CHINESE CHEMICAL LETTERS
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2014
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IF 1.178
Ming-Hui He,Mei-Lin Su,Zhao-Hui Yu,Guang-Xue Chen,Zhao-Hua Zeng,Jian-Wen Yang
Benzoylformamide (BFA) derivatives are proposed as new photocaged bases with good solubility in epoxy resin. Initially their structures were confirmed by 1 H NMR, 13 C NMR, and elemental analysis. Next, we detail their thermal stability, solubility behavior, and photolysis products. Furthermore, the model photo-latent anion polymerization (AP) of epoxide system in the presence of BFA-dBA ( N , N -dibenzyl-2-oxo-2-phenylacetamide) as a photocaged base has been investigated, and excellent photopolymerization profile is obtained.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2014
·Vol. 52
·期 11
·1560-1569
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IF 3.245
Minghui He,Shun Jiang,Ruixin Xu,Jianwen Yang,Zhaohua Zeng,Guangxue Chen
A detailed evaluation of the kinetics of domino free radical photopolymerization (DFRP) based on phototriggered base proliferation reaction and redox initiation was described in the condition of eliminating the heat of polymerization via reacting in the thin polymer films. First, domino photoinitiating system made a substantial breakthrough in the photoefficiency of amine generation in contrast to photocaged base system, exhibiting marked improvement in the photosensitivity. Second, both the structural feature of base amplifier (BA) and reaction temperature as two important factors impacting the proliferation rate have been detailed. Third, different domino photoinitiating components, such as BAs, peroxides, and acrylates, were investigated in the thin polymer films. It is shown that both primary and secondary BAs are efficient catalysts for DFRP. Furthermore, polymerization rate shows a consistent dependence on the p K a value of the proliferated amine. Finally, remarkable post conversion after irradiation was achieved in DFRP. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 1560–1569
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2013
·Vol. 66
·期 3
·512-517
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IF 1.66
Cui Hongtao,Wang Minmin,Ren Wanzhong,Liu Yan,Zhao Yunan
Silica monoliths embedded with high concentration of γ-Fe 2 O 3 or TiO 2 nanoparticles were prepared by a sol–gel procedure designed according to the inherent properties of oxide colloids. In the first step, highly dispersible oxide nanoparticles were produced using an in situ modification sol–gel strategy. Then, these particles were re-dispersed in silicon alkoxide-containing solution to form a stable colloidal solution. The hydrolysis and condensation reactions of alkoxide were catalyzed by an organic base (morpholine). Due to the large molecule size of morpholine, the electric double layer on the surface of colloidal particles was not compressed by the ionized morpholine molecules. The colloidal solution thus remained stable during the gelation process. Through this procedure, oxide nanoparticles could be immobilized homogeneously in the pores of a silica matrix, forming highly transparent and crack-free monoliths.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2013
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IF 2.206
Yan Liu,Zhenhu Cao,Yan Zhang,Zhengping Fang
Cerium N-morpholinomethylphosphonic acid (MMPA-Ce) with fibrous structure was synthesized via hydrothermal reaction between cerium nitrate hexahydrate and N-morpholinomethylphosphonic acid. The thermal stability and flame retardancy of high density polyethylene (HDPE) containing various amounts of MMPA-Ce was investigated by thermal gravimetric analysis and cone calorimeter. It is found that even at low addition of MMPA-Ce into HDPE could increase the thermal stability of HDPE. The results of cone calorimeter showed that the emission of CO decreased while the emission of CO2 increased instead.
