JOURNAL OF CATALYSIS
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2023
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IF 7.3
Yu Cao,Gan Tao,Wei Li,Chuanding Dong,Jingdai Wang,Yongrong Yang
Manipulating the interplay between electron donor and catalytic species is a major approach of optimizing Ziegler-Natta catalysts. To this end, it is essential to reveal the correlation between the involved dynamic processes. In this work, a greatly enhanced mobility of the internal donor tetrahydrofuran (THF) is realized even at room temperature in the MgCl 2 substrate modified with MgCl functionalized polyhedral oligomeric silsesquioxane (POSS-MgCl). A series of spectroscopic characterizations evidence that, thanks to the high mobility of THF, the immobilization of catalytic Ti species and the migration of THF occurs synchronously and leads to a nearly homogenous distribution of Ti sites. In addition, the incorporation of POSS-MgCl promotes the formation of 4-coordinated Mg sites in the substrate. The modified Ziegler-Natta catalyst shows the remarkable performance toward ethylene polymerization, featured by the high catalytic activity (21.6 × 10 6 g PE(mol Ti·h) −1 ) as well as a narrow polydiversity index (3.1) of the synthesized polyethylene. Based on these results, we propose that the Ti immobilization process is directly modulated by the THF migration in this system, which reduces the aggregation of TiCl 4 and enhances the formation of active species.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
CHIRALITY
·
2021
·Vol. 34
·期 1
·61-69
·
IF 2.437
Hui Zou,Wen-Quan Liang,Qi-Liang Wu,Li Zhou,Xiao-Hua Hou,Na Liu,Zong-Quan Wu
Helical polymers present some interesting and distinctive properties, and one of the most distinguished applications of them is the chiral recognition and resolution of enantiomers. In this work, star-shaped hybrid helical poly (phenyl isocyanide) (PPI) with polyhedral oligomeric silsesquioxanes (POSS) as the core was designed and synthesized by “grafting to” strategy. The homoarm star-shaped hybrid POSS-(PPI) 8 was first obtained by the click reaction between azide-modified POSS (POSS-(N 3 ) 8 ) and alkynyl-modified PPI (PPI-Alkynyl). The hybrid POSS-(PPI) 8 was with predominated left-handed helical conformation and exhibited excellent ability in the enantioselective crystallization of racemic compounds. In the meantime, heteroarm star-shaped hybrid (PEG) 4 -POSS-(PPI) 4 was prepared by the click reaction of POSS-(N 3 ) 8 with PPI-Alkynyl and alkynyl-modified poly (ethylene glycol) (PEG-Alkynyl). The hybrid (PEG) 4 -POSS-(PPI) 4 was amphiphilic, and it could self-assemble to form spherical micelles in aqueous solutions.
研究领域:
高分子化学
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材料科学
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DOI
PubMed
高影响因子
DYES AND PIGMENTS
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2020
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IF 4.613
Furan Zou,Huaxu Ling,Lei Zhou,FangFang Wang,Ying Li
Herein, we demonstrate a successful preparation method of ionic liquid functionalized POSS hybrids by quaternization of imidazole salt with Octa-(ɤ-chloropropyl) POSS. A novel photofunctional hybrid soft material POSS- min-[Eu(tta) 4 ] (tta:2-thenoyltrifluoroacetone) was reported via an ion-exchange reaction between imidazolium-based POSS(POSS-min-Cl) and lanthanide complex [Eu(tta) 4 ] - . The obtained hybrids were extensively characterized by FT-IR, 1 HNMR, 13 CNMR, UV–Vis, PL and TGA in detail. What's more, POSS-min-[Eu(tta) 4 ] displays higher fluorescence intensity , longer lifetime and higher thermostability than corresponding pure complex. More significantly, POSS-min-[Eu(tta) 4 ] exhibits the improvement of photo physical properties (ƞ = 53.73 %) and is selected as the representative sample to examine the potential fluorescence sensing of metal cations. The hybrid POSS-min-[Eu(tta) 4 ] has selective fluorescent quenching effect for different metal ions, especially for Cu 2+ . These results provide meaningful data for the multi-component assembly and responsive luminescent of photo functional hybrids based on modified ionic liquid and lanthanide, which can be expected to have potential application in organic light-emitting devices(OLED) or sensor.
