POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Guoqiang Wang,Meichao Hou,Min Jiang,Rui Wang,Yin Liang,Guangyuan Zhou
A series of poly (propylene naphthalate-co-propylene 2,5-furandicarboxylate)s (PPNFs) were synthesized by the melt polycondensation method from 2,5-furandicarboxylic acid (FDCA), 2,6-naphthalenedicarboxylic acid (2,6-NDCA) and 1,3-propanediol (1,3-PDO). Their composition and sequence distribution were analyzed by 1 H NMR and 13 C NMR. Crystallization behaviors , thermal and mechanical properties were investigated. The weight-average molecular weights of PPN, PPF and PPNFs were higher than 28 000 g mol −1 and the polydispersity index was between 2.1 and 2.7. DSC and XRD results show that poly (propylene 2,5-furandicarboxylate) (PPF) and poly (propylene naphthalate) (PPN) are semi-crystalline polymers, but all PPNFs are amorphous polymers. With increasing the content of FDCA, the initial temperature of α-relaxation rose significantly. When the content of FDCA was 74 mol%, PPNF74 exhibited the high bio-based content (77.6 wt%) and good mechanical properties ( σ m = 71 MPa and ε b = 146%).
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
ZhangHe Wang,Chao Zeng,YuHao Wu,ChaoChen Xu,ShengMing Zhang,Peng Ji,ChaoSheng Wang,HuaPing Wang
Polyester (PET) has become the focus of research in the shrink film industry due to its good heat resistance, high transparency, and excellent mechanical properties. In order to improve the shrinkage rate of the film, amorphous PET (PETG) is usually obtained by copolymerization modification using some flexible diols and so on. However, introducing flexible structures reduces the glass transition temperature (Tg) and mechanical strength, and importantly, the gas barrier properties of most PETGs are weak. Here, a series of poly(terephthalic acid-naphthalene dicarboxylic acid-ethylene glycol-neopentyl glycol) (PENTN) were prepared by melt polymerization using different contents of 1,4-naphthalene dicarboxylic acid (1,4-NDA) or 2,6-naphthalene dicarboxylic acid (2,6-NDA). The results show that the introduction of 1,4-NDA does not enhance the Tg of the copolyesters significantly, whereas the Tg of the copolyesters increases linearly with the increase in the content of 2,6-NDA. The Tg of 2,6-PENTNs ranges from 82.2 to 90.5 °C. The crystallization is inhibited effectively due to the neopentyl glycol and exhibits good transparency (>85%) and low haze value (<4%), which results in the preparation of copolyesters that are all amorphous polymers. The differences in the effects of 2,6-NDA and 1,4-NDA on the thermal properties of the copolyesters were analyzed. Meanwhile, the copolyesters were prepared into films, and the gas barrier properties were analyzed in detail. The rheological analysis reveals the free volume of the copolyester is rapidly decreasing with the introduction of the naphthalene group structure. The gas barrier property of the copolyesters can be improved to a high level. This work provides an idea for the functionalized modification of packaging materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 10
·e53594
·
IF 3
Zejun Zhang,Fan Ye,Guosheng Ai,Huanyu Liu,Guanxin Zeng,Liwei Shen,Ying Yang,Huaikui Yuan,Xuening Feng,Yuanzhu Mi
A highly branched PNDC demulsifier with 2,6-naphthalenedicarboxylate as centronucleus was prepared by an efficient “one-pot” strategy. The product was characterized by FT-IR, 1 H-NMR, and TGA. The bottle test was performed to explore the effect of temperature, settling time, pH value, and concentration on the demulsification efficiency (DE). The DE reached an optimal value of 94.63% when the concentration of PNDC, settling time and operated temperature were 100 mg/L, 60 min and 70°C, respectively. Also, the DE could reach 91.58% when the concentration was only 20 mg/L at the same conditions. It showed that PNDC had an excellent performance in W/O emulsions with an extremely low concentration. Especially, PNDC could be used over a wide pH range (4–12) and high salinities, indicating that it had a good salt, acid and alkaline tolerance. In addition, the interfacial tension (IFT), surface tension (SFT), elastic modulus and micrograph analysis were carried out to investigate the possible mechanism. This work provides a highly branched demulsifier with high DE for the demulsification of stable W/O emulsions.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2021
