RSC Advances
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2016
·Vol. 6
·期 100
·97783-97790
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IF 3.289
Ying Sun,Qizan Huang,Xueqin Zhang,Xiaojing Ding,Pei Han,Baoping Lin,Hong Yang,Lingxiang Guo
In recent years, side chain engineering has been proven to play a critical role in the development of high performance conjugated polymers for organic electronics. Here, we report a new strategy to improve charge transport property through side chain functionalization. A series of carbazole–diketopyrrolopyrrole based conjugated polymers P1, P2 and P3 with different side chains have been designed and synthesized. For P2 and P3, a pyrene and carbazole unit were incorporated into the terminal of the alkyl side chain, respectively. Thermal properties, crystallinities, UV-vis absorptions, electrochemical properties as well as charge transport properties of the polymers were investigated in detail. Interestingly, results showed that incorporation of the fused aromatic ring into the side chain terminal not only changed the absorption and electrochemical properties, but also affected the charge transport properties. The pyrene and carbazole group in the side chain terminal significantly promoted aggregation of the polymer chains, which would provide short-range order for improved charge carrier mobility. Compared to the hole mobility (0.019 cm2 V−1 s−1) for polymer P1 with the whole alkyl chains, increased hole mobilities of 0.081 cm2 V−1 s−1 and 0.052 cm2 V−1 s−1 were achieved for polymer P2 and polymer P3, respectively. It is worthy to note that our strategy gives rise to no increment of the crystallinity of the polymer, being beneficial for the practical application of soft electronics since high crystallinity of the material usually leads to poor thin film uniformity and weak mechanical resilience. In this respect, we offer a promising tool to aid rational polymer design for enhanced charge transport property.
研究领域:
高分子化学
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有机电子学
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材料科学
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半导体材料
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光电功能材料
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 32
·期 11
·1564-1574
·
IF 1.42
Li Ming,Zhang Li-fen,Tao Mei-xia,Cheng Zhen-ping,Zhu Xiu-lin
In this work, a fluorescent monomer 2-(9-carbazolyl) ethyl vinyl ether (CEVE) was synthesized in our lab, and its photo-induced living cationic copolymerization behavior with isobutyl vinyl ether (IBVE) was investigated in detail using diphenyliodonium chloride (DPICl)/2,2-dimethoxy-2-phenylacetophenone (DMPA) and zinc bromide (ZnBr 2 ) initiating system in dichloromethane solution at 5 °C, −5 °C, and −15 °C, respectively. The living nature of this copolymerization system was confirmed by adding fresh comonomer method after the copolymerization almost finished. In addition, the obtained fluorescent copolymer poly(IBVE- co -CEVE) has a low glass transition temperature ( T
g ), below −10 °C.
研究领域:
高分子化学
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功能高分子
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光响应材料
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聚合反应机理
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荧光材料
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2026
·
IF 3.6
Licheng Wang,Ming Xie,Mingyuan Li,Zhengguo Cai,Junfen Sun,Long Chen
To enhance the thermal-oxidative stability of polypropylene (PP) fiber, several nitrogen-heterocyclic polypropylene copolymers were synthesized as blending modifiers, containing pyrrole (Py), indole (Id), and carbazole (Cz) groups. The large steric hindrance of indole and carbazole groups reduces the negative effect of heteroatoms on the catalytic center, with the highest polymerization activity of 2.33 × 10 4 kg polymer mol Zr −1 h −1 . Compared with PP, the 5% mass loss temperature ( T 5% ) of PPPy and PPId is increased, while only PPPy is capable of further delaying oxygen permeation. The steady-state shear curves indicate that the cross-linked structure between PPPy molecular chains inhibits the flow of PP/NHPP melt, while the indole and carbazole groups promote the flow of PP/NHPP melt. All PP/NHPP blends are successfully prepared into fibers. The mechanical properties of PP/PPPy fiber are well maintained due to the cross-linked structure. The thermo-oxidative stability of PP/NHPP fibers can be enhanced at a low blend content of 5 wt%, with the maximum rise of 13°C in T 5% and 10.7 min in oxidation induction time, which is expected to be applied in engineering fields requiring high-temperature stability. Highlights High polymerization activity of NHPP. NHPP was first incorporated for the melt-spun blend fiber. NHPP enhances the thermo-oxidative stability of blend fiber.
