COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2025
·
IF 8.9
Runze Jin,Yijie Zhang,Donghui Guo,Zhiliang Zhou,Lijie Qu,Baosheng Xu
This study introduces a novel approach by designing a flexible three-dimensional Covalent Organic Framework (COFs), specifically NH 2 -POSS-COF, which serves as a uniform cross-linking site within the EP system. This framework provides substantial internal free volume and mitigates stress concentrations by enabling effective energy dissipation during mechanical loading. The research demonstrates that the integration of NH 2 -POSS-COF significantly enhances the fracture toughness and tensile strength of EP at both RT and cryogenic. These findings open new avenues for optimizing EP performance in low-temperature applications, contributing to the development of high-performance composite materials for aerospace missions.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
POLYMER COMPOSITES
·
2015
·Vol. 38
·期 4
·691-698
·
IF 1.632
Haipeng Bai,Yaping Zheng,Ruilu Yang,Aibo Zhang,Nan Wang
Liquid-like trisilanol isobutyl polyhedral oligomeric silsesquioxanes derivative (L-POSS-D) was synthesized with γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560) as corona and polyetheramine M1000 as canopy. Its structure and properties were characterized by FTIR, XPS, TGA and Rheology data. Epoxy nanocomposites with 0.0, 0.5, 1.0 and 2.0 wt% content of L-POSS-D were prepared. T g of the nanocomposites improved 47.6°C higher than pure epoxy resin. Mechanical properties, including flexural strength and impact toughness, were improved markedly with L-POSS-D. The morphologies of impact fracture were studied by SEM. POLYM. COMPOS., 38:691–698, 2017. © 2015 Society of Plastics Engineers
研究领域:
材料科学
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聚合物纳米复合材料
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热分析
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聚合物力学性能
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2019
·Vol. 25
·期 52
·12098-12104
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IF 5.16
Tianyu Shan,Liang Gao,Xiaoqian Tong,Qinqing Du,Zhihang An,Huiwen He,Jiaping Lin,Si Chen,Xu Wang
An amazing phenomenon of the relative magnitude of modulus of two liquid-crystal (LC) gels is found inverted under/above their phase transition temperature T LC-iso , which is further proved to be caused by their diverse morphology flexibility. By testing the polarity of two LCs, gelator POSS-G1-Boc (POSS=polyhedral oligomeric silsesquioxane) was discovered to self-assemble into more flexible structures in a relatively low polar LC, whereas more rigid ones are formed in higher polar LC. Hence, a fitting function to connect morphology flexibility with solvent polarity was established, which can even be generalized to a number of common solvents. Experimental observations and coarse-grained molecular dynamics simulations revealed that solvent polarity mirrors a “Morse code”, with each “code” corresponding to a specific morphology flexibility. Graphical Decoding morphology : With the help of the “Decoding software 2019”, the special “Morse code” of solvent polarity can be translated into morphology flexibility of liquid-crystal (LC) gels (see figure).
研究领域:
超分子化学
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材料科学
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软物质物理
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纳米材料
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自组装
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2015
·Vol. 21
·期 14
·5540-5547
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IF 5.731
Feng Liu,Yuan Zhang,Lei Xu,Weian Zhang
An organic/inorganic hybrid porphyrin derivative, namely, metal-free tetrakisphenyl porphyrin–polyhedral oligomeric silsesquioxanes (H 2 TPP-POSS) was synthesized by azide–alkyne click chemistry. The self-assembly behavior of H 2 TPP-POSS was systematically studied in CHCl 3 at different concentrations and in solvents with different polarities. Novel nanovesicles could be obtained through the self-assembly of H 2 TPP-POSS in CHCl 3 at a concentration lower than 10 −4 m. Diffuse microrods formed at a concentration higher than 10 −4 M . Additionally, the polarity of the solvent also greatly influenced the assembled morphologies, and a series of assembled morphologies, including crescent-shaped micelles, spherical micelles, doughnut-shaped vesicles, and ordered square sheets, could form in solvents with different polarities. Graphical Get in shape! The self-assembly of metal-free tetrakisphenyl porphyrin–polyhedral oligomeric silsesquioxanes (H 2 TPP-POSS) in various solvents with different polarities was investigated. A series of assembled morphologies, including crescent-shaped micelles, spherical micelles, doughnut-shaped vesicles, and ordered square sheets, was obtained (see figure).
