Polymer Chemistry
·
2019
·Vol. 10
·期 34
·4718-4731
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IF 4.76
Xian Yang,Junyi Ruan,Chen Ma,Bingjie Hao,Xiaoyu Huang,Guolin Lu,Chun Feng
Self-seeding of living crystallization-driven self-assembly (CDSA) has been considered to be one of the most attractive strategies to fabricate well-defined fiber-like nanostructures with excellent control over their length and composition. To extend the scope of self-seeding of oligo(p-phenylene vinylene) (OPV)-based copolymers, the poly(N-(2-hydroxypropyl) methacrylamide) (PHPMA) segment with proven biocompatibility, synthetic flexibility and well-developed conjugation chemistry, which was synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization using an azide-containing chain transfer agent, was coupled with the alkyne-terminated OPV block by a copper-catalyzed alkyne–azide cycloaddition reaction. All OPV5-b-PHPMA (OPV5-b-PHPMA36, OPV5-b-PHPMA71 and OPV5-b-PHPMA100, the subscripts represent the number of repeat units of each block) with the same crystallizable core-forming OPV segment but different corona-forming PHPMA blocks of various chain lengths can self-assemble in ethanol to form fiber-like micelles with a length of several micrometers by a direct heating and cooling process. Uniform fiber-like micelles with a length up to ∼1 μm can be easily prepared by temperature-induced self-seeding of OPV5-b-PHPMA71. However, for self-seeding of OPV5-b-PHPMA36, ribbon-like nanostructures with a uniform and controllable length were formed, whereas relatively short fiber-like micelles with broad length distributions were formed under similar conditions for OPV5-b-PHPMA100. These results indicated that the length of the PHPMA segment played an important role in determining the self-seeding behavior of OPV5-b-PHPMA.
研究领域:
高分子化学
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纳米材料科学
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自组装
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生物相容性材料
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药物递送系统
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Chemical Engineering and Processing-Process Intensification
·
2022
·
IF 4.264
Kai Zhu,Wenjie Ye,Meng Hu,Yiping Huang,Jingjing Huang,Hanfei Liu,Hao Zhu,Zhenhao Wei,Feng Zhou
4-nitroaniline has been widely used in the production of antioxidants, dyes and pharmaceuticals. A continuous-flow strategy was exploited for the efficient synthesis of 4-nitroaniline through the noncatalytic amination of 4-chloronitrobenzene with aqueous ammonia in a highly controlled and safe manner, in which N-methyl-2-pyrrolidone was selected as the appropriate solvent. Various conditions (reaction temperature, residence time, 4-chloronitrobenzene concentration, molar ratio of ammonia to 4-chloronitrobenzene, presence of base catalyst) were investigated to improve the synthesis of 4-nitroaniline. The Box-Behnken design in response surface methodology was employed for the optimization of reaction conditions, and over 91% yield of 4-nitroaniline could be achieved. Furthermore, a kinetic model was proposed to guide the design and optimization of the synthesis of 4-nitroaniline.
研究领域:
有机合成
·
化学工程
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Qilong Zhang,Zhicai Zhu,Da Shen,Hui Yang
This paper reports a feasible method to prepare pure organic polymeric nanocomposites with enhanced dielectric and hydrophobic performance. Homogeneous polystyrene (PS) microspheres with an average diameter of about 250 nm was firstly synthesized through emulsion polymerization. The blend film containing PS, PDMS and P(VDF-TrFE) are prepared by a simple solution-blending and spin-coating method. The blend film exhibits enhanced dielectric and hydrophobic properties. Typically, the dielectric constant of the blend film with 23 wt% PS reaches 21 at 100 Hz, which is 3 times that of PDMS/P(VDF-TrFE) (mass ratio: 2/3) due to enhanced interfacial polarization caused by PS addition. Meanwhile, the blend film with 23 wt% PS possesses a large apparent contact angle of 125° because the presence of a rough surface makes the solid-liquid contact surface larger than the apparently observed area, thus enhancing hydrophobicity. All the improved performances show great potential application for electrowetting devices.
