MACROMOLECULES
·
2013
·
IF 5.521
Chengmin Hou,Jiwen Hu,Guojun Liu,Jiandong Wang,Feng Liu,Heng Hu,Ganwei Zhang,Hailiang Zou,Yuanyuan Tu,Bing Liao
Six binary graft copolymers were synthesized, and their graft segregation in bulk was investigated. The copolymers were prepared by a one-pot method involving the quantitative grafting of alkyne-end-functionalized poly(n-butyl acrylate) (PBA-C≡CH) and poly(2-cinnamoyloxyethyl methacrylate) (PCEMA-C≡CH) onto poly(3-azide-2-hydroxypropyl methacrylate) (P(GMA-N3)) via click chemistry. Of these copolymers, three had a total PBA and PCEMA molar grafting density g of ∼20%, and their PBA volume fractions VB among PBA and PCEMA varied between 28% and 57%. VB was constant at ∼57%, while g varied between 9.8% and 29.5% for the other three samples. Bulk films were obtained by slowly evaporating the solvent from cast solutions of these copolymers. These films were then annealed above the glass transition temperatures of PBA and PCEMA to facilitate graft segregation. The graft segregation patterns were examined by performing transmission electron microscopy (TEM) analysis of thin sections of these films. The TEM results suggested that the grafted PBA chains formed a disordered wormlike phase in a PCEMA matrix at VB = 28%. At VB = 42% and 57%, PBA and PCEMA seemed to form alternating lamellae. In the former case, the PBA layers were thinner than the PCEMA layers, while the PBA layers were thinner in the latter case. All three samples with VB ∼ 57% probably possessed a lamellar morphology. The periodicity of the lamellae increased and the long-range ordering deteriorated as g increased.
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ChemSusChem
·
2015
·Vol. 8
·期 10
·1761-1767
·
IF 7.657
Yi Shao,Qineng Xia,Xiaohui Liu,Guanzhong Lu,Yanqin Wang
Graphical Mild mannered: Under mild conditions (170 °C, 2.5 MPa), Pd/10 %Nb 2 O 5 /SiO 2 is effective for the hydrodeoxygenation reactions of 4-(2-furyl)-3-buten-2-one (the aldol adduct of furfural with acetone), palmitic acid, tristearin, and diphenyl ether (model compounds of vegetable oils, microalgae oils, and lignin) and gives high yields (>94 %) of alkanes with little C C bond cleavage. A simple Pd-loaded Nb 2 O 5 /SiO 2 catalyst was prepared for the hydrodeoxygenation of biomass-related compounds to alkanes under mild conditions. Niobium oxide dispersed in silica (Nb 2 O 5 /SiO 2 ) as the support was prepared by the sol–gel method and characterized by various techniques, including N 2 adsorption, XRD, NH 3 temperature-programmed desorption (TPD), TEM, and energy-dispersive X-ray spectroscopy (EDAX) atomic mapping. The characterization results showed that the niobium oxide species were amorphous and well dispersed in silica. Compared to commercial Nb 2 O 5 , Nb 2 O 5 /SiO 2 has significantly more active niobium oxide species exposed on the surface. Under mild conditions (170 °C, 2.5 MPa), Pd/10 %Nb 2 O 5 /SiO 2 was effective for the hydrodeoxygenation reactions of 4-(2-furyl)-3-buten-2-one (aldol adduct of furfural with acetone), palmitic acid, tristearin, and diphenyl ether (model compounds of microalgae oils, vegetable oils, and lignin), which gave high yields (>94 %) of alkanes with little C C bond cleavage. More importantly, owing to the significant promotion effect of NbO x species on C O bond cleavage and the mild reaction conditions, the C C cleavage was considerably restrained, and the catalyst showed an excellent activity and stability for the hydrodeoxygenation of palmitic acid with almost no decrease in hexadecane yield (94–95 %) in a 150 h time-on-stream test.
