JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 10
·1-11
·
IF 2.426
Wang Guo-hui,Wu Guang-hao,He Man-li,Xu Tian-han,Liu Yun-fu,Yao Chu-qing,Dai Yao-dong
Using a melt-mixing technique, ethylene–vinyl acetate (EVA) copolymers based composites containing Multi-Wall Carbon nanotubes (MWCNTs), aluminum trihydrate (ATH), zinc borate (ZB), and gadolinium oxide (Gd 2 O 3 ) were fabricated. Then, the as-prepared samples were irradiated with an electron beam (EB) at the dose range varied from 0 to 275 kGy. Moreover, we investigated the properties of irradiated and unirradiated samples. Morphological observation showed good dispersion of MWCNTs and other additives in EVA. Furthermore, the gel content, mechanical properties, the limit oxygen index (LOI) values of irradiated composites increased to 28.4% after 250 kGy after irradiated. All the conclusions indicated that the comprehensive properties of the WMCNTs/EVA composites were improved by using high energy electron beam irradiation.
研究领域:
材料科学
·
核工程
·
高分子化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuhang He,Hua Ke,Yangcheng Lu
Controlled alcoholysis of ethylene–vinyl acetate copolymer (EVA) is very important both to industry and academic research. To this end, accurate kinetic model is an important tool, but traditional methods for studying reaction kinetics involving polymers are usually laborious and time consuming due to the need of product purification. Therefore, we developed a new method to study the alcoholysis of EVA with 32 mol% ethylene content based on in situ FTIR spectroscopy. The feasibility and accuracy of this method was carefully studied. A kinetic model for predicting reaction rate was obtained using this method. The applicability of the kinetic model was further verified by performing flow alcoholysis in microflow reactor. It was found that this kinetic model is pretty accurate for conversions up to around 60 %, even at a relatively high temperature. The in situ FTIR method may also be suitable for monitoring industrial production process and other alcoholysis systems like PVA.
研究领域:
高分子化学
·
化工工程
·
分析化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jing Liu,Hao Chen,Yan Lv,Lijun Yang,Wenjie Wang,Jianying Huang,Dandan Zhang
The mycotoxin-producing fungi contamination of foodstuffs and agricultural commodities is a serious problem. In this study, the efficacy of acetic acid (AcA), chitosan (CS), and CS with extra AcA (CS/extra AcA) against Aspergillus flavus ( A. flavus ) in vitro and in vivo were investigated. Results showed that CS/extra AcA strongly inhibited the mycelial growth and aflatoxins production of A. flavus at lower concentrations than CS (MIC > 16.0 mg/mL) or AcA (MIC: 0.31 %). Significant inhibition was achieved in the presence of 4.0/0.12 and 8.0/0.08 CS (mg/mL)/extra AcA (%). CS/extra AcA exhibited remarkable antifungal activities based on the results of spore germination inhibition, abnormalities of spore morphology, disruption of cell membrane, mitochondrial dysfunction, and induction of apoptosis of hyphae. Moreover, pathogenicity test in peanut kernels showed that 8.0/0.16 CS (mg/mL)/extra AcA (%) could effectively inhibit the fungal infection and aflatoxin B 1 production. The efficacy of CS/extra AcA is possibly due to the synergy of the antifungal property of CS, and undissociated AcA. The findings referred that CS/extra AcA is safe, efficient, and economical, and it could be used as a promising way to control A. flavus contamination in agro-foods preservation.
研究领域:
食品科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 69
·期 3
·228-238
·
IF 2.433
Jing-hui Yang,Ting-ting Zhang,Yong-sheng Zhang,Nan Zhang,Ting Huang,Yong Wang
Carbon nanotubes (CNTs) and barium titanate (BaTiO 3 ) (BT) were simultaneously introduced into the immiscible blend poly(ethylene- co -vinyl acetate)/thermoplastic urethane (EVA/TPU), and the EVA/TPU/CNT/BT quaternary polymer composite blends with core–shell structured island TPU domain were successfully prepared, in which CNTs in the TPU domain act as the core and the BT spheres at the interface of the TPU and EVA act as the shell. A core–shell structured island can lead to the formation of micro-capacitors and further accumulate electron storage owing to the incorporation of CNTs and BT; on the other hand, a BT shell can be assembled along the TPU spheres, reducing the possibility of formation of a conductive CNT network, resulting in suppressed dielectric loss. Therefore, CNTs and BT were tailor-made into blend composites with a core–shell structured domain, which can achieve an increased dielectric constant by 176% and decreased low dielectric loss by 80% compared with the blend composites with only CNTs in the TPU domain. © 2019 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Keguang Mu,Dalun Zhang,Ziqiang Shao,Dujian Qin,Yalong Wang,Shuo Wang
l -Dopa functionalized halloysite nanotubes (HNTs) were prepared by the self-polymerization of l -dopa in the weak alkaline condition. Then different contents of l -dopa coated HNTs (LPDHNTs) were blended into cellulose acetate to prepare enhanced performance ultrafiltration membranes via the phase inversion method . The HNTs and LPDHNTs were characterized by FTIR, XPS, and TEM anysis. And the membranes morphologies, separation performance, antifouling performance, mechanical properties and hydrophilicity were also investigated. It was found that the composite membranes exhibited excellent antifouling performance. The pure water flux of 3.0 wt% LPDHNTs/CA membrane increased from 11.4 L m −2 h −1 to 92.9 L m −2 h −1 , while the EA rejection ratio of the membrane was about 91.2%. In addition, the mechanical properties of the resultant membranes were strengthened compared with the CA ultrafiltration membrane.
