DESIGNED MONOMERS AND POLYMERS
·
2019
·
IF 1.528
Meng-Di Chen,Guo Zhang,Shi-Chang Chen,Xian-Ming Zhang,Wen-Xing Chen
In this study, 9-anthracenemethyl methacrylate (AMMA) and styrene (St) as monomers and benzoyl peroxide as an initiator were used to synthesize P(St-co-AMMA), a macromolecule tracer with a fluorescence effect, via free radical copolymerization. A fluorescent online detection device was built on the basis of the principle of fluorescence online detection by using the single-screw extrusion platform of a torque rheometer to explore the effect of the amount of macromolecular tracer and screw speed on the residence time distribution of polystyrene in single-screw extrusion. Fourier transform infrared spectroscopy, 1H-NMR, thermal stability, fluorescence properties, and rheological properties show that the resulting product P(St-co-AMMA) has a degree of thermal stability, fluorescence, and rheological properties similar to polystyrene, so this product can be used to characterize the residence time distribution during single-screw extrusion. The amount of macromolecular tracer P(St-co-AMMA) does not affect the residence time distribution of polystyrene during single-screw extrusion processing, meanwhile, the minimum residence time decreases and the residence time distribution becomes narrow as the screw speed increases, that is, the axial mixing capacity of the single-screw extruder decreases as the screw speed increases.
研究领域:
高分子化学
·
材料科学
·
聚合物加工工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
·
IF 3.7
Xiangyi Kong,Jie Cheng,Wei Meng,Shujing Han,Zhen Song,Zhiwen Qi
As a volatile organic compound (VOC), styrene can pose significant risks to human health and environment if released into the air without proper treatment. Absorption based on ionic liquids (ILs) has been widely regarded as a promising VOC treatment approach, whereas there is limited research on capturing styrene by ILs. In this work, a multilevel framework was proposed to screen IL absorbents from the largest number of cation-anion combinations in the latest COSMObase. The COSMO-RS model is applied to estimate the absorption and desorption potentials of all IL candidates for styrene capture based on solubility prediction, while important physical properties of them namely melting point, viscosity, and toxicity are estimated by a recently-reported deep learning model. A parallel screening specific to the commercially available ILs in the initial candidate database was also performed. The top-ranked three ILs, identified in both scenarios with and without limiting the commercially availability, were further evaluated in a simulated absorption-desorption process in Aspen Plus. The most promising ILs in each scenario were figured out, which vividly demonstrates the value of discovering novel ILs.
研究领域:
环境化学
·
化学工程
·
绿色溶剂
·
计算化学
·
大气污染控制
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Xiao Wang,George Q. Chen,Wei Zhang,Huining Deng
The development of reliable anion exchange membranes (AEMs) with superior antifouling properties is critical in practical applications of electrodialysis processes. For the first time, the AEMs were modified by poly (sodium 4-styrene sulfonate) (PSS) with titanium dioxide (TiO 2 ) nanoparticles using only one electrodeposition step to stabilize the nanoparticles on the membrane surface while improving their antifouling ability. Owing to the bonding between the sulfonic groups of PSS and TiO 2 , the TiO 2 nanoparticles were well dispersed in the modified layer. The deposition of PSS endowed the AEMs with a negatively charged surface, while the addition of TiO 2 nanoparticles further increased the charge density. The membrane resistance increased only marginally after 100-min of fouling experiments using sodium dodecyl benzene sulfonate (SDBS), due to the presence of TiO 2 on the modified AEMs. Ultraviolet (UV) irradiation was proven to be an effective approach in inducing good fouling reversibility of the TiO 2 -PSS modified AEMs through photocatalytic decomposition and hydrophilicity improvement.
