CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Guanjun Wen,Kuibao Zhang,Haibin Zhang,Yuancheng Teng,Ye Zhou
Synroc is recognized as the second generation waste form for safety disposal of high-level radioactive waste (HLW). In this study, the Synroc mineral of rutile was employed as host phase for the immobilization of Nd 2 O 3 and CeO 2 , which were selected as surrogates of trivalent and tetravalent actinide nuclides. Rutile waste forms with different Nd 2 O 3 and CeO 2 incorporations were prepared under normal pressure sintering. Nd 2 Ti 2 O 7 pyrochlore was produced as the target phase in 1100 °C calcined Nd-bearing TiO 2 . Lattice stabilization of CeO 2 in rutile TiO 2 could not be accomplished even under 1500 °C sintering. The 28 day normalized leaching rates ( LR i ) of Ti and Nd in Nd-bearing rutile, which decline congruously as the Nd 2 O 3 content increases, are lower than 3×10 −5 g m −2 d −1 . The incorporation of CeO 2 significantly impairs the aqueous durability of rutile waste form.
研究领域:
核废料管理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2015
·Vol. 30
·期 6
·1179-1183
·
IF 0.399
Zhang Kuibao,Wen Guanjun,Yin Dan,Zhang Haibin
TiO 2 was employed as the waste form for disposal of simulated nuclide Sr. Preparation of Sr bearing rutile was explored under different sintering temperatures and Sr contents. The optimal treatment temperature was confirmed as 1 300 °C for the incorporation of SrO in rutile TiO 2 . Perovskite type SrTiO 3 was prepared as the resultant product. The limited containment capacity of SrO in rutile was speculated to be 56.5wt%. As the SrO content increases, the as-synthesized sample exhibits more porosity because SrTiO 3 phase demonstrates higher density than rutile and SrO. The 28 day normalized leaching rate (LRi) of Sr and Ti will decrease congruously as the SrO incorporation increases. The LR Sr value is lower than 0.1 g·m -2 ·d -1 , which is about 3 orders of magnitude higher than the LR Ti value.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 38
·50971
·
IF 3.125
Yanqing Zhao,Yingli Su,Wangcai Zou,Gang Chen,Yiqing Deng,Jun Cheng,Haisheng Ren,Qiang Zhao
In order to prepare waterborne polyurethane with excellent water resistance and thermodynamic properties, a series of side chain fluorinated waterborne polyurethane-urea (FWPU-UA) was synthesized with polytetramethylene ether glycol, N -(2-methyl-1,3-propanediol-2′-)-perfluoro-1-butanesulfonyl amine (NPBA), isophorone diisocyanate, and isophoronediamine. With the increase of NPBA content, the weight loss temperature, glass transition temperature, and tensile strength of FWPU-UA were all improved. Gaussian fitting analysis of infrared data and density functional theory simulation proved that the introduction of fluorine side chains increased the interaction of hydrogen bonding in the FWPU-UA. X-ray photoelectron spectroscopy analysis indicated that the aggregation of fluorine atoms on the surface of film were caused by the migration and enrichment of fluorine side chains. Furthermore, the water resistance of polyurethane-urea film could be significantly improved by adding a small amount of NPBA, and the seven-day water absorption rate of polyurethane-urea film was reduced from 30.13% to 12.55%.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2017
·
IF 2.048
Kuibao Zhang,Dan Yin,Le Peng,Jingjun Wu,Jiali Xue
In this study, zirconolite/Mo composites were rapidly synthesized by a self-propagation reaction that uses MoO 3 as the oxidant accompanied with pressing. Zirconolite is one of the several materials that are being researched as host for lanthanides and actinides in nuclear waste . Nd was used in this study as a surrogate for actinides and was substituted into zirconolite at a stoichiometric ratio to charge balance the Ca and Zr sites (nominal formulation of Ca 1-x Zr 1-x Nd 2x Ti 2 O 7 ). Perovskite , zirconia, and rutile were generated as the minor phases with the addition of Nd 2 O 3 . The XRD results demonstrated that the Nd 2 O 3 loading is approximately 30 wt%. Nd was mainly incorporated into the lattice structure of zirconolite and perovskite. A 42-day leaching test of the Nd-bearing zirconolite/Mo composite showed that the computed normalized leaching rates for Ca and Nd at fairly low values of 9.02 × 10 −2 and 2.10 × 10 −4 g m −2 d −1 , respectively.