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ChemCatChem
·
2026
·Vol. 18
·期 15
·e70976
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IF 4.1
Yuxuan Qiao,Yan Lv,Nannan Zhao,Xueyan Wu,Rui Xue,Jixi Guo
The development of efficient and durable non-precious metal electrocatalysts for the oxygen reduction reaction (ORR) is critical to advancing electrochemical energy devices. Herein, we report a porous, carbazole-based N-doped carbon framework catalyst embedded with Fe 2 O 3 nanoparticles and Fe-N x sites. The catalyst was synthesized via pyrolysis of N-rich hypercrosslinked polymers (NHCP), which were derived from the Friedel-Crafts reaction, followed by incorporation of hemin (Fe 2 O 3 /NHCP-2). The introduction of hemin not only preserved the pristine porous architecture but also facilitated the formation of Fe 2 O 3 nanoparticles and Fe-N x sites, and their synergistic effect enhanced the ORR kinetics in alkaline media. The optimized Fe 2 O 3 /NHCP-2 catalyst exhibited a high half-wave potential of 0.87 V and demonstrated robust long-term durability in a 0.1 M KOH solution. When employed as the cathode material in zinc-air batteries (ZABs), it delivered a peak power density of 186.84 mW cm −2 and a specific capacity of 731.37 mAh g Zn −1 . This study presents a promising non-precious metal ORR electrocatalyst for future renewable energy applications. Graphical A porous carbazole-based N-doped carbon framework embedded with Fe 2 O 3 nanoparticles and Fe-N x sites was synthesized by pyrolyzing N-rich hypercrosslinked polymers from a Friedel-Crafts reaction, then hemin incorporation. As a Zn-air battery cathode, Fe 2 O 3 /NHCP-2 delivers a power density of 186.84 mW cm −2 , high specific capacity (731.37 mAh g Zn −1 ) and OCV (1.52 V). The porous structure ensures rapid O 2 transport. Fe 2 O 3 nanoparticles and dispersed Fe-N x sites synergistically enhance ORR. This work demonstrates N-rich hypercrosslinked polymers as effective carbon precursors for high-performance ORR catalysts.
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高影响因子
Foods
·
2026
·Vol. 15
·期 17
·2954
·
IF 6
Rongguang Yang,Luning Zhao,Ying Zhu,Yansheng Zhao,Juan Bai,Xiang Xiao
Polygonatum cyrtonemaHua polysaccharides (PCPs) are bioactive components with antioxidant and immunomodulatory properties. However, whether the polysaccharides derived from elderPolygonatum cyrtonemaexhibit superior health benefits remains unclear. This study systematically compared the in vitro fermentation characteristics, gut microbiota-modulating effects, and short-chain fatty acid (SCFA) production of PCPs extracted from three-year-old (TPP), five-year-old (FPP), and eight-year-old (EPP) plants using a human fecal fermentation model. The fermentation dynamics were evaluated by monitoring pH, OD600, and the consumption of total and reducing sugars, while the structural degradation and compositional differences in PCPs were tracked via molecular weight distribution and monosaccharide composition analysis. The results showed that all three PCPs were degraded and utilized by gut microbiota, accompanied by decreased pH, increased OD600, and enhanced antioxidant activities. High-throughput 16S rDNA sequencing revealed that, at the phylum level, all PCPs increased the Firmicutes/Bacteroidetes ratio. At the genus level, they reduced the abundance of harmful bacteria such asSutterellaand increased beneficial bacteria includingBifidobacteriumandMegasphaera. Furthermore, gas chromatography (GC) analysis demonstrated that, compared with FPP, TPP and EPP significantly promoted the production of SCFAs. In summary, this study indicates that the in vitro fermentation characteristics and prebiotic properties of PCPs vary with growth years, and a comprehensive evaluation suggests that three-year-oldPolygonatum cyrtonemaHua represents a promising raw material for the development of functional foods.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2026
·
IF 8.1
Haopeng Li,Xinbo Dong,Jiahui Huang,Zheng Zhao,Xigao Jian,Cheng Liu
Conventional toughening of bismaleimide (BMI) resin with linear thermoplastic faces a critical compromise: enhanced toughness often compromises thermal properties and elevates melt viscosity, severely limitations for their application in extreme environments. To overcome this long-standing challenge, a novel strategy was pioneered by designing and synthesizing a unique class of hyperbranched poly(carbazole-type bisphthalazinone sulfone)s (h-PCBPSs) with tailored reactive groups (propenyl or allyl), with the trifunctional monomer 4,4′-(9H-carbazole-2,7-diyl)bis(phthalazin-1(2H)-one) (CZ-BDHPZ) employed as the building block via a two-step procedure for the modification of BMI resin. h-PCBPSs exhibited high thermal resistance, with glass transition temperatures ( T g ) ranging from 308 to 355°C. The rheological behavior of the h-PCBPSs/BMI blends was characterized. The temperature range corresponding to the processing window, defined by a viscosity below 0.2 Pa·s, was broadened up to 140.1-185.5°C. The formation mechanisms of sea-island, single-phase, and star-shaped morphologies were elucidated, and the effects of these three distinct morphological structures on the thermal and mechanical properties of the BMI were systematically analyzed. The T g , unnotched impact strength, and flexural strength reached 293°C, 33.5 kJ/m², and 190 MPa, respectively. Compared with the cured product of the neat BMI, these values increased by 5.4%, 196.5%, and 36.7%, respectively. The thermo-oxidative aging resistance mechanism of BMI modified by h-PCBPS-A was elucidated. After 7 days of aging at 250°C, the impact strength retention rate and flexural strength retention rate of h-PCBPS-A-10phr/BMI reached 36.3% and 88.9%, respectively. This work provides a new design strategy for BMI toughening agents and promotes the application of BMI resin in extreme environments.
