Macromolecular Reaction Engineering最新文献_第5页

Masthead: Macromol. React. Eng. 2/2024 刊头：Macromol.React.2/2024

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-04-18 DOI: 10.1002/mren.202470004

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Thermal Degradation Kinetic Study of Expanded Perlite-Modified Butadiene Rubber Composites 膨胀珍珠岩改性丁二烯橡胶复合材料的热降解动力学研究

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-04-12 DOI: 10.1002/mren.202400005

Nada Edres, Irada Buniyatzadeh, Solmaz Aliyeva, Sinan Mehmet Turp, Rasim Alosmanov

{"title":"Thermal Degradation Kinetic Study of Expanded Perlite-Modified Butadiene Rubber Composites","authors":"Nada Edres, Irada Buniyatzadeh, Solmaz Aliyeva, Sinan Mehmet Turp, Rasim Alosmanov","doi":"10.1002/mren.202400005","DOIUrl":"10.1002/mren.202400005","url":null,"abstract":"Mineral–rubber composites based on phosphorylated butadiene rubber (PhBR), including pure expanded perlite (EP) and modified phosphorylated expanded perlite (PhEP) as fillers, are developed. The process involves forming PhBR and its composites—EP/PhBR and PhEP/PhBR—through the oxidative chlorophosphorylation (OxCh) reaction. An in-depth comparative analysis is conducted on the thermal destruction of the PhBR matrix and the EP/PhBR, and PhEP/PhBR composites. The thermogravimetric (TG)/differential thermogravimetry (DTG) analyses reveal three stages of thermal degradation for the PhBR matrix and both composites, highlighting the notable effects of EP and PhEP in the second and third stages of the degradation process. In comparison, the PhEP/PhBR composite exhibits reduced weight loss, the highest integral procedural decomposition temperature (IPDT) value, and a lower Tmax on the DTG curve, compared with the EP/PhBR composite and the PhBR matrix. The mechanism of the thermal destruction reaction and the kinetic parameters Ea and A are calculated using the model-fitting Coats–Redfern method.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Highly Transparent and Flexible Multiwalled Carbon Nanotube–Polyimide Films with Enhanced Electrical Performance as Promising Electrodes 具有增强电性能的高透明柔性多壁碳纳米管-聚酰亚胺薄膜有望成为电极

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-04-10 DOI: 10.1002/mren.202400001

Yoonju Oh, Seunghyun Song, Man Li, Joonho Bae

{"title":"Highly Transparent and Flexible Multiwalled Carbon Nanotube–Polyimide Films with Enhanced Electrical Performance as Promising Electrodes","authors":"Yoonju Oh, Seunghyun Song, Man Li, Joonho Bae","doi":"10.1002/mren.202400001","DOIUrl":"10.1002/mren.202400001","url":null,"abstract":"Transparent and light films with high electrical conductivity are preferred for flexible electronic applications. Here, a film exhibiting high transparency, electrical conductivity, and flexibility is produced using a polyimide (PI) substrate and multiwalled carbon nanotubes (MWCNTs) through spray coating. Cost-effective MWCNTs are used instead of other electrically conductive materials, including silver nanowire ink, single-walled carbon nanotubes (SWCNTs), and other carbon materials. The average sheet resistance of the prepared MWCNT–PI film is 520.2 Ω □−1 (infinite for the bare PI film), which is lower than the sheet resistances of the SWCNT–PI film reported by another group. This can be attributed to the increase in electrical conductivity of the highly transparent PI film due to the use of MWCNTs. The transparency of the MWCNT–PI film is 71.834% at 550 nm. When MWCNTs and PI are combined, MWCNTs protrude from the surface of the PI film, creating networks and increasing electrical conductivity. Atomic force microscopy analysis reveals that MWCNT networks form on the surface of the MWCNT–PI film. This study suggests the possibility that MWCNTs can also be used as carbon materials for flexible and highly transparent films.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of Performance and Deactivation Resistance of Catalysts in the Pyrolysis of Polyethylene and Post-Consumer Polyolefin Waste 评估催化剂在热解聚乙烯和消费后聚烯烃废料中的性能和抗失活能力

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-03-20 DOI: 10.1002/mren.202300061

