CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Jianming Pan,Jun Zeng,Qin Cao,Heping Gao,Yongchao Gen,Yinxian Peng,Xiaohui Dai,Yongsheng Yan
In this work, the hierarchical porous foams (HPFs) were fabricated and applied as the novel adsorbent for simultaneous removal of λ-cyhalothrin (LC) and Cu(II). Macroporous poly(glycidyl methacrylate) foams (MPGMA) with highly interconnected pore network were firstly prepared by high internal phase emulsions (HIPEs) template. Then carboxylated mesoporous silica nanoparticles (CMSNs) were grafted onto the interface of macroporous foams via the reaction between epoxy groups on MPGMA and carboxyl groups on CMSNs . The as-prepared HPFs composites possessed macropores ranging from 10 μm to 40 μm and uniform mesopores on average of 2.5 nm, and their large amount of carboxyl groups resulted in a favorable adsorption for λ-cyhalothrin (LC) and Cu(II). In single adsorption, the maximum adsorption capacity of HPFs for LC and Cu(II) were 80.11 mg g −1 and 21.79 mg g −1 at 288 K, respectively. The adsorption mechanism between LC and HPFs could be the hydrogen bonding and hydrophobic interaction, while the electrostatic attraction maybe the main interaction between Cu(II) and HPFs. Binary adsorption showed that the enhanced adsorption capacity of LC was 104.1 mg g −1 in the presence of 15 mg L −1 Cu(II) at 288 K, and the excellent result of Cu(II) was 22.23 mg g −1 with the mixed solution of 50 mg L −1 LC at 288 K, indicating the existence of promotion in adsorption ability in the case of coexistence of LC and Cu(II). Moreover, HPFs could maintain stability after five adsorption/desorption cycles in the regeneration steps.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Ming Huang,Yan Luo,Yi Zhong,Min Xiao,Jiancan Hu
In this paper, a new type of microcapsulated phase change materials (BS-TD/PALMA microPCMs) with butylstearate (BS) and tetradecanol (TD) as binary cores and poly (allyl methacrylate) (PALMA) as shell, was prepared for thermo-regulated fibers. The surface morphology, particle size distribution, thermal properties and thermal stability of the resulting microcapsules were investigated. The results showed that the melting temperature and mean diameter of BS-TD/PALMA microPCMs were 20.1-32.6 °C and 1.3 ± 0.3 μm, respectively. The latent heat and encapsulation efficiency reached up to 73.3 J g −1 and 76.4 wt.%, respectively. BS-TD/PALMA microPCMs displayed good thermal stability. They were greatly favorable for the application to thermo-regulated fibers.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Rong Qu,Zijie Ren,Na Li,Fangfang Zhang,Zhengyu Jason Zhang,Haining Zhang
Design and synthesis of effective catalysts for the conversion of epoxy compounds to cyclic carbonate under the presence of carbon dioxide molecules is essential for the utilization of carbon dioxide. Herein, we report that the surface-attached imidazolium-type poly(ionic liquid) bearing amine moieties is an efficient catalyst for the conversion of epoxy compound and carbon dioxide to cyclic carbonate. The effect of chemical structure of the synthesized catalyst and the reaction conditions on the catalytic efficiency is systematically studied. The results show that the catalyst with bromide anion can effectively catalyze the reaction under 1.5 MPa carbon dioxide pressure at 120 °C with the catalyst content of 10 mg mL −1 , reaching the conversion rate up to 90 %. Moreover, the synthesized catalyst can be separated from the cyclic carbonate products by centrifugation. The recyclability and reversibility measurements reveal that the decay of the catalytic activity is mainly resulted from the adsorption of the cyclic carbonate products on the catalysts. The catalytic activity of the synthesized catalyst towards conversion of epichlorohydrin and carbon dioxide to cyclic carbonate can be recovered after extraction of the adsorbed cyclic carbonate products.
