JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Gangwei Jiao,Yang Cao,Xiaodong Liu,Qiang Fu,Ning Gu,Ying Ren,Youyi Sun
Because of the significant advantages of bone adhesives compared with traditional mechanical fixation, many scholars have studied polyurethane bone adhesives. However, polyurethane will release a lot of heat in the reaction process, producing high temperature. The high temperature does not only easily cause a human discomfort but also will destroy the tissue structure of human. In this paper, a new polyurethane composite based on phase transition materials and hydroxyapatite is prepared to reduce released heat for application in bone binder. The mechanical properties, adhesive strength, and released heat-induced temperature of polyurethane composite are investigated in detail. It exhibits good viscoelastic performance with a large elastic deformation (>30%) and good adhesive strength (>0.2 MPa). Furthermore, the released heat of polyurethane composite is effectively reduced, in which the temperature drastically decreases from 110.4 to 41.8°C. The work does not only confirm formation of high-performance bone binder but also provides a new method to reduce released heat of polyurethane for various applications.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zhengliang Deng,Yajun Wang,Ruihua Liu,Wenyu Li,Qiang Gan
In order to improve the overall performance of traditional thermite, Al/B/Fe 2 O 3 composite thermites were synthesized using electrophoretic deposition technology. The morphology, structure, composition, thermal reaction properties, reaction process, and reaction activity were investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray energy dispersive spectrometry (EDS), X-ray diffractometer (XRD), and simultaneous thermal analyzer (TG-DSC). The results indicate that the components of the prepared Al/B/Fe 2 O 3 composites were uniformly distributed and closely interconnected, with the preparation process not altering the composition and structure of the components. Compared with Al/B/Fe 2 O 3 thermite prepared by physical mixing and Al/Fe 2 O 3 thermite by electrophoretic deposition, the Al/B/Fe 2 O 3 thermite prepared by electrophoretic deposition exhibited a lower reaction onset temperature (524.9 ℃), higher heat release (1240.9 J·g −1 ), and greater reactivity ( E a =168.3 kJ·mol −1 ). These findings underscore the significant enhancement effect of boron addition and the electrophoretic deposition method on the overall performance of Al/Fe 2 O 3 thermite. Analysis of the reaction mechanism reveals that the Al/B/Fe 2 O 3 composite thermites underwent a series of complex transformations, including thermite reactions, alloying reaction between Al and B, direct oxidation reactions of Al, B, Fe, and nitriding reaction of B, within the temperature range of thermal analysis from room temperature to 1100 ℃. These results provide crucial support for material innovation, performance optimization, and application expansion of thermites.
研究领域:
材料科学
·
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Wenyu Li,Yajun Wang,Qiang Gan,Zhengliang Deng,Junhan Gao
Developing efficient oxidizers is critical for advancing nano thermites. Titanium oxyfluoride (TiOF 2 ) with oxygen/fluorine dual-active centers is innovatively employed as an oxidizer in Al/TiOF 2 composites prepared via physical mixing. Structural and morphology characterization confirms uniform interfacial contact while preserving component stability. The system demonstrates exceptional reactivity: onset and peak reaction temperatures (409.4°C, 470.0°C) are reduced by 139.1°C and 130.7°C, respectively, versus Al/TiO 2 , with activation energy lowered to 84.35 kJ·mol −1 . Synergistic F–O interactions impair reaction barriers, yielding 3692.2J·g −1 heat release (120 % increase over Al/TiO 2 ). Combustion tests reveal vigorous ignition under low energy input, rapid flame propagation, and two-stage spark ejection. This work reveals the activation mechanism of oxyfluoride as an oxidizer for thermites: fluorine enhances the reaction kinetics through an interfacial modification effect, while oxygen guarantees the energy density of the system. The synergy of the two elements realizes the optimization and regulation of combustion performance.
研究领域:
材料科学
·
化学工程
·
含能材料
·
纳米技术
·
燃烧化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 35
·期 1
·e6238
·
IF 3.4
Ben Hu,Jun Wang,Xi Chen,Jingsheng Wang,Shuang Yang,Lu Zhu,Lanian Zou,Siqi Huo
This work reported a flame-retardant, single-component epoxy resin (EP) via introducing diphenylphosphine (DPP) and benzimidazolyl-substituted cyclotriphosphazene (BICP) into EP. The differential scanning calorimetry (DSC) test showed that the onset curing temperature of DPP/BICP-15/10 was 50°C lower than that of BICP-12 due to the catalytic decomposition effect of DPP toward BICP under heating. Besides, the shelf life of DPP/BICP-15/10 at room temperature reached ~14 days, demonstrating good storage stability. EP/DPP/BICP maintained satisfactory thermal properties and showed excellent flame retardancy with a UL-94V-0 classification. Compared with the unmodified EP sample, the peak heat release rate (PHRR) and total heat release (THR) of DPP/BICP-15/13 were decreased by ~68.1% and ~55.1%, respectively. Hence, this flame-retardant, single-component epoxy resin with satisfactory comprehensive properties exhibited great potential for versatile industrial applications.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Jirui Qu,Yusheng Tong,Yujiao Bi,Wenbo Sun,Yanyue Shi,Zexuan Zhao,Zhihui Liu,Shaofeng Wang,Lei Liu,Xilei Chen,Chuanmei Jiao
In recent years, P-N based hybrids flame retardants have received more and more attention in the field of fire safety due to their synergistic effect in the gas and condensed phases, which makes it easy to achieve efficient flame retardancy. However, their flame retardant mechanism in the gas phase rests more on the increase of non-flammable gases than on the conversion of harmful gases to harmless gases, and their hybrids are often not sufficiently stable. Therefore, in this study, P-N hybrids were encapsulated and modified using MXene, which has high thermal stability and outstanding catalytic ability, to prepare a novel flame-retardant hybrid, MDAPP, which was incorporated into rigid polyurethane foam (RPUF) to achieve more efficient fire safety performance. The results showed that MDAPP significantly enhanced the fire safety properties of RPUF composites. Specifically, RPUF-2.0MDAPP resulted in 40.98%, 63.16, and 60.00% decreases in total heat release (THR), total smoke release (TSP), and CO production rate (COPR) of RPUF, respectively. Moreover, the system also achieves synergistic flame retardant effects in the gas and condensed phases. At the same time, RPUF-2.0MDAPP has excellent thermal shielding performance, with a temperature reduction of 88.14% compared to RPUF in a fire source heating test when placed in a vertical position. In addition, the compressive strength and hydrophobicity of RPUF-2.0MDAPP have been improved to ensure its longevity in complex environments. This study proposes a solution to the problem of reducing the fire risk of RPUFs and promotes the widespread use of RPUF.