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NANOTECHNOLOGY
·
2015
·Vol. 26
·期 11
·115102
·
IF 3.821
Ming Wu,Da Zhang,Yongyi Zeng,Lingjie Wu,Xiaolong Liu,Jingfeng Liu
In this paper, a core–shell nanocomposite of clusters of superparamagnetic iron oxide nanoparticles coated with poly(dopamine) (SPION clusters@PDA) is fabricated as a magnetic field-directed theranostic agent that combines the capabilities of highly sensitive magnetic resonance imaging (MRI) and photothermal cancer therapy. The highly concentrated SPION cluster core is suitable for sensitive MRI due to its superparamagnetic properties, and the poly(dopamine) coating layer can induce cancer cell death under near-infrared (NIR) laser irradiation because of the photothermal conversion ability of PDA. MRI scanning reveals that the nanocomposite has relatively high r2 and r2* relaxivities, and the r2* values are nearly threefold higher than the r2 values because of the clustering of the SPIONs in the nanocomposite core. Due to the rapid response to magnetic field gradients, enhanced cellular uptake of our nanocomposite mediated by an external magnetic field can be achieved, thus producing significantly enhanced local photothermal killing efficiency against cancer cells under NIR irritation.
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POLYMER
·
2015
·
IF 3.562
Wan-Xia Wu,Lin Qu,Bei-Yu Liu,Wei-Wei Zhang,Na Wang,Xiao-Qi Yu
A novel linear polyester with acid-labile β -thiopropionate groups was synthesized via the direct lipase-catalyzed polycondensation of methyl 3-((2-hydroxyethyl)thio)propanoate (MHETP) using immobilized lipase B from Candida antarctica (CALB). The influences of reaction conditions such as polymerization temperature and time on the molecular weight of the poly( β -thioether ester) (PTE) were studied. Ring-opening and condensation copolymerization of MHETP with ε -caprolactone (CL) led to the synthesis of novel poly( β -thioether ester- co - ε -caprolactone) copolymers , poly(TE- co -CL), with well-defined composition and narrow polydispersity . The random copolymers were characterized by 1 H NMR, 13 C NMR, 2D NMR , GPC , TGA and DSC . The degradation of the poly( β -thioether ester) under acidic conditions was investigated by GPC and 1 H NMR spectroscopy.
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POLYMER TESTING
·
2015
·
IF 2.24
Xinchao Bian,Lidong Feng,Gao Li,Zhiming Chen,Xuesi Chen
An analytical method has been developed to quantitatively determine the residual lactide monomer in polylactide (PLA) using an internal standard method of gas chromatography (GC). The experimental results showed that diphenyl ether (DPE) was an appropriate internal standard for quantitative analysis of residual lactide in PLA. PLA and DPE were dissolved in dichloromethane and precipitated in hexane . At the same time, the residual lactide in PLA and DPE as an internal standard were extracted to hexane from the polymer solution . The resulting solution could be directly injected into a GC system. Therefore, the residual lactide was determined quantitatively using an internal standard method of GC. This method is practical for measuring the residual lactide content in PLA. When the lactide content is 5.0%, the relative standard deviation ( RSD ) of the measurements is 1.7%, while RSD is 6.9% at the low level of 0.4%, which indicates that the method is sufficiently precise.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 32
·7737-7747
·
IF 5.317
Lei Miao,Yuanyuan Tu,Yang Yang,Shudong Lin,Jiwen Hu,Min Zhang,Yue Li,Fei Li,Yangmiao Mo
Graphical Doubly responsive : A thermo- and pH-sensitive binary graft copolymer bearing anchoring side chains was synthesized and blended with commercial polysulfone to prepare thermo- and pH-responsive blended membranes, which exhibited robust, reversible, independent temperature- and pH-responsive water wettability and water permeability (see figure). A stimuli-responsive membrane exhibiting independent pH- and temperature-responsive behavior was fabricated from a blend of commercial polysulfone with a functional amphiphilic binary graft copolymer, namely, polysulfone- graft -(poly(isopropylacrylamide- co -acrylic acid)- random -poly(methyl acrylate)), denoted PSf- g -(P(NIPAAm- co -AA)- r -PMMA). Two graft copolymers with different lengths of P(NIPAAm- co -AA) side chains were designed and enriched on the membrane surface to serve as thermo- and pH-responsive on/off switches. The differences between the dual-responsive behaviors of the two kinds of polymer-blend membranes were studied by water-flux and contact-angle measurements. The PMMA side chains served to securely anchor the graft copolymers to the membrane substrate, and the blended membrane prepared from binary graft copolymer was more stable and exhibited more robust stimuli-responsive behavior than that prepared from mono-graft copolymer PSf- g -P(NIPAAm- co -AA).