研究领域:
材料科学
·
高分子科学
·
膜技术
·
生物医学工程
·
环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Shuang Wu,Zheni Wang,Lei Wan,Chenghui Luo,Shams Ali Baig,Xinhua Xu
In the present study, Pd/Ni foam electrode was prepared by improved impregnation method for electrocatalytic hydrodechlorination (ECH) of clofibric acid (CA). The effects of complexing agent addition into the impregnation solution for the formation of Ni(OH) 2 and the ECH activity of Pd/Ni foam electrode were investigated. Results revealed that the introduction of sodium acetate (the complexing agent) greatly enhanced the ECH activity as compared to common impregnation liquid. Characterizations analyses demonstrated that the addition of sodium acetate did not change the phase of the electrode’s surface, but effectively reduced the deposition of Ni(OH) 2 . The surface morphology of the electrode was changed simultaneously by the addition of sodium acetate and the interlacing structure of Ni(OH) 2 and Pd catalyst was formed. NaAc before -Pd/Ni and NaAc after -Pd/Ni foam electrodes were used to perform ECH experiments on CA, and the combined Pd/Ni foam 15 min electrode was compared with the Pd/Ni foam 6 h electrode. After 2 h of electrolysis, the NaAc after -Pd/Ni foam electrode was found to remove the CA (∼100%) in the solution, which was 1.3 times the removal rate of the Pd/Ni foam 6 h electrode to CA and exceeded the Pd/Ni foam 15 min electrode. Findings from the present study demonstrated that adding the complexing agent into the impregnation solution can improve the ECH activity of Pd/Ni foam electrode and achieve a faster and more efficient dechlorination effect of CA.
研究领域:
环境化学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Xia Wang,Qingxiang Wang,Qinghua Wang,Feng Gao,Fei Gao,Yizhen Yang,Hongxu Guo
A highly dispersible and stable nanocomposite of Cu(tpa)-GO (Cu(tpa) = copper terephthalate metal–organic framework, GO = graphene oxide) was prepared through a simple ultrasonication method. The morphology and structure of the obtained composite were characterized via scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis, Fourier-transform infrared (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). On the basis of the characterization results, the binding mechanism of the Cu(tpa) and GO was speculated to be the cooperative interaction of π–π stacking, hydrogen bonding, and Cu–O coordination. The electrochemical sensing property of Cu(tpa)-GO composite was investigated through casting the composite on a glassy carbon electrode (GCE), followed by an electro-reduction treatment to transfer the GO in the composite to the highly conductive reduced form (electrochemically reduced graphene, EGR). The results demonstrated that the electrochemical signals and peak profiles of the two drugs of acetaminophen (ACOP) and dopamine (DA) were significantly improved by the modified material, owing to the synergistic effect from high conductivity of EGR and unique electron mediating action of Cu(tpa). Under the optimum conditions, the oxidation peak currents of ACOP and DA were linearly correlated to their concentrations in the ranges of 1–100 and 1–50 μM, respectively. The detection limits for ACOP and DA were estimated to be as low as 0.36 and 0.21 μM, respectively.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Yang Liu,Haitao Huang,Pengfei Huo,Jiyou Gu
This study focused on the preparation of a new kind of membrane material, zwitterionic cellulose acetate (ZCA), via a three-step procedure consist of oxidization, Schiff base and quaternary amination reaction, and the fabrication of antifouling ZCA ultrafiltration membrane by the non-solvent-induced phase separation method (NIPS). The morphologies, surface chemical structures and compositions of the obtained CA and ZCA membranes were thoroughly characterized by field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray (EDX) spectroscopy, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), respectively. Meanwhile, the thermal stability, porosity and average pore size of two investigated membranes were also studied. As a result, the ZCA membrane displayed significantly improved hydrophilicity and water permeability compared with those of the reference CA membrane, despite a slight decrease in the protein rejection ratio. According to the cycle ultrafiltration performance of bovine serum albumin (BSA) solution and protein adsorption experiment, ZCA membrane exhibited better flux recovery property and fouling resistant ability, especially irreversible fouling resistant ability, suggesting superior antifouling performance. This new approach gives polymer-based membrane a long time life and excellent ultrafiltration performance, and seems promising for potential applications in the protein separation.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Candi Liu,Nan Zhang,Xin Huang,Qiwen Wang,Xiaohong Wang,Shengtian Wang
