POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Shuo Huang,Yajuan Feng,Shengnan Li,Yang Zhou,Fengxiu Zhang,Guangxian Zhang
A novel self-buffering flame retardant ammonium amino trimethylene phosphate (AATMP) was synthesized by a facile one-step water-solvent method to solve the problem of flammable cotton triggering easily and spreading fire. The structure of AATMP FR was verified by FT˗ IR, 1 H NMR, 13 C NMR, and 31 P NMR spectra. AATMP was grafted onto cotton fabrics using the dip-dry-cure method, and the grafted cotton was confirmed by FT-IR spectra. The limiting oxygen index (LOI) of cotton treated with a mass concentration of 15% AATMP solution reached 43.9%. After 30 and 50 laundering cycles, LOI values were maintained at 34.8% and 29.7%, respectively, suggesting that AATMP can be used as a durable flame retardant. The vertical flammability of treated cotton indicated no afterflame or afterglow time for comparison. Cone calorimetry results revealed that the total heat release of treated cotton was 1.6 MJ/m 2 , lower than that of control cotton (2.8 MJ/m 2 ). The peak heat release rate of control cotton was 195.1 kW/m 2 , much higher than that of treated cotton (16.1 kW/m 2 , further confirming the efficient fire resistance of AATMP. Thermogravimetry analysis and thermogravimetric-infrared spectroscopy indicated that AATMP FR altered the thermal decomposition pathway of treated cotton. X-ray diffraction patterns and scanning electron microscopy suggested that the structure of treated fibers was hardly affected. The tensile strength and whiteness of treated cotton fabrics were sustained well due to the self-buffering property of the neutral AATMP molecule.
研究领域:
材料科学
·
纺织工程
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Caiyan Wan,Peixiu Tian,Mingsheng Liu,Guangxian Zhang,Fengxiu Zhang
Cotton is the seed fiber of the Gossypium plant (from the Malvaceae family), which is one of the most important crops worldwide and is suitable for the application in clothes, furniture, and industrial fabrics areas. Combustible cotton easily triggers fire hazard. Thus, a phosphorous˗nitrogen flame retardant, ammonium salt of tris˗(hydroxymethyl)˗aminomethane˗penta(methylphosphonic acid) (ATPMPA) was synthesized to produce fire˗retardant cotton. The ATPMPA structure was characterized by nuclear magnetic resonance ( 1 H NMR, 13 C NMR, and 31 P NMR) spectroscopy. ATPMPA flame˗retardant cotton was prepared by phosphate esterification between ATPMPA and the ˗OH groups of cotton cellulose. Scanning electron microscopy verified that the surface of the treated cotton fiber was not obviously changed. The flame retardantcy of cotton was tested using the LOI, vertical burning and cone calorimetry. The results revealed that the LOIs of the control cotton and treated cotton fabrics increased from 18.4% to 40.8%, 42.4%, and 43.6% after treated with 20 wt%, 30 wt% and 40 wt% flame retardant, respectively. After 50 laundering cycles (LCs), the LOIs of the treated cotton fabrics only decreased to 26.7%, 30.8%, and 32.3%, respectively, indicating that treated cottons obtained the superior flame retardancy and excellent washing resistance. Thermogravimetry (TG) analysis showed that the charring ability of the treated cotton was markedly improved. TG-IR result of treated cotton indicated that the decomposition temperature and the amount of volatile matter produced by the flame-retardant cotton were lower than that of control cotton. The whiteness of treated cotton sustains well.
研究领域:
材料科学
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纺织工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yingjie Cai,Le Li,Tianjie Wang,Ying Ren,Md. Nahid Pervez,Ai Chen,Xiaohua Zhao,Lina Lin,Xiaorong Xiong,Mohammad Mahbubul Hassan
This study explores a new approach to achieve a whitening effect on polyester fabric by utilizing a ground form of raw OB-1 (OB-1-G) in combination with dispersing agents. The whitening process parameters, such as whitening temperature, OB-1-G mass, and whitening time were optimized using the L 16 orthogonal array-based Taguchi methodology. The signal-to-noise ratio was carried out through a larger-is-better approach to augment the parameter responses, specifically the whiteness. The results suggest that the degree of whiteness of polyester fabric is significantly affected by the whitening treatment temperature (P < 0.05), with a contribution percentage of 93.87%. A whiteness index of 94.12 was achieved for the polyester fabric treated at the optimized conditions. The fabric treated with OB-1-G at the optimized conditions was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The investigation also included the correlation between the length of time spent in washing and rubbing, and their efficacy in achieving whitening outcomes. The research demonstrated the effectiveness of OB-1-G nanopowder in combination with dispersing agents as a fluorescent optical brightener for the optical brightening of polyester fiber with potential use in the textile industry on a larger scale.
