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学者姓名：刘雪莲
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Abstract ：
A series of catalytic filters (Mn-Fe-CeOx/PPS) with satisfactory NO conversion and physical properties were synthesized by the redox method. The Mn-Fe-Ce ternary catalyst system and corresponding oxidation-reduction equation were established by using the low-valent oxidation characteristics of cerium and iron to react with high-valent manganese capable of reduction. Furthermore, the optimal catalytic filter synthesized under the guidance of reaction principles has excellent physicochemical properties such as high NO conversion (100 % at 180 degrees C), high stability, low loading capacity (66.8 g/m2), and strong binding ability, making it suitable for complex operating conditions. Particularly, in the Mn-Fe-Ce ternary catalyst system, the coexistence of Ce4+ and Ce3+ causes the formation of surface oxygen vacancies, uneven local charge distribution and additional chemisorbed oxygen, which are conducive to the low-temperature selective catalytic reduction (L-T SCR) reaction. Meanwhile, there are also high valence Mn4+ and Fe3+ in catalyst system, which can promote the oxidation of NO and further improve the L-T SCR reaction.
Keyword ：
L-T SCR reaction L-T SCR reaction Mn-Fe-CeOx/PPS catalytic filters Mn-Fe-CeOx/PPS catalytic filters NO conversion NO conversion Oxidation-reduction equation Oxidation-reduction equation Reaction principles Reaction principles
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| GB/T 7714 | Zhang, Yanbing , Wang, Xie , Liang, Banglei et al. An investigation on reaction principles of Mn-Fe-CeOx catalyst system: Guide the synthesis of low-temperature NH3-SCR catalytic filter [J]. | ENVIRONMENTAL TECHNOLOGY & INNOVATION , 2025 , 37 . |
| MLA | Zhang, Yanbing et al. "An investigation on reaction principles of Mn-Fe-CeOx catalyst system: Guide the synthesis of low-temperature NH3-SCR catalytic filter" . | ENVIRONMENTAL TECHNOLOGY & INNOVATION 37 (2025) . |
| APA | Zhang, Yanbing , Wang, Xie , Liang, Banglei , Ren, Haibo , Zhang, Xiaoxia , Liu, Xingye et al. An investigation on reaction principles of Mn-Fe-CeOx catalyst system: Guide the synthesis of low-temperature NH3-SCR catalytic filter . | ENVIRONMENTAL TECHNOLOGY & INNOVATION , 2025 , 37 . |
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Antistatic nylon-6 (PA6) composites have attracted considerable attention due to their tailored properties for electronics, textiles, and automotive applications. In this paper, the antistatic PA6 composites comprising with polypropylene (PP), aminated multi-walled carbon nanotubes (MWCNTs-NH2) and aminated carbon black (CB-NH2) were prepared by melt blending and compression molding. In the composite system, PP was used as the co-matrix to assist the phase separation of PA6. MWCNTs-NH2 and CB-NH2 were introduced as conductive fillers. All composites showed good thermal stability with the T5 % higher than 376 degrees C and the composites containing fillers showed higher residues after thermal degradation due to the good thermal stability of MWCNTs-NH2 and CB-NH2. The DSC and XRD results indicated that the crystallization properties of the composite materials were determined by PA6 and PP rather the conductive fillers. In general, the introduction of conductive fillers decreased the mechanical properties but effectively improved the conductivity of the composites and then the antistatic properties. Besides, the antistatic analysis and mechanical test denoted that MWCNTs-NH2 and CB-NH2 showed synergistic effect on improving the antistatic and mechanical properties of the composites, which was more evident at high MWCNTs-NH2 quantity. The micromorphologies obtained by SEM first confirmed the ductile fracture of these composites, and then disclosed a two-phase structure of PA6 and PP polymer matrix, where the conductive fillers were found in the PA6 phase. Considering both mechanical and antistatic properties, the composite (PCNB-3) containing both 3 phr MWCNTs-NH2 and CB-NH2 was proposed for the antistatic PA6 composite.
