POLYMER DEGRADATION AND STABILITY
·
2016
·
IF 3.12
Mei Wang,Jianling Xia,Jianchun Jiang,Shouhai Li,Kun Huang,Wei Mao,Mei Li
A novel liquid Ca/Zn thermal stabilizer was synthesized from tung-maleic anhydride (TMA) as feedstock and evaluated for its stabilizing effects on poly (vinyl chloride) (PVC). First, N -(3-amino-benzoic acid) tung-maleamic acid (ABTMA) was prepared from the ammonolysis of TMA and para -aminobenzoic acid (PABA). Then its complex calcium salt (ABTMA-Ca) and zinc salt (ABTMA-Zn) were synthesized through a one-step method, and investigated by Fourier transform infrared spectroscopy and elemental analysis . ABTMA-Ca and ABTMA-Zn were separately treated with diethylene glycol monobutyl ether at 120 °C for 3 h to form liquid ABTMA-Ca (LABTMA-Ca) and liquid ABTMA-Zn (LABTMA-Zn). The effects of LABTMA-Ca/LABTMA-Zn, CaSt 2 /ZnSt 2 and C36DA-Ca/C36DA-Zn on thermal stability of PVC were studied through Congo Red test, discoloration tests and dynamic thermal stability analysis. The LABTMA-Ca/LABTMA-Zn thermal stabilizer exhibit excellent long-term stability. Analysis of tensile and dynamic mechanical properties shows PVC samples stabilized with LABTMA-Ca/LABTMA-Zn and the other two Ca/Zn systems all display comparable strength , modulus and glass transition. A common stabilizing mechanism of LABTMA-Ca/LABTMA-Zn system and its radical mechanism were presented, respectively.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ya-Nan Feng,Fei-Fan Wang,Weiwei Xiao,Yan Xia,Bin Wei,Shuaihua Wang,Zhonghua Deng,Fei-Fei Chen,Lingyun Li,Yan Yu
In this study, divalent calcium cation with large radius and trivalent yttrium cation with small radius were introduced to develop co-stabilized zirconia ceramics with both superior mechanical properties and aging resistance. Through a reverse coprecipitation-hydrothermal method, a series of ultrafine x CaO- y Y 2 O 3 -ZrO 2 ( x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0 ) raw powders with high quality were fabricated for the production of nanostructured ceramics via low-temperature pressurelessly sintering. The sintering process was optimized by investigating the effects of sintering temperature on densification, grain growth and phase evolution. The minimally doped 2.0 CaO- 0.5 Y 2 O 3 -ZrO 2 ceramic retained pure tetragonal phase at room temperature, achieving a balance of excellent toughness and high aging resistance. The impacts of chemical composition on microstructure, hardness, toughness and aging resistance were examined for these x CaO- y Y 2 O 3 -ZrO 2 ( x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0 ) ceramics. The segregation of calcium and yttrium cations at grain boundaries effectively tailored the microstructure. It was observed that substituting small trivalent yttrium cations for large divalent calcium cations effectively enhanced the aging resistance without sacrificing mechanical properties, due to the strengthened grain boundaries and asymmetrical distribution of cations among grains. This work not only produces low-doped zirconia ceramics with both excellent mechanical properties and aging resistance, but also presents straightforward method for preparation of high-quality raw powders and delicate microstructural engineering during sintering for developing advanced structural ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Biao Ma,Xu Wang,Songyan Lu,Huiwen He,Meng Ma,Yanqin Shi,Si Chen
An effectively Zn/Zn stabilizer system instead of traditional Ca/Zn stabilizer system was put forward, which contained a new triazole-based zinc-containing complex (abbreviated as [Zn(ttr)(St)]) and Zinc stearate (ZnSt 2 ). Without Ca soap in the system, [Zn(ttr)(St)] itself could effectively absorb HCl and provided PVC with higher transparency and better thermal stability without “zinc burning” than commercial CaSt 2 /ZnSt 2 stabilizer system, verified by Congo red tests and discoloration tests and dynamic thermal stability analysis. In addition, [Zn(ttr)(St)] could further delay “zinc burning” of other zinc soaps, constituting Zn/Zn stabilizer system. This is attributed to the strong ability of restricting ZnCl 2 of 3-amino-1,2,4-triazole released from [Zn(ttr)(St)] after absorbing HCl. After adding ESBO , PVC stabilized by [Zn(ttr)(St)]/ZnSt 2 /ESBO showed excellent transparency and thermal stability. We believe that [Zn(ttr)(St)] can act as a novel double agent with the stabilization effects of zinc soap and calcium soap at the same time and this Zn/Zn stabilizer system may inaugurate a new stabilizer system for PVC with synergistic effect.