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高影响因子
MEASUREMENT
·
2025
·
IF 5.6
Yiming Zhang,Ziyan Yin,Jie Cheng,Chunhui Ren,Jingshan Duan,Jinhong Guo,Jiuchuan Guo
With the increasing prevalence of diabetes worldwide, rapid diagnosis and precise prevention strategies have become critically important. Glycated hemoglobin (HbA 1c ), recognized as the gold standard for diabetes diagnosis, provides a reliable reflection of the patient’s average glycemic status over the preceding 2–3 months and exhibits high analytical stability. However, conventional methods of HbA 1c detection, such as liquid chromatography, are limited to centralized laboratories, requiring complex procedures and extended processing times, while existing lateral flow immunoassays (LFIAs) often suffer from low precision and poor reproducibility. In this study, we present a next-generation LFIA platform designed for home diagnosis of HbA 1c . This strategy uses immunoprobes synthesized from long afterglow nanocrystals (LANs), which effectively eliminates endogenous interference, to construct a portable multimodal optoelectronic-graph biosensor, and deploys a lightweight hybrid network model (LHNM)within it. To further enhance diagnostic performance, we introduce a novel global temporal hybrid attention module (GTHAM), which significantly improves the model’s capacity to extract discriminative temporal features from afterglow temporal sequence images. Validation using whole blood samples demonstrated that the system achieves a total detection time of 5 min and 30 s, with a coefficient of variation below 3.05 %. The platform exhibits excellent specificity, signal stability, and diagnostic accuracy comparable to standard laboratory instrumentation, fully meeting clinical diagnosis requirements.
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高影响因子
Journal of Pharmaceutical Innovation
·
2025
·Vol. 20
·期 6
·1-14
·
IF 2.7
Zhang Qinghui,Li Dangwei,Song Jian,Meng Xianmei,Zhao Pingping,Zhou Yihua,Qian Jun
Purpose Hyaluronic acid (HA) is a widely used moisturizing agent, but its strong hydrophilicity and high molecular weight limit its skin permeability. Iontophoresis has been proposed as a strategy to improve HA delivery, but its mechanisms remain unclear. This study aims to investigate how iontophoresis enhances the transdermal transport of HA and to provide a theoretical basis for developing efficient HA delivery systems. Methods Ex vivo pig and rat skin models were used to assess changes in skin electrical properties under iontophoresis. Fluorescein isothiocyanate-labeled HA (FITC-HA) with different molecular weights (3, 10, 35, and 200 kDa) was synthesized to visualize penetration routes and evaluate permeation efficiency. Neutral dextran served as a reference to differentiate the roles of electromigration (EM) and electroosmosis (EO). Results Iontophoresis significantly altered skin electrical behavior, showing polarization and ion accumulation, particularly at the anode with HA. Fluorescence microscopy revealed that HA primarily penetrates through the intercellular pathway, and additionally via hair follicles into the deeper layers of the skin. EM was the primary driving force, with its contribution increasing with applied voltage. Medium-weight HA (10–35 kDa) permeated for 0.5 h under 1 V voltage, showing comparable penetration depth and area to 3 kDa HA under passive conditions. Conclusion Iontophoresis enhances HA transdermal delivery and shows potential as a noninvasive method for skincare and drug delivery applications. Further in vivo studies are needed to support clinical application.