Keyword ：
Antistatic composites Antistatic composites Carbon nanomaterials Carbon nanomaterials Hybrid conductive fillers Hybrid conductive fillers PA6 PA6 Phase separation Phase separation
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| GB/T 7714 | Liu, Xuelian , Li, Qian , Zheng, Yuying et al. Polypropylene assisted phase separation nylon-6 antistatic composites: MWCNTs-NH2 and CB-NH2 as hybrid conductive nanofillers [J]. | POLYMER , 2025 , 328 . |
| MLA | Liu, Xuelian et al. "Polypropylene assisted phase separation nylon-6 antistatic composites: MWCNTs-NH2 and CB-NH2 as hybrid conductive nanofillers" . | POLYMER 328 (2025) . |
| APA | Liu, Xuelian , Li, Qian , Zheng, Yuying , Zheng, Weijie . Polypropylene assisted phase separation nylon-6 antistatic composites: MWCNTs-NH2 and CB-NH2 as hybrid conductive nanofillers . | POLYMER , 2025 , 328 . |
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In this article, several novel polyesters containing renewable 2,6-pyridinedicarboxyl aromatic units are synthesized by direct polycondensation. The obtained polyesters are chemically identified by Fourier transform infrared and proton nuclear magnetic resonance. Their average weight molar masses vary with the diol chain length, from Mw = 2 600 gmol-1 to Mw = 51 600 gmol-1. These polyesters exhibit high thermal stability with thermaldegradation temperatures (Tmax) ranging from 330 to 399 degrees C. Among them, the polyesters containing bicyclic diols (isosorbide IS and isomannide IM) are amorphous and show glass transition temperatures (Tg) up to 163 degrees C and 176 degrees C respectively. Besides, polyesters containing linear diols are semi-crystalline with melting temperatures (Tm) ranging from 110 to 189 degrees C. The semi-crystalline nature is verified by X-ray diffraction and polarized optical microscopy. These results disclose that 2,6-pyridinedicarboxylic acid (PDA26) is attractive as a bio-occuring molecule for preparing both high Tg and semi-crystalline polymers when finely choosing the diols.
Keyword ：
biopolymers biopolymers Dipicolinic acid Dipicolinic acid high Tg high Tg polyesters polyesters semi-crystalline semi-crystalline
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| GB/T 7714 | Liu, Xuelian , Lebrun, Laurent , Fatyeyeva, Kateryna et al. Bio-based polyesters derived from 2,6-pyridinedicarboxylic acid with tunable thermal and crystallization properties [J]. | JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY , 2024 , 62 (2) : 126-134 . |
| MLA | Liu, Xuelian et al. "Bio-based polyesters derived from 2,6-pyridinedicarboxylic acid with tunable thermal and crystallization properties" . | JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 62 . 2 (2024) : 126-134 . |
| APA | Liu, Xuelian , Lebrun, Laurent , Fatyeyeva, Kateryna , Desilles, Nicolas . Bio-based polyesters derived from 2,6-pyridinedicarboxylic acid with tunable thermal and crystallization properties . | JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY , 2024 , 62 (2) , 126-134 . |
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Driven by sustainable development and low-carbon policies, many high-performance bio-based polyesters are produced. Our previous work uncovered the high barrier but low thermal and mechanical properties of a renewable 2,6-pyridinedicarboxylic-based polyester. In this article, the copolymerization with isosorbide as a second diol is considered to ameliorate these properties. The chemical structures of copolyesters and the successful introduction of isosorbide were confirmed by FT-IR and 1H NMR. The 1H NMR spectra also allowed the calculation of isosorbide ratio in polymers. GPC revealed a decrease in molar masses with the increase of isosorbide ratio. Contact angle and water/gas permeation measurements disclosed an increase in hydrophilicity and water/gas permeability with the introduction of isosorbide. TGA and DSC analyses demonstrated an enhancement in thermal stability: 8 mol% of isosorbide to the total diol ratio increased the 5 % weight loss temperature (T5%) by 9 degrees C, the maximum weight loss temperature (Tmax) by 8 degrees C and the glass transition temperature (Tg) by 6 degrees C. DSC investigation showed that the incorporation of isosorbide significantly influenced the crystallization properties, particularly from the melt, by decreasing the crystallinity. XRD patterns indicated the presence of similar crystallization units in these polyesters. Tensile test revealed that incorporating 8 mol% of isosorbide greatly improved the mechanical properties by doubling Young's modulus and tripling the strength at break. Such enhancement in thermal and mechanical properties is important for high gas barrier food packaging applications of these polyesters.
Keyword ：
Bio-based copolyesters Bio-based copolyesters Isosorbide Isosorbide Mechanical properties Mechanical properties Permeation properties Permeation properties Structure -property relationships Structure -property relationships Thermal properties Thermal properties
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| GB/T 7714 | Liu, Xuelian , Lebrun, Laurent , Desilles, Nicolas . Enhancing thermal and mechanical properties of pyridine-based polyester with isosorbide for high gas barrier applications [J]. | EUROPEAN POLYMER JOURNAL , 2023 , 202 . |
| MLA | Liu, Xuelian et al. "Enhancing thermal and mechanical properties of pyridine-based polyester with isosorbide for high gas barrier applications" . | EUROPEAN POLYMER JOURNAL 202 (2023) . |
| APA | Liu, Xuelian , Lebrun, Laurent , Desilles, Nicolas . Enhancing thermal and mechanical properties of pyridine-based polyester with isosorbide for high gas barrier applications . | EUROPEAN POLYMER JOURNAL , 2023 , 202 . |
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