POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1633-1639
·
IF 2.07
Nafeesa Mushtaq,Lala Rukh Sidra,Guofei Chen,Yongmei Tang,Lubo Xu,Xingzhong Fang
A series of cardo based asymmetric polyimides containing bulky rigid naphthalimide and phthalimide groups were prepared from asymmetric monomer bishaloimide and bisphenols by solution polycondensation. Bishalo(naphthalimide-phthalimide) monomers containing different terminal leaving groups (Cl, F, NO 2 ) were synthesized, and the reactivity difference of these monomers was compared for the successful synthesis of polyimides. The inherent viscosities of the polyimides were in the range 0.51 − 0.60 dL g −1 in N -methyl-2-pyrrolidone at 30 °C. These polyimides demonstrated good organosolubility and mechanical properties with tensile strengths of 93 − 120 MPa, tensile moduli of 3.5 − 5.3 GPa and elongations at break of 2.8% − 4.3%. The polyimides showed high glass transition temperatures ( T g ) ranging from 330 to 363 °C. The 10% weight loss ( T 10% ) of asymmetric polyimides reached 436 − 500 °C in nitrogen and 417 − 476 °C in air. The water uptake of the polyimides was in the range 0.35% − 0.72%. © 2017 Society of Chemical Industry
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
DYES AND PIGMENTS
·
2017
·
IF 3.473
Yizhen Zhan,Xue Zhao,Wei Wang
Three azo dyes had been synthesized using N -ethyl substituted, dibromo-substituted and dicyano-substituted phthalimides as diazo components. All of the synthesized intermediates and dyes have been characterized by MS , 1 H NMR, IR and elemental analyses. The dyeing behavior and fastness properties of these dyes have been investigated. Modeling the interaction energy of benzene-benzene, phthalimide-benzene and phthalimide-phthalimide rings, molecule optimization and the interaction energy researching have been done with density functional theory ωB97XD, 6-311G++(d,p) basis set. The results showed that: phthalimide molecule has better coplanarity. Molecule energy of benzene-benzene, phthalimide-benzene and phthalimide-phthalimide rings decreased first and then increased with the increase of the distance between the rings, the lowest energy happened when the distance was about 3.5 Å. Electrostatic force affected the interaction energy most. Substituent groups mainly altered the dispersion force and reduced the energy of the system. The optimization interaction energy of phthalimide-phthalimide, phthalimide-benzene and benzene-benzene was −47.78 kJ/mol, −34.66 kJ/mol and −17.59 kJ/mol. Substituted dibromo group reduced the dipole interaction of the dye.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2011
·Vol. 289
·期 4
·401-407
·
IF 2.443
Dai Runying,Wu Gang,Chen Hongzheng
The performance of electrophoretic displays is strongly dependent on the stability of the electrophoretic suspension in the device. In this manuscript, to obtain the stable electrophoretic suspension, the titanium dioxide grafted with poly [ N -( p -vinyl benzyl) phthalimide] (TiO 2 -g-PVBP) composite particles were prepared via radical polymerization. The obtained TiO 2 -g-PVBP composite particles were fully characterized. The results showed that PVBP was grafted onto TiO 2 surface by chemical bonding. The composite particles with the effective diameter of 300 nm can monodisperse stably in tetrachloroethylene due to the long-chain polymer PVBP, which can provide each TiO 2 particle with steric stabilization. The zeta potential and electrophoretic mobility of the composite particles were 30.3 mV and 4.69 × 10 −6 cm 2 /Vs, respectively, without charge control agent. With the stable electrophoretic suspension containing the prepared composite particles, the matrix electrophoretic display prototype with good performance operated at 9 V was demonstrated.
研究领域:
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Rui Yang,Yuting Wang,Boran Hao,Kan Zhang
Two novel benzoxazine monomers, oHMTI-a and oHMTI-pn, have been obtained via the modified Mannich condensation from ortho-4-methyltetrahydrophalimide functional phenol, paraformaldehyde, and aniline/4-aminophthalonitrile, respectively. The chemical structures of both benzoxazine monomers have been studied by Fourier transform infrared (FT-IR) and 1H and 13C nuclear magnetic resonance (NMR) spectra. Their polymerization processes are investigated using in-situ FT-IR and different scanning calorimetry (DSC). Specifically, the phthalonitrile group in oHMTI-pn can react at a relatively lower temperature without adding any catalysts, which suggests the presence of the thermal synergistic polymerization effect in this benzoxazine monomer. In addition, the thermal and fire related properties of the resulting polybenzoxazines are evaluated by thermogravimetric analysis (TGA) and micro-scale combustion calorimetry (MCC). The polybenzoxazine derived from oHMTI-pn shows both high thermal stability and outstanding flame retardancy, with a T g of 350°C, a T d10 value of 417°C, a high char yield value of 65%, and a very low heat release capacity value of 35.2 J/(g·K).