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IONICS
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2015
·Vol. 22
·期 4
·573-579
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IF 1.754
Ma Wenle,Xue Junying,Cui Hongtao
Hexagonal β-Ni(OH) 2 nanosheets with thickness of ∼12 nm were synthesized by a hydrothermal method at 150 °C using nickel chloride as nickel source and morpholine as alkaline. Electrodes for application in pseudocapacitor were assembled through a traditional technique: pressing a mixture of β-Ni(OH) 2 nanosheets and acetylene black onto nickel foam. Due to the hexagonal shape of rigid β-Ni(OH) 2 nanosheet and the mediation of surface-modified glycerol during electrochemical charge–discharge cycles, a nanostructure of electrode material with facile interior pathway for the transfer of electrolyte was formed. As a result, the as-formed electrodes presented high specific capacitance of 1,917 F g −1 at current density of 1.6 A g −1 in 3 mol L −1 KOH solution. At high charge and discharge current density of 31.3 A g −1 , the electrodes still remained a high specific capacitance of 1,289 F g −1 . The interesting results obtained from this investigation may provide a new insight for the synthesis of electrode materials with high electrochemical performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Wenle Ma,Li Wang,Junying Xue,Hongtao Cui
Monolayer nanosheets of Co–Ni layered double hydroxides (LDHs) were synthesized by an ultra-large scale strategy under very moderate condition. The simple grinding of nickel nitrate hexahydrate and cobalt nitrate hexahydrate in morpholine at room temperature produced monolayer nanosheets. At least 40 g monolayer nanosheets can be produced in one batch. The capacity for the production of nanosheets is only limited by the facility used in the laboratory. The formation of monolayered hydroxide is attributed to the complete consumption of water in the water-deficient environment by the hydrolysis reaction between water and morpholine. The water consumption would consequently eliminate the possibility of interlayer hydrogen-bonding, avoiding the stacking of already produced monolayers. Because of the monolayer state of LDHs and the synergistic effect of cobalt ions in LDHs, the nanosheets presented high electrochemical performance.
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MACROMOLECULES
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2015
·
IF 5.8
Zhong Zheng,Yihu Song,Huilong Xu,Qiang Zheng
Immobilized polymer layers surrounding nanoparticles are proposed to be of essentially vital importance for the reinforcement of nanofiller to polymer matrices, but there is still a need to clarify its contribution to diverse rheological performance like colloidal stability and gelation. In this study, we find for the first time that introducing a trace amount of secondary/tertiary amine efficiently thickens the immobilized glassy layer in hydrophilic fumed silica (FS) filled polypropylene glycol (PPG) from 1.5 to 4.5 nm, which simultaneously promotes gelation of the liquid-like dispersion even containing extremely low contents of FS (<2 vol %). By coordinately using modulated differential scanning calorimetry and rheology methods, we find strong evidence that (1) the amine-promoted gelation is due to thickening and easy-percolation of the inner glassy layer converted from an outer uncrystallizable layer, and (2) the dispersion rheology could be well normalized within the framework of a two-phase model incorporating effective volume fraction of nanoparticles plus the glassy layers. We also highlight the importance of the surface chemistry of FS for adjusting the polymer immobilization and dispersion rheology.
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FIRE SAFETY JOURNAL
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2014
·
IF 1.063
Yan Liu,Zhenhu Cao,Yan Zhang,Zhengping Fang
Zinc N -morpholinomethylphosphonic acid (MMPA-Zn) is synthesized by hydrothermal reactions used zinc acetate and N -morpholinomethylphosphonic acid as raw materials. TGA shows that the TG onset temperature of decomposition of MMPA-Zn is 391 °C and the final residue at 700 °C is 65.3 wt%, indicating its good thermal stability and char-forming ability. Then, MMPA-Zn is used as flame retardant in high density polyethylene (HDPE). The thermal property and flame retardancy of various HDPE compositions were investigated by TGA and cone calorimeter (Cone). TG data show that MMPA-Zn can improve the thermal stability and char residue yield, which is dependent on the loading amount of MMPA-Zn. The Cone data indicate that the PHRR and the emission of CO decreased obviously because of the joint effect of Zn and the MMPA in MMPA-Zn molecular, which can yield more char residue in the HDPE/MMPA-Zn system.
