POLYMER
·
2016
·
IF 3.586
Dandan Zhang,Dongqing Liu,Qingjuan Ren,Yingbo Chen,Cuiyu Yin
Benzenesulfonic group containing polyamide-6 (PA6) were fabricated through melting polymerized using ε-caprolactam and different proportions of 5-sulphosalicylic acid (5SA). The physicochemical properties of SO 3 H containing PA6s (SPA6) were determined through FT-IR spectroscopy, TGA and DSC . The morphology of electrospinning fibers of SPA6s were investigated by FE-SEM. Fiber diameters increased with 5SA, and the polymer became un-electrospinnable as 5SA up to 5 wt%. Solution conductivity was a crucial factor for the spinnability of polyelectrolyte . Direction of electric field and material quality of collector could also influence the electrospinning of polyelectrolyte. Sulfonic groups preferred to distribute over the surface of fibers during electrospinnning process comparing to melting spinning, which could render fiber surface more hydrophilic.
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
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 19
·2859-2868
·
IF 8.683
Ming Liu,Ran Cen,Ji-Hong Lu,Tie-Hong Meng,Chun-Rong Li,Carl Redshaw,Timothy J. Prior,Zhu Tao,Xin Xiao
Fluorescent nitrogen and fluorine doped carbon dots (CDs) were prepared by a hydrothermal method using levofloxacin (LVFX) and cucurbit[6]uril (Q[6]) as the nitrogen and carbon sources, respectively. Decomposition of LVFX occurred at elevated temperature affording N,N′-desethylene levofloxacin hydrochloride (N,N′-DLH). The crystal structure of the resulting inclusion complex N,N′-DLH@Q[6]·[CdCl4]2(H3O)·9H2O was determined, where N,N′-DLH is protonated on each of the terminal nitrogens and the quinone functionality is a quinol which forms an intramolecular hydrogen bond to the carboxylic acid. The synthesized N,N′-DLH containing Q[6]-CDs emitted intense blue fluorescence with high photostability and exhibited stability at high ionic strength. In particular, the original rigid macrocyclic skeletons of these hosts were retained during the fabrication process, which helps in uniquely distinguishing them from other reported CDs. Meanwhile, the performance of the Q[6]-CDs was characterized using fluorescence and NMR spectroscopies. Subsequently, using the obtained Q[6]-CDs, an efficient sensing method for L-tryptophan (L-Trp) and capecitabine (CAP) has been developed based on macrocyclic host–guest chemistry. Under applicable conditions, the detection limits for L-Trp and CAP were calculated to be 5.13 × 10−8 M and 1.48 × 10−8 M, respectively.
研究领域:
分析化学
·
材料科学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 4
·1-7
·
IF 1.81
Cao Renping,Shao Wenhua,Zhao Yanshu,Chen Ting,Ao Hui,Guo Siling,Liu Pan,Fan Ting
CaTi 4 (PO 4 ) 6 : x Eu 3+ phosphors are successfully synthesized under air condition by high-temperature solid-state method. The crystal structure, morphology, energy spectrum, atomic percentage, elemental mapping, and luminescence properties are investigated, respectively. Monitored at 594 nm, the excitation spectral bands of CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor in the range of 210–550 nm are assigned to the O 2− –Eu 3+ charge transfer band (CTB) and the 7 F 0 → 5 H 3 , 5 L 7 , 5 L 6 , 5 D 1 , 5 D 2 , 5 D 3 , and 5 D 4 transitions of Eu 3+ ion. With excitation at 394 nm, CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor emits orange-red light with the chromaticity coordinates (0.548, 452), and the emission spectral bands in the region from 575 to 720 nm are attributed to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. The optimal doping concentration of Eu 3+ ion is ~ 8 mol%. The lifetime of CaTi 4 (PO 4 ) 6 :Eu 3+ phosphors decreases from 1.87 to 0.97 ms with increasing Eu 3+ concentrations from 1 to 10 mol%. CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor has a good thermal stability. The experimental results indicate that CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor has an application prospect in white light-emitting diodes (LEDs) based on the near ultraviolet (~ 394 nm) LED chip.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2013
·Vol. 35
·期 4
·627-635
·
IF 1.482
Lei Xia,Baoqing Shentu,Zhixue Weng
The effect of dendrimer-like polyamidoamine grafted attapulgite (ATP-PAMAM) on the microstructure and morphology of Nylon-6 (PA6) was investigated. The ATP-PAMAM nanoparticles were prepared by treating attapulgite (ATP) with heat and acid followed by grafting with polyamidoamine (PAMAM) molecules, which was confirmed by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and dispersion state in formic acid. The X-ray diffraction (XRD) analysis result indicated that the grafting modification was occurred on the surface of fibrous crystals and did not shift the crystal structure of ATP. PA6/ATP-PAMAM (G 2.0 ) nanocomposites with different modified ATP content were prepared by melt compounding in a twin screw extruder. XRD measurements suggested that the intensity of diffraction peak of α crystalline form of PA6 decreased gradually as the inclusion of ATP-PAMAM(G 2.0 ) into the PA6 matrix, while that of γ crystalline form increased gradually. The results of molau experiment and scanning electron microscopy (SEM) observation showed not only a uniform dispersion of ATP-PAMAM(G 2.0 ) in the PA6 matrix but also a strong interfacial adhesion between them. Mechanical investigation (by tensile test) showed an obvious improvement in the presence of surface modified ATP. POLYM. COMPOS., 35:627–635, 2014. © 2013 Society of Plastics Engineers