研究领域:
材料科学
·
核废物管理
✓ 已验证
DOI
高影响因子
Journal of Coatings Technology and Research
·
2016
·Vol. 13
·期 4
·667-676
·
IF 1.342
Liao Mali,Sun Dongcheng
A series of ambient-temperature self-crosslinked waterborne polyurethanes denoted as WBPUs were successfully synthesized by incorporating a novel diol chain extender bearing two ketone groups, 2,2-bis(4-(2-hydroxypropoxy levulinate)phenyl)-propane (BHLPP), which was prepared using 2,2-bis(4-(2,3-epoxypropoxy)phenyl)-propane and levulinic acid, with 4,4-methylenedicyclohexyl diisocyanate, poly-neopentylene adipate glycol, and dimethylolpropionic acid. After post-adding adipic dihydrazide (ADH), self-crosslinking was achieved by the reaction between the ketone (–CO–) of BHLPP and the hydrazine (–NHNH 2 ) of ADH during film formation. For comparison, noncrosslinked waterborne polyurethane (WPU) without BHLPP and ADH was prepared. The structure of BHLPP was characterized by IR and NMR. The properties of the WPU and WBPU dispersions were investigated by measuring the stability, particle size, and morphology. The effects of the ratio of n (–NHNH 2 )/ n (–CO–) and the content of BHLPP were studied in terms of hardness, water resistance, solvent resistance, and thermal properties of WPU and WBPU films. The WBPU dispersions exhibited excellent stability, bimodal distribution, and regular spheroid morphology. The optimal ratio of n (–NHNH 2 )/ n (–CO–) for ketone–hydrazine self-crosslinking was 0.75:1. Importantly, the WBPU films showed superior hardness, water resistance, solvent resistance, and thermal properties to WPU film.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Na Zhang,Hongfa Yu,Wei Gong,Ting Liu,Nan Wang,Yongshan Tan,Chengyou Wu
To expand the application range of magnesium oxysulfate cement (MOSC) and the utilization of fly ash, the water resistance of MOSC mixed with low-calcium fly ash (L-FA) or high-calcium fly ash (H-FA) was studied. The softening coefficients and volume stability were tested to evaluate the water resistance of MOSC. The hydration products and microstructures of MOSC prepared without L-FA or H-FA (denoted as C) and MOSC prepared with L-FA (L-FM) or H-FA (H-FM) were characterized by quantitative X-ray diffraction (QXRD), mercury intrusion porosimetry (MIP), thermogravimetry (TG), and scanning electron microscopy (SEM). The results show that the expansion stress and the volume deformation caused by the transformation of residual MgO into Mg(OH) 2 are the main reasons for the decrease in the compressive strength of MOSC after its immersion in water. The formation of few 5·1·7 whiskers and the restraints on the expansion increase the compactness of the MOSC, which makes the compressive strengths and softening coefficients of C, L-FM and H-FM increase gradually with an increase in the immersion time. The softening coefficients of C, L-FM and H-FM immersed in water for 90 days are 0.97, 1.00 and 0.84, respectively. Although the softening coefficient of H-FM is not as good as that of C and L-FM due to the formation of CaSO 4 ·2H 2 O, the compressive strength and the compactness of H-FM immersed in water for 90 days are still higher than those of L-FM, which indicates that H-FA has good application prospects in MOSC.
