POLYMER BULLETIN
·
2023
·Vol. 81
·期 1
·969-993
·
IF 3.2
Li Chen,Zhen Weijun
Modified attapulgite (ATP-PS) grafted with polystyrene (PS) was prepared based on Pickering emulsion polymerization. The characterization of ATP-PS was studied by transmission electronic microscopy (TEM), X-ray photoelectron spectrometer (XPS), Fourier transform infrared spectrometer (FTIR) and contact angle analysis. TEM analysis showed that the surface of ATP-PS was coated with PS organic layer; XPS analysis showed that the proportion of C element in ATP-PS was much larger than that of ATP; FTIR analysis found that ATP-PS had more PS specific functional group peaks than that of ATP; Moreover, contact angle results showed that the hydrophobicity of ATP-PS was significantly improved compared with ATP. The above characterization analysis proved that the modification of ATP-PS was successful. Moreover, polyphenylene sulfide (PPS) hydrophobic porous membrane was prepared with 1-chloronaphthalene and dibutyl phthalate as mixed diluents and ATP-PS as additives. The results showed that 0.8 wt% of ATP-PS had a great effect on the structure and performance of the membrane. With the increasing of the mass proportion of ATP-PS in the preparation of PPS base membrane, the microstructure of PPS based membrane was changed from blocky bicontinuous to spherical granular bicontinuous. When the addition amount of ATP-PS was 0.8 wt% of the total mass of PPS base membrane, PPS based membrane had strong hydrophobicity and organic solvent affinity, and its n -butanol flux could reach 106.9642 L m −2 h −1 bar −1 . The rheological properties of PPS based membrane showed that ATP-PS was well compatible with the PPS, and ATP-PS was beneficial to crosslink between PPS molecular chains, thereby increasing the mechanical properties of PPS based membrane. Phase transition analysis demonstrated that ATP-PS (0.8 wt%) increased the melting temperature (2.34 °C) and crystallization temperature (2.63 °C) of PPS based membrane compared to PPS, thus allowing PPS to complete the phase transition at higher temperature interval during film formation, resulting in a stable microscopic cluster structure. Based on hydrophobic porous PPS membrane, PPS/ATP-PS/TA nanocomposites membrane with ATP-PS selective layer was prepared by co-deposition of tannic acid (TA) and ATP-PS on the surface of PPS membrane. The performance of PPS/ATP-PS/TA nanocomposites membrane was studied, which showed that the n -butanol flux of PPS/ATP-PS/TA nanocomposites membrane was 61.2913 L m −2 h −1 bar −1 . More importantly, the simulated filtration performance of MB dye organic waste liquid (the solvent is n -butanol) showed that the maximum rejection rate of MB dye reached 99.82%. These results demonstrate that PPS/ATP-PS/TA nanocomposites membrane will have potential application in the filtration of organic dye wastewater.
研究领域:
材料科学
·
高分子科学
·
化学工程
·
膜技术
·
环境科学
·
表面改性
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 10
·1706404
·
IF 13.325
Guangjun Zhang,Xiaopeng Xu,Zhaozhao Bi,Wei Ma,Dongsheng Tang,Ying Li,Qiang Peng
In this work, four donor (D)–acceptor (A) copolymers based on benzodithiophene (BDT) and benzothiadiazole (BT) with different alkylthiolated and/or fluorinated side chains are developed for efficient fullerene and nonfullerene polymer solar cells (PSCs). The synergistic effect of sulfuration and fluorination on the optical absorption, energy level, crystallinity, carrier mobility, blend morphology, and photovoltaic performance is investigated systematically. By incorporating sulfur atoms onto the side chains, a little blueshifted but significantly increased absorption can be obtained for PBDTS-FBT compared to PBDT-FBT . On the other side, a little more blueshifted but much stronger absorption and much lower-lying highest occupied molecular orbital (HOMO) level can be realized for PBDTF-FBT when introducing fluorine atoms instead of sulfur atoms. With the combination of both fluorination and sulfuration strategies, PBDTS-FBT exhibits the best absorption ability, lowest HOMO energy level, and highest crystallinity, which make PBDTSF-FBT devices show the highest power conversion efficiency (PCE) of 10.69% in fullerene PSCs and 11.66% in nonfullerene PSCs. The PCE of 11.66% is the best value for PSCs based on BT-containing copolymer donors reported so far. The results indicate that fluorination and sulfuration have a synergistically positive effect on the performance of D–A photovoltaic copolymers and their solar cell devices.
