EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Yaoqin Wu,Zhiping Zhao,Changmei Sun,Chunnuan Ji,Ying Zhang,Rongjun Qu,Ying Wang
In this paper, aramid nanomaterials (ANM) were successfully prepared in N -methyl pyrrolidone (NMP) solution containing polystyrene (PS) by in-situ condensation of para -phenylenediamine (PPD) and para -benzoyl chloride (TPC). Transmission electron microscopy (TEM) images showed that the morphologies of ANM varied significantly including nanosphere, nanorod and nanobundle, all of which depended on the reactant concentration. The obtained ANM with different morphologies could uniformly distribute within PS matrix without undesirable agglomeration and poor compatibility with PS. ANM/PS nanocomposites were prepared simply by solution method. The fracture cross sections and surface roughness of ANM/PS were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Furthermore, thermal stability and mechanical properties of ANM/PS were tested. It was shown that ANM significantly improved the mechanical properties and thermal stability of PS, which may open up opportunities for new applications of these ANM/PS nanocomposites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ANALYST
·
2019
·Vol. 144
·期 16
·4897-4907
·
IF 4.019
Rui-Qian Zhang,Zhan-Qing Liu,Yan-Ling Luo,Feng Xu,Ya-Shao Chen
Novel nanocomposites consisting of polystyrene-block-polybutadienyl polyhexamethylene dicarbamate-block-polystyrene (PS-b-HTPB5-b-PS) and multiwalled carbon nanotubes (MWCNTs) were designed and prepared via noncovalent interactions. Scanning electron microscopy and transmission electron microscopy observations showed that segregated networks of MWCNTs were formed due to the cladding of PS-b-HTPB5-b-PS, presenting a parallel-arranged topology of the MWCNTs in a continuous PS-b-HTPB5-b-PS phase, which improved the dispersibility of the MWCNTs. The nanocomposites were fabricated into vapor sensing elements to detect CH2Cl2 vapor in the environment, exhibiting excellent responsive sensitivity, reproducibility and a low limit of detection (LOD) of 1 ppm when exposed to CH2Cl2 vapor. The chain extension of HTPB overcame the fragility and improved the tenacity of the thin films, and the responsivity was optimized by adjusting the content of the MWCNTs and the length of the PS chains. The newly developed conductive composites can be applied as a promising vapor sensor to accurately monitor CH2Cl2 vapor in the environment.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2019
·Vol. 31
·期 5
·913-921
·
IF 2.691
Chao Chen,Pengcheng Zhao,Chunyan Li,Yixi Xie,Junjie Fei
A new type of temperature-responsive electrochemical sensor was constructed based on a glass carbon electrode modified by the composite containing temperature-responsive polymer polystyrene-poly N, N-diethyl acrylamide-polystyrene (PS-PDEA-PS) and fullerenes-carboxylate multi-walled carbon nanotubes (C 60 -MWCNTs). The sensor was used for the electrochemical detection of catechol (CC). When the temperature is higher than the critical temperature (LCST) of PS-PDEA-PS, the electrochemical behavior of CC can be detected, which it is in the “on” state. When the temperature is lower than LCST, the composite modified film is in the “off” state and the electrochemical behavior of CC was not detected. Under the best experimental conditions, the sensor has a good detection range for catechol from 4.0 to 135.0 μM, with a LOD of 1.45 μM. In addition, the proposed sensor has good stability and reproducibility, and was successfully applied to the determination of catechol in real tap water.
研究领域:
分析化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Yu Xing,Jing Li,Jingjing Yang,Junyi Li,Weiyi Pang,Francis L. Martin,Li Xu
Humans are routinely exposed to nanoplastics (NPs) in various ways, and this exposure presents a significant health risk. Nevertheless, there remain gaps in our knowledge, particularly in the mechanisms of toxicity of NPs with different surface charges at very low environmental concentrations. Herein, a spectrochemical approach was used to profile the cytotoxicity of NPs with different surface charges in HepG 2 cells. It was found that all three NPs can cause some biomolecular alterations in cells, affecting cellular lipids, proteins, amino acids, and genetic material. Of these, PS and PS-COOH led to a non-linear dose-response, which may be related to a biphasic dose-response, whereas PS-NH 2 led to a linear dose-response with a gradual increase in toxicity with increasing exposure concentration. In addition, the spectroscopic results showed that surface modifications led to cellular biochemical changes and caused adverse biological effects, with PS-NH 2 exhibiting higher toxicity compared to PS or PS-COOH along with an inhibition of cell proliferation. Surprisingly PS-COOH, although considered the least toxic NP, appears to cause DNA damage. Overall, the toxic effects of different surface-modified NPs in cells were detected for the first time by applying spectrochemical techniques, and these findings provide important data towards understanding the emerging widespread environmental pollution of NPs and their effects on humans.