研究领域:
材料科学
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电气工程
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DYES AND PIGMENTS
·
2023
·
IF 4.5
Taisheng Wang,Yifan Wu,Yangguang Xia,Ye Yuan,Ziyi Dou,Chenqun Kan,Na Zhang
We have synthesized a kind of cyano-substituted oligo( p -phenylene) hybrid materials by Knoevenagel condensation reaction, which can be used as ratiometric relative humidity (RH) sensor. When the RH increased from 5 % to 90 %, the maximum emission peak of C1-3/SG gradually redshifted from 530 nm to 575 nm with the fluorescence changed from green to orange. This phenomenon can be attributed to the water vapor induced aggregation of dyes on the matrix. The non-covalent force between the dyes and the silica gel could be adjusted by altering the structures of the dyes, and the RH sensing property of the final hybrid materials could be further regulated. R2-3/SG hybrid fabricated by R2 with large steric isooctyl groups possessed indiscernible RH sensing properties, while the R1-3/SG without hydrogen bond interactions between dyes and substrate was more susceptible to water vapor. The surface properties and specific surface area of the substrate were critical for RH sensing. RH sensing properties were not presented for the substrates without hydroxyl groups or low specific surface area such as PET or PP fibers. Moreover, we have prepared a kind of C1 loaded paper strips, which exhibited potentially ability in anticounterfeiting application.
研究领域:
材料科学
·
化学
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing Wang,Zhong Yang,Jianyong Jiang,Chaoyong Deng,Kongjun Zhu
Flexible dielectric materials with benign energy storage performance are highly desirable for the miniaturization, portability and integration of modern electronics. However, the limited energy storage density seriously restricts their practical applications. Herein, multilayered composite films composed of the P(VDF-HFP) matrix and Nd doped BaTiO 3 nanofibers with various filling ratios, layer numbers and topological structures were systematically designed and constructed via the layer-by-layer non-equilibrium process. The 3-layered composite films (3.0 wt% filling ratio) with the pure P(VDF-HFP) layer adjacent to the electrodes revealed good mechanical behavior, greatly enhanced captured ions at interfacial regions and suppressed injected charges from electrodes, which facilitated the improvement of the breakdown strength and discharged energy density. And a maximum U e of 25.5 J/cm 3 with a E b of 719.9 MV/m was achieved, which was not only 1.4 times more than the pure P(VDF-HFP) via the same process, but also behaved better than counterparts with the similar filling ratios and was among the top U e values of related P(VDF-HFP)-based nanocomposites.
研究领域:
材料科学
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介电材料
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能量存储
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纳米复合材料
·
聚合物基复合材料
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2026
·
IF 3
Wenya Huo,Yike Kuang,Zhendong Sha,Jun Ding
p-Nitrophenol (p-NP) is a toxic and persistent pollutant commonly found in industrial wastewater, necessitating efficient and economically viable treatment strategies. In this work, we develop a low-cost and high-performance catalyst consisting of Fe-Cu-Cr mixed metal oxides supported on activated carbon (AC), synthesized through a simple impregnation-calcination method and applied for peroxymonosulfate (PMS) activation.Systematic optimization of preparation parameters revealed that HCl pretreatment of activated carbon, a ternary Fe-Cu-Cr composition, a 20 wt% metal loading, and calcination at 600 °C yield the highest catalytic activity, achieving p-NP degradation with Ct/C₀ ≈ 0.25 after 4 h. Notably, the total treatment cost can be maintained below 30 CNY per ton of wastewater, demonstrating a substantial economic advantage over reported catalytic systems. Mechanistic studies show that p-NP degradation follows a synergistic adsorption-catalysis pathway, wherein activated carbon enriches p-NP at the catalyst surface and multivalent metal oxides efficiently activate PMS to generate reactive oxygen species, primarily •OH. This work introduces a practical, scalable, and cost-effective catalyst design using earth-abundant metals, offering a promising avenue
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PubMed
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2026
·Vol. 27
·期 8
·3362
·
IF 5.6
Xiateng Qin,Yan Zhao,Zhonghua Ji,Changyong Li,Suotang Jia
