POLYMER COMPOSITES
·
2018
·Vol. 40
·期 7
·2768-2776
·
IF 1.943
Di Liu,Li Yuan,Hongyue Xu,Huafeng Tian,Aimin Xiang
As one kind of novel nanomaterial, polyhedral oligomeric silsesquioxane (POSS) can improve the thermal stability, water resistance, and mechanical properties of the composites when introduced into a polymer matrix. In this work, we carried a novel method to fabricate polymeric nanocomposite films from poly(vinyl alcohol) (PVA) by grafting octa(−chloropropyl) POSS using sodium hydroxide (NaOH) as a catalyst. Fourier transform infrared (FTIR) and 1 H nuclear magnetic resonance ( 1 H NMR) spectral analysis confirmed the structure of POSS-graft-PVA (POSS-g-PVA) nanoparticles. For the cast nanocomposite films, transmission electron microscopy (TEM) micrographs revealed that good POSS dispersion/distribution into PVA matrix was achieved, leading to substantial improvement of mechanical properties, reduced water absorption, and enhanced thermal stability. The chemical grafting of PVA on the nanoparticles plays an important role in improving these properties compared with conventional filled composites. POLYM. COMPOS., 40:2768–2776, 2019. © 2018 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Leixin Yang,Zhizhang Tian,Xiyuan Zhang,Xingyu Wu,Yingzhen Wu,Yanan Wang,Dongdong Peng,Shaofei Wang,Hong Wu,Zhongyi Jiang
The urgent demand of capturing CO 2 from energy relevant applications stimulated researchers to develop novel high-performance membrane materials. PIM-1, a representative class of polymers of intrinsic microporosity (PIMs), possesses high permeability but low selectivity due to its highly twisted ladder-like structure. A facile approach to improve CO 2 separation performance of PIM-1 is to implant CO 2 -philic fillers. In this study, a novel nano-sized filler Poly(ethylene glycol) functionalized Polyhedral oligomeric (PEG-POSS), with PEG anchored on POSS was incorporated into PIM-1 membrane at nanoscale level to increment CO 2 selectivities of the membrane. The as-prepared PIM-1/PEG-POSS mixed matrix membranes (MMMs) were characterized by Fourier transform infrared (FT-IR) spectra, thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Single gas permeabilities of N 2 , CH 4 and CO 2 were measured by the time-lag method. PIM-1/PEG-POSS membranes showed enhanced CO 2 selectivity over CH 4 and N 2 at high PEG-POSS loadings. Specifically, the PIM-1/PEG-POSS membrane with 10 wt% PEG-POSS nanoparticles exhibited the optimal separation performance, of which the CO 2 permeability reached 1300 Barrer and CO 2 /CH 4 selectivity increased by 150% compared with the pristine PIM-1, which surpassed the 2008 Robeson upper bound. The as-prepared PIM-1/PEG-POSS MMMs show great potential for CO 2 capture.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 44
·11395-11402
·
IF 5.256
Yongyun Mao,Qian Zhao,Jianchang Wu,Tingting Pan,Bingpu Zhou,Yanqing Tian
Organic–inorganic hybrid 3-(trimethoxysily)propylmethacrylate-co-platinum porphyrin-co-methacrylolsobutyl-polyhedral oligomeric silsesquioxane (TPMA-PtTPP-POSS) copolymer films were synthesized and applied as high-performance oxygen sensors. High sensitivity and fast response characteristics originate from the POSS-containing copolymer composition and wormlike structures. The wormlike structures composed of the POSS-containing copolymers self-assembled on the film surface can ensure the homogeneous dispersion of PtTPP and can be perturbed by a trace oxygen environment. Compared with the state-of-the-art PtTPP-TPMA film, the TPMA-PtTPP-POSS copolymer sensors exhibit a swift response (approx. 0.6 s), long-term stability, higher sensitivity (increased by 4-fold), and a relatively large dynamic range, etc. We believe that the POSS-containing hybrid films should provide a new strategy for designing sensitive and fast responding optical oxygen sensors.