研究领域:
消防安全工程
·
材料科学
·
高分子科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 6
·3783-3796
·
IF 4.9
Yin Xuchu,Wang Yuting,Xu Zhiguang,Zhang Tao,Zhao Yan
Cellulose-based, porous materials (polyHIPEs) templated from emulsions are promising for thermal insulation, but their high susceptibility to combustion when exposed to fire hinders the materials from various applications. Here, we report the fabrication of flame-retardant, cellulose-based, thermal insulating polyHIPEs and their application for early fire warning. The polyHIPEs were synthesized from cellulose crystal-stabilized Pickering emulsions, containing ammonium salt of 1-hydroxyethylidene-1,1-diphosphonic acid as a reactive flame retardant, with or without MXene. The resulting polyHIPEs exhibited pre-designable external shapes, flexibility, robust compression, excellent thermal insulation with a thermal conductivity as low as 31.9 mW/(m·K), and high flame-retardant performance with a limit oxygen index up to 52.4% and with heat release rate and total heat release to be as low as 0.9 kJ/g and 13.7 W/g, respectively. The high thermal insulation and flame-retardant performance, combined with the responsive resistance of MXene, enabled the MXene-containing polyHIPEs to be excellent candidates for early fire warning, with warning to be realized within 3 s, with or without external power supply. Graphical abstract
研究领域:
材料科学
·
化学
·
消防安全工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Zhipeng He,Huichao Liu,Guang Yang,Chi Jiang,Muwei Ji,Jiali Yu,Mingliang Wang,Caizhen Zhu,Jian Xu
Cyclization reaction of poly(acrylonitrile-co-2-acrylamido-2-methylpropane sulfonic acid) [P(AN-co-AMPS)] copolymer during thermal oxidative stabilization (TOS) process was investigated by FTIR and two dimensional (2D) correlation analysis technique. The results showed the mechanism of cyclization reaction at different temperatures were varying. At 200 °C, the cyclization reactions generated by autocatalytic cyclization mechanism. While at higher temperatures, the cyclization reactions took place through ionic cyclization mechanism and free radical cyclization mechanism. The AMPS comonomer could reduce the heat release of cyclization reactions and improve the stability at 200 and 230 °C. At higher temperatures, the cyclization reactions were facilitated rapidly. However, the oxidation and degradation reactions were also intense, which will cause the molecular chain to break and defects in the final carbon fibers (CFs). This research has theoretical guiding significance for the optimization of heat treatment conditions for PAN copolymers used as CFs.
研究领域:
高分子化学
·
材料科学
·
光谱学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Kunxin Wang,Kun Wu,Zhencai Qu,Yifei Wu,Enxiang Jiao,Xiaole Zheng,Jun Shi
Carboxylic multi-walled carbon nanotubes (MWCNTs–COOH) and dopamine were combined to prepare DCNT hybrid nanostructure through amidation reaction, and as-obtained materials were further used as fire retardants introduced into graphene oxide (GO) to fabricate GO/DCNT composite films. The corresponding PHRR (up to 98.58%), THR (utmost to 20.29%), TSR (over 99.09%), SPR (above 67.66%) values were reduced remarkably. As a similar trend, significant decreases of 95.74% and 99.16% in release of CO 2 and CO were achieved. Flame retardant index (FRI) increased from 1.65 to 2.43, indicating the enhanced fire safety performance of GO . These positive results are attributed to the synergistic effect of gas phase flame retardant and condensed phase flame retardant between dopamine and MWCNTs. Raman spectra confirmed that the degree of graphitization of the carbon layer has been greatly improved, contributing to insulate the transfer of oxygen and heat. Meanwhile, GO/DCNT30 composite film exhibits ultra-fast intelligent fire alarm response capability (1 s). This work will provide a new method for the preparation of high-efficiency flame-retardant and ultra-fast intelligent fire alarm response materials.
研究领域:
材料科学
·
消防安全工程
·
纳米技术
✓ 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）