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FUEL
·
2025
·
IF 7.5
Caitao Chen,Juan Ma,Yakun Tang,Xiaohui Li,Guangbo Liu,Hanyao Song,Yingluo He,Noritatsu Tsubaki,Lang Liu,Ting Liu
Cleaving the aromatic ether C-O bonds of lignite through catalytic hydroconversion (CHC) presents a significant challenge for producing organic chemicals and clean liquid fuels, which are vital for a sustainable future. In this study, we employed a sacrificial template-self-recovery strategy to synthesize highly dispersed and carbon-coated bimetallic catalysts MCo/C (M = Fe, Cu, Ni) for the CHC of Naomaohu coal (NMHC) and lignite-related model compounds (LRMCs). The carbon-coated NiCo bimetallic alloy catalysts, benefiting from the high dispersity of the active components and the synergistic effect between Ni and Co, exhibited excellent hydrogenolysis activity towards diphenyl ether (DPE). DPE conversion reached 100 % over Ni 3 Co 1 /C under optimal conditions (120 °C, 2 MPa H 2 , 2 h). Moreover, Ni 3 Co 1 /C significantly increased the content of arenes and alkanes while reducing the content of oxygen-containing compounds in the NMHC soluble portion (SP), demonstrating its efficient catalytic hydrogenolysis and hydrodeoxygenation capabilities. Density Functional Theory (DFT) calculations revealed that the Ni 3 Co 1 /C catalyst could activate H 2 to generate hydrogen radicals and diatomic active hydrogen, which are the primary hydrogen species involved in the reaction and affect the CHC of DPE. The experimental results can provide a reference for the conversion of lignite into clean liquid fuels.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Cijun Shuai,Chong Lin,Chongxian He,Wei Tan,Shuping Peng,Wenjing Yang
Bone implant-associated bacterial infection is a common cause of transplant failure. Chemodynamic therapy (CDT) has significant antibacterial efficacy by producing reactive oxygen species (ROS). However, the ROS permeability is restricted by the natural barrier of bacterial biofilms. Herein, a hard-soft magnetic biphasic nanoparticle (CF@MF) was synthesized by in-situ growth of the soft MnFe 2 O 4 shell on the hard CoFe 2 O 4 core. Then, the CF@MF was incorporated into poly- l -lactide powders to prepare porous scaffolds by selective laser sintering. The scaffold exhibited superior magnetothermal conversion efficiency, which was attributed to the interfacial exchange coupling of CF@MF. Importantly, the scaffold effectively dispersed biofilms by magnetothermal therapy (MTT), favoring numerous ROS pre-generated by CDT to enter the interior to kill bacteria. This study provided a synergistic MTT/CDT strategy to eradicate deep bacterial infections in biomedical application.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Wei Chen,Xinxin Liao,Feng Chen,Xiang Xia,Ping Tong,Yanqiao Jin,Lei Xiong
Considering the facts of fossil fuel depletion and environmental issues, the conversion of biomass into high value-added chemicals is of great importance. In this work, Ni and Co were encapsulated in lignin-derived phenolic resin spheres to obtain NiCo@LRS, which was then employed as a sacrificial template for the synthesis of the bimetallic catalyst NiCo@LC-RS. The Ni and Co act as the acid and dehydrogenation sites for the catalytic transfer hydrogenolysis of 2-phenoxy-1-phenylethanol ( pp-ol ) and corncob lignin, respectively, and exhibit a synergistic enhancement effect. Under the optimal conditions of 170 °C, 1 MPa N 2 and 4 h, the conversion of pp-ol reached 99.9 %, with the yields of cyclohexanol and ethylbenzene at 99.9 % and 93.8 %, respectively. The lignin was completely converted and the selectivity of monophenols was 55.74 %. The catalyst remained stable and reusable after 5 cycles. Furthermore, lignin oil can be employed in the preparation of Ni Co bimetallic catalysts, which have been demonstrated to exhibit excellent catalytic properties. This work provides practical guidance for the high-value utilisation of lignin.