研究领域:
膜科学
·
环境工程
·
材料化学
·
电化学
·
水处理技术
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 28
·45046
·
IF 1.86
Fenglei Liu,Shuixia Chen,Yanting Gao,Yufang Xie
A solid amine adsorbent was prepared by modifying a porous polystyrene resin (XAD-4) with chloroacetyl chloride through a Friedel–Crafts acylation reaction, followed by aminating with tetraethylenepentamine (TEPA). The adsorption behavior of CO 2 from a simulated flue gas on the solid amine adsorbent was evaluated. Factors that could determine the CO 2 adsorption performance of the adsorbents such as amine species, adsorption temperature, and moisture were investigated. The experimental results showed that the solid amine adsorbent modified with TEPA (XAD-4-TEPA), which had a longer chain, showed an amine efficiency superior to the other two amine species with shorter chains. The CO 2 adsorption capacity decreased obviously as the temperature increased because the reaction between CO 2 and amine groups was an exothermic reaction, and its adsorption amount reached 1.7 mmol/g at 10 °C in dry conditions. The existence of water could significantly increase the CO 2 adsorption amount of the adsorbent by promoting the chemical adsorption of CO 2 on XAD-4-TEPA. The adsorbent kept almost the same adsorption amount after 10 cycles of adsorption–desorption. All of these results indicated that amine-functionalized XAD-4 resin was a promising CO 2 adsorbent. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45046.
研究领域:
环境化学
·
高分子材料科学
·
气体吸附与分离
·
碳捕集技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zixiang Gao,Jun Liu,Ying Wang,Yuqiong Zhao,Guoqiang Li,Wenzhe Si,Yuefeng Liu,Guojie Zhang
Activated carbon (AC) adsorbents are extensively utilized for the adsorption and elimination of volatile organic compounds (VOCs), such as styrene, owing to their remarkable adsorption capacity and cost-effectiveness. However, the regeneration and reutilization of activated carbon face significant limitations due to incomplete cleavage of styrene and carbon accumulation during heated styrene cracking. This research focuses on the preparation of Ni-Fe bimetal-enriched adsorbent columns by successfully loading transition metals Ni and Fe onto activated carbon saturated with styrene adsorption using a simple impregnation method. A series of characterizations were conducted to unveil the formation process of active sites in the alloy phase and the mechanism behind the synergistic anti-accumulation effect of Ni and Fe on carbon deposits. Furthermore, the adsorption performance of the regenerated activated carbon for styrene was evaluated. The results revealed the formation of Fe 0.64 Ni 0.36 and Ni-Fe alloy (Kamacite) phases on the activated carbon carriers, which enhanced the cracking of styrene and exhibited superior anti-carbon accumulation properties. The styrene adsorption capacity of the synthesized bimetallic 2.5Fe-2.5Ni-900 regenerated sample reached 407.5 mg/g, approximately 1.5 times higher than that of the monometallic samples 5Fe-900 and 5Ni-900, and 1.6 times higher than that of the unmodified activated carbon RAC-900. Furthermore, kinetic studies indicated that the adsorption process of styrene by the samples followed a multilayer adsorption mechanism, predominantly governed by physical adsorption. Intra-pore diffusion was identified as the primary rate-determining step during the adsorption process. Moreover, after three regenerative adsorption cycles, the decrease in styrene adsorption capacity for the 2.5Fe-2.5Ni-900 sample was below 20 %. This study presents novel perspectives and methodologies for addressing the regeneration challenge of activated carbon saturated with styrene adsorption.
研究领域:
环境化学
·
吸附科学
·
材料再生
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大气污染控制
·
环境功能材料
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Hao Dong,Huan Tang,Xinxing Shi,Wenlan Yang,Wenjing Chen,Han Li,Yu Zhao,Zhengyong Zhang,Ming Hua
Efficient elimination of fluoride from wastewater is an urgent need for ensuring water safety. In the present study, a stable and reusable nanocomposite (NCO@PAE) was synthesized by impregnating nanosized cerium oxides (NCO) inside a porous polystyrene anion exchanger (PAE) host for efficient fluoride removal from wastewater. The newly fabricated NCO@PAE exhibited excellent resistance to acid and alkali environment, allowing it to be utilized in a wide pH range (2–12). Fluoride uptake onto NCO@PAE was a pH-dependent process, which could reach the maximum capacity at pH 3.0. Compared with its host PAE , NCO@PAE showed conspicuous adsorption affinity towards fluoride in the coexistence of other competing anions at high concentrations. Adsorption kinetics confirmed its high efficiency for achieving equilibrium within 120 min. Fixed-bed adsorption runs demonstrated that the effective processing capacity of NCO@PAE for synthetic fluoride-containing wastewater (initial fluoride 2.5 mg/L) was about ~330 BV (bed volume), while only 22 BV for the host PAE . The exhausted NCO@PAE could be effectively revived by a simple in-situ desorption method for long-term cycle operation without conspicuous capacity loss. All the results indicated that NCO@PAE is a reliable and promising adsorbent for water defluoridation.