Phenetole derivatives with dual ethoxy substituents exhibit rich conformational diversity and complex vibronic characteristics, making them important model compounds for understanding substituent effects on molecular structure and spectroscopy. In this work, we systematically investigated the stable rotamers, vibronic spectra, and cationic ground-state features of p-diethoxybenzene (PDEB) using resonance-enhanced multiphoton ionization (REMPI), UV-UV hole-burning (HB), and mass-analyzed threshold ionization (MATI) spectroscopies, combined with density functional theory (DFT) calculations. The ground-state potential energy surface (PES) of PDEB was calculated at the B3LYP/6-311++G(d,p) level, identifying eight rotamers with distinct statistical weights and relative energies. Hole-burning spectroscopy resolved two dominant rotamers (cis/up–up and trans/up–down) in the supersonic molecular beam, with their S1←S0transition origins determined as 33,824 cm−1and 33,613 cm−1, respectively. Franck-Condon simulations of the vibronic transitions showed excellent agreement with the experimental REMPI spectra, enabling precise assignment of substituent and benzene ring vibrational modes. MATI experiments yielded accurate adiabatic ionization energies (AIEs) of the cis and trans rotamers as 59,629 ± 5 cm−1and 59,432 ± 5 cm−1, respectively, and identified active cationic vibrational modes in the D0state. Geometric parameters of PDEB in the S0, S1, and D0states were calculated at the B3PW91/aug-cc-pVTZ, TD-B3PW91/aug-cc-pVTZ, and UB3PW91/aug-cc-pVTZ levels, revealing structural evolution during electronic excitation and ionization. The effects of ethoxy substituent orientation on molecular energy, vibrational frequencies, and ionization energy are discussed, and differences in spectral characteristics between PDEB and its meta isomer (MDEB) are compared. This work provides a comprehensive spectral and structural database for p-diethoxybenzene and deepens the understanding of structure–property relationships in diethoxybenzene isomers.
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PubMed
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 10
·4211-4221
·
IF 4.4
Dai Shuming,Song Ping,Jiao Ziyue,Cheng Yi,Shang Jingzhao,Leng Xuefei,Wei Zhiyong,Li Yang
A series of bisphenol A-based polyarylates was synthesized by using 2,2-bis (4-hydroxyphenyl) propane (BPA), terephthaloyl dichloride (TPC), and isophthaloyl dichloride (IPC) as raw materials and p-tert-butylphenol as a capping agent through interfacial polymerization to investigate the effect of end group structure on polymer properties. And the polymer films could be obtained by solvent casting method. The successful introduction of p-tert-butylphenol into the backbone adjusted molecular masses and achieved a regulable improvement of the polymer’s thermal properties. The thermal mass loss 5% temperature of the polymers raised above 470 °C, which indicated the thermal properties were broadly in line with that of the commercial product U-100. Besides, the addition of capping agent also improved the light transmission of the polymers and the transmittance reached above 83% at a wavelength of 450 nm. In addition, the thermal degradation mechanism of polyarylate and U-100 was investigated by simultaneous thermal analysis (STA)-IR and Py/GC–MS. It was discovered that PAR decomposed thermally at their end groups and ester groups first, followed by the breakage of their carbon–carbon bonds, which coincided with U-100’s thermal degradation mechanism. The thermal degradation mechanism of bisphenol A-based polyarylates was proposed. Graphical abstract
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产品关联
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RSC Advances
·
2023
·Vol. 13
·期 11
·7614-7620
·
IF 3.9
Lei Wei,Yanhong Lu,Ruixuan Lu,Yuxin Cui
Hydrolytic dehydrogenation of ammonia borane is a significant and promising approach for on-site hydrogen production at ambient conditions, and developing highly efficient and low-cost catalysts has attracted considerable attention. Herein, waste-biomass-derived activated carbon (AC) was prepared by hydrothermal carbonization and alkali-assisted activation, and non-precious bimetal phosphides (Co–Cu–P) nanocatalysts with a series of different Co/Cu ratios were synthesized on the AC surface through in situ phosphidation method. Owing to the synergetic effects, the optimal Co0.8Cu0.2P/AC presents an outstanding turnover frequency of 26.5 min−1 (25 °C), which is much higher than that of many reported catalysts. The reaction activation energy was measured to be 34.6 kJ mol−1. Benefiting from the ferromagnetic nature of the phosphides, the Co0.8Cu0.2P/AC can be magnetically separated and reused again. After recycling six times, the catalyst still retains 72% of the initial activity, thus indicating great potential for practical applications.