Katiane de Jesus Mesquita, José Carlos Pinto, Henrique Poltronieri Pacheco

{"title":"Assessment of Performance and Deactivation Resistance of Catalysts in the Pyrolysis of Polyethylene and Post-Consumer Polyolefin Waste","authors":"Katiane de Jesus Mesquita, José Carlos Pinto, Henrique Poltronieri Pacheco","doi":"10.1002/mren.202300061","DOIUrl":"10.1002/mren.202300061","url":null,"abstract":"In the present work, the catalyst performances of USY and REY zeolites and MgO, ZnO, and MgxAlOy oxides are investigated in the pyrolysis of virgin high-density polyethylene (HDPE) and of post-consumer polyolefin waste. The influence of operation parameters and catalyst deactivation resistance over four reaction cycles are evaluated. The results indicate that basic oxides do not show relevant cracking activity, so that the only identified effect for these catalysts is the production of liquid products with higher contents of paraffins when compared to thermal pyrolysis. Among the evaluated oxides, MgxAlOy is the most active and resistant to deactivation. The zeolites promote cracking and secondary reactions of isomerization, cyclization, and aromatization. Particularly, USY promotes the production of higher-quality oils and shows higher deactivation resistance, when compared to REY. Additionally, a significant loss of catalyst activity is identified in reactions conducted with post-consumer polyolefin wastes. However, increase in rates of coke formation and the presence of contaminants (such as halogens and metals) are not detected in the catalysts after the reactions.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140170920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dispersion Polymerization of N-Vinyl-2-Pyrrolidone in Supercritical Carbon Dioxide in the Presence of Thiol-Terminated Poly(vinyl acetate-co-vinyl propionate) N-乙烯基-2-吡咯烷酮在超临界二氧化碳中与硫醇端聚（醋酸乙烯酯-丙酸乙烯酯）的分散聚合反应

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-03-08 DOI: 10.1002/mren.202300063

Shoucun Zhang, Shengyan Wang, Wenli Wu, Jinlong Wu, Jianghua Du

{"title":"Dispersion Polymerization of N-Vinyl-2-Pyrrolidone in Supercritical Carbon Dioxide in the Presence of Thiol-Terminated Poly(vinyl acetate-co-vinyl propionate)","authors":"Shoucun Zhang, Shengyan Wang, Wenli Wu, Jinlong Wu, Jianghua Du","doi":"10.1002/mren.202300063","DOIUrl":"10.1002/mren.202300063","url":null,"abstract":"Liquid carbon dioxide (LCO2) or supercritical carbon dioxide (ScCO2) can be used as an important solvent medium for preparing polymer particles through dispersion polymerization. However, based on the weak solvent characteristics of CO2, the development of stabilizers used in dispersion polymerization has always been an important challenge. These stabilizers are progressing toward the low-cost, pollution-free, and simple synthesis routes, et al. In this research, pentaerythritol tetra (3-mercaptopropionate) (PTMP) is used to control the homopolymerization or copolymerization of vinyl acetate (VAc)/vinyl propionate (VPr), the homopolymers or copolymers with thiol group are synthesized by the one-pot method. These homopolymers or copolymers are used as the stabilizers to stabilize the dispersion polymerization of N-vinyl-2-pyrrolidone (NVP) in ScCO2. The results show that the structural unit proportion of the stabilizers, the concentration of stabilizers or 2, 2´-azobis(isobutyronitrile) (AIBN), and the time interval for dispersion polymerization have significant impacts on the conversion percentage of NVP and the molecular weight of polymers. The maximum conversion percentage of NVP can get to 95%, and the molecular weight of poly(N-vinyl-2-pyrrolidone)(PNVP) can reach 22.3 kPa. SEM analysis indicates that the PNVP obtained has regular spherical characteristics.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Mass Transfer in Emulsion Polymerization: High Solids Content Latex and Mixing Effects 乳液聚合中的传质：高固体含量胶乳和混合效应

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-02-18 DOI: 10.1002/mren.202300064

Mariana Guadalupe TORRES ALADRO, Estela Kamile Gelinski, Nida Sheibat-Othman, Timothy F. L. McKenna