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
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Jianxiang Feng,Yulin He,Xuemei Zeng,Benhao Xiang,Shuyi Chen,Pu Shi,Yuejun Liu
Due to biophenol being inherently antioxidant inefficient and cost intensive, it has no choice but to modify its chemical structure for large-scale applications. Cardanol-heterocyclic amines (BAOs) were prepared by a two-step method based on the intramolecular synergistic antioxidant effects of cardanol and nitrogen-containing heterocycles. Their thermal properties and antioxidant and photostability properties in polylactic acid (PLA) were analyzed. The cardanol-heterocyclic amines exhibited high initial decomposition temperatures as high as 380 °C. In addition, with the addition of 1% content of them to PLA, the tensile strength retention rate remained at 35% after 48 h of photoaging, which was 2–2.5 times higher than that of commercial antioxidant butylated hydroxytoluene (BHT) and remained at 67% after 144 h of thermal-oxidative aging, which was about 2 times higher than that of BHT. Among four cardanol-heterocyclic amines, BAO4 possessed superior photostability and antioxidant properties, presenting an intramolecular synergy between OH, N, and S.
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
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Mingyang Du,Zhigang Sun,Zengnan Liu,Yue Yang,Ziyuan Liu,Yexuan Wang,Bin Jiang,Zhibiao Feng,Chunhong Liu
Salted duck egg white (SDEW) is difficult to convert into high-value products for the high salt content and unpleasant odor, which leads to the loss of high-quality protein resources. In this work, for the first time, the freeze-thaw treatment was used for protein desalination to achieve complete desalination of SDEW. After SDEW prepared into hydrogel by microwave-assisted hydrothermal (125 °C, 500 W) in only 12 min, repeated freeze-thaw treatments made the hydrogel porous at the molecular level from the inside, which accelerated the outward migration of salt, thereby increasing the desalination efficiency. After ultrasonic dispersion, completely desalted SDEW, as a food-grade Pickering emulsion stabilizer, can stabilize Pickering emulsion at a particle concentration of 0.5–3.0%, oil phase fraction of 0.20–0.80 and pH value of 3.0–11.0 for at least 28 days. Overall, the findings provide a novel, simple and efficient method for SDEW desalination, and confirm that desalted SDEW is a low-cost but efficient food-grade Pickering emulsion stabilizer, which extend the potential commercial applications for SDEW in food industry.
研究领域:
食品科学
·
蛋白质工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 4
·1529
·
IF 4.6
Zhixiang Wang,Wentao Liu,Guohu Li,Jiacheng Wang,Bin Zhao,Peishan Huang,Wenjie Mei
Herein, two novel ruthenium(II) complexes coupled by erianinviaa flexible carbon chain, [Ru(phen)2(L1-(CH2)4-erianin)](ClO4)2(L1= 2-(2-(tri-fluoromethyphenyl))-imidazo [4,5f][1–10]phenanthroline (1) and [Ru(phen)2(L2-(CH2)4-eria)](ClO4)2(L2= 2-(4-(tri-fluoromethyphenyl))-imidazo [4,5f][1,10]phenanthroline (2), have been synthesized and investigated as a potential G-quadruplex(G4) DNA stabilizer. Both complexes, especially 2, can bind toc-mycG4 DNA with high affinity by electronic spectra, and the binding constant calculated for 1 and 2 is about 15.1 and 2.05 × 107M−1, respectively. This was further confirmed by the increase in fluorescence intensity for both complexes. Moreover, the positive band at 265 nm in the CD spectra ofc-mycG4 DNA decreased treated with 2, indicating that 2 may bind toc-mycG4 DNA through extern groove binding mode. Furthermore, fluorescence resonance energy transfer (FRET) assay indicated that the melting point ofc-mycG4 DNA treated with 1 and 2 increased 15.5 and 16.5 °C, respectively. Finally, molecular docking showed that 1 can bind toc-mycG4 DNA in the extern groove formed by base pairs G7–G9 and G22–A24, and 2 inserts into the small groove ofc-mycG4 DNA formed by base pairs T19–A24. In summary, these ruthenium(II) complexes, especially 2, can be developed as potentialc-mycG4 DNA stabilizers and will be exploited as potential anticancer agents in the future.Keywords:ruthenium(II) complexes;erianin;c-mycG-quadruplex DNA;stabilizer
研究领域:
生物化学
·
药物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2022
·Vol. 29
·期 2
·343-355
·
IF 2.297
Wenshuo Zhang,Huiyun Xia,Lifang Song,Huiwen Huo,Changjie Lu,Yihan Sun,Yanhui Niu