研究领域:
材料科学
·
高分子化学
·
有机电子学
·
光伏技术
✓ 已验证
DOI
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 47
·10696-10702
·
IF 3.679
Longfei Luo,Chengcheng Liang,Hong Zhang,Yiwu Zong,Kun Zhao
Anisotropic colloidal particles with concave and convex structures are useful in both theoretical studies and applications. In this work, we mass-produced polystyrene (PS) colloidal particles with multiple concavities through dispersion polymerization techniques. By increasing the delayed feeding time td of the cross-linker divinylbenzene (DVB), the morphological evolution of particles can be classified into two stages, during which the formation of different concavities is consistent with either the buckling mechanism or phase separation mechanism. By varying the DVB dosage, we found that the size of the big chamber formed on the particle surfaces decreases as the DVB dosage increases. Then, using these concave particles as seeds, 2–5 μm anisotropic colloids with various shapes, including spherical, ellipsoidal, snowman and multi-protrusion, were synthesized by seeded emulsion polymerization. Moreover, our results show that both the chambers and long narrow ditches on the surface of seeds can be the active sites for monomers to gather and polymerize, but monomers in the big chamber have a priority to polymerize first when big and small concavities both exist on seeds. The results of this study could mean great potential in synthesizing a variety of anisotropic particles with well-controlled concave morphologies.
研究领域:
材料科学
·
化学工程
·
胶体化学
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Jianing Zhou,Jinxian Yang,Muhammad Waqas Ishaq,Lianwei Li
Exploring the difference in the topology–structure–conformation relationship for linear and cyclic graft polymers is an interesting topic. In this work, two libraries of linear graft (l-PPA-g-PS, with a linear backbone) and cyclic graft (c-PPA-g-PS, with a cyclic backbone) polystyrenes with low ratios of the backbone-to-sidechain contour length (rc, from 1.26 to 6.22) and various grafting densities (σ, from 0.16 to 0.86) have been studied as models. Atomic force microscopy (AFM) characterization has indicated ellipsoidal and spherical morphologies for both l-PPA-g-PS and c-PPA-g-PS with no significant difference. By comparing the absolute (Mw,abs) and apparent (Mw,app) molar masses, it is found that Mw,abs/Mw,app varies from 1.5 to 3.5 and gradually increases with σ. By measuring gh1/2 (gh1/2 = Rh,graft/Rh,linear), it is found that the two topologies have different compactness of conformation. By following the temperature-dependent interchain aggregation in cyclohexane, it is found that the cyclic backbone feature can suppress the interchain association and be more susceptible to graft density than linear graft polymers. The present study has clearly showed that the cyclic graft topology can potentially display unique structural and conformational properties, which can be attributed to the topological advantages such as more compact conformation and significant isotropic features.
研究领域:
聚合物科学
·
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
CURRENT MEDICINAL CHEMISTRY
·
2024
·
IF 3.5
Gan Xin,Xie Jingwen,Dong Zhaojun,Wu Yuna,Zeng Xiaoqing,Yang Zhenzhen,Liu Bo,Zhu Min,Wang Bozhen,Li Wulan,Wang Ledan,Zhang Huajie,Wu Jianzhang,Hu Yue
Background: Pyroptosis, a cell death process triggered by chemotherapy drugs, has
emerged as a highly promising mechanism for combating tumors in recent years. As the lead of
new drugs, natural products play an important role in the discovery of anticancer drugs. Compared
to other natural products, the medicine food homologous natural products (MFHNP) exhibit a superior
safety profile. Among a series of MFHNP molecular skeletons, this study found that only
benzylideneacetophenone (1) could induce cancer cell pyroptosis. However, the anti-cancer activity
of 1 remains to be improved.
Aims: This study aimed to find a pyroptosis inducer with highly effective antitumor activity by
modifying the chalcone structure.
Methods: To examine the effect of the Michael receptor in compound 1 on the induction of pyroptosis,
several analogs were synthesized by modifying the Michael acceptor. Subsequently, the anticancer
activity was tested by MTT assay, and morphological indications of pyroptosis were observed
in human lung carcinoma NCI-H460 and human ovarian cancer CP-70 cell lines. Furthermore,
to improve the activity of the chalcone skeleton, the anticancer group 3,4,5-
trimethoxyphenyl was incorporated into the phenyl ring. Subsequently, compounds 2-22 were designed,
synthesized, and screened in human lung cancer cells (NCI-H460, H1975, and A549). Additionally,
a quantitative structure-activity relationship (QSAR) model was established using the
eXtreme Gradient Boosting (XGBoost) machine learning library to identify the pharmacophore.
Furthermore, both in vitro and in vivo experiments were conducted to investigate the molecular
mechanisms of pyroptosis induced by the active compound.
