POLYMER
·
2024
·
IF 4.1
Zaoxia Wen,Liang Xu,Xingyu Liu,Linxuan Fang,Lianbin Wu
A novel method was developed for constructing cross-linked silsesquioxane, utilizing Q-type H-POSS as a precursor. The Piers-Rubinsztajn (P–R) like reaction of Q-type H-POSS was catalyzed by B(C 6 F 5 ) 3 , resulting in the production of a prepolymer containing partial Si–H. Upon heating at high temperature in air, the prepolymer transformed into an insoluble and infusible cross-linked polymer, named Cured poly(H-POSS). This polymer exhibited high thermostability, with a 5 % weight loss temperature ( T 5d ) of 709 °C and a residue of 92 % at 800 °C. Additionally, Cured poly(H-POSS) exhibited high transparency, with a transmittance of 90 % in the 400–800 nm wavelength range, and favorable dielectric properties, with a dielectric constant ( D k ) of 2.88 at 14 GHz.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bo Li,Rui Shi,Zhongzhi Wang,Xin Qiao,Leijun Shen,Liqun Shi
Rare earth luminescent complexes encounter defects such as poor thermal stability, poor dispersibility, and easy quenching of fluorescence emission by water in practical applications. To improve these defects, we innovatively propose using polyhedral oligomeric silsesquioxane (POSS) to enhance the performance of rare earth complexes. We designed and prepared POSS-MAA-EuL composite materials. POSS is modified with long chains containing -COOH functional groups, allowing it to bind with rare earth complexes through coordination interactions. Experimental results have shown that the combination of POSS not only improves the dispersibility of rare earth complexes, but also enhances their thermal stability. It is worth noting that the binding of POSS endows rare earth complexes with the ability of resisting fluorescence emission quenching by water. When the same volume of deionized water is added (2000 μL), the fluorescence of rare earth complex is almost completely quenched, with a quenching efficiency of 99.0 %, while the quenching efficiency of POSS-MAA-EuL is only 39.2 %. There are few reports on improving the water quenching resistance of rare earth luminescent complexes by combining with POSS. Therefore, this work provides a new way to improve the performance of rare earth complexes.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Hongjie Zhao,Ran Wang,Huizhen Deng,Lijun Zhang,Lili Gao,Lexin Zhang,Tifeng Jiao
In this work, a new nanocomposite based on octa-amino polyhedral oligomeric silsesquioxanes (POSS), carbon nanotubes (CNTs), and chitosan (CS) was synthesized and used for wastewater treatment. The properties and morphologies of the prepared composite were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscope, thermogravimetric, and atomic force microscopy. The results showed that POSS, CNTs, and CS formed a stable composite through intermolecular forces, and the modification of CS by POSS and CNTs improved its stability. In addition, the obtained composite showed good adsorption performance for the degradation of methyl orange and Congo red dyes. The pseudo-first-order model and pseudo-second-order model were used to analyze the adsorption data, and the results showed that the adsorption process conforms to the kinetic model. Moreover, the maximum adsorption capacity of the composite to methyl orange and Congo red reached 63.23 and 314.97 mg/g, respectively. This work provides new ideas for the preparation of self-assembled multi-composite and their potential applications in wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Xiaoxiao Ji,Jinhui Wang,Zhiming Wang,Bowei Mao,Yizhong Cao,Yanjun Xie,Yutao Yan