研究领域:
材料科学
·
化学传感器
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2020
·
IF 4.271
Lei Sun,Ming Cao,Fan Xiao,Jiaopeng Xu,Yingbo Chen
Frictional and wear properties of polyamide 6 (PA6) are very important for its use as anengineering plastic. In this study, octaamino-polyhedral oligomeric silsesquioxane (POSS) functionalized graphene oxide (GO) was used to fabricate a PA6/reduced GO-POSS (rGO-POSS) nanocomposites. Compared with PA6, the PA6/rGO-POSS nanocomposites with 0.3 wt% GO-POSS has a decrease of friction coefficient by 86.36% from 0.44 to 0.06. The depth and width of the wear scar were reduced by 79.64% and 70.69%, respectively. Meanwhile, the wear rate reached the lowest and dropped by about 65.72%. The research found that GO-POSS is self-fixed in the matrix and effectively increases the interface bonding strength .
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Shengrui Zhou,Li Zhang,Guan Wang,Bilal Iqbal Ayubi,Yiwei Wang
Fluorinated polyimide (FPI) is widely used in high-frequency electronic devices and aerospace applications due to its outstanding insulation properties and chemical stability. However, its degradation mechanisms under electro-thermal aging remain poorly understood. Polyhedral oligomeric silsesquioxane (POSS), as a nanofiller, offers excellent thermal stability and flame retardancy, yet studies on the electro-thermal aging resistance and chemical transformation mechanisms of FPI/POSS nanocomposites are still limited. This study employs reactive molecular dynamics (ReaxFF-MD) simulations, combined with vibrational energy distribution analysis, to investigate the electro-thermal aging mechanisms of FPI/POSS nanocomposites. Additionally, density functional theory (DFT) is used to examine the electron transfer pathways of FPI molecules and the reactive site changes in POSS cages under electric fields. The results demonstrate that POSS achieves higher vibrational energy and structural stability under electro-thermal conditions, significantly raising the thermal decomposition threshold of FPI molecular chains. This reduces the release of volatile products and substantially enhances the electro-thermal aging resistance of the composites.
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
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Leixin Yang,Xinyu Liu,Hong Wu,Shaofei Wang,Xu Liang,Liang Ma,Yanxiong Ren,Yingzhen Wu,Yutao Liu,Mingze Sun,Zhongyi Jiang
Graphene oxide (GO) membranes with two-dimensional (2D) interlaminar channels display fascinating properties in gas separation where the separation efficiency is governed by the size and interlayer interactions of 2D channels. Incorporating intercalators into GO interlayers is recognized as an effective strategy to create appropriate microenvironments for biogas upgrading (remove CO 2 from raw biogas, specifically CO 2 /CH 4 separation). Herein, we proposed a strategy of using a kind of nanocage, amino-functionalized polyhedral oligomeric silsesquioxane (POSS–NH 2 ), as versatile intercalator to regulate the channel structure and afford favorable microenvironments for CO 2 /CH 4 separation in GO membranes. The channel size of GO membranes was reduced from 9.1 Å to 4.7 Å by POSS-NH 2 crosslinking, which could elevate the diffusion selectivity of CO 2 /CH 4 . The amino groups on POSS-NH 2 are able to react with CO 2 reversibly, facilitating the transport of CO 2 . Through synergistically intensifying diffusion selective and facilitated transport mechanisms, the optimized membrane CO 2 /CH 4 selectivity reached 74.5, which is superior to most reported values of 2D membranes. Moreover, we selected another POSS intercalator without amino groups, in order to distinguish the contribution of physical and chemical mechanisms to selectivity. Our study may provide a novel avenue in designing versatile intercalators to construct high-performance 2D membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 8
·49870
·
IF 2.52
Shengnan Li,Xiaojuan Zhao,Yu Zhang,Xin Yang,Ran Yu,Ying Zhang,Kuilin Deng,Wei Huang
The cage-ladder-structure phosphorus-containing amino-functionalized polyhedral oligomeric silsesquinoxanes (CLNH 2 -POSS) have been synthesized through a facile catalyst-free hydrolytic condensation of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-vinyltrimethoxysilane (DOPO-VTMS) with 3-aminopropyl trimethoxysilane (KH540). The successful preparation of CLNH 2 -POSS has been proven by the characterization of Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy ( 1 H-NMR, 29 Si-NMR), matrix-assisted laser desorption ionization time of flight (MALDI-TOF), and X-ray diffraction (XRD). Then flame retardant (FR) epoxy resins (EPs) were prepared by the addition of different content of CLNH 2 -POSS into