ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Pingping Chen,Xu Liu,Shi Wang,Qinghui Zeng,Zhinan Wang,Zengxi Li,Liaoyun Zhang
The original poly(ethylene oxide)-based polymer electrolytes normally show low ionic conductivity and inferior mechanical property, which greatly restrict their practical application in all-solid-state lithium-ion batteries (LIBs). In this work, a hyperbranched star polymer with poly(ethylene glycol) methyl ether methacrylate flexible chain segments is embedded into a three-dimensional (3D) interpenetrating cross-linking network created by the rapid one-step UV-derived photopolymerization of the cross-linker (ethoxylated trimethylolpropane triacrylate) in the presence of lithium salt. The rigid 3D network framework provides the polymer electrolyte with not only enhanced mechanical behavior, including film-forming and dendrite-inhibiting capabilities, but also nanoconfinement effects, which can speed up polymer chain segmental dynamics and reduce the crystallinity of the polymer. Depending on this unique rigid–flexible coupling network, the prepared solid polymer electrolyte shows enhanced ionic conductivity (6.8 × 10–5 S cm–1 at 50 °C), widened electrochemical stability window (5.1 V vs Li/Li+), and enough mechanical stability to suppress the growth of uneven Li dendrite (the Li symmetrical cells can operate steadily at both current densities of 0.05 and 0.1 mA cm–2 for 1000 h). Moreover, the assembled LiFePO4//Li cell also exhibited good cycle performance at 50 °C, making the hyperbranched star polymer electrolyte with a nanoconfined cross-linking structure to have potential application in high-safety and high-performance LIBs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 8
·4895-4901
·
IF 1.676
Zhang Weiguo,Chang Shuaishuai,Yao Suwei,Wang Hongzhi
Submicron star-like ZnO (ZnO SZ) was synthesized via a facile hydrothermal method, and a series of composite photoanode materials with different ZnO SZ concentrations in the range from 0 wt.% to 0.20 wt.% were synthesized by a mechanical mixing method. The as-prepared samples were characterized by x-ray diffraction analysis, scanning electron microscopy, ultraviolet–visible (UV–Vis) absorption spectroscopy, etc. The results clearly showed that the mean diameter of the ZnO SZ was approximately 300 nm while its length was in the micrometer range, and the ZnO SZ was embedded homogeneously into the ZnO nanoparticle photoanode. Although UV–Vis spectral analysis revealed that increasing the ZnO SZ content decreased the dye adsorption density of the composite photoanode, the photocurrent density–voltage ( J – V ) characteristic indicated that dye-sensitized solar cells (DSSCs) using the ZnO SZ/ZnO composite photoelectrode exhibited significantly improved photovoltaic performance compared with those using pure ZnO nanoparticles. Electrochemical measurements revealed that DSSCs using 0.10 wt.% ZnO SZ showed improved efficiency of light energy conversion of 1.38%, being 43.75% higher than when using pure ZnO. All these results prove that incorporation of ZnO SZ into the ZnO nanoparticle photoelectrode represents a highly effective method for improving the photovoltaic properties of DSSCs.
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2015
·
IF 2.515
Chong Zhang,Lijuan Chen,Lin Tan,Xiajun Zheng,Yanmei Wang
In this study, a set of well-defined multiarm star copolymers , hyperbranched poly(ethylenimine)-graft-poly(ethylene glycol) (bPEI- g -PEG) with different PEG grafting ratios were synthesized. The star PEG-based coatings were then prepared by immobilizing the corresponding copolymers onto poly(dopamine) (PDA)-coated substrates. The chemical composition , hydrophilicity , surface topography , and thickness of the coatings were studied by X-ray photoelectron spectroscopy (XPS), water contact angle (WCA), atomic force microscopy (AFM), and variable angle spectroscopic ellipsometry (VASE), respectively. Furthermore, the surface PEG chain density of star PEG-based coating was evaluated quantitatively and compared with that of linear PEG-based coating. Our results showed that the amount of proteins (albumin from bovine serum, fibrinogen, and lysozyme) adsorbed on the star PEG-based coating as measured by surface plasmon resonance (SPR) was found to be dependent on the surface PEG chain density, which was controlled by the polymer incubation concentrations and PEG grafting ratios. Generally, the star-shaped PEG gave the surface with higher PEG chain density than linear ones and the amount of adsorbed proteins decreased with increasing surface PEG chain density. At last, the star PEG-based coating was successfully applied into the capillary inner surface for protein separation by capillary electrophoresis (CE).