研究领域:
化学工程
·
催化化学
✓ 已验证
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2021
·
IF 1.82
Hongnan Zhang,Tingting Zhang,Qiaohua Qiu,Xiaohong Qin
In this experiment, octadecyltrimethylammonium chloride (STAC), a cationic antibacterial agent, was designed to modify hydrolyzed polyacrylonitrile (PAN) through tight electrostatic attraction. Then, the modified PAN was successfully electrospun with polycaprolactone (PCL) to obtain PCL/PAN-STAC nanofibrous membranes with enhanced mechanical properties. The modified PAN was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis and elemental analysis. The morphological, mechanical and antibacterial properties of nanofibrous membranes were investigated. The blended nanofibrous membrane presented a uniform and stable structure with small pore size. Tensile tests indicated that the mechanical property of PCL/PAN-STAC nanofibrous membrane was obviously enhanced by blending. Disk diffusion tests showed that the inhibition zones of PCL/PAN-STAC against Escherichia coli and Staphylococcus aureus were 7.56 ± 0.05 mm and 15.37 ± 0.34mm, respectively. Shaking method indicated that the antibacterial activity against E. coli was as high as 96.20 ± 0.89% when the use of PCL/PAN-STAC reached 9 mg. Therefore, this antibacterial nanofibrous membrane is very favorable for applications such as protective filtration masks and wound dressing.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 46
·48219
·
IF 2.188
Wan Li,Xingjiang Liu,Jinbi Wu,Linzhi Wu,Ailing Sun,Liuhe Wei
A new two-component modified polyurethane (PU) sealant was designed and synthesized for insulating glass. This sealant was designed based on a crosslinked reaction between a p -chlorophenol-blocked PU pre-polymer (Pre-polymer 2 ) in Component A and a poly-functional hyperbranched polyamine polymer (polyamide resin 300 # ) in Component B. During the synthesis of Pre-polymer 2 , Fourier transform infrared spectral analysis was used to track the process, and the optimal reaction time and temperature were 1.5 h and 80 °C, in the presence of 4, 4′-diphenylmethane diisocyanate (MDI). Different curing agents also used as deblocking agents were screened and it was found that polyamide resin 300 # was a good candidate for the curing reaction. In addition, the low-temperature curing rate was also improved by using dibutyltin dilaurate (DBTDL) and organobentonite together as a composite catalyst. Finally, the prepared two-component modified PU sealant for insulating glass was successfully used in an assembly line with good performance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48219.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2010
·Vol. 48
·期 24
·5643-5651
·
IF 3.971
Peng-Fei Gou,Wei-Pu Zhu,Zhi-Quan Shen
Novel calixarene-centered amphiphilic A 2 B 2 miktoarm star copolymers composed of two PCL arms and two PEG arms with calix[4]arene as core moiety were synthesized by the combination of CROP and “click” chemistry. First, a heterotetrafunctional calix[4]arene derivative with two hydroxyl groups and two alkyne groups was designed as a macroinitiator to prepare calixarene-centered PCL homopolymers (C4-PCL) by CROP in the presence of Sn(Oct) 2 as catalyst at 110 °C. Next, azide-terminated PEG (A-PEG) was synthesized by tandem treating methoxy poly(ethylene glycol)s (mPEG) with 4-chlorobutyryl chloride and NaN 3 . Finally, copper(I)-catalyzed cycloaddition reaction between C4-PCL and A-PEG led to A 2 B 2 miktoarm star copolymer [C4S(PCL) 2 -(PEG) 2 ]. 1 H NMR, FT-IR, and SEC analyses confirmed the well-defined miktoarm star architecture. These amphiphilic miktoarm star copolymers could self-assemble into multimorphological aggregates in water. The calix[4]arene moieties with a cavity <1 nm on the hydrophilic/hydrophobic interface of these aggregates may provide potential opportunities to entrap guest molecules for special applications in supermolecular science. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010
研究领域:
高分子化学
·
超分子科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 5
·570-578
·
IF 4.1