研究领域:
材料化学
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纳米技术
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超分子化学
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高分子科学
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杂化材料
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DOI
高影响因子
MOLECULES
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2019
·Vol. 24
·期 7
·1253
·
IF 3.06
Qingrui Zhang,Xiuyun Yang,Ruiping Deng,Liang Zhou,Yang Yu,Yunhui Li
A polyhedral oligomeric silsesquioxanes (POSS) modified 8-hydroxyquinoline derivative (denoted as Q-POSS) was synthesized and used as a ligand to coordinate with lanthanide ions to obtain a series of lanthanide complexes Ln(Q-POSS)3(Ln = Er3+, Yb3+, Nd3+). The as-prepared lanthanide complexes have been characterized by FT-IR, UV–Vis, and elemental analysis. All these complexes showed the characteristic near-infrared (NIR) luminescence originated from the corresponding lanthanide ions under excitation. Compared with the unmodified counterparts LnQ3(HQ = 8-hydroxyquinoline), the Ln(Q-POSS)3complexes showed obviously increased emission intensity, which was ascribed mainly to the steric-hindrance effects of the POSS moiety in the ligands. It is believed that the POSS group could suppress undesired excimer formation and intermolecular aggregation, thus decreasing the concentration quenching effect of the corresponding lanthanide complexes.Keywords:lanthanide complexes;polyhedral oligomeric silsesquioxanes;near-infrared luminescence
研究领域:
材料化学
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光物理化学
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产品关联
DOI
PubMed
高影响因子
Micromachines
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2018
·Vol. 9
·期 6
·258
·
IF 2.222
Yiting Xu,Kaiwei He,Hongchao Wang,Meng Li,Tong Shen,Xinyu Liu,Conghui Yuan,Lizong Dai
Stimuli-responsive polymeric systems containing special responsive moieties can undergo alteration of chemical structures and physical properties in response to external stimulus. We synthesized a hybrid amphiphilic block copolymer containing methoxy polyethylene glycol (MePEG), methacrylate isobutyl polyhedral oligomeric silsesquioxane (MAPOSS) and 2-(diisopropylamino)ethyl methacrylate (DPA) named MePEG-b-P(MAPOSS-co-DPA) via atom transfer radical polymerization (ATRP). Spherical micelles with a core-shell structure were obtained by a self-assembly process based on MePEG-b-P(MAPOSS-co-DPA), which showed a pH-responsive property. The influence of hydrophobic chain length on the self-assembly behavior was also studied. The pyrene release properties of micelles and their ability of antifouling were further studied.Keywords:stimuli-responsive polymer;polyhedral oligomeric silsesquioxane;self-assembly;protein adsorption resistance;controlled release
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Polymers
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2023
·Vol. 15
·期 24
·4726
·
IF 5
Ting Xu,Yumin Jiao,Zhenglian Su,Qin Yin,Lizhou An,Yefa Tan
Phenyl polyhedral oligomeric silsesquioxane (POSS) is modified onto the GO surface by using the strong π–π coupling between a large number of benzene rings at the end of the phenyl POSS structure and the graphite structure in the GO sheet, realizing the non-covalent functionalization of GO (POSS-GO). The POSS-GO-reinforced EP (POSS-GO/EP) composite material is prepared using the casting molding process. The surface morphology of GO before and after modification and its peel dispersion in EP are examined. Furthermore, the mechanical properties, cross-sectional morphology, and reinforcement mechanism of POSS-GO/EP are thoroughly examined. The results show that the cage-like skeleton structure of POSS is embedded between the GO layers, increasing the spacing between the GO layers and leading to a steric