研究领域:
纺织科学
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材料科学
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产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Yanqin Shi,Songyan Lu,Biao Ma,Meng Ma,Huiwen He,Si Chen,Xu Wang
A “one stop” thermal stabilizer , zinc arginine complex (Zn(Arg) 2 ), with excellent excellent initial whiteness, whiteness retention and long-term thermal stability time for PVC , was conveniently synthesized in water solution. The successful synthesis of Zn(Arg) 2 was confirmed by FTIR, TGA and element analysis . Besides the longer Congo red and static thermal stability time than nitrogen-containing thermal stabilizer reported, Zn(Arg) 2 also had better initial whiteness, whiteness retention and dynamic thermal stability time showed by Congo red test, discoloration test and torque rheology test. Especially, the static thermal stability time was more than 150 min, and the dynamic thermal stability time reached 78 min. The excellent thermal stability effect of Zn(Arg) 2 on PVC was ascribed to the simultaneous possession of three mechanisms: absorbing HCl, replacing labile chlorine atoms and complexing ZnCl 2 . Moreover, PVC with Zn(Arg) 2 also showed excellent transmittance tested by vis-uv-near infrared spectrophotometer. Therefore, Zn(Arg) 2 is a “one stop” thermal stabilizer with good application prospects in transparent PVC.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Material Cycles and Waste Management
·
2024
·
IF 2.7
Zheng Zhengqiang,Weng Changzhou,Kang Zeyu,Zhong Minhua,Yu Changyong,Lin Zhang,Liu Weizhen
In China, large amounts of industrial byproduct gypsum (IBG) end up as waste and excessive stockpiling due to its low whiteness and high impurity content. In this study, two typical IBG including phosphogypsum (PG) and flue gas desulfurization gypsum (FGDG) were the research object. The impurities removal and the whiteness improvement by the tandem pyro-hydro process were investigated. Species of impurities, mechanism of whiteness improvement and the evolution of the gypsum phase during the tandem process were revealed. The results indicate that the impurities responsible for the poor whiteness of IBG included organic matter, carbon particles, and silicates. The temperature of the pyro process is the critical factor. The IBG is calcinated at 400–500 °C to fully remove organic matter and carbon particles, while decompose silicates to silica. Following, in the hydro step, the calcined IBG was treated with dilute sulfuric acid (0.2–1.0 M) to remove ion impurities such as Fe(III), the higher temperature and higher acidity are favorable to the production of valuable CaSO 4 . After treatment, the whiteness of IBG was improved from below 40% to above 80%, and the soluble impurity content can meet the standards. Moreover, both PG and FGDG products exhibited a compressive strength exceeding 10.0 MPa of curing for 7 d. This work provides theoretical guidance to promote the resource utilization of IBG, especially as plastering materials after purification and whitening. Graphical Abstract
研究领域:
材料科学
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环境工程
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Jianyu Wu,Zilun Tang,Xiaochun Liu,Wenjing Lin,Minghui Feng,Xiaofeng Lin,Yuxin Gu,Yong Li,Guobin Yi
Herein, as two types of rational designed thermal stabilizers, the maleic acid-sorbitol ester (MS) and zinc maleic acid-sorbitol ester complex (Zn-MS) with unsaturated carbon double bonds were synthesized to improve the initial whiteness and long-term thermal stability for polyvinyl chloride (PVC). The successfully synthesized MS and Zn-MS had three functions of replacing the labile chlorine on the PVC chains, reducing the “zinc burning” and absorbing the hydrogen chloride (HCl) released by PVC. After introducing the MS and Zn-MS, the stability time of PVC could be extended to more than 140 min and 120 min at 180 °C, respectively. Additionally, both the MS and Zn-MS had showed lower-torque effect on rheology and less-implications for plate-out in PVC. The addition of MS and Zn-MS could promote the dispersion of composition in the PVC matrix and endow the PVC with better strength and toughness. Meanwhile, in contrast with ZnSt 2 or CaSt 2 , the transparency of PVC sheet stabilized by MS and Zn-MS also showed the higher transmittance, which severally reached to 57.2% and 72.1%.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 4