EPs with thermal curing technology. The CLNH 2 -POSS showed good solubility in EP matrix. The well-dispersed CLNH 2 -POSS contributed to thermal, mechanical, and FR properties of EP. Dynamic scanning calorimetry nonisothermal curing scans showed that CLNH 2 -POSS had accelerating effect on the curing of EP. With the addition of only 3 wt% CLNH 2 -POSS (0.30% phosphorus loading), the limiting oxygen index value of the EP composite increased from 25.5 of pure EP to 31.8, and vertical burning (UL-94) V-0 ratings was achieved. In addition, the EP composites showed improved thermal and mechanical properties. The investigations on char residue and pyrolysis volatiles of cured EP further revealed that CLNH 2 -POSS exerted FR effects in condensed and gas phase simultaneously.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 5
·1-14
·
IF 3.097
Hu Rong,He Kaibin,Zheng Xianghong,Zeng Birong,Chen Guorong,Xu Yiting,Yuan Conghui,Luo Weiang,Dai Lizong
Octa-N-phenylaminopropyl-POSS (Octa-NAPA-POSS), DOPO and paraformaldehyde were used to synthesize Octa-DOPO-POSS through the Kabachnik-Fields reaction. It was added into epoxy resin with different ratio to prepare a series of modified epoxy resin composites. The results proved that the addition of flame retardant Octa-DOPO-POSS significantly improved the thermal property, flame retardant performance and moisture resistance of epoxy resin without weakening the mechanical properties. When the addition amount of Octa-DOPO-POSS was 5 wt%, the LOI value of the cured EP/Octa-DOPO-POSS composite increased to 33.9%. Its UL-94 level reached V-0 rating, and the THR and PHRR were significantly reduced. Meanwhile, the flexural modulus and breaking elongation were improved. Moreover, as the adding amount increased the residual char yield of EP/Octa-DOPO-POSS composites also increased, while the maximum thermal weight loss rate gradually decreased. The real-time FTIR and SEM analysis of the char residue after high temperature pyrolysis proved that Octa-DOPO-POSS could promote the char formation and produce a denser char layer. Overall, the combination of POSS and DOPO at a molecular level rather than physical mixing has a positive and significant effect on the flame retardancy of epoxy resin.
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
Polymers
·
2023
·Vol. 15
·期 8
·1936
·
IF 5
Yajun Deng,Changan Zhang,Tao Zhang,Bo Wu,Yanmei Zhang,Jianhua Wu
Waterborne polyurethane are more eco-friendly materials due to lower volatile organic compounds (VOCs, mainly isocyanates) content than the alternative materials. However, these rich hydrophilic groups polymers have not yet reached good mechanical properties, durability and hydrophobicity behaviors. Therefore, hydrophobic waterborne polyurethane has become a research hotspot, attracting significant attention. In this work, firstly, a novel fluorine-containing polyether P(FPO/THF) was synthesized by cationic ring-opening polymerization of 2-(2,2,3,3-tetrafluoro-propoxymethyl)-oxirane (FPO) and tetrahydrofuran (THF). Secondly, fluorinated polymer P(FPO/THF), isophorone diisocyanate (IPDI) and hydroxy-terminated polyhedral oligomeric silsesquioxane (POSS-(OH)8) were used to prepare a new fluorinated waterborne polyurethane (FWPU). Hydroxy-terminated POSS-(OH)8was used as a cross-linking agent, while dimethylolpropionic acid (DMPA) and triethylamine (TEA) were used as a catalyst. Four kinds of waterborne polyurethanes (FWPU0, FWPU1, FWPU3, FWPU5) were obtained by adding different contents of POSS-(OH)8(0%, 1%, 3%, 5%). The structures of the monomers and polymers were verified by1H NMR and FT-IR, and the thermal stabilities of various waterborne polyurethanes were analyzed by thermogravimetric analyzer (TGA) and differential scanning calorimetry (DSC). As the results, the thermal analysis showed that the FWPU performed the good thermal stability and the glass transition temperature could reach at about −50 °C. The FWPU1 film exhibited that the elongation at break was 594.4 ± 3.6% and the tensile strength at break was 13.4 ± 0.7 MPa, elucidating that the FWPU1 film developed the excellent mechanical properties relative to the alternative FWPUs. Further, the FWPU5 film performed the promising properties, including the higher surface roughness of FWPU5 film (8.41 nm) obtained by the atomic force microscope (AFM) analysis, and the higher value of water contact angle (WCA) at 104.3 ± 2.7°. Those results illustrated that the novel POSS-based waterborne polyurethane FWPU containing a fluorine element could develop the excellent hydrophobicity and mechanical properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 2
·205
·
IF 4.4
Hongnian Long,Wenlong Liao,Rui Liu,Ruichi Zeng,Qihan Li,Lihua Zhao