研究领域:
材料科学
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化学传感器
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光学材料
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
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2023
·Vol. 63
·期 5
·1507-1515
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IF 3.2
Heng Li,Fang-Yu Ren,Hong-Ru Li,Liang-Nian He
Biomass-based polymers and their property regulation using functional materials have attracted much interest. In this work, ricinoleic acid-derived cyclic carbonate was prepared and applied to the synthesis of nonisocyanate polyurethane (NIPU) with aliphatic diamine, in which octa(aminopropyl) polyhedral oligomeric silsesquioxane (OAP-POSS) was incorporated as polyamine to partially or totally substitutes for the diamine to introduce POSS units into the polymer thus regulating the properties of the resultant material. In the curing process, Fourier transform infrared spectroscopy (FT-IR) was used to track the reaction and curing at 50°C for 12 h was found to be sufficient for the polymerization. A series of POSS modified NIPUs were obtained by altering the molar fraction of OAP-POSS in total amine components and the material with the highest thermal stability, shore hardness and water resistance was accessed with 100% substitution of OAP-POSS for diamine.
研究领域:
材料科学
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生物质化学
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DOI
高影响因子
JOURNAL OF DENTISTRY
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2026
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IF 5.8
Meng Wei,QiQi Hu,Qi Xie,TianQi Wang,WeiLi Xie
Introduction The aim of this study was to develop a novel antibacterial dental composite resin by loading chlorhexidine (CHX) onto bioactive glass (BG 45S5) and incorporating it into a resin matrix containing cage-type polyhedral oligomeric silsesquioxane (POSS) nanomonomers. Methods CHX was loaded onto the surface of BG 45S5 using a blending method to obtain experimental groups with different CHX concentrations. Experimental composite resins were prepared by incorporating 20 wt% CHX-loaded BG 45S5 and 40 wt% SiO₂ as inorganic fillers into a matrix containing 4 wt% POSS nanomonomer. Materials characterization were performed using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), with analysis of double-bond conversion. Mechanical properties were evaluated using a universal testing machine, and fracture mechanisms were analyzed by SEM. In vitro drug release was assessed to determine chlorhexidine release behavior. Biocompatibility was evaluated using CCK-8 assays, acute oral systemic toxicity tests, and oral mucosal irritation tests. Antimicrobial activity was assessed using bacterial growth assays, agar plate counting, and the plate diffusion method. Results Increasing chlorhexidine concentration resulted in particle agglomeration, reduced double-bond conversion rate, and decreased mechanical strength. Compressive strength of C 2 differed significantly from that of C 0 ( p < 0.05), whereas flexural strength showed no significant difference ( p > 0.05). At a chlorhexidine loading concentration of 2%, the composite resin demonstrated acceptable mechanical properties. In vitro drug release demonstrated an initial rapid release phase followed by a sustained and slower release. Furthermore, CCK-8 assays showed that C 2 maintained comparable cell viability to C0 at 24, 48, and 72 h ( p > 0.05). In vivo evaluations revealed no significant systemic toxicity or oral mucosal irritation. C 2 exhibited significant antibacterial activity compared with C 0 ( p < 0.05). Conclusions Incorporation of 2% CHX-loaded bioactive glass 45S5 into a POSS-modified composite resin maintained acceptable mechanical performance and provided sustained drug release, biocompatibility, and significant antibacterial activity. Clinical Significance The modified composite resin with a low CHX loading concentration demonstrated antibacterial activity while maintaining acceptable mechanical performance and biocompatibility, suggesting its potential application as a bioactive restorative material.