Bamboo-based composite, being an eco-friendly green material, has garnered widespread utilization across diverse sectors including construction and domestic appliances owing to its impressive strength, innate aesthetic appeal, and wear resistance. However, it tends to crack at bonding interface between bamboo and the brittle resin adhesive due to stress concentration, reducing its mechanical properties and lifespan. To address this issue, the epoxy-based polyhedral oligomeric silsesquioxane (POSS) was incorporated to modify the phenol-formaldehyde (PF) resin and improve the interfacial bonding strength. And the results showed that the incorporation of 5% epoxy-POSS could markedly increase the impact and flexural strength of the modified PF resin by 75.7% and 27.6%, respectively, in contrast to the original PF resin. Moreover, the dry and wet shear strength of bamboo-PF composites bonded by the POSS modified PF resin adhesive was also apparently improved by 17.03% and 28.55%, respectively. The increased toughness and bonding strength were mainly attributed to the nano-effect of POSS and good compatibility and cross-linking reaction with the PF resin, which helped dissipate energy and avoid stress concentration within the PF resin and at the bonding interface. This study aims to address the cracking problem of bamboo-based composites and extend their longevity in architectural and domestic applications. Highlights Epoxy-POSS disperse well in PF resin due to its unique multi-epoxy structure. Epoxy-POSS can react with PF resin and effectively improve its toughness. Nano-effect and cross-linking effect enable dissipate energy and disperses stress. Modification increased bonding strength and decreased interfacial cracking.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2019
·Vol. 15
·期 47
·9727-9732
·
IF 3.399
Guanzhou Luo,Li Wang,Xinying Li,Kai Yang,Yongle Luo,Shouping Xu,Pihui Pi,Xiufang Wen
A facile method that combines alkali-assisted oxidation and –SH chelation with a click chemistry reaction was employed to create an F-POSS polymer surface (fluorinated octavinyl polyhedral oligomeric silsesquioxane polymer)-based Cu mesh (F-POSS-OM). The as-prepared F-POSS-OM surface displayed a cohering hierarchical nano-F-POSS polymer granule/micro-Cu(OH)2 wire structure, which provided a re-entrant geometry needed for liquid-repellency and low liquid sliding angles (<15°). Moreover, the easy-prepared structure endows the F-POSS-OM with remarkable durability for mechanical and chemical damages, including wear abrasion, tape-peeling, 100 cm-height hammer impact, severe hand twisting, strong acid/base/salt solutions, and high temperatures. Importantly, F-POSS-OM still retained excellent self-cleaning performance even after being subjected to these damages.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Zhijie Zhang,Lin Gou,Changjiang Zhao,Tian Zhang,Huan Li,Kongying Zhu,Xingjiang Liu,Qiang Xu
The dissociation degree of lithium electrolyte salts greatly affects the performance of solid-state polymer electrolytes (SSPE) in solid-state lithium-metal batteries (SSLBs). The previous synthetic tactics are generally based on single dissociation of electrolyte salt, for example, solely tethering the anions or capturing lithium cations. Herein, we present a dual-dissociation strategy to synthesize SSPE by simultaneously dissociate both the anions and cations among electrolyte salts. This is achieved by integrating the oligomeric silsesquioxanes (POSS) nanoparticles with suitable aperture in a poly(propylene carbonate) (PPC) gel matrix, where the POSS filler with suitable aperture interacts with both the TFSI anions and Li + cations of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. However, the Li + cations are movable under an external electric field and can migrate between cathode and anode to achieve charge transportations. The room temperature ionic conductivity of SSPE filled with POSS nanoparticles was found to be superior to that of SSPE with SiO 2 fillers, with a conductivity value of 2.04 × 10 −4 S cm −1 and a higher Li + ion transfer number of 0.71. This improvement is attributed to the utilization of a dual-dissociation strategy of lithium salt . The theoretical computations with nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) manifest that the efficient dissociation of electrolyte salt is ascribed to the coordination effect of Li + ions with four oxygen atoms among POSS cage as well as the tethering function of POSS filler for TFSI − anions. This work provides an innovative dual-dissociation strategy to synthesize SSPE, which would benefit the practical use of polymer electrolytes in solid-state lithium-metal batteries.