In order to improve the deficiency of traditional polyvinyl chloride (PVC) heat stabilizer, triazole-based zinc-containing complex (abbreviated as [Zn(ttr)(OAc)]) with good compatibility with PVC and a strong ability to absorb HCl was prepared in this paper, which was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM) and thermogravimetric analysis (TGA). PVC sheets were prepared by mixing PVC with composite heat stabilizer (DAJ) composed of [Zn(ttr)(OAc)] and 1,3-dimethyl-6-aminouracil (DAU). Different kinds and amounts of common auxiliary heat stabilizers were selected and added to the DAJ system to study the effect of thermally stable system on PVC by Congo red test, Discoloration test, Dynamic thermal stability test, SEM, TGA and Transmittance test and the relevant mechanism was explored. The PVC sheets with DAJ blended by 1.2 phr DAU and 0.8 phr [Zn(ttr)(OAc)] showed relatively excellent coloring properties, long-term thermal stability, and high light transmittance. Compared with dibenzoylmethane (DBM), 0.5 phr sorbitol and 1.5 phr epoxy soybean oil (ESBO)/Antioxidant 168 showed good synergistic effect with DAJ. Due to the polyhydroxy nature of sorbitol, the thermal stability of PVC was significantly improved, and the transmittance of PVC benefited from the similar miscibility of ESBO long chain. This was also confirmed by TGA and SEM of PVC sheet.
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 VINYL & ADDITIVE TECHNOLOGY
·
2021
·Vol. 28
·期 4
·696-705
·
IF 1.993
Zhimin Fu,Zhanhong Yang,Lie Deng,Yao Rong,Jian Wu
The tris(hydroxymethyl)aminomethane (THAM) and its derivative (DHD 2-([1,3-dihydroxypropan-2-ylidene]amino)-2-(hydroxymethyl)propane-1,3-diol) have been used as organic thermal stabilizers for flexible poly(vinyl chloride) (PVC). According to dehydrochlorination and discoloration tests conducted at 180°C, THAM showed to be an excellent organic thermal stabilizer for flexible PVC, not only THAM stabilizer improved the thermal stability of PVC but also maintained the initial color of the PVC. The induction time and the thermal stability time were 52 and 55.5 min, respectively. DHD can also be used as an organic thermal stabilizer for flexible PVC; however, its thermal stabilizing efficiency was not satisfactory, but it has a good synergistic effect with traditional cadmium–zinc soap stabilizers. Besides, the experiments had been performed to investigate pentaerythritol (PER) and THAM, two substances with similar structure, but such a huge difference in thermal stabilizing efficiency for flexible PVC. THAM did improve the thermal stability of PVC, both in initial whiteness and long-term thermal stability. But PER has no thermal stabilizing efficiency for PVC when used alone. At the end of the article, the probable mechanism which can give an explanation for the stabilizing efficiency given by the THAM has been proposed.
研究领域:
材料科学
·
高分子化学
·
热工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analysis and Testing
·
2017
·Vol. 2
·期 1
·90-97
·
IF 0
Wang Zhong-Xia,Li Qi-Le,Kong Fen-Ying,Wang Wei,Ding Shou-Nian
In this paper, dual-stabilizer-capped CdTe quantum dots were used as modulated photoluminescence (PL) sensors for the subpicomolar level detection of copper(II) (Cu 2+ ) and mercury(II) (Hg 2+ ) ions in aqueous solution for the first time. The dual-stabilizer-capped CdTe quantum dots were synthesized using mercaptopropionic acid (MPA) and sodium hexametaphosphate (SHMP) as surface-modified ligands via a convenient hydrothermal process. The researches showed a low interference response of the MPA-SHMP-capped CdTe quantum dots towards other metal ions. The highly efficient PL quenching ability in the presence of Hg 2+ or Cu 2+ ions due to the formed nonfluorescent metal complexes via robust Hg 2+ –O interaction with the carboxy oxygen elements of surface ligands of MPA, and on the basis of the competitive binding of the mercapto groups of the MPA between the CdTe quantum dots and the Cu 2+ ions, respectively, which allowed the analysis of Hg 2+ or Cu 2+ ions down to the picomolar levels. Under optimal conditions, the response of the MPA-SHMP-capped CdTe quantum dot PL intensity is linearly proportional to the Cu 2+ and Hg 2+ ion concentration ranging from 0.1 to 1000 and 0.3 to 1000 nM with a detection limit of 41.6 and 97.0 pM, respectively. The diagnostic capability and potential in practical applications of this method have been demonstrated by detecting Cu 2+ and Hg 2+ ions in environmental water samples.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