Dielectric materials with superb thermal and electrical properties are highly desired for high-voltage electrical equipment and advanced electronics. Here, we propose a novel strategy to improve the performance of epoxy composites by employing boron nitride nanosheets (BNNSs) and γ-glycidyl ether oxypropyl sesimoxane (G-POSS) as functional fillers. The resultant ternary epoxy composites exhibit high electrical resistivity (1.63 × 1013Ω·cm) and low dielectric loss (<0.01) due to the ultra-low dielectric constants of cage-structure of G-POSS. In addition, a high thermal conductivity of 0.3969 W·m−1·K−1is achieved for the epoxy composites, which is 114.66% higher than that of pure epoxy resin. This can be attributed to the high aspect ratio and excellent thermally conductive characteristics of BNNSs, promoting phonon propagation in the composites. Moreover, the epoxy composite simultaneously possesses remarkable dynamic mechanical properties and thermal stability. It is believed that this work provides a universal strategy for designing and fabricating multifunctional composites using a combination of different functional fillers.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 16
·7206-7215
·
IF 7.394
Xiaoqian Ge,Liang Dong,Lining Sun,Zhengmei Song,Ruoyan Wei,Liyi Shi,Haige Chen
A new and facile method was used to transfer upconversion luminescent nanoparticles from hydrophobic to hydrophilic using polyhedral oligomeric silsesquioxane (POSS) linking on the surface of upconversion nanoparticles. In comparison with the unmodified upconversion nanoparticles, the POSS modified upconversion nanoplatforms [POSS-UCNPs(Er), POSS-UCNPs(Tm)] displayed good monodispersion in water and exhibited good water-solubility, while their particle size did not change substantially. Due to the low cytotoxicity and good biocompatibility as determined by methyl thiazolyl tetrazolium (MTT) assay and histology and hematology analysis, the POSS modified upconversion nanoplatforms were successfully applied to upconversion luminescence imaging of living cells in vitro and nude mouse in vivo (upon excitation at 980 nm). In addition, the doped Gd3+ ion endows the POSS-UCNPs with effective T1 signal enhancement and the POSS-UCNPs were successfully applied to in vivo magnetic resonance imaging (MRI) for a Kunming mouse, which makes them potential MRI positive-contrast agents. More importantly, the corner organic groups of POSS can be easily modified, resulting in kinds of POSS-UCNPs with many potential applications. Therefore, the method and results may provide more exciting opportunities for multimodal bioimaging and multifunctional applications.
研究领域:
生物医学工程
·
纳米医学
·
分子影像学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 16
·7791-7803
·
IF 4.682
Ma Yanli,Wu Hailiang,Shen Yanqin
We herein report novel POSS-containing linear and star multi-arm organic–inorganic hybrid block copolymers (BCPs) L/S -(PGMA- b -PMAPOSS) 1,2,4,6 synthesized by the core-first ATRP method. Following, crosslinking of the BCPs conducted by the reaction of the glycidyl groups in the PGMA block in the presence of trimethylamine to form the 3-dimensional network and the crosslinking cured BCPs were used for the subsequent properties characterization. Based on the chemical structures being confirmed, the self-assembly behaviors in the aqueous solution and film surface property were investigated in detail. The results showed that linear L -(PGMA- b -PMAPOSS) 2 formed typical core–shell spherical micelles where the hydrophobic PMAPOSS blocks as the core and PGMA blocks as the shell. With the increasing number of arms of the hybrid BCPs, the aggregates were tuned from spherical micelles to dendritic cylinders. Besides, with the increases in the solubility of the solvent, the aggregates tended to form the spherical morphology. The hydrophobic property of the hybrid BCPs film improved gradually from linear monobrachial BCPs to star six-arm BCPs. The thermostability of the hybrid BCPs showed similar results owing to the similar MAPOSS proportion. For the adhesive performance to the glass substrate, S -(PGMA- b -PMAPOSS) 6 possessed the best adhesive strength due to the highest density of branches. Graphical abstract
The novel dual-functional linear and star POSS-containing organic-inorganic hybrid block copolymers (BCPs) L/S -(PGMA- b -PMAPOSS) 1,2,4,6 were successfully synthesized by the core-first ATRP method, then crosslinking the BCPs in the presence of trimethylamine to form the 3-dimensional network. And the self-assembly behavior in aqueous solution was studied in detail, as shown in the graphic image. In addition, the surface property, thermostability and adhesive performance were analyzed.
研究领域:
材料科学
·
化学
✓ 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）