研究领域:
建筑材料学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Zenghui Cheng,Ren Ye,Xiaoyu Shi,Chenhuan Lai,Shishuai Gao,Daihui Zhang,Yuzhi Xu,Chunpeng Wang,Fuxiang Chu
Wheat gluten (WG) shows great promise to synthesize environment-friendly wood adhesives. However, their weak bonding strength and poor water resistance have limited its application in the commercial wood-based panel industry. In this study, a novel WG-based adhesive was developed by constructing a multiple cross-linking network generated by covalent and non-covalent bonds. The potential mechanism was revealed by FT-IR analysis. Furthermore, their surface morphology, thermal stability , viscosity, and residual rate of adhesives with different compositions were systematically characterized and compared. The results showed that the hydrogen bonding, reactions between amine groups and tannin , and ring opening reaction of epoxy, synergistically contributed to generate a highly crosslinked network. The wet/boil water strength of the plywood prepared from WG/tannin/ethylene imine polymer (PEI)-glycerol triglycidyl ether (GTE) adhesive with the addition of 15 % GTE could reach 1.21 MPa and 1.20 MPa, respectively, and a mildew resistance ability was observed. This study provides a facile strategy to fabricate high-performance plant protein-based adhesives with desirable water resistance for practical application.
研究领域:
材料科学
·
林业工程
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ying Zhu,Ruohong Bian,Yang Yu,Jiongjiong Li,Cheng Li,Yan Lyu,Xiaona Li,Jing Luo,Jianzhang Li
The conversion of industrial lignin into wood adhesives offers a solution to issues related to formaldehyde pollution and the reliance on petrochemical resources of traditional formaldehyde-based resins, while promoting environmental and energy sustainability. However, conventional methods for preparing lignin-based adhesives generally involve the use of materials like formaldehyde, organic solvents, and costly epoxy, hindering their industrial application. This study introduces a novel approach for producing eco-friendly lignin-based wood adhesives using aminated lignin-Cu nanoparticles. The lignin-Cu nanoparticles were synthesized in water as a single solvent through a sedimentation method. Amination modification was achieved by grafting amino-terminated hyperbranched polyamide onto the nanoparticles via a Schiff base reaction. The prepared adhesive demonstrated a remarkable bonding strength of 1.51 MPa and debonding work of 0.272 J, which were 2.75 and 6.33 times higher than those of the pure lignin adhesive, respectively. Moreover, the adhesive exhibited improved water resistance with a wet shear strength of 1.15 MPa and sustained mildew resistance for approximately 100 days. Notably, this adhesive was synthesized without the use of formaldehyde, phenol, acids, or organic solvents, minimizing reliance on fossil resources and lowering costs compared to many formaldehyde-based and biomass adhesives. This research opens up new avenues for the efficient utilization of industrial lignin and the production of formaldehyde-free, environmentally friendly adhesives, which holds significant promise for energy conservation, emission reduction, and sustainable development within the wood-based panel industry.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 39
·e52936
·
IF 3.057
Yingyi Ma,Zian He,Ziwei Liao,Yuhang Han,Junming Zhang,Min Zhu
The dimensional and property stability after heating is considered to be one of the most important properties for low-dielectric-constant materials. Herein, porous structure contained composite PI film with porous PI structure on the surface of a flat PI film was prepared through the simple and low-cost microemulsion method. The introduction of porous coating can significantly improve the dielectric and water resistance properties of PI film, while maintaining its good mechanical properties. More importantly, the porous structures were well preserved after heating, but with the remove of surfactant layer on the inner surface of the pores, leading to lower dielectric constants with 1.06%–3.50% of reduction and lower dielectric losses less than 0.015 with the maintenance of good water resistance and mechanical properties. Excellent durability of the low dielectric constants and low dielectric losses upon high humidity were also shown for the heated composite PI film. In addition, the morphology and properties of the composite PI film both before and after heating could be controlled through varying the fabrication conditions. These results provide valuable information for the construction of the thermally stable low-dielectric-constant material.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Jiaqi Zhang,Ruixue Zhai,Jingshu Zhang,Jiawei Li,Chengyu Hong,Yiping Xu,Chao Zhou