研究领域:
环境科学
·
水处理技术
·
材料科学
·
吸附化学
·
环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 25
·
IF 1.768
Xiao-Hui Liu,Fei-Jun Zhang,Hui-Na Li,Xiao-Hui Hu,Wen-Li Di,Shuang Zhao
A facile, safe, and inexpensive reducing agent, sodium hypophosphite (NaH 2 PO 2 ·H 2 O), has been successfully used to perform ambient temperature living radical polymerizations of methyl methacrylate (MMA) and styrene (St). The rapid radical polymerizations were readily obtained at 25°C, i.e., MMA reached a conversion of ca 90% after 2.5 h, and St reached a conversion of ca 80% after 40 h. The polymerizations of MMA and St exhibited excellent living/controlled nature, as evidenced by pseudo first-order kinetics of polymerization, linear evolution of molecular weights with increasing monomer conversions, and narrow molecular weight distributions. The various experimental parameters—ligand, solvent, and molar ratio of NaH 2 PO 2 ·H 2 O to CuSO 4 ·5H 2 O—were varied to improve the control of polymerization, molecular weight, and molecular weight distribution. 1 H NMR analyses and chain-extension reactions confirm the high chain-end functionality of the resultant poly(methyl methacrylate) and polystyrene. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42123.
研究领域:
高分子化学
·
聚合反应工程
·
功能高分子材料
·
可控/活性聚合
·
绿色合成方法
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 48
·32903-32909
·
IF 4.449
Fan Zhang,Jun Song,Ming Chen,Junchen Liu,Yuying Hao,Yuncai Wang,Junle Qu,Pengju Zeng
Organic–inorganic metal halide perovskites have led to remarkable advancements in emerging photovoltaics. The rapid increase in the power conversion efficiency (PCE) of PSCs has been mainly achieved by improving perovskite morphology and crystallinity. Herein, we report a simple and effective means to improve perovskite grain sizes using a porous hole transport layer (i.e., PEDOT:PSS in this work). We used polystyrene nanospheres as a sacrificial template to fabricate the porous-PEDOT:PSS. The growth of the CH3NH3PbI3 perovskite film on the porous-PEDOT:PSS substrate yields a dramatic improvement in crystallinity and an enhancement in perovskite grain sizes. When the porous structure was applied as a hole transport layer in PSCs with planar heterojunction structures, the efficiency was significantly enhanced from 15.33% for the planar device to 17.32%. This simple method for enhancing perovskite morphology and crystallinity paves the way for its application to other device architectures for enhanced photovoltaic performance.
研究领域:
材料科学
·
光伏技术
·
纳米结构调控
·
能源材料
·
薄膜制备
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 8
·953-959
·
IF 1.757
Shuting Wang,Lan Cen,Qihao Wu
Maleated glycidyl 3-pentadecenyl phenyl ether with styrene (MGS) was synthesized from glycidyl 3-pentadecenyl phenyl ether (GPPE), maleic anhydride (MAH) and styrene (St) in the presence of AIBN initiator at 80°C, and then the resultant MGS was applied as a compatibilizer to prepare SBR/silica composites. Meanwhile, the commercial compatibilizer bis-(triethoxysilylpropyl) tetrasulfide (named Si69) added into composite was also prepared for comparison purpose. The synthetic MGS structure was characterized by GPC and FTIR, and SBR/silica compounds with different compatibilizer were analyzed using RPA, DMA and so on. The results showed that M̄n and M̄w of MGS were 19,538 g/mol and 23,790 g/mol, respectively. The curing time of compounds with MGS increased, whereas the maximum and minimum torques decreased. The addition of MGS decreased Payne effect of SBR/silica compounds, which implied an improvement of silica dispersion in the compounds. Bound rubber content of compound with MGS was about 1.7 times higher than the absence and 1.5 times higher than that with Si69. The tensile strength of the composites was improved by increasing compatibilizer loading, and the optimum value was observed at 6 phr of MGS. Meanwhile the use of MGS can improve the anti-aging property of composite. According to DMA, the tanδ value at 0°C of composite with MGS was higher than composite without compatibilizer suggesting that MGS can improve the wet skid resistance of composite. The SEM analysis revealed that introduction of MGS enhanced the compatibility between SBR and silica. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
高分子化学
·
橡胶复合材料
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材料界面科学
·
功能高分子
·
聚合物改性
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 128
·105747-105752
·
IF 3.84
Yuanyuan Zheng,Xiaoming Zhang,Yi Yao,Xiaohong Chen,Qihua Yang
Ultra-small Au nanoparticles (<2 nm) supported on hollow silica nanospheres were successfully fabricated with the aid of chemical modification (–SH groups) or through simple immersion method, leading to supported catalysts Au/SH-HNS and Au/HNS. The resulting solid catalysts showed good thermal stability and the small particle sizes could be remained even at high temperature of 350 °C. Such catalysts were catalytically active in the oxidation of styrene using O2 as oxidant under 1 atm pressure. The catalytic results showed that the activity strongly depends on the Au loading amount, and the loading of 4–5 wt% led to the highest activity. Significant rate enhancement was observed with gold nanoparticles supported on pure silica in comparison with thiol modified silica nanospheres, suggesting the negative effects of thiol groups. The solid catalyst could be reused at least 8 reaction cycles without significant decrease in activity and selectivity. This study not only supplies an active, recoverable catalyst for the green transformation of styrene, but also demonstrates that the hollow silica nanosphere material has a superior ability in stabilizing metal nanoparticles against growth.