研究领域:
材料科学
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电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Daomin Min,Haozhe Cui,Yali Hai,Pengxin Li,Zhaoliang Xing,Chong Zhang,Shengtao Li
Interfacial regions formed by incorporating a certain percentage of nanofillers into a polymer matrix can impact on the motion of molecular groups, chain units or chain segments, and alter molecular chain network dynamics, which is regarded as a key factor to achieve a finer degree control of dielectric properties of polymer nanocomposites . It is of interest to investigate the molecular chain motion behavior at interfacial regions with the incorporation of nanofillers. Epoxy resin/polyhedral oligomeric silsesquioxane (EP/POSS) nanocomposites are fabricated and the observations of morphology structure and chemical elements indicate that POSS nanofillers are well dispersed in the matrix. Differential scanning calorimeter , dynamic thermomechanical analysis, and dielectric relaxation spectroscopy are measured to analyze the effect of nanodoping on the motion properties of molecular chain units and chain segments that satisfy the Arrhenius and Vogel-Fulcher-Tammann equations respectively. The thicknesses of interfacial regions between POSS nanofillers and EP matrix are estimated from dielectric spectra and effective relative permittivity simulations, which are around several nanometers and decrease with the increment in the nanofiller content. In addition, the dielectric spectra scaling analysis indicates that the motion of small chain units can be hindered in interfacial regions and be tuned simultaneously by the variations of molecular chain network structure and dynamics. Nevertheless, the thin interfacial regions cannot effectively restrict the orientation of long molecular chain segments during the glass transition process. The variation of chain segment orientation behavior is ascribed to the interactions among molecular chains tuned by the binding effect of POSS nanofillers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2022
·
IF 2.676
Zemin He,Ping Yu,Yuzhen Zhao,Qing Yang,Yang Zhao,Huimin Zhang,Shuai Zi,Zongcheng Miao,Haiquan Zhang,Wenbo Shen
In this paper, we report a simple and effective technique to improve the electro-optical performance of polymer-dispersed liquid crystal (PDLC) films via the implantation of polyhedral oligomeric silsesquioxane (POSS) microstructure into the polymer matrix. The measurement results of the electro-optical properties indicated that the electro-optical performances of PDLC films have been regulated successfully via the implantation of POSS microstructure into the polymer matrix. SEM results suggested that the size of polymer meshes was broadened with the increase in the content of POSS microstructure, while the static water contact angles of the polymers increased after the implantation of POSS microstructure. Because of the lower surface energy as well as the increased steric repulsions between liquid crystal molecules and polymer surfaces, the anchoring effect of the polymer matrix containing POSS microstructure was concluded to be weakened, which was the dominant factor in achieving the dramatic regulation effect of the electro-optical properties of the PDLC films. This work could provide a creative approach for the fabrication of low voltage-driven PDLC films for their practical applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 9
·1363
·
IF 4.329
Xu Han,Xiaohua Zhang,Ying Guo,Xianyuan Liu,Xiaojuan Zhao,Heng Zhou,Songli Zhang,Tong Zhao
The cage and ladder structured phosphorus-containing polyhedral oligomeric silsesquioxanes (DOPO-POSS) have been synthesized through the hydrolytic condensation of 9,10-dihydro-9-oxa-10-phosphenanthrene-10-oxide (DOPO)-vinyl triethoxysilane (VTES). The unique ladder and cage–ladder structured components in DOPO-POSS endowed it with good solubility in vinyl epoxy resin (VE), and it was used with tetrabutyl titanate (TBT) to construct a phosphorus-silicon-titanium synergy system for the flame retardation of VE. Thermal stabilities, mechanical properties, and flame retardancy of the resultant VE composites were investigated by thermal gravimetric analysis (TGA), dynamic mechanical analysis (DMA), three-point bending tests, limiting oxygen index (LOI) measurement, and cone calorimetry. The experimental results showed that with the addition of only 4 wt% DOPO-POSS and 0.5 wt% TBT, the limiting oxygen index value (LOI) increased from 19.5 of pure VE to 24.2. With the addition of DOPO-POSS and TBT, the peak heat release rate (PHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP) were decreased significantly compared to VE-0. In addition, the VE composites showed improved thermal stabilities and mechanical properties comparable to that of the VE-0. The investigations on pyrolysis volatiles of cured VE further revealed that DOPO-POSS and TBT exerted flame retardant effects in gas phase. The results of char residue of the VE composites by SEM and XPS showed that TBT and DOPO-POSS can accelerate the char formation during the combustion, forming an interior char layer with the honeycomb cavity structure and dense exterior char layer, making the char strong with the formation of Si-O-Ti and Ti-O-P structures.Keywords:vinyl epoxy resin;flame retardant;thermal stability;mechanical properties