·
IF 1.751
Han-Qi Luo,Meng-Ye Xu,Li-Wen Ding,Qing-Yan Liu,Yu-Ling Wang
Three cadmium(II) coordination polymers constructed from 5,7-disulfonate-1,4-naphthalenedicarboxylate and N-containing ligands, {[Cd2(DSNPDC)(phen)(H2O)4]·2.5H2O}n (1), {[Cd2(DSNPDC)(phen)2(H2O)4]·3H2O}n (2) and [Cd2(DSNPDC)(bpy)2(H2O)4]n (3) (H4-DSNPDC = 5,7-disulfonate-1,4-naphthalenedicarboxylic acid, phen = 1,10-phenanthroline, and bpy = 2,2′-bipyridine), were synthesized and characterized. Compound 1 displays a two-dimensional (2D) layered structure. In 2 and 3, the dinuclear [Cd2(COO)2] units are connected by DSNPDC4– ligands to generate one-dimensional (1D) chains. Due to the presence of the terminal chelating phen/bpy ligands, all compounds show low dimensional structures. Compounds 1–3 exhibit fluorescence emissions centered at 378, 419 and 376 nm, respectively, which are assigned to ligand-centered emissions or ligand-to-metal charge transfer.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 22
·4477-4487
·
IF 5.958
Xiang-Ling Lin,Bin Chen,You-Ren Huang,Kai-Yue Song,Pan-Ke Zhou,Lu-Lu Zong,Hao-Hong Li,Zhi-Rong Chen,Rong Jiang
The design of single-component broadband photoemitters with high stability is imperative for the development of next-generation WLEDs. In this work, 1D cationic haloplumbate chains and rigid luminescent naphthalene dicarboxylate (2,6-ndc) with a larger conjugated system were used to construct crystalline single-component broadband photoemitters, i.e. formulated as [(Pb4X2)(ndc)4·A2]n (X = Cl, Br, and I, A = (CH3)3NH+ and (CH3)2NH2+). These hybrids are 3D networks built from flexible 1D cationic (Pb4X2)6+ chains and rigid 2,6-naphthalene dicarboxylic acid ligands. The variation of halogen atoms from Cl to Br/I with higher polarity can switch the holo-directed geometry to the hemi-directed geometry with different distorted degrees. The larger conjugated system of 2,6-ndc leads to strong individual blue adsorptions and emissions. In particular, the Br- and I-analogues with hemi-directed geometries can give rise to additional red emissions, corresponding to the presence of stereochemical activities of Pb centers. Consequently, Br- and I-analogues are white-light emitters containing red emissions stemming from deformable haloplumbate and blue emissions originating from luminescent naphthalene motifs. Interestingly, haloplumbate-based emissions are thermally tunable, and those of naphthalene are generally inactive to thermal stimulus. As a result, tunable emissions from blue/white to yellow can be achieved. The higher quantum yield of Br-analogues can be assigned to their worse haloplumbate connectivity, which can enhance the electron–phonon coupling. In all, the combination of flexible haloplumbate chains with larger π-conjugated fluorophores is an efficient strategy for the construction of tunable broadband photoemitters.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Lejian Chen,Shuangfu Wang,Yudong Li,Weizhen Sun,Ling Zhao
2,6-Naphthalenedicarboxylic acid (2,6-NDA) is an important monomer for high-performance polyester materials. In this work, 2,6-NDA was prepared through liquid phase oxidation of 2,6-dimethylnaphthalene (2,6-DMN) using Co/Mn/Br as catalysts, acetic acid/water as solvents, and air as oxidant. The effects of catalysts, temperature, and water content on oxidation kinetics were investigated. Based on the free radical chain reaction mechanism, a simplified kinetic model was developed, which involves 2,6-DMN, 2,6-NDA, and other important intermediates. Model fitting results show that the kinetic model fits experimental data well under the conditions of various catalysts, temperatures, and solvent compositions. It was found that rate constants k2 through k9 regarding to chain propagation and termination are independent of catalyst and solvent compositions due to the absence of catalyst and water in these steps. These reaction steps show to be insensitive to temperatures within a certain range due to a very low reaction activation energy of the reactions between peroxy-radicals and α-carbon atoms. Hopefully, the model fitting results obtained in this work can provide valuable insights into the industrial reactor design and process optimization of the liquid phase oxidation of 2,6-DMN.