A novel two-dimensional ZnO-MoO 3 -C nanocomposite was synthesized by the green thermal calcination method with the biochar of mushroom derived carbon nanosheets and Zn 1.5 PMo 12 O 40 polyoxometallate. The nanocomposite was used to modify a glassy carbon electrode (GCE) for the first time to construct an acetaminophen (AP) electrochemical biosensor. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and nitrogen adsorption/desorption isotherm (BET) results showed that the synthesized ZnO-MoO 3 -C nanocomposite has many layered nanostructure and a large surface area. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) indicated that ZnO-MoO 3 -C/GCE presented highly effective and accurate toward the oxidation of AP due to the stable molecular structure of the electrode surface. The DPV response of the proposed sensor exhibited selectively and sensitively determination for AP with a wider linear dependence on the concentration of AP from 2.5 to 2000 μM, and lower limits of detection (LOD) 1.14 μM, compared with other carbon-base material modified GCE and GCE electrodes. In addition, the proposed sensor was applied to detection of AP in real samples, and the recovery was the range from 94.7 to 101.0%, and RSD was less than 5%. It indicates that the proposed sensor has a hopeful capacity of extensive applications in bioanalysis and tablets.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Carbohydrate Polymer Technologies and Applications
·
2021
·
IF 0
Yiru Wang,Wenrong Qin,Qi Liang,Feng Zhou,Chengyun Yan,Yueyi Deng
The purpose of this study was to enhance quercetin (Que) dissolution by preparing its ternary amorphous solid dispersions. The ternary amorphous solid dispersions were prepared by solvent evaporation method using hydroxypropylmethylcellulose acetate succinate (HPMCAS) and L-lysine (lys) as the carriers. The effect of the combination of polymer and amino acid on nucleation inhibition was evaluated by the nucleation induction time. Supersaturation tests were used to investigate the ability of maintaining Que supersaturation of the combination of polymer and lys. The dissolution results showed that the dissolution effect of ternary solid dispersions was better than binary solid dispersions. Stronger crystallization inhibition didn't lead to better dissolution effect and the dissolution of the prepared amorphous solid dispersions of Que was carrier-controlled. Lys modified the dissolution microenvironment of the solid dispersions, which made drug dissolution in the optimal pH environment, and effectively improved drug dissolution. Polymer/lys can be one of the most potential carriers for preparing amorphous solid dispersions of Que.
研究领域:
药剂学
·
药物化学
✓ 已验证
DOI
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Yahuan Wang,Zhiwei Wang,Shaomin Wang,Zhimin Chen,Jiafu Chen,Yong Chen,Jianwei Fu
Developing excellent dye adsorbent with high adsorption capability and good reusability and clarifying the interaction mechanism between adsorbent and adsorbate are highly desired for eliminating water pollution. Herein, we present a novel magnetic adsorbent Fe 3 O 4 /poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) nanotube modified by glacial acetic acid (defined as Gl-PZSNTs-Fe 3 O 4 ) to remove cationic dye methylene blue (MB) from aqueous solution. Compared with the unmodified magnetic PZSNTs-Fe 3 O 4 , the Gl-PZSNTs-Fe 3 O 4 exhibits rapid adsorption rate and high adsorption capacity. The adsorption equilibrium data was fitted well with Langmuir model, and the adsorption kinetics obeyed the pseudo-second-order kinetics model and Elovich model. Thermodynamic analysis showed that the MB adsorption onto the Gl-PZSNTs-Fe 3 O 4 was endothermic and spontaneous. Especially, through contrasting the adsorption behavior of Gl-PZSNTs-Fe 3 O 4 and PZSNTs-Fe 3 O 4 towards MB dye, we highlighted the importance of glacial acetic acid modification for enhancing the adsorption capacity of the Gl-PZSNTs-Fe 3 O 4 . Meanwhile, we also proposed the adsorption mechanism of the Gl-PZSNTs-Fe 3 O 4 towards MB dye.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Wenxin Zhang,Min Xue,Jing Fan,Lili Qiu,Wenxiang Zheng,Yangyang Liu,Zihui Meng
As a widespread air pollutant, volatile organic compounds (VOCs) are harmful to the human body’s skin, nervous system, and respiratory system. Low-cost, extensive, and continuous detection of VOCs is of great significance to human health. We infiltrated and coated cellulose acetate on the inverse opal photonic crystal skeleton of methylcellulose–polyvinyl alcohol–graphene oxide to construct a degradable, high-toughness cellulose VOC sensor. Cellulose acetate enhances the response to VOCs and achieves a highly selective response to acetone vapor due to the smaller Flory–Huggins parameter with acetone. This work proposes a general, simple, easy-to-use, and highly selective photonic crystal VOC sensor development strategy. Calculated from the Flory–Huggins solution theory, a suitable polymer was selected to modify the inverse opal photonic crystal framework and achieve high selectivity detection.
研究领域:
材料科学
·
环境科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）