研究领域:
毒理学
·
细胞生物学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 19
·13716-13727
·
IF 3.3
Caihong Wang,Yong Liu,Fengshen Han,Yongzhe Han,Tianyu Liu,Haitao Ren,Xu Han
Using metal-free catalysts is widely recognized as a promising approach toward wastewater remediation because of the absence of metal leaching. However, the oxidation products involved in the oxidation process and the corresponding mechanisms are still not clear. In this work, N-doped carbocatalysts (CN) were fabricated using as-prepared g-C3N4 and glucose solution, and the reactivity of the as-prepared catalysts was optimized by controlling calcination temperature. Correspondingly, increasing the calcination temperature promotes the catalytic oxidation of BPA. The positive correlations between the contents of pyridinic-N and graphitic-N and the kobs values of BPA oxidation, as well as XPS analysis indicate the important roles of pyridinic-N and graphitic-N in BPA oxidation. According to the series of characterizations of the oxidation products and Raman analysis of the reaction process, the moderately activated persulfate (PS) on the CN catalyst is the predominant species in BPA oxidation and BPA can be oxidized to BPA polymers with high selectivity by H-abstraction under alkaline conditions. This work highlights the important role of the moderate activation of PS in the polymerization of phenolic contaminants under alkaline conditions, which enriches our understanding of the oxidation of aromatic contaminants by PS under alkaline conditions.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 18
·46222
·
IF 1.901
Xia Gao,Tianbo Zhao,Guan Luo,Baohui Zheng,Hui Huang,Rui Ma,Xue Han,Yuqiao Chai
Polystyrene (PS) microencapsulated paraffin wax (MePW) and PS–SiO 2 MePW were used to improve the form-stability of PW in hydroxyl-terminated polybutadiene-derived polyurethane (HTPB) binder. HTPB matrix containing different contents of PS MePW, PS–SiO 2 MePW, and PW were prepared. The chemical composition, crystallinity, microstructure, heat capacities, thermal stabilities, thermal reliabilities, leakage, and mechanical properties of the composites were compared using Fourier transforms infrared spectroscope, X-ray diffractometer, scanning electronic microscope, differential scanning calorimeter, thermo-gravimetric analyzer, thermal cycling test, leaking test, compression, and tensile tests, respectively. The results showed that the MePW/PW/HTPB composites were prepared without chemical reaction. The thermal stability and mechanical properties of PS–SiO 2 MePW/PW/HTPB increased more dramatically than that of PS MePW/PW/HTPB. With the increasing contents of MePWs, the PW leakage of the composites decreased, especially for PS MePW/PW/HTPB. Consequently, the MePW/PW/HTPB composites possess a potential application for PW-based polymer-bonded explosive system. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46222.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Xiaoyan Tang,Manjia Chen,Muzi Li,Huanping Liu,Hao Tang,Yang Yang
Micro(nano)plastics are ubiquitous in the environment. Among the microplastics, imidacloprid (IMI) concentration has been increasing in some intensive agricultural regions, thus receiving increased attention. However, only a few studies have investigated the interaction of nanoplastics (polystyrene (PS)) and IMI in vegetable crops. We studied the effects of positively (PS-NH 2 ) and negatively (PS-COOH) charged nanoplastics on the uptake, translocation, and degradation of IMI in Chinese flowering cabbage grown in Hoagland solution for 28 days. PS-NH 2 co-exposure with IMI inhibited plant growth, resulting in decreased plant weight, height, and root length. Translocation of IMI from the roots to the shoots was significantly lower in the presence of PS-NH 2 , whereas PS-COOH accelerated the accumulation and translocation of IMI in plants, thus potentially affecting IMI metabolism in plants. Notably, IMI-NTG and 5-OH-IMI were the two dominant metabolites. PS-NH 2 co-exposure with IMI induced significant oxidation stress and considerably affected the activities of superoxide dismutase (SOD) and peroxidase (POD), indicating that the antioxidant defense system was the main mechanism for reducing oxidative damage. Notably, both positively and negatively charged nanoplastics can accumulate in Chinese flowering cabbage. Plants in the PS-COOH alone treatment group had the highest concentration of nanoplastics in both roots and shoots. The accumulation of nanoplastics, IMI, and its metabolites in plants raises concerns about their combined potential toxicity because it compromises food safety.