研究领域:
化学工程
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
Talanta Open
·
2023
·
IF 0
Xiao-Ye Shi,Shu-Jun Liu,Li-Qing Yu,Lan-Fen Li,Yun-Kai Lv
In this work, four metal-organic frameworks (MOFs) including DUT-4, DUT-8, IRMOF-8, and MIL-140B were synthesized using 2,6-naphthalene dicarboxylic acid as organic ligand and Al 3+ , Co 2+ , Zn 2+ , and Zr 4+ as metal centers, then coated on stainless steel wires as solid-phase microextraction (SPME) fiber coatings. Five aldehyde biomarkers (hexanal, heptanal, octanal, decanal, and nonanal) in exhaled breath of lung cancer patients were used as the target analytes, and extracted using four MOFs fiber coatings, followed by thermal desorption and quantitative analysis using GC–MS. The DUT-4 was found to be the most appropriate sorbent. The developed SPME-GC–MS method has large enrichment factors (877–1711), wide linear ranges (0.5–1000 μg L −1 ), and low detection limits (0.056–0.138 μg L −1 ). The relative standard deviation for six replicate cycles using one DUT-4 coated fiber were 2.0–7.7 % (intra-day) and 2.2–4.6 % (inter-day), respectively. The fiber-to-fiber reproducibility for three parallel prepared fibers was in the range of 3.7–13.7 % (RSD). The fabricated DUT-4 coated fiber can withstand at least 100 cycles of extraction/desorption/conditioning without significant loss of extraction efficiency and precision. The high enrichment factors of the DUT-4 coatings are attributed to the high specific surface area, unique porous structure, and abundant aluminum coordinated unsaturated metal sites of the DUT-4 material. Moreover, the 2,6-naphthalene dicarboxylic acid has two benzene rings with a 180° orientation, which not only increases the hydrophobicity of the MOFs material to avoid water molecules occupying adsorption sites and helps to form a rigid skeleton structure with a large number of functional adsorption sites on the surface, thereby improving the enrichment factor of target analytes. Ultimately, the developed DUT-4 coated SPME fibers was sucessfully used for the analysis of exhaled breath samples, and the recoveries for the spiked analytes were in the range of 89–105 %.
研究领域:
分析化学
·
医学诊断
·
材料科学
✓ 已验证
DOI
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
An Lin,Rui Lu,Xiaolin Luo,Lei Zhang,Fang Lu
Transformation of accessible and renewable biomass resources into functionalized chemicals and polymer monomers has been one of the significant research fields in biorefinery. The key bottleneck is the lack of green technologies to synthesize those products traditionally manufactured from fossil feedstock. Herein, a sustainable route for the synthesis of naphthalenedicarboxylic acid derivatives has been developed via an integrated process consisting of Diels–Alder, dehydroaromatization, and hydrogenation with lignocellulose-derived dimethyl trans, trans-muconate and p-benzoquinone as raw reactants. The Lewis acid sites of Sn-Beta with porous structure promoted the efficient Diels–Alder reaction, and the excessive p-benzoquinone induced the dehydrogenation of the cycloadduct to dicarboxylate-substituted naphthoquinone. A hydrogenation reaction under mild conditions has been conducted to produce dimethyl 5,8-dihydroxynaphthalene-1,4-dicarboxylate, and the overall yield could reach 50% based on the input amount of muconate via the two-step process. This work has exploited a template method to prepare the naphthalene ring product with multiple oxygen-containing functional groups and might also inspire more design thoughts on synthesizing green aromatic monomers.