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
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Runqing Liu,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
KBe2BO3F2 (KBBF) is the sole nonlinear optical (NLO) crystal that can practically generate deep-ultraviolet (UV) coherent light by a direct second-harmonic generation (SHG) process. However, the toxic BeO and crystal layer habit limit its application. With this background, a new beryllium-free borate, K5Mg2La3(BO3)6 (KMLBO), has been designed and synthesized through a high-temperature solution method. KMLBO crystallizes into the noncentrosymmetric space group P31m (No. 157) and features a three-dimensional framework structure consisting of alveolate [LaBO3]∞ layers further tightly bound via interlayer [BO3]3– groups. KMLBO not only exhibits desirable performances including deep-UV transparency, large SHG (∼3.1 × KH2PO4), and phase-matchability but also overcomes the crystal layer habit of KBBF, demonstrating that it is a potential deep-UV NLO crystal.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Wenwen Wang,Aisen Jiang,Hao Zhang,Junjie Wang,Xiaoguang Li,Congang Fu,Xiaohan Yang,Ke Liu,Dong Wang
The growing demand for polymeric materials has encouraged industries and the academic community to develop materials with improved mechanical properties, particularly those that can be used in various fields. Polyamide 6 (PA6) is a versatile engineering plastic material with various advantageous properties; however, improving its toughness and hydrophobicity is conducive to expanding its application. In this work, α, ω-aminopropyl-terminated poly(methyltrifluoropropylsiloxane) prepolymer (APMFS) was synthesized for its outstanding flexibility and hydrophobicity. It was then covalently incorporated into a PA6 backbone through straightforward large-scale melt polymerization. The functionalized PA6 exhibited the highest breaking strength and toughness of approximately 59.6 MPa and 426.3 MJ/m3, respectively. Moreover, the impact strength of PA6-APMFS reached 63.7 kJ/m2, more than twice that of conventional PA6. The water contact angle was measured at its highest, 94°, with water absorption reduced to 0.5 wt %. Microfibers exhibited a very low wicking height of 7.5 cm. Subsequently, functionalized nanofibrous membranes and foams were applied for self-cleaning, oil/water separation, and thermal insulation, showcasing excellent potential for protective and water purification applications. This work illustrates the multifunctional application advantages of modified PA6.
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
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Wen Xia,Yu-Mei Nie,Na Lei,Zhu Tao,Qiang-Jiang Zhu,Yun-Qian Zhang
The esterification reaction used to prepare butyl paraben (BP) and propyl gallate (PG) catalyzed using a cucurbit[6]uril-supported Keggin-type silicotungstic acid (Q[6]-STA) catalyst has been investigated. The Q[6]-STA catalyst has been characterized using FTIR spectroscopy, XRD, SEM, EDS, thermal analysis, and surface area studies. Q[6]-STA was easy to prepare in high yield and exhibited some advantageous properties, such as high catalytic activity and its convenient recovery. Moreover, a reusability study showed that the Q[6]-STA catalyst was stable and active.
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
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2018
·
IF 1.712
Chongwen Jiang,Jundong Zhu,Bing Wang,Lu Li,Hong Zhong
Zirconium doped mesoporous KIT-6 samples with different Si/Zr ratios were synthesized by the direct hydrothermal method. Various characterization techniques confirm that highly distributed ZrO 2 nanoparticles and multi-coordinated Zr 4+ species are incorporated in the mesoporous composites. One-pot synthesis of 5-hydroxymethylfurfura(HMF) from glucose was examined in the presence of Zr-KIT-6(20) the molar ratio of Si to Zr is 20 under aqueous system. The effects of temperature, reaction time, catalyst dosage and biphasic solvent system on the conversion of glucose and the HMF yield were investigated. It was found that the glucose conversion and the HMF yield have been improved from 54.8% to 79.0% and from 19.5% to 34.5% in the biphasic MIBK-water system, respectively. Both the acidity of Zr-KIT-6(20) and the biphasic MIBK-water system are responsible for the improved performance of glucose dehydration to HMF.