hindrance effect, which effectively prevents their stacking and aggregation and improves the dispersion performance of GO. In particular, the 0.4 phr POSS-GO/EP sample shows the best mechanical properties. This is because, on the one hand, POSS-GO is uniformly dispersed in the EP matrix, which can more efficiently induce crack deflection and bifurcation and can also cause certain plastic deformations in the EP matrix. On the other hand, the POSS-GO/EP fracture cross-section with a stepped morphology of interlaced “canine teeth” shape is rougher and more uneven, leading to more complex crack propagation paths and greater energy consumption. Moreover, the mechanical meshing effect between the rough POSS-GO surface and the EP matrix is stronger, which is conducive to the transfer of interfacial stress and the strengthening and toughening effects of POSS-GO.Keywords:polyhedral oligomeric silsesquioxane;graphene oxide;non-covalent functionalization;epoxy resin;mechanical properties
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Feng Jiang,Yuhong Chen,Zhuangjie Ye,Shishi Pang,Bin Xu
New strategy for preparing POSS based amphiphilic nanoparticles was designed by using thiol-ene “click” reaction to improve SDS foam stability. Contact angle of the synthesized nanoparticles was modified from 68° to 57° by changing the feed ratio. The foam ability and stability were evaluated in the view of nanoparticles concentration, temperature, salinity as well as different types of nanoparticles. The results showed that the foam stability was improved evidently at high salinity as well as low temperature. Even and steady distribution of the synthesized nanoparticle was found at the gas-liquid interface, which was confirmed by SEM as well as elemental mapping images. The distribution mode then increased the film thickness to get stable foam, which was confirmed by microscope. The results demonstrated that the unique amphiphilic structure had the potential to get stable foam and the strategy can also be used to design new foam stabilizer .
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2024
·Vol. 15
·期 26
·2698-2709
·
IF 4.1
Yushan Wu,Yu Xiang,Hantian Lu,Faxiang Qin,Peng Xu,Hua-Xin Peng
Nano-reinforced resins are widely used in the aerospace field, but the improvement of the mechanical properties of nano-modified resins is always low or they are even decreased due to the unsatisfactory dispersion and interfacial properties of nano-fillers. A monofunctional polyhedral oligomeric silsesquioxane (POSS) after recrystallization is introduced into a cyanate ester (CE) by pre-reacting with epoxy to form an organic–inorganic hybrid crosslinking network for performance enhancement. The size of POSS aggregates in the CE decreased after recrystallization and pre-reaction, improving the dispersion into the crosslinking network. The effects of the microstructure and reaction route of the POSS on the crosslinking network are evaluated across the synthesis of pendant and telechelic POSS moieties. Results reveal that only when the size of the monofunctional POSS aggregates and the POSS–polymer configuration match the crosslinking network, can POSS simultaneously introduce free volume due to the nanocore while restricting the chain mobility. Through the comprehensive utilization of the physicochemical properties of POSS for the confinement of POSS in the resin, the CE modified with pendant POSS moieties exhibits a superior modulus (4033 MPa), higher glass transition temperature (271.2 °C), and improved dielectric properties at 3 wt% loading of POSS. This effective strategy is proposed to regulate the interactions between inorganic nano-fillers and organic crosslinking networks, which provides guidance to achieve a simultaneous enhancement in thermosetting resin stiffness and dielectric properties.