研究领域:
环境科学
·
农业
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植物科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Tu Feng-Yuan,Wang Ming-Feng,Zhong Gang,Qiao Hua-Wei,Zheng Bo-Tuo,Liu Can-Pei,Chen Ming-Feng,Zhang Hua-Gui
Compatibilization is crucial for the blending of immiscible polymers to develop high-performance composites; however, traditional compatibilization by copolymers (pre-made or in-situ generation) suffers from weak interface anchoring, and inorganic particles have gained extensive attention recently owing to their large interfacial desorption energy, while their low affinity to bulk components is a drawback. In this study, an interfacial atom transfer radical polymerization (ATRP) technique was employed to grow polystyrene (PS) and poly(2-hydroxyethyl methacrylate)(PHEMA) simultaneously on different hemispheres of Br-functionalized SiO 2 nanoparticles to stabilize a Pickering emulsion, whereby a brush-type Janus nanoparticle (SiO 2 @JNP) was developed. The polymer brushes were well-characterized, and the Janus feature was validated by transmission electron microscope (TEM) observation of the sole hemisphere grafting of SiO 2 -PS as a control sample. SiO 2 @JNP was demonstrated to be an efficient compatibilizer for a PS/poly(methyl methacrylate) (PMMA) immiscible blend, and the droplet-matrix morphology was significantly refined. The mechanical strength and toughness of the blend were synchronously enhanced at a low content SiO 2 @JNP optimized ~0.9 wt%, with the tensile strength, elongation at break and impact strength increased by 17.7%, 26.6% and 19.6%, respectively. This enhancement may be attributed to the entanglements between the grafted polymer brushes and individual components that improve the particle-bulk phase affinity and enforce interfacial adhesion.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Jingwen Zhao,Peng Zhu,Huapeng Zhang
A ternary polymer–solvent mixture has already been proposed to prepare surface porous films. However, the uncertainty of the formation mechanism of surface porous films and the multitude of influencing factors with unclear priorities lead to the failure to promote this method. Here, a surface-porous polystyrene (PS) film with a pore size of 0.6 μm was successfully prepared from a ternary PS/poly(ethylene glycol)–tetrahydrofuran (PEG–THF) mixture, using ultrasonic dissolution to provide a dispersion effect. The total polymer concentration, PEG molecular weight, PS/PEG mass ratio, dissolution temperature, and evaporation temperature can help to optimize surface porous structures. Based on the rheological behavior of the ternary PS/PEG–THF mixture and comparative experiments with the traditional dissolution method, the formation mechanism of surface porous structures has been revealed. After dissolution, the ternary mixture should be viewed as a two-phase dispersion, emphasizing the dispersion effect of the dissolution process. The formation of surface pores is derived from the transportation, arrangement, and evaporation of dispersed PEG–THF domains. Thus, the preparation of high-quality surface porous films through a ternary polymer dispersion mainly requires attention to two points: the dissolution and dispersion method and the solvent selection. To obtain submicron surface porous films, a synergistic effect of the two is required.