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 97
·54268-54281
·
IF 3.708
Yinwen Li,Huilong Guo,Jian Zheng,Jianqun Gan,Yan Zhang,Xiaoxiao Guan,Kun Wu,Mangeng Lu
Novel macromolecular star polymers with triazole and cyclodextrin (CD) segments as branch points and poly(oligo(ethylene glycol)methacrylate) (POEGMAs) as dense hydrophilic branches were synthesized via a combination of azide–alkyne click chemistry and atom transfer radical polymerization (ATRP). Firstly, a tetrafunctional linking agent (PETP) was prepared by the reaction of pentaerythritol (PE) and propargyl bromide, and then a four arm β-CD terminated star polymer (PE-CD) was obtained through the click chemistry reaction. Finally, thermally-responsive star polymers (PE-CD–POEGMAs) with PE as the central core, triazole and CD segments as branch points, and POEGMAs as side branches were synthesized by the ATRP of MEO2MA and OEGMA using PE-CD terminated with bromines as macroinitiators. A study on the thermoresponsivity and morphology of PE-CD–POEGMAs indicated that polymeric nano-aggregates existed as multimolecular micelles and behaved with tunable thermosensitivity, which were driven by the strong hydrophobic–hydrophilic interactions in the inner core and outer shell. The encapsulation capacities towards multi-guest molecules were investigated and the results indicated that water soluble guests could be encapsulated by PE-CD–POEGMAs, and the guest encapsulation capacities were derived from the special star molecular structure properties of PE-CD–POEGMAs and the synergistic encapsulation phenomenon of different guest molecules. This unique amphiphilic star polymer illustrated the potential applications in supramolecular science, drug delivery and other nanotechnology applications.
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Chong Wang,Pei-Yi Liu,Ze-Zhong Lin,Yu Chen,Hai-Chao Li
Numerous plasticizers have been developed to acquire the traditional soft poly(vinyl chloride) (PVC) that is characteristic of a high elongation at break, but a low modulus of <70 MPa. Special highly-stretchable PVCs with high modulus (>70 MPa) are highly desirable for widening the application fields of PVC materials. Herein, a series of star copolymers with hyperbranched polyethylenimine (PEI) as core and poly(ε-caprolactone) (PCL) as shell (PEI-PCL) were utilized as plasticizers to prepare functional highly-stretchable semi-rigid plasticized PVC materials. Under the 0.5 weight ratio of PEI-PCL to PVC, the obtained plasticized PVCs showed the highest modulus of around 392 MPa under the assuring of >400% elongation at break, which was nearly four-fold of the most rigid plasticized PVC materials ever-reported. Through the further DSC and FTIR characterizations and the comparison with linear PCL plasticizers, the reason for so rigidity was ascribed as that the guest-encapsulation capability of PEI-PCLs led to the physical crosslinking of PVC chains by the amidated PEI core through the dense hydrogen-bonds. Furthermore, PEI-PCLs could disperse hydrophilic dyes homogeneously into PVC matrix, resulting in colorful or photoluminescent PVC materials.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yao Zhong,Xiaolei Li,Li Ye,Pengcheng Zhu,Lin Zhuang
Anisotropic gold nanostars are near-infrared (NIR) absorbing photosensitizers applied in photothermal therapy (PTT) and photodynamic therapy (PDT). However, the thermodynamic instability of the gold nanostars leading to passivation limits their anti-tumor efficacy in addressing spreading and metastatic tumors. Herein gold star@PB@CuS (GPC) nanoparticles with a core–shell structure were designed and fabricated to address the shortcomings above and achieve multimodal anti-tumor treatment. GPC exhibits a broader absorption peak (810 nm) at the near-infrared region (NIR) through the synergistic effect, achieving excellent photothermal conversion efficiency and stability along with stronger photoacoustic (PA) imaging. The high tunable plasmon resonances of gold nanostars enable them to optimize the localized surface plasmon resonance (LSPR) effect through adjustments in their shape and size. This ensures that the laser wavelengths used for PTT and PDT processes of GPC are coherent at 808 nm (in the so-called “first bio-window”), without significant passivation. Simultaneously, we found that GPC further introduced chemodynamic therapy (CDT) by enabling glutathione (GSH) depletion, Fenton-like reactions, and self-supplied O2 to assist type-I PDT breaking in hypoxia and over expressed the GSH tumor microenvironment (TME). The endogenous and exogenous triggered nanotherapeutic platform PTT/PDT/CDT enables a complete ablation of 4T1 tumors within the first bio-window, showcasing enhanced photo-therapeutic efficacy and addressing critical challenges in current anti-tumor strategies.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Quan Yan,Bai-Liang Xue,Xiaojie Xie,Wenliang Wang,Xin-Ping Li,Xiaojun Shen,Xianzhi Meng,Wei Zhao