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JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Xiuzhen Zhao,Yin Cai,Jishi Chen,Aiping Fu,Fang Ge
Group transfer polymerization (GTP) plays a crucial role in polymerizing (methyl) acrylate. The utilization of cheap and easily synthesized thiourea anion (TUA) combined with pinacolborane (HBpin) undergoes controlled GTPs of methyl methacrylate (MMA), methacrylate (MA), and α-methylenebutyrolactone (MBL) at ambient temperature. The mechanistic study reveals that the TUA′-1 having -NEt 2 moiety works out as a cocatalyst to assist HBpin undergoes the 1,4-hydroboration reaction with α, β-unsaturated acrylates to in situ generate a boron enolate (boryl ketene acetal [BKA]). Different from typical GTP, in which silyl ketene acetal (SKA) is used as an initiator, this work shows that BKA could act as an initiator with the assistance of the cocatalyst TUA′-1 to generate the polymer. The chain end groups of the obtained polymer are characterized by MALDI-TOF-MS, indicating one of the chain ends features a hydride from the HBpin and another chain end has a linear or back-biting cyclic structure. Moreover, the polymerization process is strongly supported by density functional theory (DFT) calculations. The application of BKA expands the research area of GTP reactions. The tunable and structural properties of TUA/hydroboranes significantly broaden the types of initiators in the GTP and pave a new methodology to achieve functional polymers. Graphical
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Zhonggeng Wang,Luzhu Fang,Sensen Ma,Xuejing Zheng,Jianfeng Wang,Yanyu Yang,Wanjie Wang,Yanxia Cao
Nanofibrillated cellulose (NFC) is widely utilized across various fields due to its excellent comprehensive properties. An important area of research focuses on developing high-performance composites by blending NFC with different media, including solvents and polymers. The dispersion of NFC within the medium plays a crucial role in determining the overall performance of these composites. Hansen Solubility Parameters (HSPs) are essential for assessing intermolecular interactions and predicting the dispersion of nanofillers. In this study, microcrystalline cellulose (MCC) was used as the primary raw material to prepare eight types of NFC using the TEMPO oxidation method. The dispersibility of these NFC variants in twenty-nine different solvents was evaluated through turbidity measurements, and MATLAB software was employed to fit and obtain the HSPs for each type of NFC. Further research revealed a significant inverse relationship between NFC diameter, which serves as an indicator of its size, and the dispersion parameter (δ D ) value. Additionally, as the -COOH content increased, the hydrogen bonding parameter (δ H ) value also increased. In contrast, no significant correlation was observed between the polar parameter (δ P ) value and the morphological structure of NFC. This research aims to expand the HSP database for nanomaterials, providing valuable guidance for selecting the most suitable medium for optimal NFC dispersion.
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PubMed
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Journal of the American Chemical Society
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2025
·
IF 15.6
Chenyang Nie,Yuanhao Li,Xiaona Liu,Nana Yan,Chao Ma,Jiahui Zhu,Linlin Hao,Peng Guo,Zhongmin Liu
Small-pore aluminophosphate (AlPO) molecular sieves (MSs), particularly those in the ABC-6 family, have gained significant attention for their unique capabilities in selective adsorption and energy storage. However, developing new synthesis strategies for designing AlPOs with three-dimensional (3D) channel systems and determining the structures of nanosized novel AlPO MSs remain challenging tasks. In this study, we introduce a new small-pore AlPO with a 3D channel system, named DNL-17, synthesized by using a diquaternary ammonium compound as an organic structure-directing agent (OSDA). Its crystallographic structure was determined through advanced 3D electron diffraction (ED) techniques and further confirmed by emerging integrated differential phase contrast imaging. DNL-17 exhibits a remarkable 24-layer stacking sequence along the c-axis and features a variety of composite building units (CBUs), including d6r, can, cha, and eri. Significantly, a combination of 3D ED, theoretical calculations, and solid-state 13C NMR reveals that the employed OSDA adopts distinct conformations to stabilize different cages. This finding highlights a novel strategy for constructing AlPO MSs with diverse cage-based CBUs. Furthermore, DNL-17 demonstrates unique selective adsorption properties, particularly in the separation of n-butane and isobutane.
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Journal of Physical Chemistry C
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2011
·
IF 4.524
Min Xie,Guichi Zhu,Yongjun Hu,Huaimin Gu
Morpholine is a typical six-membered saturated heterocycle with the molecular formula HN(CH2CH2)2O. In this work, the conformations of Morpholine in liquid and adsorbed on the surface of gold nanoparticles were studied by means of Raman spectroscopy and theoretical calculations. Ab initio calculations indicate that the energy of the chair conformers of Morpholine is ca. 7.5 kcal/mol lower than the skew-boat conformers, which implies that the chair conformers would be favorable in liquid Morpholine. Comparison of the observed Raman spectra of liquid Morpholine, its solution, and the predicted spectra of the chair conformers (equatorial and axial) revealed that both of the chair conformers coexist in its liquid, and the content of the equatorial-chair conformer may reduce in the solution. Considering the concentration-dependent Surface-Enhanced Raman Scattering (SERS) spectral profile, the surface selection rule, and the theoretical calculations, it has been inferred that at higher concentrations Morpholine is vertically chemisorbed on gold nanoparticles through the N atom of the ring, and the dominant conformation adsorbed is the axial-chair conformer. However, at the dilute concentrations, Morpholine is gradually flatly chemisorbed on the gold nanoparticles through the N atom, and the Morpholine may be deprotonated. Furthermore, the predicted spectra agree with the experimental ones very well, which confirms the results above.
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