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Masthead: Macromol. React. Eng. 1/2024 刊头：Macromol.React.Eng.1/2024

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-02-15 DOI: 10.1002/mren.202470002

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Front Cover: Macromol. React. Eng. 1/2024 封面：Macromol.React.Eng.1/2024

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-02-15 DOI: 10.1002/mren.202470001

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Digital Twin for the SBR Cold Emulsion Copolymerization Process 苯乙烯/1,3-丁二烯橡胶 (SBR) 冷乳液共聚工艺的数字双胞胎

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-02-02 DOI: 10.1002/mren.202300055

Roymel R. Carpio, Thiago Feital, Maurício M. Câmara, Flávio Gerhardt, Leo Lincoln Oliveira, José Carlos Pinto

{"title":"Digital Twin for the SBR Cold Emulsion Copolymerization Process","authors":"Roymel R. Carpio, Thiago Feital, Maurício M. Câmara, Flávio Gerhardt, Leo Lincoln Oliveira, José Carlos Pinto","doi":"10.1002/mren.202300055","DOIUrl":"10.1002/mren.202300055","url":null,"abstract":"Development of accurate and robust dynamic models for the description of emulsion copolymerization processes is fundamental for the implementation of monitoring, advanced control, and optimization strategies. There are several studies on the dynamic modeling of styrene/1,3-butadiene rubber (SBR) emulsion copolymerization, but most of them focus on hot conditions or only one semi-batch reactor, as in the case of cold conditions. For this reason, the present study focuses on the dynamic modeling of SBR cold emulsion copolymerization processes considering a train of 15 continuous stirred tank reactors, as in many real industrial sites. The developed dynamic model is implemented by using the digital twin (DT) concept, which involves the online reading of process variables and an adaptive strategy for online tuning of some of the model parameters, being also sensitive to the effect of real-time changes on the number of reactors in the train, a subject that has been overlooked previously, but which is important at the plant site. The practical application of the DT for monitoring a real industrial process illustrates the robustness and accuracy of the developed tool, making it useful for opportune detection of process anomalies and opening the way for future advanced control strategies.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139870476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Impact of Ionic Strength (Sodium Chloride Concentration) on Homopolymerization and Copolymerization Kinetics of Acrylamide and 2-Acrylamido-2-Methylpropane Sulfonic Acid 离子强度（氯化钠浓度）对丙烯酰胺和 2-丙烯酰胺基-2-甲基丙烷磺酸的均聚和共聚动力学的影响

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-01-25 DOI: 10.1002/mren.202300058

Ian D. Conrod, Baris Topcuoglu, Alexander Penlidis, Alison J. Scott

{"title":"Impact of Ionic Strength (Sodium Chloride Concentration) on Homopolymerization and Copolymerization Kinetics of Acrylamide and 2-Acrylamido-2-Methylpropane Sulfonic Acid","authors":"Ian D. Conrod, Baris Topcuoglu, Alexander Penlidis, Alison J. Scott","doi":"10.1002/mren.202300058","DOIUrl":"10.1002/mren.202300058","url":null,"abstract":"Anionic polyelectrolytes can be used for a variety of applications, including flocculation and enhanced oil recovery. While it is widely recognized that polyelectrolyte synthesis is impacted by the pre-polymer formulation and polymerization conditions, the specific relationships between these factors and the subsequent polymer properties are not well understood. Therefore, the current work intends to improve understanding of ionic strength (IS) effects during the copolymerization of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and acrylamide (AAm). The aims of the study are i) to use in situ H1 NMR to study copolymerization kinetics, and ii) to determine how increasing IS impacts copolymerization kinetics (and, by extension copolymer microstructure). It is found that altering IS prior to copolymerization has significant impacts on the reactivity ratios, and therefore impacts the microstructure through multiple mechanisms. Increasing IS causes a crowding effect, where the propagating chain develops a random coil conformation and causes steric hindrance of the large AMPS monomer, decreasing the likelihood of AMPS propagation. When the IS is increased further, the ionic shielding effect is more impactful, increasing the likelihood of AMPS propagation. Ultimately, this work will make it possible to manipulate IS to synthesize AMPS/AAm copolymers with specific desirable properties for target applications.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202300058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0