The valorization of lignin into high-performance polymeric materials remains a significant challenge, primarily due to the inherent complexity of conventional synthetic methodologies and the non-reprocessable nature of derived polymers. In this study, we present a convenient one-pot strategy to access fully bio-based lignin-integrated polymers endowed with reprocessability. This approach leverages the side reaction, free radical termination, during the synthesis of star-shaped lignin graft copolymers via radical polymerization, enabling the initial formation of a primary permanent network and concurrently enhance monomer utilization (95.6% conversion vs. 62.1% in conventional star polymer). Subsequently, carboxylic acid-terminated poly(lactic acid) oligomers are employed as green cross-linking agents to establish a secondary adaptive network via transesterification reactions. The resulting dual-network polymers exhibit tunability in mechanical properties and excellent reprocessability while retaining structural integrity. Notably, these dual-network systems demonstrate an 18.5±1.9-fold enhancement in mechanical strength compared to their linear polymer counterparts. Moreover, these materials demonstrate remarkable super hydrophobicity (contact angle >108°), enhanced thermal stability, and distinctive light-responsive behavior. This work presents a paradigm-shifting methodology that strategically repurposes side-reaction pathways to synthesize sustainable polymers, advancing the development of sustainable materials for circular economies.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Hui Bai,Yinan Zhao,Lei Chen
The inherent presence of structurally similar stereoisomers in natural products poses great challenges for chiral quality control in pharmaceutical and botanical industries, particularly in differentiating the pharmacological activity of high-purity enantiomers. Multi-column methods are commonly used to separate multiple pairs of enantiomeric components, serious impact on the separation efficiency. To address this issue, a star hydroxypropyl cyclodextrin polymer (Star-HPCD) mixed-mode ligand with higher selectivity was designed to achieve both chiral recognition and structural selectivity. Sil-Star-HPCD chiral stationary phase (Sil-Star-HPCD CSP) enabled the simultaneous separation of three pairs of quinoline alkaloid stereoisomers during a single chromatographic run with a separation factor (α) greater than 1.5, significantly improving the analytical efficiency. Compared with the linear polymer structures, the supramolecular structure formed by star-shaped polymer significantly reduces the steric hindrance and improves the ligand density, which provides a prerequisite for adequate chiral recognition. Complementary evidence from molecular simulations and chiral NMR revealed multiple interactions at the molecular level for this single-column separation results. This work establishes a new strategy for the preparation of functionalized chiral ligands through structural design, which facilitates efficient stereoisomer analysis and chiral quality control in natural products.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2017
·Vol. 75
·期 7
·2917-2931
·
IF 1.43
Ding Amin,Teng Lijing,Zhou Yifeng,Chen Pengpeng,Nie Wangyan
The star-shaped poly( l -lactide) (s-PLLA) was synthesized via ring-opening polymerization of l -lactide, with xylitol as a multifunctional initiator and stannous octoate as a catalyst. The structures of s-PLLA were characterized by 1 H NMR spectroscopy, while the molecular weight ( M
w ) and polydispersity index were determined by gel permeation chromatography. Bovine serum albumin (BSA) loaded s-PLLA microspheres were fabricated by a water–oil–water ( W
1 / O / W
2 ) double-emulsion solvent evaporation method. The morphology, drug encapsulation efficiency (EE), and in vitro release behavior of the prepared microspheres were studied in detail. Results indicated that the average diameters of s-PLLA microspheres could be controlled between 7 and 15 µm by varying the s-PLLA’s concentration or M
w , and the drug encapsulation efficiency of BSA-loaded microspheres were 10–42%. The in vitro study shows that the BSA-loaded microspheres prepared by high molecular weight s-PLLA had a slow cumulative release behavior in phosphate buffer saline (PBS, pH 7.4) and the release process followed the Baker–Lonsdale equation. Present work supposes that the synthesized s-PLLA is a good candidate for drug delivery.