研究领域:
绿色化学
·
可再生资源化工
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Nan Liu,Fahu Yang,Dong Liu,Fei Chen
Polyesters are extensively utilized across various fields due to their superior physical and chemical properties; enhancing the toughness of polyesters is currently imperative for extending their applications. In this study, a novel acrylate elastomer (BMHx) with controllable hydroxyl groups was designed to melt-blend with polyethylene naphthalene (PEN), to enhance the fracture toughness of PEN. The hydroxyl group in BMHx can effectively enhance the compatibility of PEN and BMHx, thus reducing the average particle size of BMHx to endow it to disperse in PEN more uniformly, leading to a high toughness PEN material. The tensile toughness of PEN/BMH10 can reach 4.01 MJ/m3, and the notched impact strength is 8.02 kJ/m2, which are 18 times and 3.8 times higher than that of PEN, respectively. These findings provide a new strategy to toughen the polyester and thus a general usefulness.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 33
·5655-5662
·
IF 3.545
Jianqi Yao,Xuzhao Li,Jing Lu,Qing Ma,Yongdong Liu,Faliang Luo
In this study, we synthesized a type of microcrystalline H-ZnOc with columnar structure by controlling the solubility of the reaction solution. Poly(ethylene 2,6-naphthalate) (PEN) and hexagonal zinc oxide column (H-ZnOc) composite materials were prepared by a twin screw extruder and the properties of the composites were characterized. The results showed that H-ZnOc has a remarkable nucleation effect on PEN, especially when the loading amount of H-ZnOc is 1.5 wt%; the nucleation efficiency is as high as 52.28%, and the crystallization temperature increased by nearly 23 °C. The crystal morphology changed, with the disappearance of the cold crystallization peak after the addition of H-ZnOc, the size of spherulites decreased and the number of spherulites increased. During the isothermal crystallization process, H-ZnOc significantly reduced the crystallization time of PEN. The impact strength of PEN increased from 1.86 kJ m−2 to 2.73 kJ m−2. Our results showed that H-ZnOc can be used as an effective nucleating agent for PEN, effectively improving the crystallization ability and mechanical properties, and its performance is comparable to the proprietary polymer nucleating agents NX8000, HPN68L, and TMB-5, etc.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yihuan Wang,Siqing Yuan,Guangji Wang,Zebin Fan,Jingwei Zhang,Zetong Li,Chenhua Liu,Dewen Zhao,Zhimin Chai,Xinchun Lu
Flexible transparent conductive electrodes (FTCEs) are essential components in emerging optoelectronics, including flexible displays, smart glasses/windows, organic solar cells, and electronic skins. The surface energy-directed assembly (SEDA) process, known for its capability to create high-resolution and high-fidelity patterns, has been utilized to fabricate TCEs on rigid glass substrates. However, the fabrication of FTCEs on flexible substrates remains comparatively underexplored. Here, we present the fabrication of silver patterns on polyethylene naphthalate (PEN) substrates using the SEDA process. A surface treatment process has been devised to render the PEN substrates hydrophobic, achieved through coating the substrates with fluorine-containing PyFlon films. This approach yields a significant improvement over silane-based self-assembled monolayer film-coated substrates, as it drastically diminishes surface roughness. Consequently, the contact angle hysteresis of the substrate surface is minimized, enabling the effective dewetting of the nanoparticle suspension. The incorporation of PyFlon films into the SEDA process has proven to be highly successful. Using this approach, we have successfully assembled functional patterns of various geometries and dimensions on PEN substrates, composed of silver nanoparticles, quantum dots, carbon nanotubes, silver nanowires, and gallium indium eutectic, with a high resolution down to 500 nm. The assembled silver line electrodes exhibit excellent transmittance (∼88%), low sheet resistance (7.12 Ω/□), and high mechanical stability, and their application in electroluminescent devices is showcased.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·
IF 2.5
Yang Hu,Xinming Pu,Jinggang Wang,Hongdong Zhang,Liping Yang
High performance copolyesters with ultrahigh glass transition temperature ( T g ) are crucial in emerging technology fields such as electronic devices, automotives, and coatings. In this paper, a series of poly(ethylene bis[4-(2-hydroxyethoxy) phenyl] sulfone 2,6-naphthalate) (PESNs) with high T g are synthesized by the copolymerization of 2,6-naphthalenedicarboxylic acid (2,6-NDA), bis[4-(2-hydroxyethoxy) phenyl] sulfone (BHEBS), and ethylene glycol (EG). The chemical structure and compositions of prepared copolymers are confirmed by hydrogen nuclear magnetic spectra ( 1 H NMR). T g of copolyesters (121.1–152.2 °C) depends on composition and is comparable to that of polyetheretherketone (PEEK: 143 °C), increasing as the amount of BHEBS units is increased. The Fox, Gordon–Taylor, and Kwei equations are employed to evaluate the variation of T g with respect to the composition of PESNs, respectively. In these three equations, the data calculated by Kwei equation fit the actual results best, attributed to the peculiar dielectric properties. In addition, PESNs show good solubility in 1,1,2,2-tetrachloroethane, DMF, and DMSO, which is conducive to meet the needs of polyester coating.
研究领域:
材料科学
·
高分子化学
✓ 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）