·905-913
·
IF 1.1
Pang Zengyuan,Gao Pengxiang,Meng Haonan,Cheng Zhenyu,Li Shen,Zhu Yanan
One-dimensional titanium dioxide (TiO 2 ) whiskers with controllable aspect ratios were synthesized by molten salt method adopting anatase TiO 2 nanoparticles as precursor, sodium chloride (NaCl) and dibasic sodium phosphate (Na 2 HPO 4 ) as medium. The particle size of TiO 2 nanoparticles and ratio of precursor and medium that can help to generate high aspect ratio TiO 2 whiskers were studied and selected. Light-colored antimony-doped tin oxide @ titanium dioxide (ATO@TiO 2 ) conductive whiskers were prepared by coating ATO on TiO 2 whiskers through coprecipitation then. Finally, the ATO@TiO 2 light-colored conductive whiskers were dispersed in polyacrylonitrile (PAN) to fabricate light-colored conductive fibers. The experimental results show that the ATO@TiO 2 whiskers exhibits ideal whiteness and conductivity with 65.5 Wb and 106 Ω·cm, respectively, and the resistivity of conductive fibers was 6.07×10 6 Ω·cm with 15wt% whisker content.
研究领域:
材料科学
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纳米技术
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无机合成
·
高分子科学
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材料导电性能
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Jinkai Hou,Yong Lian,Zheng zeng,Hu Luo,Hui Wang,Yuhan Sun
ABSTRACT The recycling of plastic waste has gained importance in reducing environmental pollution and optimizing resource utilization in recent years. A promising approach is the conversion of waste polyethylene (PE) into polyethylene waxes (PEW). In this work, waste agricultural film (WAF) was utilized as feedstock to produce PEW. The pyrolytic waxes obtained exhibited a viscosity-average molecular weight ranging from 2000 to 7000 g/mol, with a yield exceeding 95% between 380-410°C, a time period of 15 to 45 minutes, and at a ratio of 1:1 of decahydronaphthalene solvent to raw material. The reaction mechanism for the production of waxes during PE pyrolysis involved the generation, transfer, isomerization, recombination and dehydrogenation reactions of free radicals, which predominantly leads to the formation of PEW, accompanied by the generation of other small hydrocarbon molecules. Besides, the color formation of the waste film pyrolytic waxes with a whiteness of 19.8 was due to inorganic salts and organic compounds such as conjugated components and aromatics, and the pyrolytic waxes could be transformed into white with a whiteness of 85.4 through selective hydrogenation.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Yan Liu,Yan Xie,Shanshan Tian
To increase the utilisation and added value of low-whiteness barite, this study developed-for the first time-a whiteness enhancement method based on an alkali additive (Na 2 B 4 O 7 ·5H 2 O-Na 2 CO 3 ) and optimised the roasting process for removing impurities via single-factor experiments and response surface methodology. Various characterisation techniques, such as X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, thermogravimetry–differential scanning calorimetry and backscattered electron scanning electron microscopy, were employed to analyse and compare the physical and chemical properties of raw barite mineral as well as conventionally roasted and intensively roasted samples. In addition, the influence of the alkali additive on impurity removal during the intensive roasting of barite and the underlying whitening mechanism were investigated. Experimental results showed that roasting at 896 °C for 2.33 h with an alkali additive-raw barite mineral mass ratio (m Na2B4O7 · 5H2O :m Na2CO3 :m barite ) of 0.60:0.60:20 increased barite whiteness from 26.0 % to 95.7 %. The proposed method mainly involved using the alkali additive in the molten state to capture insoluble impurities (e.g. quartz, dolomite, calcite, and kaolinite) in the mineral samples at high temperatures. Furthermore, it generated borates, sodium compounds, and alkaline silica-aluminium salts (which were more easily soluble in sulphuric acid) and finally removed them via acid leaching and washing processes, further enhancing the whiteness of the mineral samples.