Sun Xiao-Fei,Zhang Xu,Song Shu-Ping,Yao Ya-Qun,Zhang Yan,Wang Cheng-Liang,Sun Jing-Jiang,Wang Qing-Fu
L -glutamic acid (LA) is a bio-based, non-toxic, environmentally friendly material derived from biomass. The present study reports the application of Passerini three-component polymerization (P-3CP) for the straightforward preparation of LA-based light-responsive polyesters (PLTDs) under mild conditions. PLTDs with molar masses up to 8500 g/mol and high yields exceeding 90% are obtained. The chemical structures and light-responsive self-immolative behavior of PLTDs are comprehensively characterized by employing ultraviolet-visible (UV-Vis) spectroscopy, size exclusion chromatography (SEC), nuclear magnetic resonance (NMR) spectroscopy, and liquid chromatography mass spectrometry (LC-MS). Meanwhile, monodisperse PLTD-based doxorubicin-loaded nanoparticles (PLTD-DOX-NP) (size=193 nm, PDI=0.018) are formulated by nanoprecipitation method. Upon light-induced depolymerization, the PLTD-DOX-NP undergoes rapid decomposition, resulting in a burst release of 80% cargo within 13 s. Furthermore, according to biological toxicity tests, the PLTD-NP possesses adequate biosafety, both before and after irradiation. Overall, the incorporation of P-3CP with biorenewable LA-based monomer adheres to the principles of green chemistry, significantly simplifying the synthetic pathway of light-responsive polymers.
研究领域:
材料科学
·
生物医学工程
·
绿色化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaohang Kou,Jiaolong Zhang,Ruhong Li,Zijie Xiao,Chaolin Li,Wenhui Wang
Developing electrolytes qualified for high-voltage (>4 V vs Li/Li + ) conditions is of great significance for high-energy density Li-metal batteries (LMBs). Carbonate-based electrolytes possess high oxidation stability, whereas the uneven Li deposition, low Coulombic efficiency (CE) and poor anodic stability of such electrolytes severely impede the practical application in high-voltage LMBs. Herein, a 1.8 M lithium bis(trifluoromethanesulphonyl)imide (LiTFSI)-carbonate electrolyte with high compatibility with both Li anode and high-voltage cathode is designed. LiNO 3 is introduced into the electrolyte as an additive with the assistance of CuF 2 cosolvent, which efficiently enables robust and conductive interfaces at both anode and cathode sides. As a consequence, an average CE of 98.0% is achieved for Li||Cu half-cell at 1 mA cm −2 . Li||LiNi 0.8 Co 0.1 Mn 0.1 O 2 full cell fabricated with cathode areal capacity of 2.4 mAh cm −2 and 5× excess Li achieves a high capacity retention of 80.7% after 200 cycles with cut-off voltage of 4.3 V. This work provides a facile and effective approach to improve the application of carbonate-based electrolytes in high-voltage LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1023-1030
·
IF 3.1
Zheng Zhiwen,Dai Xin,Li Xueyang,Du Chang
M ore and more concerns about health bring the increasing demand for blood contact tissue engineering alternatives. In this paper, nanoparticles of poly(lactic-co-glycolic acid)/polyethyleneimine mixed with recombinant hirudin(rHNPs) were prepared by a double emulsion solvent volatilization method, which were then loaded onto the polycaprolactone(PCL) with polydopamine(PDA) coating to form the composite nanofibers of PCL/PDA/rHNPs. The hydrophilicity and mechanical properties of the composite nanofibers were improved significantly compared with pure PCL. The morphology kept almost unchanged after 30 d of degradation in phosphate buffer saline (PBS). The anticoagulant molecule of hirudin could be gradually released from the composite scaffolds through the degradation of rHNPs in vitro . When the concentration of rHNPs suspension was 5.0 mg/mL, the composite nanofibers could better promote the growth and proliferation of human umbilical vein endothelial cells(HUVECs). The anticoagulant ability of the composite nanofibers was also significantly improved in comparison with that of pure PCL. The design of controlled release anticoagulant materials would alleviate the sudden release of simple fixed hirudin, which could also provide a new idea for the development of novel blood contact materials.