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Li-Xia Zhao,Mao-Jun Jiang,Jia-Jun Hu,Yue-Li Zou,Yuan Cheng,Tao Ren,Shuang Gao,Ying Fu,Fei Ye
To seek new protoporphyrinogen oxidase (PPO) inhibitors with better biological activity, a series of novel diphenyl ether derivatives containing tetrahydrophthalimide were designed based on the principle of substructure splicing and bioisomerization. PPO inhibition experiments exhibited that 6c is the most potential compound, with the half-maximal inhibitory concentration (IC50) value of 0.00667 mg/L, showing 7 times higher activity than Oxyfluorfen (IC50 = 0.0426 mg/L) against maize PPO and similar herbicidal activities to Oxyfluorfen in weeding experiments in greenhouses and field weeding experiments. In view of the inspected bioactivities, the structure–activity relationship (SAR) of this series of compounds was also discussed. Crop selection experiments demonstrate that compound 6c is safe for soybeans, maize, rice, peanuts, and cotton at a dose of 300 g ai/ha. Accumulation analysis experiments showed that the accumulation of 6c in some crops (soybeans, peanuts, and cotton) was significantly lower than Oxyfluorfen. Current work suggests that compound 6c may be developed as a new herbicide candidate in fields.
研究领域:
植物保护学
·
农药化学
·
分子生物学
✓ 已验证
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2018
·
IF 1.54
Xue Zhao
Three azo dyes were synthesized using N-butyl substituted phthalimides as diazo components. All of the synthesized intermediate derivatives and dyes were characterized by mass spectrometry, proton nuclear magnetic resonance, infrared (IR) and elemental analyses. Synthesized dyes were also evaluated for their dyeing behavior and fastness properties toward polyester fabric. The ultraviolet-visible absorption maxima of the dyes were observed in the range of 445–563 nm. Bromo and cyano substitutions at the 3- and/or 5- positions of the phthalimide ring resulted in hypsochromic and bathochromic shifts, respectively. IR spectra peaks at 1770 and 1395 cm−1 of hydrolyzed dye showed that C–O groups appeared under relatively mild alkaline conditions. The K/S values of dyed polyester/elastane fabrics decreased obviously as the pH value increased. Hydrolysis of the phthalimide ring was found to be largely influenced by steric effects rather than inductive effects. Bromo substituted dyes have the lowest rates of hydrolysis. Compared with S-type dyeing disperse dyes, phthalimide dyes have lower dyeing rates and lower levelness of dye migration. The ωB97XD/6-311G(d,p) calculation found that pi-stacking interactions of phthalimide–benzene and phthalimide–phthalimide dimers increased the dye–fiber and dye–dye interactions.
研究领域:
染料化学
·
纺织科学
·
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Chen Biao,Huang Wenhuan,Zhang Guoqing
Pure organic room-temperature phosphorescence (RTP), particularly from guest-host doped systems, has seen exponential growth in the last several years due to their high modulation flexibility, and yet challenges remain with respect to mechanistic elucidations and advantageous applications. Here we show that by constructing guest-host doped RTP systems from chiral components, namely, chiral amino compound-modified phthalimide hosts and naphthalimide guests, a chiral-selective RTP enhancement phenomenon can be observed. For example, R -enantiomeric guests in R -enantiomeric hosts produce strong red RTP afterglow while no appreciable RTP could be observed in the S-R guest-host counterpart. An unprecedented RTP intensity difference > 10 2 folds with the ability to distinguish an enantiomeric excess of 98% could be achieved. Temperature-dependent measurements suggest that a chirality-dependent energy transfer process may be involved in the observed phenomenon, which can be harnessed to extend the RTP application to the chiral recognition of amino compounds, such as amino alcohols.