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PubMed
高影响因子
Small
·
2026
·
IF 11.8
Yuanyuan Tong,Mengshi Jin,Shuai Lv,Rui Zhang,Yuan Yuan,Xueqin Zhang,Baoping Lin,Tao Jiang,Bo Li,Ying Sun
Ice accretion on critical infrastructure threatens operational safety and energy efficiency, necessitating durable anti-icing coatings. While slippery liquid-infused porous surfaces (SLIPS) exhibit low ice adhesion, lubricant depletion compromises their durability. Crosslinked polymer networks improve longevity, yet the low modulus of polydimethylsiloxane (PDMS) induces structural fatigue. To reconcile liquid storage, icephobic performance and mechanical robustness, this study integrates polyhedral oligomeric silsesquioxane (POSS) as rigid skeletal nodes within a silicone elastomer matrix. Direct hydrosilylation achieves a 5 wt.% POSS loading limit; subsequent tetrafunctional siloxane modification increases this to 7.5 wt.% through enhanced compatibility and crosslinking density. This optimized network enables homogeneous nanodomain dispersion, doubled liquid loading, and enhanced storage stability via a solid-phase liquid storage–liquid-phase lubrication–interfacial self-replenishment ternary mechanism. The composite exhibits initial ice adhesion < 2 kPa, freezing delay of 765 s at −20°C, ice nucleation temperature of −21°C, recalescence time of 180 s, and < 20 kPa adhesion after 450 cycles, alongside a dielectric constant of 2.5. Rigorous durability tests confirm < 20 kPa adhesion, with broad substrate compatibility, self-cleaning, and anti-condensation functionality. This strategy effectively balances liquid storage capacity with mechanical robustness for scalable anti-icing applications.
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高影响因子
Polymers
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2021
·Vol. 13
·期 8
·1182
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IF 4.329
Degang Wang,Jie Ding,Bing Wang,Yingluo Zhuang,Zhixiong Huang
In this paper, a new polyhedral oligomeric silsesquioxane containing a phenol group (POSS-Phenol) is prepared through the Michael addition reaction, which is added to the synthesis of phenolic resin as a functional monomer. Infrared spectroscopy (IR) is used to demonstrate the chemistry structure of the synthesized POSS modified phenolic resin. After introducing POSS into the resole, a comprehensive study is conducted to reveal the effects of POSS on the thermal degradation of phenolic resin. First, thermal degradation behaviors of neat phenolic resin and modified phenolic resin are carried out by thermogravimetric analysis (TGA). Then, the gas volatiles from thermal degradation are investigated by thermogravimetric mass spectrometry (TG-MS). Finally, the residues after thermal degradation are characterized by X-ray diffraction (XRD). The research indicates that POSS modified phenolic resin shows a better thermal stability than neat phenolic resin, especially at high temperatures under air atmosphere. On the one hand, the introduction of the POSS group can effectively improve the release temperature of oxygen containing volatiles. On the other hand, the POSS group forms silica at high temperatures under air, which can effectively inhibit the thermal oxidation of phenolic resin and make phenolic resin show a better high-temperature oxidation resistance.Keywords:polyhedral oligomeric silsesquioxane;phenolic resin;thermal degradation;residual char yield
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
Polymers
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2021
·Vol. 13
·期 2
·196
·
IF 4.329
Wensi Li,Shengyu Feng
This study reports a novel series of imidazolium ionic liquids (ILs) based on polyhedral oligomeric silsesquioxanes (POSS) towards effective detection of metal ions, especially Fe3+ ion.1H,13C,29Si NMR, high resolution mass spectra (HRMS) and Fourier transform infrared spectra (FTIR) were applied to confirm the structures of the ILs based on POSS (ILs-POSS). The three ILs-POSS were synthesized via a green chemistry approach—a thiol-ene “click” reaction without metal ions as catalysts. Furthermore, the spherical vesicle structures of the ILs-POSS were observed and caused by self-assembly behaviors. Through comprehensive characterizations, these ILs-POSS have performed excellent thermal stabilities and low glass transition temperatures. In addition, we found it very meaningful that the limits of detection (LODs) of the three ILs-POSS for the detection of the Fe3+ion were 7.91 × 10−8M, 1.2 × 10−7M, and 1.2 × 10−7M, respectively. These data illustrate that these ILs-POSS have great potential for the detection of the Fe3+ion. In conclusion, this study not only prepared novel ILs-POSS, but also provided new materials as fluorescent sensors in the detection of Fe3+.Keywords:ionic liquids;thiol-ene “click” reaction;polyhedral oligomeric silsesquioxanes;fluorescent sensors
研究领域:
化学
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材料科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF CARBOHYDRATE CHEMISTRY
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2014
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IF 1.183