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RSC Advances
·
2023
·Vol. 13
·期 17
·11530-11536
·
IF 3.9
Bin Li,Aolin Wu,Wenrui Hao,Jizhen Liu,Zhigang Hu,Ying Wang
Deep eutectic solvent (DES) was synthesized from urea (U), acrylamide (AM) and choline chloride (ChCl), sodium alginate (SA) was selected as filler, and SA/P(U-AM-ChCl) composite hydrogel was prepared by thermal initiation frontal polymerization (FP). The hydrogels were characterised by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The effects of SA on the swelling properties, mechanical properties and self-healing properties of the composite hydrogels were investigated. The results show that the swelling properties of the composite hydrogel with the addition of SA are greatly enhanced due to the large number of hydroxyl groups contained in the SA chain. The tensile strength of the hydrogel gradually increased with increasing SA content, with the maximum tensile strength increasing by a factor of 2.89. The self-healing efficiency of the composite hydrogel gradually increased with the increase of SA, and the healing rate of FP5 reached 94.4% after 48 h of healing. This study provides a simple and rapid method for the preparation of composite hydrogels with good mechanical properties and self-healing properties.
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DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Jie Xu,Xiaowei Liu,Rui Li,Boxiong Shen,Zijian Zhou,Lidan Deng,Lei Liu,Xinbo Zhu
Converting CO 2 into renewable fuel via photocatalysis is of significance to solving the energy crisis and climate change. However, the limited electron transfer in single catalysts always limits the reduction reaction. In this work, a p-n heterojunction was constructed between Cr doped MgAl–LDH (abbreviated as LDH) and Co 3 O 4 for visible-light-driven fuel production. Since LDH and Co 3 O 4 both have the sufficient potentials to drive CO 2 photoreduction, the constructed type-II heterojunction is more favorable for electron utilization efficiency. The optimal Co 3 O 4 /LDH heterojunction exhibited the highest CO evolution rate of 7.42 μmol•g −1 •h −1 and a CO selectivity of 90.5% with TEOA as sacrificial agent . The further characterizations highlight that the addition of Co 3 O 4 greatly improves the light absorption and the heterojunction effectively promotes the reverse migration of electrons and holes. This work investigates and verifies the designed type-II heterojunction based on MgAl–LDH, which has the guidance for the design of heterojunction catalysts and promotes the practical application of MgAl–LDH in photocatalytic region.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Zhaoyi Yang,Xiaofang Yang,Guangyu An,Dongsheng Wang
Optimization of Fe-based heterogeneous catalyst for enhancing PMS activation was studies by an electronic structure regulation strategy. The single atom and nano-particle Fe-catalysts were then modified by P-doping on carbon support and tested for BPA degradation. Catalysts with P-doping led to 100 % BPA degradation in 30 min, much better than single atom and nano-particle control groups (56 % and 61 %). Experimental and DFT results revealed that P-doping increased the electron density of Fe and induced the transformation of Fe 3d electron spin state from low spin to medium spin, then the Fe 3d orbitals with high energy could better overlap with O 2p orbitals of PMS, promoting the electron transfer process from Fe to PMS and generation of hydroxyl radical. This work provides a deep understanding of spin state modulation for designing high-performance PMS activation catalysts.
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