研究领域:
材料科学
·
物理化学
·
光学材料
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Donghan Xu,Cuijuan Zhang,Yihan Zhen,Yongdan Li
Symmetric nonaqueous redox flow batteries (NARFBs) that utilize bipolar redox-active organic molecules (BROMs) provide a facile strategy to mitigate the crossover issue. However, their performance has lagged behind due to the low solubility of organic redox species and poor high-current operations. To address these technical hurdles, a series of ionic BROMs based on ferrocene (Fc) and phthalimide (Ph) moieties with fast mass and charge-transfer kinetic are synthesized, which show high solubility and ionic conductivity. Both computational and experimental results show that the extended chain length between phthalimide moiety and quaternary nitrogen atom and the acidity of the solvent play a pivotal part in determining the stability of active materials and thus the cycling stability of NARFB. The assembled symmetric NARFB shows an open-circuit voltage of 2.04 V, cycling capacity retention of 99.8% per cycle, and energy efficiency of 77.0% over 50 cycles at 20 mA cm–2. Furthermore, the battery yields a peak power density of 110 mW cm–2 at 90 mA cm–2, which outperforms most NARFBs. This work demonstrates a promising molecular engineering strategy to improve the cycling stability of BROMs and to enable the high-current operation of symmetric NARFB.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
·
2021
·
IF 3.963
Chao Xu,Hongzhou Chen,Qinyan Wu,Yuqi Wu,Paul Daly,Jian Chen,Hongfu Yang,Lihui Wei,Yiqing Zhuang
Fusarium head blight( FHB )caused by Fusarium graminearum species complex (FGSC) is one of the most important diseases around the world. Deoxynivalenol (DON) is a type of mycotoxin produced by FGSC when infecting cereal crops . It is a serious threat to the health of both humans and livestock. Trehalose-6-phosphate phosphatase ( TPP ), a conserved metabolic enzyme found in many plants and pathogens, catalyzes the formation of trehalose. N-(phenylthio) phthalimide (NPP) has been reported to inhibit the normal growth of nematodes by inhibiting the activity of TPP , but this inhibitor of nematodes has not previously been tested against F. graminearum . In this study, we found that TPP in F. graminearum (Fg TPP ) had similar secondary structures and conserved cysteine (Cys356) to nematodes by means of bioinformatics. At the same time, the sensitivity of F. graminearum strains to NPP was determined. NPP exhibited a better inhibitory effect on conidia germination than mycelial growth . In addition, the effects of NPP on DON biosynthesis and trehalose biosynthesis pathway in PH-1 were also determined. We found that NPP decreased DON production, trehalose content, glucose content and TPP enzyme activity but increased trehalose-6-phosphate content and trehalose-6-phosphate synthase ( TPS ) enzyme activity. Moreover, the expression of TR I 1 , TR I 4 , TR I 5 , TR I 6 , and TPP genes were downregulated, on the contrary, the TPS gene was upregulated. Finally, in order to further determine the control ability of NPP on DON production in the field, we conducted a series of field experiments, and found that NPP could effectively reduce the DON content in wheat grain and had a general control effect on FHB. In conclusion, the research in this study will provide important theoretical basis for controlling FHB caused by F. graminearum and reducing DON production in the field.
研究领域:
植物病理学
·
真菌学
·
农学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 49
·期 14
·5141-5150
·
IF 2.305
Zhuo Longhai,Kou Kaichang,Wang Yiqun,Yao Pan,Wu Guanglei
We report the design and synthesis of a novel pyridine-containing triamine monomer, 2,6-bis(4-aminophenyl)-4-(4-aminophenoxy)pyridine (BAAP), through combining the nucleophilic aromatic substitution with modified Chichibabin reaction and hydrazine hydrate reduction. Based on it, a novel three-step route was applied in order to obtain a series of new polyimides, containing phthalimide as pendent group and pyridine moieties in main chains. The three-step route consisted of terminating the triamine by incorporating phthalic amic acid as pendant, ring-opening polymerization to form poly(amic acid)s and further chemical imidization to acquire polyimides. Nuclear Magnetic Resonance Spectroscopy ( 1 H-NMR) was used for chemical structural characterization, and the results indicated the various forms of BAAP and branched structure units in the obtained polyimides. The morphology structures of the polyimides were evaluated by X-ray diffraction patterns, and the d -spacing values were found in the range of 4.14–4.65 Ǻ. Most of the resulting polyimides were soluble in polar aprotic solvents, such as NMP, DMF, DMAc, DMSO, and so on. Meanwhile, the polyimides exhibited excellent thermal stability, with the decomposition temperature at 5 and 10 % weight loss temperatures in the ranges of 399.1–461.1 °C and 481.1–566.9 °C, respectively. The polyimides, based on 6FDA, possessed the best comprehensive thermally stable and soluble performance.
研究领域:
高分子化学
·
材料科学
✓ 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）