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
Journal of Cleaner Production
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2022
·
IF 11.072
Xiangyu Wang,Wei Zhang,Xu Zhang,Lang Ran,Quanlin Zhao,Binze Zou,Lincheng Zhou,Zhengfang Ye
Chloromethyl styrene-divinylbenzene (PS–Cl) resin was usually chemically modified for the adsorption of heavy metal ions in wastewater. However, this work will introduce a new application of resin for catalytic degradation of antibiotics. The core-shell PS-NH 2 @MIL-53(Fe) catalyst was fabricated by simple two-step route including chemical synthesis and step-by-step self-assembly strategy. The catalysts exhibited excellent catalytic activity toward the degradation of tetracycline (TC) in the presence of H 2 O 2 , with a degradation efficiency and degradation rate constant ( k ) of 94.15% and 0.05643 min −1 within initial 20 min, respectively. Moreover, the mineralization and stability of PS-NH 2 @MIL-53(Fe) both showed excellent performance. The advantage of PS-NH 2 @MIL-53(Fe) is that the degradation efficiency of TC could be modulated by the number of self-assembly. Additionally, we utilized the Yellow River water to explore the effect of the catalyst for TC removal in the actual wastewater treatment . Meanwhile, several possible catalytic degradation pathways were analyzed on the basis of using HPLC-MS to detect the intermediates generated in the process of catalytic degradation, and a potential catalytic degradation mechanism was proposed. In brief, the new application of amination resin modified by MIL-53(Fe) in catalytic degradation of TC shows promising prospect, especially in the field of environmental remediation.
研究领域:
环境科学
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催化化学
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废水处理
✓ 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
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农业
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植物科学
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毒理学
✓ 已验证
产品关联
DOI
PubMed
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
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细胞生物学
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环境科学
·
分析化学
✓ 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）