研究领域:
纳米催化
·
材料化学
·
绿色化学
·
有机氧化反应
·
多相催化
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Li Wang,Ya Liu,Hongsheng Lu,Zhiyu Huang
Plastic waste has caused severe environmental problems. Some additives in plastics, like organophosphates, enter the environment with plastic waste, causing significant harm to plants and creatures. However, the primary method of recycling phosphorus-containing plastic, especially polycarbonate and acrylonitrile-butadiene-styrene copolymer (PC/ABS), is a mechanical method, which not only does not effectively separate plastics and organophosphates but also tends to cause polymer degradation during recycling. In order to overcome these problems, we proposed an efficient and sustainable approach to recycle of phosphorus-containing plastic. In this method, N, N -dimethylcyclohexylamine (DMCHA), a switchable hydrophilicity solvent (SHS), was used to react with and extract organophosphates in plastic, achieving the goal of complete separation of plastic and organophosphates. PC/ABS can be recovered by precipitation. Dissolved organophosphates can also be easily recovered due to the switching characteristics of SHS. Both of recovered materials were of high purity and were close to virgin materials. This technique is an easy and efficient approach to separate plastic and organophosphates, which has excellent application prospects in recycling phosphorus-containing plastic.
研究领域:
环境科学
·
高分子化学
·
绿色化工
·
资源循环利用
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Badusha Mohamad Ali,Hao Zhang,Lei Wang,Ziqi Yu,Chenbing He,Tangxin Zhang,Kaisen Jiang,Weiheng Liu,Jiayuan Wang,Lingyu Zhu,Jianli Wang
The production of biodiesel from renewable feedstocks through energy-efficient processes remains a pressing challenge. Pickering emulsions, stabilized by solid particles, have emerged as a promising approach to enhance biodiesel production. This study presents the synthesis of dumbbell-shaped Janus polymer nanoparticles (DS-JPNs) functionalized with organic amine bases, which serves as Pickering interfacial catalysts (PICs) for transesterification reaction. The anisotropic morphology and amphiphilic nature of DS-JPNs promote stable adsorption at the soybean oil-methanol interface, leading to reduced interfacial tension, smaller droplet formation, and the generation of thermodynamically stable emulsions. This microreactor system prominently enhances the interfacial area and mass transfer efficiency, thereby accelerating the transesterification efficiency. Consequently, the DS-JPN-TMA catalyst achieved a biodiesel yield of 85.4 % under static conditions, a 2.6-fold increase compared to the spherical PS-TMA counterpart (34.2 %). Among the examined Janus organic base catalysts, DS-JPN-TBD demonstrated the highest catalytic performance (TOF 12.51 h −1 ), attaining a biodiesel yield of 96.7 %, attributable to the strong basicity of its bicyclic guanidine moieties. Furthermore, DS-JPN-TBD retained 94.2 % of its catalytic activity after five reaction cycles, evidencing excellent reusability and durability. This study underscores DS-JPN-TBD as an innovative, energy-efficient, and sustainable solution for biodiesel production and proposes a scalable strategy for green energy applications.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）