Results: α, β-unsaturated ketone was the functional group of the chalcone skeleton and played a
pivotal role in inducing cancer cell pyroptosis. QSAR models showed that the regression coefficients
(R2) were 0.992 (A549 cells), 0.990 (NCI-H460 cells), and 0.998 (H1975 cells). Among these
compounds, compound 7 was selected to be the active compound. Moreover, compound 7 was
found to induce pyroptosis in lung cancer cells by upregulating the expression of CHOP by increasing
the ROS level. Furthermore, it effectively suppressed the growth of lung cancer xenograft
tumors.
Conclusion: Compound 7 exhibits antineoplastic activity by regulating the ROS/ER stress/pyroptosis
axis and is a kind of promising pyroptosis inducer.
研究领域:
肿瘤学
·
药理学
·
药物化学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Dan Ren,Shu-Ping Ren,Yakai Lin,Jianhong Xu,Xiao-Lin Wang
Many industries produce large amounts of glycerol-based wastewater, which always contains hazardous organic chlorides. Compared with complicated biological treatments or physical adsorption, membrane separation decreases the cost and saves energy. Strong swelling of traditional thin-film composite (TFC) membranes influence the performance in the separation of organic molecules. Here we prepared TFC membranes with an acrylamide-grafted PAN support layer to copolymerize with m-phenylenediamine (MPD) and trimesoyl chloride (TMC). The link of separative layer and support layer was created like a zipper stitching to enhance the stability and resistance for the removal of organic molecules. An aquatic grass-like layer of acrylamide enlarges the surface area and hydrophilicity with superior separation performances (15.8 LMH bar −1 flux, 72.0% rejection of dichloropropanol (DCP) and 64.6% rejection of glycerol (Gl)). The trade-off upper bound was improved to a high level. We also established the simulations of evaporation using Aspen Plus and mathematical models of reverse osmosis to calculate the energy consumption corresponding to the recycle of glycerol-based wastewater. The experimental and theoretical results illustrate the advantages of acrylamide-grafted TFC membranes in the ap-plications to concentrate organic solutes and treat wastewater.
研究领域:
膜科学
·
环境工程
·
化学工程
·
废水处理
✓ 已验证
DOI
高影响因子
Environmental Progress & Sustainable Energy
·
2020
·Vol. 39
·期 5
·e13404
·
IF 1.989
Jian Zhai,Chunhua Jiang,Chao Long
In this study, a two-step method was applied to build and start up a fungal–bacterial biofilter. The reactor was built by controlling pH and adding an antibiotic based on a conventional biofilter. A low pH (5.9) and the addition of chloramphenicol were favorable for the construction of the fungal–bacterial biofilter. The results illustrated that it took only 15 days to complete the start-up of the fungal–bacterial biofilter. The removal efficiency (RE) and the mineralization rate (MR) were 93.0% and 77.6%, respectively, at a toluene concentration of 1,000 ± 112 mg m −3 and an empty bed residence time (EBRT) of 45 s. The new method effectively overcomes the unstable performance and nonuniversality of such a reactor, which was constructed by inoculating a pure fungal culture into a bacterial biofilter. Removal performance comparison and PICRUSt analysis showed that the higher the relative abundance of benzoate degradation-related genes in activated sludge is, the more suitable the sludge is for inoculation. The increase in toluene MR and the apparent morphology and scanning electron microscopy (SEM) results of biofilms in the top layer of the fungal–bacterial biofilter suggest that the biofilter performance enhancement can be attributed to the ability of fungi to distribute toluene-degrading bacteria.
