorimetry test, the peak heat release rate and total heat release of EP/20DOPO-AI showed the reduction of 26% and 27%, respectively, compared to those of DGEBF/DDM (EP). The mechanism of DOPO-AI in reducing heat release and increasing char-form ability of EP/DOPO-AI was studied. Interestingly, the mechanical and thermal mechanical properties of EP/20DOPO-AI were improved, although the crosslinking density was much lower than that of EP. The tensile strength and storage modulus of EP/20DOPO-AI were increased by 13% and 5%, while the glass transition temperature and the elongation at break were kept, compared with those of EP. The high rigidity of DOPO and aromatic imine was the reason for the improvement of the mechanical properties of EP/20DOPO-AI. Furthermore, EP/20DOPO-AI showed a small reduction in thermal stability, compared with that of EP.
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 APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Chaoyi Guo,Jie Jiang,Zhihua Zhu,Jinjin Li,Ling Zhao,Zhenhao Xi
Semi-aromatic nylon MXD6 shows superior mechanical strength and gas barrier properties. To improve its toughness and get sight into its excellent properties, a series of poly( m -xylylene adipamide-co-isophthalamide) (MXD6/I) random copolyamides were synthesized using adipic acid, isophthalic acid (IPA) and m -xylylene diamine as monomers via direct melt polycondensation. The effect of IPA content on the thermal, crystallization, heat resistant, mechanical, and barrier properties of the copolyamides were systematically investigated. The results showed that the increase of IPA content from 0 to 12 mol% resulted in a decrease in the melting point of the copolyamides from 238 to 217°C but the glass transition temperature ( T g ) increased from 88 to 105°C. Correspondingly, the Vicat softening temperature decreased from 199.2 to 172.5°C. The crystallization rate of the copolyamides significantly decreased with the increase of the IPA content. The copolyamides had improved elongation and rupture energy and decent oxygen barrier properties with the introduction of IPA. It is expected that this study would guide design of MXD6 macromolecular chain structure to prepare high-performance MXD6 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
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jun Wang,Kai Yan,Chenglong Mu,Qunna Xu,Zejian Yang,Can Zhou,Lin Yang
Traditional wound patches are primarily designed to provide protection, maintain moisture, and foster a healing environment. However, current flexible wound patches face challenges related to self-healing capabilities, antimicrobial performance, and stable sensing functions. To address these challenges, this study harnesses the synergistic potential of aqueous MXene nanosheets and quercetin-modified waterborne polyurethane (Que-WPU) to fabricate an innovative film patch. The film patch exhibits stable adhesion to human skin and shows significant inhibitory effects on Staphylococcus aureus due to the natural antibacterial agent quercetin, with a zone of inhibition that reaches 4 mm. Furthermore, the antibacterial efficiency is further enhanced to 100% because of the excellent photothermal properties of MXene under near-infrared laser irradiation. Meanwhile, the film patch possesses stable scavenging activity against DPPH and ABTS+ free radicals and exhibits good blood compatibility and cytocompatibility with an in vitro hemolysis rate of 4.7% and negligible toxicity to HaCaT cells. It also displays a robust self-healing performance, completely repairing scratches within 2 min. Additionally, the film patch can detect clear and stable sensing signals under continuous human body part movement cycles, with sensing sensitivity (Gauge Factor) of 2.1. In summary, these results underscore the immense potential of MXene/Que-WPU composite materials in wound healing and tissue engineering applications.
研究领域:
生物医学材料
·
组织工程
·
伤口愈合
✓ 已验证
产品关联
DOI
高影响因子
European Journal of Wood and Wood Products
·
2024
·
IF 2.4
Wu Shuangshuang,Na Ren,Avramidis Stavros,Xu Wei
Combining decorative and functional elements is an essential trend in the value-added nature of fast-growing wood, which can promote its commercial application in wood-based boards, interior decoration, and furnishings. This study introduces a convenient method for preparing modified veneers that can replace the predominant market colors by adjusting the pH value and furfuryl alcohol (FA) concentration. The physical, mechanical, anti-mildew, and sound insulation properties were systematically evaluated. The results revealed that pH significantly affected color, and the surface bonding strength of all modified veneers met standard requirements. The shear strength, sound insulation properties, and dimensional stability of the plywood made from 70% FA-modified veneer at strong acid conditions were significantly improved, but the bending strength was reduced. Analysis of Variance revealed that pH values and FA concentration significantly affected the color changes. Combined with scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), and Fourier-transform infrared spectroscopy (FTIR) results, it was shown that the distribution of the FA and the interaction between FA and cell wall chemical components were influenced by pH values and furfuryl alcohol concentration, which are likely responsible for the color and property changes.
研究领域:
木材科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 20
·18950-18958
·
IF 2.195
Fu Mingtao,Li Caixia,Yang Bin,Liu Danqing,Bian Lang,Hong Yuenan,Zhang Changhai,Chen Chuntian,Lin Jiaqi
The Ba 0.985 Ca 0.005 Ti 0.98 Sn 0.02 O 3 + x mol% MnO 2 (BCTSM x , x = 0, 0.2, 0.3, 0.4, 0.5 and 0.6) ceramics were fabricated by conventional solid-state reaction method. The effects of MnO 2 doping on the phase structure, microstructure, dielectric, ferroelectric and piezoelectric properties of Ba 0.985 Ca 0.005 Ti 0.98 Sn 0.02 O 3 ceramics were investigated systematically. X-ray diffraction patterns revealed that the BCTSM x ceramics are composed of coexisting tetragonal-orthogonal phases. The addition of MnO 2 could significantly improve the sinterability of BCTS ceramics. The BCTSM x ceramics with x = 0.4 demonstrated an optimum electrical properties: ε r = 2802, tan δ = 0.081, T C = 121 °C, ε max = 9977, P r = 11.8 μC/cm 2 , E C = 2.6 kV/cm, bipolar S max = 0.25%, unipolar S max = 0.28%, d
* 33
= 1093 pm/V, d 33 = 325 pC/N, k p = 43.2%, and Q m = 118.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）