Due to the increased presence of hydrophilic groups in waterborne polyurethane (WPU) coatings, consequently leading to compromised corrosion resistance and reduced service life. To solve the problem, a series of waterborne polyurethanes were synthesized via internal emulsification using dicyclohexylmethane diisocyanate (HMDI) and polytetrahydrofuran ether diol (PTMG) as the primary raw materials. The triethanolamine (TEOA) was used as a crosslinking agent and corrosion inhibitor, while N- (β-aminoethyl) -γ-aminopropyl trimethyl-(ethyl) oxy-silane (KH-792) was introduced as a coupling agent to establish a system with a dual crosslinking structure. The crosslinking degree of the double network structure can be adjusted by changing the amount of KH-792. Then the influence of KH-792 content on the performance of SWPU dispersions and film were studied. The research shows that the waterborne polyurethane with a KH-792 content of 3 wt% exhibits exceptional mechanical strength, reaching 34.64 MPa, with only 3.32 % water absorption and an adhesion strength of 2.64 MPa. Furthermore, it exhibited a high impedance modulus (2976.4 Ω/cm 2 ) at low frequencies. Therefore, this compound holds promising potential for application in anti-corrosion coatings field.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Peipei Yang,Songwei Li,Chuntai Liu,Changyu Shen,Xianhu Liu
It is a challenge to improve the adsorption performance and service life of graphene oxide (GO) composite by introducing a macromolecular to manipulate the interlayer of GO to form a good water-endurable by intercalation. By virtue of high reactivity of amino group in the cross-linked network formed by poly(acrylamide) (pAM) and N,N′-methylenebisacrylamide (MBA), the layer space of GO was manipulated to acquire more efficient uranium adsorption of GO. Furthermore, the amino group can also increase coordinative binding interactions via providing a secondary coordination sphere, which adjusts the electron density of composites to lower the overall charge on U(VI) and provides an additional point allowing hydrogen bond to align U(VI) in a satisfactory coordination style. Herein, a high adsorption capacity and water-endurable of GO-pAM-MBA was constructed by interface manipulation on GO surface. The U-uptake capacity of GO-pAM-MBA was 984.2 mg g −1 (4.14 mmol g −1 ) in aqueous solutions, which was 1.6 times than that of pristine GO under same environment. The resultant adsorbent achieved a high adsorption amount of 5.42 mg g −1 in real uranium mine wastewater. Furthermore, GO-pAM-MBA displayed good water-endurable even after six cycles. Overall, the adsorption performance indicated that the GO-pAM-MBA was an excellent appropriate adsorbent for extracting uranium.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Yuliang Zhang,Leishan Shao,Bin Liu,Fei Wang,Yinghan Wang
In the present work, polyester waterborne polysulfide-based polyurethane (WSPU) films were successfully synthesized from liquid polysulfide(PSF), poly(butylene adipate) (PBA) and isophorone diisocyanate (IPDI). The effect of PSF molecular weight on the chemical structures, mechanical and thermal properties of the resultant films were investigated by Fourier transform infrared (FTIR) spectroscopy, tensile test and Thermogravimetric analyzer (TGA). As the molecular weight of PSF increased, microphase separation was enhanced to some extent, resulting into an enhanced mechanical behavior and thermal stability. Meanwhile, with the increase in molecular weight of PSF, water resistance investigated by means of water uptake and mechanical behavior analysis was enhanced in general. Chemical resistance to organic solvents was also improved. When the molecular weight of PSF was about 5000, the water uptake and solvent swelling decreased to 2.83% and 95.1% respectively. The excellent performance may suggest a broader application in the surface material areas for WSPU films.
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
危险品化学品经营许可证（带存储）