研究领域:
高分子科学
·
材料工程
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Bangdong Ge,Zongsheng Liu,Yi Zheng,Shiyang Zhu,Meng Ma,Si Chen,Yanqin Shi,Huiwen He,Yulu Zhu,Xu Wang
PC/ABS (polycarbonate/acrylonitrile-butadiene-styrene) alloy has poor mechanical properties due to its poor compatibility and weak interfacial adhesion, which limits its application range. Therefore, it is necessary to compatibilize and modify the PC/ABS alloy to improve the compatibility and enhance the interfacial adhesion of the two phases. Reactive compatibilizers are frequently utilized to enhance the compatibility of incompatible polymer blends. However, traditional reactive compatibilizers often form graft copolymers with asymmetric molecular structure during melt blending, which frequently "migrate in" and "migrate out" under the influence of shear force, leading to a decrease in the compatibilization efficiency of compatibilizers. In this work, ethylene-maleic anhydride alternating copolymer (ZeMac) with more reactive sites was used as a reactive compatibilizer, and amino-terminated polystyrene (PS–NH 2 ) with good compatibility with ABS was synthesized via free radical polymerization. Combined with the difference of affinity between PC, ABS and ZeMac, and the difference of reactivity between PC, PS-NH 2 and ZeMac, a double-comb compatibilizer was constructed in-situ at the interface of the two phases by changing the blending sequence of raw materials in the melt blending process. Firstly, PC was blended with ZeMac, and then blended with ABS and PS-NH 2 to prepare (PC/ZeMac-1)/(ABS/PS-NH 2 -1) alloy with excellent comprehensive properties. Compared with PC/ABS alloy, the notched impact strength of (PC/ZeMac-1)/(ABS/PS-NH 2 -1) alloy increased from 62.0 kJ/m 2 to 90.2 kJ/m 2 , increased by 45 %. It can be seen from the microstructure of the cyclic tensile section that the debonding phenomenon of the PC/ABS alloy interface gradually weakened with the addition of ZeMac and PS-NH 2 , which proved that the compatibility of PC and ABS phases was improved. This study provides a certain reference value for the design of high-efficiency compatibilizers and the preparation of high-performance composites.
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
Environmental Technology & Innovation
·
2021
·
IF 5.263
Yanghao Pu,Zhengfeng Xie,Xingyu Gong,Yuru Yan,Jun Zhang
Design and fabrication of structurally optimized absorbents are important for wastewater treatment such as dyes removal. Herein, modifying the environmentally harmful waste polystyrene foam as an efficient recyclable adsorbent for organic dyes is important Magnetic amidated modified polystyrene (Fe 3 O 4 /PS-SD) was prepared by Friedel–Crafts reaction, N,N”-dicyclohexylcarbodiimide (DCC) dehydration condensation, and chemical co-precipitation reaction. Fe 3 O 4 /PS-SD had highly efficient removing performance for organic dyes in large volume of water sample solutions, and the equilibrium was achieved in 0.5 h. The maximum adsorption capacity for Methylene blue (MB), Safranine T (ST), and Congo red (CR) were 620.32 mg g −1 , 679.63 mg g −1 , and 1425.77 mg g −1 , respectively, at room temperature according to the Langmuir adsorption isotherm (R 2 > 0.91). The kinetic data of the three dyes followed pseudo-second-order kinetics. After ten regeneration cycles, the removal rate remained high (> 80%). Experimental results showed that Fe 3 O 4 /PS-SD was an excellent adsorbent for water treatment with high regeneration property and thermal stability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Long Zhang,Haonan Liu,Qi Xin,Lijuan Tang,Jie Tang,Yin Liu,Le Hu
Concerns regarding the environmental hazards and health risks of nanoplastics (NPs) are increasing. However, quantifying of NPs in vivo remains challenging. In this study, we propose a strategy for using magnetic resonance imaging (MRI) to quantify NPs internalized by mouse macrophages. Model NPs (Fe 3 O 4 @PS) with more homogeneous sizes and morphologies were obtained by encapsulating Fe 3 O 4 in polystyrene . A standard curve was generated by linearly fitting the intensity and concentration charts to the Fe 3 O 4 @PS MRI data. The mass of Fe 3 O 4 @PS captured by the mouse macrophages was estimated using a standard curve. An explanation of how the standard curves were created and used is provided in the text. The accuracy of the MRI results was demonstrated using, inductively coupled plasma (ICP). Quantitative results from MRI and ICP revealed that the mouse macrophage uptake increased as NPs concentrations decreased. According to the ICP results, when the NPs exposure concentration was 10 μg/mL, the uptake rate by mouse macrophages was 63.0 %. The quantitative MRI results were slightly lower than those for ICP, with an uptake rate of 57.7 % in mouse macrophages at the same concentration. Therefore, MRI provides a new perspective for quantitative NPs analysis.
研究领域:
环境科学
·
医学影像
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）