研究领域:
生物材料学
·
组织工程学
·
药物释放系统
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 31
·期 1
·1-14
·
IF 2.8
Song T.,Ren L.,Li W. B.,Liu Q.,Qin Y. X.,Zhang Y. L.,Wang Y. B.,Shen Y. D.,Du W. N.,Zhang M. Y.
In this contribution, isosorbide dinonanoate (SDN), an environmentally sustainable plasticizer for polypropylene (PP), is successfully synthesized by virtue of esterification reaction using isosorbide and nonanoic acid with the reaction temperature of 120 °C, and the reaction time of 5 h. When the corporation of plasticizer SDN into PP matrix is the value of 15 phr, the impact strength of PP blends reaches 121 J/m, the dramatically increase of 384% compare to that of PP. DMA results shows that the glass transition temperature (T g ) of PP blends gradually decline with the increasing amount of SDN, indicating the efficient plasticization action of the SDN. It is suggested that SDN can be feasibly inserted into the non-polar matrix and then more evenly dispersed in matrix, herein, it will increase the distance between the polymer chains, improving the mobility of the molecular chains and the processing performance of the polymers. Furthermore, the plasticizing effect and environmental friendliness of SDN can be a potential replacement for o-phenyl plasticizers in the industry in the future.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2018
·Vol. 26
·期 4
·365-373
·
IF 1.767
Ling Lei,Li Jinhui,Zhang Guoping,Sun Rong,Wong Ching-Ping
Self-healing polymeric materials have attracted extensively interests due to the ability to heal the damage autonomously. The self-healing systems based on dynamic disulfide bonds have been the most promising due to the efficient healing capacity at a mild condition. However, it is still of great challenge for designing the polymer with excellent mechanical and self-healing property by a simple synthetic route. Herein, a novel series of self-healing linear polyurethanes with the disulfide linkage as the grafting point were developed. The synthetic polymers all exhibited excellent mechanical properties (breaking strength and elongation at break were as much as 31.91 MPa and 1156% for PU-A). Meanwhile, the effects of different ratios of soft/hard segments on the mechanical properties and healing efficiencies have been investigated by stress-strain tests. The results showed that with the increase of soft segments contents, the breaking strength and elongation at break of the polymer improved significantly, while the healing efficiency and Young’s modulus showed a declining trend. The self-healing polyurethane can quickly restore its over 90% of mechanical property after healing at moderate temperature for 10 min. The cyclic tensile tests also showed the dissipated efficiencies and self-recovery abilities of the polymers. Finally, the recovery capability tests verified the shape memory effect in the polymers, which can replace an external force to accelerate the healing process.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2014
·Vol. 52
·期 7
·1020-1027
·
IF 3.245
Danfeng Yang,Dan He,Yonggui Liao,Zhigang Xue,Xingping Zhou,Xiaolin Xie
The polar solvents, N -methylpyrrolidone (NMP), N , N -dimethylformamide (DMF), and acetonitrile (CH 3 CN) were used as ligands for iron(III)-mediated activators generated by electron transfer atom transfer radical polymerizations (AGET ATRPs) of methyl methacrylate (MMA) with various initiators and reducing agents. Polymerizations were conducted with a molar ratio of [MMA] 0 /[initiator] 0 /[FeBr 3 ] 0 /[reducing agent] 0 = 100:1:1:0.5 and a volume ratio of MMA/solvent = 2:1 at 60 °C to investigate the effects of initiator, solvent and reducing agent, and most of the systems showed the typical features of “living”/controlled radical polymerization. In order to get a deeper understanding of the mechanism, the amount of the reducing agent was changed to study the polymerization behavior. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 1020–1027
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）