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Polymers
·
2024
·Vol. 16
·期 18
·2635
·
IF 4.7
Yan Li,Chong Tian,Guiqing Cheng,Chunhui Li,Zhongwei Wang
A phosphorus-containing compound, (oxybis(4,1-phenylene))bis(phenylphosphine oxide) (ODDPO), was successfully synthesized and used as a flame retardant for epoxy resin (EP). The results demonstrated that EP/ODDPO, containing 1.2 wt% phosphorus, achieved a vertical burning V-0 rating, with a limited oxygen index value of 29.2%, indicating excellent flame retardancy. Comprehensive evaluations revealed that ODDPO exhibited both gas-phase and condensed-phase flame-retardant effects on EP, with a particularly notable barrier effect. In addition, the incorporation of ODDPO had a minimal negative impact on the glass transition temperature (Tg) and thermal stability of the EP matrix. Compared to unmodified EP (EP-0), theTgvalue and initial decomposition temperature of EP/ODDPO-1.2 decreased by only 7.6 °C and 10.0 °C, respectively. Moreover, the introduction of ODDPO significantly improved the hydrophobicity and water absorption resistance of epoxy materials, which is attributed to ODDPO’s rigidity and symmetric structure, reducing water molecule permeation. Furthermore, the dielectric properties of ODDPO-modified EP samples were strengthened compared to EP-0, due to the ODDPO’s symmetric structure reducing the polarity of the matrix. The above results indicated that ODDPO serves as an excellent flame retardant while enhancing other properties of the EP matrix, thereby contributing to the preparation and application of high-performance epoxy materials.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 4
·e56399
·
IF 2.7
Wenmin Mu,Chong Tian,Shijie Zhang,Tao Zhuang,Qing Yu,Liang Song,Guiqing Cheng,Zhongwei Wang,Yuxi Han
A fresh phosphorus-containing fireproofing agent (oxybis(4,1-phenylene))bis((2,5-dihydroxyphenyl)(phenyl)phosphine oxide) (ODDPO-HQ) was synthesized by a simple two-step reaction. The effect of ODDPO-HQ on the glass transition temperature ( T g ), crosslinking density, thermal stability, fire resistance, dielectric performances, hydrophobicity, and water absorption of epoxy resin (EP) was studied. EP/ODDPO-HQ containing 1.2 wt% phosphorus not only achieved the vertical burning V-0 grade with a limited oxygen index of 28.9% but also maintained good thermal stability. Compared to unmodified EP, its T g value has only decreased by 7.2°C. Detailed studies revealed that the excellent flame resistance of ODDPO-HQ for epoxies was ascribed to the flame suppression both in the gaseous phase and condensed phase, especially the obvious barrier effect. Although the water uptake of the modified epoxies slightly rose with the content of ODDPO-HQ caused by the reduction of the crosslinking density within the matrix, it did not adversely affect the properties of the polymer. The modified epoxies showed reduced dielectric constant and dielectric loss values, and the contact angle of EP/ODDPO-HQ samples increased as the flame retardant content rose, which might be due to the symmetrical structure of ODDPO-HQ reducing the polarity. Our study presents an easy approach for producing high-performance epoxies.
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CRYSTENGCOMM
·
2024
·
IF 2.6
Guixin Zhao,Sixuan Zhang,Jinzhao Huang,Zehui Liu,Feng Jiao,Ke Zhang,Yu Zhang,Xiaolong Deng
NiMo-based polyalloy catalyst is a non-precious metal-based high-entropy alloy catalyst that has been extensively studied in recent years. It exhibits superior electrochemical performance in electrocatalytic water splitting for hydrogen production, and the combination of NiMo-based polyalloy catalysts with carbon black substrates is expected to produce better electrochemical supports. In this paper, we prepared a series of carbon-based high-entropy heterogeneous material catalysts using zero-dimensional carbon black, one-dimensional carbon nanotubes and two-dimensional graphene as substrates, respectively. Analytical results through structural characterization of the synthesized materials as well as electrochemical tests revealed that carbon black, which is in the form of nanoparticles, can be more tightly wrapped with Ni shells compared to tubular nanotubes and flake graphene, which can effectively increase the number of active sites, thus promoting the outstanding performance of the zero-dimensional carbon-based transition metal nanomaterial catalysts NiMoCoMnLa/CB@Ni in alkaline electrocatalytic hydrogen precipitation reaction . Driven by these findings, this work may provide new ideas in the pathway of rationally designing zero-dimensional carbon-based high-entropy alloy nanoparticle catalysts as efficient electrocatalysts in green hydrogen production processes.
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