研究领域:
材料科学
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化学工程
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高分子科学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Kezhen Zhang,Xiaoyong Tian,Peipei Xu,Li Peng,Shanyi Guang,Jihong Feng,Hongyao Xu
Background Mg 2+ has long been recognized as one of the most vital cations due to its diverse physiological and pathological roles, making it indispensable in both biomedical and biological research. Organic fluorescent sensors are commonly employed for Mg 2+ detection, but they often lack high selectivity and exhibit poor hydrophilicity , limiting their biomedical applications. Results Herein, we introduced a novel organic-inorganic hybrid fluorescence sensor, PFHBS, constructed on the POSS nanoplatforms. The efficient connection between PEGylated POSS and the small molecule sensor FHBS through Click chemistry enhances the selectivity and reduces interference, making this chemical sensor ideal for the accurate detection of Mg 2+ . Furthermore, the incorporation of POSS amplifies the ligand field effect of FHBS, making it more conducive to Mg 2+ capture. The modification of PEG chains enhances the sensor's amphiphilicity, facilitating efficient cell penetration and effective Mg 2+ detection at the biological level. Significance Finally, relying on spontaneous permeation, coupled with its strong ligand field effect and excellent cell permeability , the chemosensor demonstrates the capability to intelligently remove excess Mg 2+ from the body. It has been successfully applied to mitigate renal overload resulting from acute Mg 2+ poisoning.
研究领域:
生物化学
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医学检测
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Liucheng Mao,Meiying Liu,Dazhuang Xu,Qing Wan,Qiang Huang,Ruming Jiang,Yingge Shi,Fengjie Deng,Xiaoyong Zhang,Yen Wei
Aggregation-induced emission (AIE) dyes based fluorescent polymeric nanoparticles (FNPs) have been intensively explored for biomedical applications. However, many of these AIE-active FNPs are relied on the self-assembly of amphiphilic copolymers, which are not stable in diluted solution. Therefore, the introduction of cross-linkages into these micelles has demonstrated to be an efficient route to overcome this stability problem and endow ultra-low critical micelle concentrations (CMC) of these AIE-active FNPs. In this work, we reported the fabrication of cross-linked AIE-active FNPs through controllable reversible addition fragmentation chain transfer polymerization by using commercially available octavinyl-T8-silsesquioxane (8-vinyl POSS) as the cross-linkage for the first time. The resultant cross-linked amphiphilic copolymers (named as PEG-POSS-PhE) are prone to self-assemble into stable core–shell nanoparticles with well water dispersity, strong red fluorescence and low CMC (0.0069 mg mL −1 ) in aqueous solution. More importantly, PEG-POSS-PhE FNPs possess some other properties such as high water dispersity, uniform morphology and small size, excellent biocompatibility and cellular internalization, providing great potential of PEG-POSS-PhE FNPs for biological imaging application.
研究领域:
材料科学
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生物医学工程
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纳米医学
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产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2020
·Vol. 18
·期 1
·107-116
·
IF 1.815
Liao Wenbo,Zou Liuyong,Zheng Shaona,Zhao Lili,Huang Xiangxuan,Ye Lingyun,Zhong Guoyu
Polyhedral oligomeric silsesquioxane (POSS)-containing fluorinated poly(styrene–acrylate)/SiO 2 (POSS-FPSA/SiO 2 ) composite materials were prepared by preemulsification and direct blending method. The SiO 2 particles were induced aggregated onto the surface of POSS, and sol–gel processes were simultaneously carried out with addition of co-solvent to form raspberry-like structure. 29 Si NMR and XRD results confirmed that POSS were successfully grafted to polymer and were evenly dispersed uniformly in polymer matrix. The average diameter of composite latexes increased from 63 to 81 nm with increasing addition of SiO 2 content. AFM and WCA images confirmed that sol–gel processes were promoted by increasing addition of SiO 2 content, which improved the roughness and hydrophobicity of composite films. XPS spectra displayed that two kinds of Si–O bonds existed on the surface of composite films. One was related to the Si–O groups of SiO 2 , and the other was attributed to the Si–O–Si groups obtained from the sol–gel processes. The peak area of the former decreased from 56.86% to 38.78%, while the latter increased from 43.14% to 62.22%. TGA curves demonstrated that the composite film exhibited better thermal stability when the SiO 2 content was 10.0%. In addition, serious phase separation would decrease the thermal stability of composite films.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）