DOI
ACS Applied Nano Materials
·
2025
·
IF 5.5
Xinying Zhao,Kaiyuan Miao,Chiqing Chen,Guannan Yu,Zeyao Ouyang,Xueqing Xiang,Yan Meng,Xinyan Chen,Zhaohua Shi
Several challenges, including the high hydrophilicity of proteins, oxidation of oils, bacterial contamination, and the chemical assembly of protein particles, have limited the application and development of Pickering emulsions (PEs) stabilized by protein particles in fields such as food and pharmaceuticals. In this study, we utilized a physical mixing strategy to combine tannic acid (TA), a natural polyphenol renowned for its outstanding antioxidant and antimicrobial capabilities, with gelatin (Gel) and negatively charged hyaluronic acid (HA) to form ternary nanocomplexes (TGH). Our research indicates that the assembly of TGH is likely mainly driven by noncovalent interactions, such as hydrogen bonding, hydrophobic interactions, and electrostatic interactions. These interactions alter the secondary structure of Gel, thereby enhancing its hydrophobicity. Compared with the binary nanocomplexes composed of TA and Gel (TG), TGH exhibits a significantly smaller particle size, superior stability, and a contact angle closer to 90°. Moreover, the antioxidant activity of TGH surpasses that of vitamin C, a commonly used antioxidant. TGH demonstrates the ability to stabilize herring oil and various vegetable oils. Particularly, at a concentration of 1% (wt %), TGH showed the potential to produce high internal phase PEs, which have the property of not flowing when inverted. Compared with TG, TGH shows enhanced emulsifying efficacy in stabilizing herring oil, as evidenced by the smaller droplet size, network structure formed by TGH on the surface of oil droplets, and more solid-like rheological characteristics revealed through micromorphological and rheological studies. Importantly, TGH-stabilized herring oil (TGH-PEs) effectively inhibited the growth of Escherichia coli and Staphylococcus aureus, demonstrating significant antibacterial activity. Moreover, TGH-PEs retarded the light-induced oxidation of active ingredient β-carotene embedded in them. Conclusively, TGH has great potential as a stabilizer for PEs and holds promise for applications in the food and pharmaceutical industries.
研究领域:
食品科学
·
药学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Zhaohuan Li,Chaowen Chen,Yanhong Gao,Bingyao Wang,Dongfang Wang,Yue Du,Lichao Liu,Zhengyan Wu,Dongqing Cai
The biocrust formation by cyanobacteria inoculation is considered to be a substantial and promising biotechnology method for combating desertification. However, due to the harsh ecological environment in desert, it is difficult to form stable biocrust quickly on sand surface. Herein, we fabricated a network-structured nanocomposite as nano-sand-stabilizer (named as AC) using attapulgite (ATP) and carboxymethyl cellulose (CMC). The AC with abundant ‒COOH and ‒OH had a high retention water capacity and could bind sand particles together through netting effect, providing a stable and suitable microenvironment for growth of mixed cyanobacteria (MC). A one-year field experiment confirmed that synergistic effect of AC and MC could improve the soil nutrition content and microbial structure, which was beneficial for biocrust formation and sand fixation. Therefore, this study provides a new method for fast sand fixation and promoting the biocrust formation, which could achieve the goal of sustainable desert restoration.
研究领域:
生态学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2014
·Vol. 119
·期 1
·597-603
·
IF 2.206
Xu Xiaopeng,Chen Si,Wu Bozhen,Ma Meng,Shi Yanqin,Wang Xu
The influence of allantoin (ALL) combined with zinc stearate (ZnSt 2 ), calcium stearate (CaSt 2 ), and ZnSt 2 –CaSt 2 (1:1), respectively, in different mass ratios on thermal stability of poly(vinyl chloride) (PVC) was investigated by Congo red test, discoloration test, and thermogravimetric analysis. The results indicated that ALL behaved as a good long-term thermal stabilizer for PVC, which was attributed to its ability to absorb hydrogen chloride released from the degradation of PVC. Moreover, ALL was able to extend the stabilization time of PVC containing ZnSt 2 –CaSt 2 and postpone “zinc burning.” Fourier transform infrared spectra confirmed that ALL can react with ZnCl 2 to produce an inert complex, which is responsible for postponing “zinc burning.”
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）