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Fuwei Liang,Yang Xu,Shun Chen,Yalin Zhu,Yaxun Huang,Bin Fei,Wenwen Guo
The facile construction of a cotton fabric with excellent flame-retardant and water-proof abilities is of great interest for multitask requirements. Herein, a nonfluorine, highly efficient, and cost-effective multifunctional cotton fabric was fabricated via sequentially depositing a novel multielement-containing flame-retardant phosphorylated octa-aminopropyl POSS (PPA-POSS) and a fluorine-free superhydrophobic coating of zeolitic imidazolate framework-67@poly(dimethylsiloxane) (ZIF-67@PDMS). Influences of the PPA-POSS concentration and ZIF-67@PDMS formula on the fire retardancy and water repellency of treated cotton were systematically investigated. The optimized flame-retardant sample CTF3 with 6.2 wt % PPA-POSS exhibited a high limiting oxygen index (LOI) of 34% and self-extinguishing ability. CTF3 was further modified with a properly formulated superhydrophobic ZIF-67@PDMS coating. CTF3-PHB2 displayed enhanced thermal stability, flame retardancy, and outstanding superhydrophobicity. Thermogravimetric analysis (TGA) results demonstrated that CTF3-PHB2 presented a high char residue of 35.9%, which was 220.5% higher than that of the control cotton (11.2%). More importantly, the heat release rate (HRR), total heat release (THR), and average effective heat of combustion (av-EHC) values of CTF3-PHB2 were significantly reduced by 51.4, 56.2, and 68.4%, respectively, compared with those of a pure cotton fabric. Moreover, CTF3-PHB2 showed superhydrophobicity (WCA > 159.3°) and good mechanical abrasion resistance. In addition, CTF3-PHB2 also showed protective abilities such as antifouling, self-cleaning, and water/oil separation performances even for strong acid/alkali mixtures. Thereby, it is believed that the PPA-POSS@ZIF-67@PDMS coating is promising for application in multifunctional textile materials.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Zhixuan Zhang,Tong Cao,Hanrong Wu,Ailin Peng,Lifen Tong,Xiaobo Liu,Yumin Huang
The continuous progress of microelectronic technology requires polymer materials with low dielectric constant, low dielectric loss, excellent mechanical properties and heat stability. As an emerging advanced polymer, poly(arylene ether nitrile) has shown great potential in the field of microelectronics. However, there is still a need to decrease its inherent dielectric constant and dielectric loss. In this work, the cross-linked poly(arylene ether nitrile) containing propenyl and trifluoromethyl groups (PEN) was designed and synthesized. Then the cage-like structure of octaphenyl polyhedral oligomeric silsesquioxane (OPOSS) was introduced to prepare the composite membranes by solution-casting method. After undergoing thermal treatment, dual cross-linked networks were formed, with OPOSS securely embedded within them. The results show that the composite films exhibit significantly enhanced heat stability (T 5% ≥ 491 °C), tensile strength (≥72 MPa) and remain great hydrophobicity (106.6–114.2°). More importantly, among all the composite films, the dielectric constant and dielectric loss of the CPEN/OPOSS-8 composite film are as low as 2.19 and 0.0025 at 1 MHz, respectively. Such excellent comprehensive performance, especially in low dielectric constant while obtaining ultra-low dielectric loss, will make it possible to be used as a low dielectric material. This strategy will open up a new way of thinking for the development of low dielectric materials.
研究领域:
材料科学
·
高分子化学
·
微电子技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 44
·11729-11734
·
IF 4.696
Qiyang Jiang,Weihai Zhang,Jinmeng Hao,Yanfeng Wei,Jianxin Mu,Zhenhua Jiang
This work focuses on the design of unique “cage–cage” shaped low dielectric constant and hydrophobic materials with nano-sized pores and few polarizable groups. Therefore, a novel double-decker structural fluorinated POSS was first synthesized, which then reacted with a diphenol POSS to produce linear hybrid polymers. When the merits of fluoride and nanoporous structures are combined, the dielectric constant of the hybrid material decreases significantly (2.24 at 1 MHz) and a low surface energy (contact angle of 107° in water) of the material, as well as good solubility and thermal properties are obtained.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）