研究领域:
矿物加工
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材料科学
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应用化学
·
物理化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Tianfeng Han,Hui Xue,Xiaobo Hu,Ruiling Li,Huilan Liu,Yonggang Tu,Yan Zhao
In this paper, the effects of NaOH, NaCl, and heat on the appearance, physical characteristics, and gel structure of duck egg white (EW) jointly induced by NaOH, NaCl, and heat were investigated. Results showed that the absolute value of zeta potential (TAV-ZP) of gel samples increased, hunter whiteness decreased, gel opacity decreased, and the microstructure of gel appeared as a loose network structure with increased NaOH addition. With the increase of NaCl addition, TAV-ZP of gel samples decreased, hunter whiteness increased, gel opacity increased, the microstructure of gel became dense. With the increase of heating temperature, TAV-ZP of gel samples decreased, hunter whiteness decreased, gel opacity increased, the microstructure of gel became dense first and then loosened. The results of SDS-PAGE, surface hydrophobicity, T 2 , hardness, cohesiveness indicated that protein molecules underwent cross-linking, aggregation, and unfolding during duck EW gelation jointly induced by NaOH, NaCl, and heat. The results of strain-stress curve showed that all gel samples had a good anti-compressed ability. The results of central composite design showed that the best treatment of gel was heating temperature 91 °C, NaOH 0.48%, and NaCl 0.3%.
研究领域:
食品科学
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化学
·
生物物理学
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产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 102
·期 15
·7136-7143
·
IF 4.125
Kangyuan Long,Tonghao Zhang,Jae W Park,Joodong Park,Tao Yin
BACKGROUND Washing is an essential process in surimi production, from which a large amount of wastewater is generated. Due to the increasing pressure of environmental protection, it is an urgent technical requirement for surimi manufacturers to reduce water usage while maintaining the quality of surimi. In this study, composition, structure and gelling properties of grass carp surimi prepared with a modified washing process (MWP) were investigated. Intermediate dehydration with various compression ratios were utilized between two washing cycles. RESULTS Water usage and wastewater discharge were reduced significantly by 33% and 38%, respectively, when MWP was applied. As the compression ratio increased, composition of fat, cathepsins, transglutaminase and heme proteins in surimi decreased gradually. Yield, protein content and the major protein pattern of surimi were not changed, but surface hydrophobicity gradually decreased. As the compression rate increased to 1:2.0, textural values and water holding capacity of the corresponding surimi gel decreased gradually, while whiteness increased and then remained unchanged. At a higher compression ratio (>1:1.5), aggregated network and excessive free water were observed in the surimi gel. Composition and gelling properties of the MWP surimi with a compression ratio of 1:1.2–1:1.5 were equal to those of the surimi prepared under conventional three-cycle washing. CONCLUSION Results indicated that MWP demonstrated its great potential in surimi production by dramatically reducing the usage of cold water and discharge of wastewater without scarifying surimi quality. © 2022 Society of Chemical Industry.
研究领域:
食品科学
·
环境工程
·
水产加工
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Junjie Huang,Dongxia Yan,Huixian Dong,Fei Li,Xingmei Lu,Jiayu Xin
Chemical recycling is a promising way to achieve the closed-loop recycling for polyethylene terephthalate (PET). During this process, the post-consumer PET is depolymerized into bis(2-hydroxyethyl) terephthalate (BHET) through glycolysis and BHET can be polymerized again to produce recycled PET (rPET). However, since the applications of rPET is greatly limited to the color, recycling of PET fibers is challenged by the residual of colored impurities. In this study, a modified recrystallization process using ethyl acetate (EA) as the solvent was employed for the removal of colored impurities from the BHET. The process showed a decoloring rate of over 97.5% for the model colored impurities, performing better than the reported physical adsorption processes . Since almost no disperse dye was precipitated during the nucleation and crystal growth process due to the high solubility in EA, only a small amount of colored impurities adsorbed on the surface of crystals, leading to an excellent decolorization performance and post-consumer EA could be easily recycled through evaporation followed by condensation. Besides the model colored BHET, raw BHET obtained from the depolymerization of dark PET fibers was also purified by this modified recrystallization. By applying a composite purification strategy combining EA-based recrystallization and activated carbon adsorption, the whiteness (L*) of BHET greatly increased from around 65 to over 95 (L*=100 for pure white) and the whiteness of rPET produced from purified BHET (L*=86.21) was greatly improved compared with that from raw BHET (L*=44.01), showing the possibility of achieving the closed-loop recycling of dark PET fibers.
研究领域:
材料科学
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环境科学
·
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）