研究领域:
环境工程
·
微生物学
·
生物技术
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Haochuan Luo
An effective method to prepare crosslinked polybenzimidazole (PBI) via [2 + 3] Huisgen cycloadditions has been proposed. Propargyl modified PBI (PBI-PG) has been synthesized firstly. In the presence of diazido crosslinkers, PBI-PG can be thermally crosslinked by [2 + 3] Huisgen cycloadditions. Evidences from 1 H NMR and ATR spectra imply a small amount of grafting alkenyl structures on PBI-PG. The grafting alkenyl structures provide another crosslinking mechanism named as alkyne-alkene crosslink. The alkyne-alkene crosslink is highly efficient under heat to form crosslinking networks which display toughness, low tensile strengths, and large swelling ratios in phosphoric acid (PA) solutions. Influences of rigidities and chain lengths of crosslinkers on performances of crosslinked PBIs have been investigated. PBIs crosslinked by rigid crosslinkers behave as brittle materials while that crosslinked by flexible crosslinkers behave as tough materials. Addition of crosslinkers leads to decreased gel fractions but improved tensile strengths, which is attributed to competition results of crosslinking and plasticizing effects. PBI-R2-20, which is crosslinked by a long rigid crosslinker, exhibits the highest tensile strength of 102.33 MPa, which is 66.34 MPa higher than that of PBI-PG. With even lower PA uptakes, PBIs crosslinked by rigid crosslinkers display more thermally stable and higher conductivities than that crosslinked by flexible crosslinkers. After doping in 12 mol/L PA solution, PBI-R2-20, with an acid uptake of 163 wt%, displays the highest tensile strength of 8.1 MPa and the most thermally stable and the highest conductivity which reaches a maximum of 2.30 × 10 −2 S cm −1 at 188 °C among all crosslinked membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Molbank
·
2022
·Vol. 2022
·期 2
·M1373
·
IF 0
Jialuo Chen,Lili Duan,Kunming Liu,Jin-Biao Liu
This short note elaborates a concise protocol for the synthesis of two novel vicinal haloethers bearing a malonontrile group, 2-bromo-2-(methoxy(phenyl)methyl)malononitrile (1) and 2-iodo-2-(methoxy(phenyl)methyl)malononitrile (2). The structures of the synthesized compounds were confirmed by 1H, 13C-NMR spectroscopy. The final products indicate that methanol not only acts as solvent but also participates in and dominates the reaction result.Keywords:β;β-dicyanostyrene;difunctionalization;vicinal haloether
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Guodian Zhu,Xueqing Qiu,Ying Zhao,Yong Qian,Yuxia Pang,Xinping Ouyang
A new two-step lignin depolymerization strategy was developed, in which the benzylic alcohols in lignin was methylated under microwave irradiation, followed by a hydrogenolysis for the cleavage of β O 4 bond with Pd/C as the catalyst. The results showed that an efficient and selective catalytic methylation of benzylic alcohols was achieved with various lignin model compounds, and the acidic environment promoted the methylation of benzylic alcohol. Methylation of benzylic alcohol increased the β O 4 bond cleavage rate by 55.9%, and improved products selectivity . Preliminary study of lignin depolymerization illustrated that methylation pretreatment of benzylic alcohols facilitated lignin depolymerization to produce aromatic monomers and reduced the oxygen content of aromatic monomers.
研究领域:
生物化学
·
可再生资源与环境科学
✓ 已验证
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Lu Mao,Jiaojun Shen,Xiaoliang Ma,Zhonghui Lan,Xu Zhang
Photocatalytic degradation of 2,4-dinitrophenol in two commercial TiO2 (Degussa P25 and Hombikat UV-100) was investigated in this work. The properties of two TiO2 were systematically studied and described in detail. The observed photoactivity of Degussa P25 was 6–12 times higher than Hombikat UV-100 although the specific surface area of Hombikat UV-100 was 5.7 times more than that of Degussa P25. The photodegradation of 2,4-dinitrophenol was favored at neutral pH in Degussa P25, while its degradation was preferred at pH 3.0 in Hombikat UV-100 dispersion. The observed kinetic constant (kobs) for the photodegradation of 2,4-dinitrophenol in 20 mg/L humic acid solution was found to be 15% (Degussa P25) and 21% (Hombikat UV-100) of the values obtained from the corresponding pure aquatic solutions. The suppression effects of β-cyclodextrin on the photodegradation of 2,4-dinitrophenol over Degussa P25 (50%) was much more significant than that of Hombikat UV-100 because of the different adsorption behavior of β-cyclodextrin over two TiO2. Hydroxyl radical and valance band hole was found to be the predominant reactant during the degradation of 2,4-dinitrophenol using P25 and UV-100, respectively. Formic acid, acetic acid, oxalic acid, and were detected as advanced oxidation products.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Xianquan Zhang,Lintao Yang,Ben Dang,Jiabo Tao,Shujun Li,Shuangliang Zhao,Wei Li,Jian Li,Zhijun Chen,Shouxin Liu
Wood-based solar steam generation devices (W-SSGDs) have enormous potential to produce pure water by distillation since they are sustainable, easily prepared and green. However, most W-SSGDs described so far have low solar-to-thermal efficiency (<1.5 kg m −2 h −1 ) under 1 standard sun irradiation. Inspired by nature, we have now engineered a W-SSGD with improved solar steam generation efficiency by using p -toluenesulfonic acid ( p -TsOH)-assisted hydrothermal treatment . After treatment, the wood lumens became more hydrophilic and were reduced in diameter from 40-60 μm to 10–20 μm. These rationally introduced changes lowered the enthalpy of vaporization of water and greatly enhanced the capacity of the wood for transportation of water. The as-prepared W-SSGD had an evaporation rate of 2.2 kg m −2 h −1 and an efficiency of 87%, which, to the best of our knowledge, are the highest reported values for a W-SSGD.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）