研究领域:
生物材料学
·
药剂学
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2015
·Vol. 58
·期 2
·357-363
·
IF 1.695
Zhou Yuanhang,Chen Weichao,Du Zhengkun,Zhu Dangqiang,Ouyang Dan,Han Liangliang,Yang Renqiang
A new star-shaped small molecule named TCNR3TTPA, with a triphenylamine (TPA) unit as the central building block and 2-(1,1-dicyanomethylene)-3-octyl rhodanine (CNR) as the end-capped group, has been designed and synthesized. TCNR3TTPA showed a deep highest occupied molecular orbital (HOMO) energy level (−5.60 eV) and broad absorption. The solution-processed bulk heterojunction (BHJ) solar cells based on TCNR3TTPA:PC 61 BM (1:1, w / w ) exhibited a high open-circuit voltage ( V
oc ) of 0.99 V, a short-circuit current density ( J
sc ) of 5.76 mA/cm 2 , and a power conversion efficiency (PCE) of 2.50% under the illumination of AM 1.5 G, 100 mW/cm 2 . The high V
oc is ascribed to the strong electron-with- drawing ability of the end-capped 2-(1,1-dicyanomethylene)-3-octyl rhodanine group. These results demonstrated that the V
oc of small-molecule organic solar cells could be increased by introducing a strong electron-withdrawing end-capped block, and that this is an effective strategy to design high-performance small molecules for organic solar cells.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2015
·Vol. 54
·期 3
·407-417
·
IF 3.113
Cui-Wei Wang,Chao Liu,Xiao-Wei Zhu,Zi-Ying Yang,Hong-Fan Sun,De-Ling Kong,Jing Yang
Well-defined star-shaped hydrophobic poly(ε-caprolactone) (PCL) and hydrophilic poly(ethylene glycol) (PEG) amphiphilic conetworks (APCNs) have been synthesized via the combination of ring opening polymerization (ROP) and click chemistry. Alkyne-terminated six arm star-shaped PCL (6-s-PCL x -CCH) and azido-terminated PEG (N 3 -PEG-N 3 ) are characterized by 1 H NMR and FT-IR. The swelling degree of the APCNs is determined both in water and organic solvent. This unique property of the conetworks is dependent on the nanophase separation of hydrophilic and hydrophobic phases. The morphology and thermal behaviors of the APCNs are investigated by SEM and DSC respectively. The biocompatibility is determined by water soluble tetrazolium salt reagents (WST-1) assay, which shows the new polymer networks had good biocompatibility. Through in vitro release of paclitaxel (PTX) and doxorubicin (DOX), the APCNs is confirmed to be promising drug depot materials for sustained hydrophobic and hydrophilic drugs. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 407–417
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2013
·Vol. 5
·期 1
·175-185
·
IF 5.231
Qijing Chen,Yuanyuan Xu,Xueteng Cao,Lianjie Qin,Zesheng An
A series of five core cross-linked star (CCS) polymers has been synthesized by RAFT-mediated heterogeneous polymerization in aqueous media. These CCS polymers consist of poly(MEAx-co-PEGAy) (MEA is 2-methoxyethyl acrylate and PEGA is poly(ethylene glycol) acrylate) of different compositions. They exhibit responsiveness to both temperature and salt. Addition of kosmotropes reduces the cloud point, and addition of chaotropes raises the cloud point. These CCS polymers can stabilize dodecane-in-water high internal phase emulsions (HIPEs) in the absence or presence of salts. Addition of salts has negligible effect on the maximum oil fraction, the size of oil droplets or the stability of the HIPEs. HIPEs with large oil fractions (up to 92 vol%) at low concentrations of CCS polymers (≤1 wt%) can be routinely obtained. When the oil volume fraction is larger than 74 vol%, gelled HIPEs are formed with long-term stabilities (more than three months). The temperature and salt responsiveness of the CCS polymers is transferred to the CCS-stabilized HIPEs. Addition of kosmotropes can enhance demulsification efficiency, while addition of chaotropes can decrease demulsification efficiency or enhance the thermal stability of the CCS-stabilized HIPEs. The emulsification–demulsification cycle can be successfully repeated four times. The facile and aqueous synthesis of CCS polymers and the fast response of the CCS-stabilized HIPEs will open up new opportunities for the preparation and exploitation of a range of smart soft materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）