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2012
·
IF 3.628
Jun Huang,Wan-wen Chen,Sheng Hu,Jing-Yan Gong,Hong-Wu Lai,Peng Liu,Le-he Mei,Jian-wei Mao
TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated 6-carboxy β-chitin derivatives (T-chitin) with different carboxylate content were successfully synthesized by controlling the addition level of NaClO as the primary oxidant. The structural and biochemical properties of the derivatives were investigated. The carboxylate contents of the derivatives calculated by electrical conductivity titration were 1.33, 1.68, 1.80, and 2.08 mmol/g, respectively. The yield of T-chitin with carboxylate content of 2.08 mmol/g reached 74.55%. T-chitin exhibited stronger bile acid binding capacities than that of β-chitin. The scavenging ability of T-chitin against hydroxyl radicals improved with increasing concentration, and EC 50 values were below 1.2 mg/mL. All T-chitin exhibited a strong ferrous ion chelating effect. At 8 mg/mL, the chelating effects of T-chitin with carboxylate content of 0.81 mmol/g reached 80.15%. These results showed that T-chitin had good bile acid binding capacity and antioxidant activities and it may be a potential antioxidant in vitro .
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Yang Liu,Guodong Cao,Xuelong Zhu,Yi Zhang,Chenglu Liang,Yukun Chen
Upcycling the wasted polyamide 6 (PA6) to its monomer caprolactam via depolymerization is a promising way to build the resource cycling and alleviate the environmental pollution. High efficient catalyst for PA6 depolymerization is desirable and crucial. Herein, a sulfonated Fe-MOF catalyst was designed and performed as solid acid catalyst for the PA6 depolymerization for the first time. Results showed that a 100% conversion of PA6 solid to water-soluble liquid products can be achieved at temperatures of 250°C after only 1-h reaction. LC/MS results indicated that the water-soluble products were mainly composed of caprolactam and their oligomers. Without catalyst, nearly no water-soluble products can be obtained at the same condition. Moreover, a high selectivity of 90% caprolactam production in the water-soluble liquid products was achieved at 260°C, 5 h. The reaction rate constants at 240°C, 250°C, and 260°C were determined to be 0.024, 0.033, and 0.064, respectively, with a Ea value of 101.8 kJ/mol, showing positive temperature dependent relationship. The comparison of catalytic performances over sulfonated Fe-MOFs, FeCl 3 ·6H 2 O and the pristine un-sulfonated Fe-MOF suggested the synergistic contribution of Fe sites (Lewis acid centers) and the sulfonic acid sites to the catalytic performances. Graphical Water soluble liquid products (100 wt.%) with a high selectivity of 90% caprolactam can be achieved by the addition of Fe-MOF catalyst under a mild condition through the synergistic catalytic contribution of Fe sites (Lewis acid centers) and the sulfonic acid sites.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Yufei Liu,Yikai Zhan,Min He,Chengjun Xiao,Shan Liu,Shuhao Qin,Jie Yu
Polyamines with different amino numbers were introduced on the surface of carbon fiber (CF) by a chemical grafting method to improve the interfacial properties of CF/polyamide 6 (PA6) composites. First, a carboxyl group was introduced on the surface of CF, and then polyamine was grafted onto the pretreated CF. The chemical structure of CF was confirmed by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), polarized light microscopy, and Fourier transform infrared spectroscopy (FTIR), and the performance test results of the composites were systematically analyzed. The content of N on the surface of the modified CF reached 18.92%; the interfacial shear strength (IFSS) and tensile strength of the modified CF/PA6 composite reached 58.6 MPa, respectively, which were 41.5% and 45.5% higher than those of unmodified CF/PA6 composites. The above results confirm that amino-functionalized grafting modification is an effective method to improve the interfacial compatibility and adhesion of composites to improve the mechanical properties of composites.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 13
·2812
·
IF 5
Yingwei Zhang,Chunhua Wang,Yong Yi,Wenzhi Wang,Jun Yang
In order to adjust the properties of polyamide 6 (PA6) and expand its application, a new strategy of introducing an aromatic imide structure into the PA6 chain through the random copolymerization method is reported. The diimide diacid monomer was first synthesized by the dehydration and cyclization of pyromellitic dianhydride and 6-aminocaproic acid before it reacted with 1,6-hexamethylene diamine to form poly(amide imide) (PAI) salt, and finally synthesized PA6/PAI random copolymers containing an aromatic imide structure by the random copolymerization of ε-caprolactam and PAI salt. The introduction of an aromatic imide structural unit into the PA6 chain could have a great influence on its properties. As the content of PAI increases, the crystallinity (Xc) and melting temperature (Tm) of the PA6/PAI random copolymer gradually decrease, but its glass transition temperature (Tg) increases obviously. When the PAI content is 20 wt%, the copolymer PA6/PAI-20 has the best comprehensive performance and not only has high thermal stabilities but also excellent mechanical properties (high strength, high modulus, and good toughness) and dielectric properties (low dielectric constant and dielectric loss). Moreover, these properties are significantly superior to those of PA6. Such high-performance PA6 random copolymers can provide great promise for the wider applications of PA6 materials.Keywords:polyamide 6;poly(amide imide);random copolymerization
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）