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高影响因子
Science Advances
·
2026
·Vol. 12
·期 33
·
IF 13.9
Xingzheng Yan,Xinyu Tong,Weifu Zhang,Songyu Du,Yanyang Zhou,Jiahan Xie,Hengyu Zhou,Yuan Luan,Yang Zhang,Ruixiang Peng,Mengjin Yang,Lisha Xie,Ziyi Ge
Perovskite solar cells (PSCs) using self-assembled monolayers (SAMs) as hole transporting materials have achieved impressive efficiencies. However, the vulnerability of SAMs causes desorption under light and thermal stress. While various modifications to the conjugated core and anchoring group of SAMs have been explored, challenges in balancing efficiency and stability remain. Here, we introduce a new class of cross-linkable SAMs, uniquely functionalized at the molecular linker. Upon in situ cross-linking, these hybrid monolayers exhibit impressive conductivity and optimal energy level alignment, enabling a power conversion efficiency (PCE) of 26.76% (certified 26.45%) in PSCs. The perovskite solar cells with cross-linkable SAMs also demonstrate superior durability in ageing tests, retaining 99% of its initial PCE under more than 2000 hours thermal stress and 95% of that under 500 hours ultraviolet irradiation. Furthermore, the strategy has been applied in the fabrication of high-efficiency rigid and flexible mini-modules. This molecular design strategy offers a promising and versatile modification site for advancing SAMs-based interfaces in optoelectronic devices.
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PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 5
·1439-1448
·
IF 2.6
He Yan,Guo Zhulei,Chen Mingfan,Wan Sicheng,Peng Nan,Fu Xiaolei,Yuan Dingzhong,Na Bing
In this paper, a new type of carbazole-based hyper-crosslinked porous polymer (HCP-CP) was prepared through a very simple “knitted” method. The obtained novel polymer HCP-CP has a good adsorption property of methyl orange (MO) and methylene blue (MB) organic dyes in aqueous solution due to its high surface area and rich nitrogen atoms. The effect of pH, adsorption time, different initial concentration of dyes and adsorption reusability were investigated in detailed. The optimum pH is 8 for the adsorption of MB and 6 for the adsorption of MO, respectively. Under the best condition, the Langmuir model fitted the adsorption isotherm well and the adsorption behavior follow pseudo-second-order kinetics. The maximum adsorption capacity of HCP-CP for cationic dye MB (q max =751.88 mg/g) is more than twice higher than that of anionic dye MO (q max =274.73 mg/g). These capacity differences may be owing to the stronger electrostatic interaction between the negatively charged nitrogen atoms of HCP-CP with the cationic dye MB than that of MO. Moreover, the used polymer HCP-CP still retain a removal percentage above 92% after 5 times adsorption-desorption recycle. Therefore, this work provided a convenient synthetic route to develop a novel hyper-crosslinked polymer with high adsorption capacity for the entrapment of dyes from aqueous solution.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Lin Chai,Yequn Liu,Wenjun Yan,Na Teng,Hongyan Li,Yongqin Qi,Haoliang Huang,Xiaojing Cui,Xianglin Hou,Tiansheng Deng
It is of fundamental and industrial interest to develop a facile method to modify the graphene sheets with heteroatoms such as oxygen (O) and nitrogen (N). Herein, the O and N atoms were discovered to be grafted onto the edges of graphene sheets during the simple grinding process with solvent in air or N 2 atmosphere. By combining X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscope (HRTEM), energy dispersive X-ray spectrometer (EDS), electron spin resonance spectroscopy (ESR) and H 2 O 2 experiments, we show where the O and N atoms were grafted and how the modification of graphene with O and N atoms occurred. The results showed that the O atoms of air and N atoms of solvent molecules could be bonded to the edges of graphene sheets during the grinding process, which followed the radical reaction mechanism.
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Ning Xie,Tao Wang,Shenghua Du,Qiang Weng,Kai Zheng,Tong Zhang,Xingming Ning,Pei Chen,Xinbing Chen,Zhongwei An
A series of novel poly(carbazole)-based copolymers tethered with three different cationic groups at the bottom of rigid-flexible coupled side-chains is prepared via superacid-catalyzed polymerization and developed as anion exchange membrane (AEM) for fuel cells. It aims to improve conductivity by aggregating long alkyl chains with good flexibility to make dense cationic groups form large ion transport channels, and the dimensional stability can be improved by the rigid unit due to its large free volume. Meanwhile, the effects of the three cations on the properties of this series of membrane materials are also further investigated. The results show that these AEMs have an ion exchange capacity (IEC) of 2.03–2.21 mequiv. g −1 , exhibiting a high ionic conductivity of 133.7–151.3 mS cm −1 , which is attributed to the microphase separation structure constructed by the hydrophilic/hydrophobic difference between this unique side-chain and backbone. These AEMs can remain at least 82% ionic conductivity after immersion in 2 M NaOH solution at 80 °C for 1080 h, indicating excellent alkaline stability. Finally, the AEM and binder prepared in this work are applied to a single cell, displaying a maximum power density of 546 mW cm −2 and an excellent durability, which demonstrates a promising application in fuel cells.
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高影响因子
危险品化学品经营许可证（带存储）