Hongxia Liu,Xiaojian Li,Shiqi Wang,Shaojun Huang,Chun Wei,Jian Lv
Microcrystalline cellulose extracted from sisal fibers (SFMCC) and octa-aminopropyl polyhedral oligomeric silsesquioxane (POSS-NH2) were used to fabricate POSS/SFMCC hybrids through a simple cross-linking process with epichlorohydrin as the cross-linking agent. The chemical structure and morphology of hybrids are characterized with FTIR spectra, X-ray diffraction, and SEM. The results present that POSS-NH2 has been grafted onto the surface of SFMCC. The thermal property of hybrids has been improved with a 19°C higher maximum thermal decomposition temperature than SFMCC, as measured by TGA and DSC. The residual mass of hybrids and SFMCC were 15.6 wt% and 4.4wt% at 700°C, respectively.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2024
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IF 12.7
Kerong Yang,Jinyue Dai,Weiwei Zhao,Shuaipeng Wang,Xiaoqing Liu
In the ultra-high voltage, ultra-high capacity and high frequency energy systems , epoxy-based dielectric materials demonstrating high breakdown strength and low dielectric loss are urgently needed. This work reports a strategy to modulate the charge trap depth in bio-based epoxy dielectric materials by tailoring the local molecular chain structures, ultimately leading to the significant suppression of high-field conductivity and dielectric loss. With the introduction of octa (dimethylsiloxy)octasilsiloxane (POSS) as the intrinsic molecular charge traps, our synthesized epoxy dielectric material exhibits a high breakdown strength of E b-DC = 81.5 kV/mm, 37 % higher than the traditional bisphenol A epoxy resin (DGEBA), and low dielectric loss of tan δ = 0.0022, 45 % lower than that DGEBA. Furthermore, simulation results give the structure-property relationships, guiding the molecular design. Specifically, the dielectric properties are positively correlated with the LUMO energy difference and charge separation index of the polymer molecular chains. This work provides a promising pathway to enhance the dielectric properties of polymers by building intrinsic molecular charge traps, which is prospective for practical electronics and electrical power systems.
研究领域:
材料科学
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电气工程
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Mei Chen,Yuming Chen,Wei Li,Peng Liang,Congjing Ren,Binbo Jiang,Jingdai Wang,Yongrong Yang
A facilely catalytic approach to prepare weakly entangled ultra-high-molecular-weight polyethylene (UHMWPE) with a fine particle size is reported with the polyhedral oligomeric silsesquioxane (POSS)-modified MgCl2-based Ziegler–Natta catalyst. CO in situ FTIR spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and N2 adsorption and desorption experiments revealed that the POSSs can coordinate with the MgCl2(110) plane, acting as adhesives with a cage structure to be in situ embedded into the MgCl2-based support. This in situ embedding of POSS facilitated the uniform dispersion of POSS nanoparticles, contributing the isolation effect for active TiCl4 sites in the molecular scale, thus synthesizing the weakly entangled UHMWPE with exceptional activities. Simultaneously, the MgCl2-based catalysts afforded UHMWPE particles with small sizes, where POSS-modified catalysts brought the UHMWPE particle size down to below 200 μm, thanks to their considerable activities. To the best of our knowledge, this is the first time that nascent UHMWPE with a less entangled state and a fine particle size was synthesized. This combination of structural advantages enables substantial improvements in the toughness/stiffness/strength balance of nascent UHMWPE, especially for the impact strength which can reach 113.6 kJ/m2 with a relatively low molecular weight.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2024
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IF 8.3
Yongke Tan,Junhui Liu,Yujing Li,Qi Wang,Weibo Zhou,Yuhui Ao,Ming Li
The high strength and toughness of Carbon Fiber-Reinforced Polymers (CFRPs) are the main requirements for their properties in various fields. Herein, the “soft-rigid-soft” structure has been designed by us to achieve the aim of the improvement for the CFRP strength and toughness simultaneously. The soft-rigid-soft structural interface layer of CF was firstly constructed by carbon nanotubes (CNT) and Tannin/Aminopropyl isobutyl POSS (TA/NH 2 -POSS). The interfacial shear strength (IFSS) of the modified carbon fiber composite was 111.94 MPa, which was 84.08 % higher than that of the untreated fiber (60.81 MPa). Moreover the interlaminar shear strength(ILSS) and impact strength were increased by 50.43 % and 80.37 %. Enhancement of interface performance is mainly ascribed to CNT and TA/NH 2 -POSS, because they can effectively which is more effective to consume energy and decentralize stress. In this paper, the strength and toughness of CFRPs ware effectively improved by the in-depth and detailed design of the “soft-rigid-soft” multi-scale structure.
研究领域:
材料科学
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力学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）