Macromolecular Reaction Engineering最新文献_第3页

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 1.5 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

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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}

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Polymer Versus Polymerization Fouling: Basic Deposition Mechanisms During Emulsion Polymerization by the Example of a Vinyl Acetate and Versa 10 Copolymer 聚合物与聚合污垢：以醋酸乙烯酯和 Versa® 10 共聚物为例：乳液聚合过程中的基本沉积机制

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-01-09 DOI: 10.1002/mren.202300057

Annika Klinkert, Zoe Friedrich, Elisabeth Glatt, Wolfgang Augustin, Stephan Scholl

{"title":"Polymer Versus Polymerization Fouling: Basic Deposition Mechanisms During Emulsion Polymerization by the Example of a Vinyl Acetate and Versa 10 Copolymer","authors":"Annika Klinkert, Zoe Friedrich, Elisabeth Glatt, Wolfgang Augustin, Stephan Scholl","doi":"10.1002/mren.202300057","DOIUrl":"10.1002/mren.202300057","url":null,"abstract":"The deposition process during emulsion polymerization can be classified as both particulate and reaction fouling, but a deeper understanding of the deposition mechanism, especially in combination with the polymerization process, is lacking. Here, a more in-depth understanding of the deposition mechanism is sought by investigating the fouling formation of a Vinyl acetate and Versa 10 copolymer on a heated stainless steel surface during emulsion polymerization. Its deposition behavior is also compared with the behavior of an already reacted polymer. All possible influencing factors are investigated separately, and the fouling is quantified by the mass based fouling resistance and the fouling layer composition. The fouling rates of both experimental approaches (ongoing reaction versus already reacted polymer) are used to determine the fraction of reaction fouling along the reaction pathway. The solids content and the driving temperature difference are identified as the main factors influencing fouling formation. The deposited material is composed of latex particles and emulsifier with particle size and number depending on the respective equilibrium composition of the fluid phase. The reaction fouling rate is correlated with the proportion of free initiator radicals and the amount of dissolved monomer in the aqueous phase.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202300057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139411984","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}

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Mechanical, Rheological, and Heat Seal Properties of 1-Octene Grafted Low Density Polyethylene Films 1 辛烯接枝低密度聚乙烯薄膜的机械、流变和热封性能

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-12-26 DOI: 10.1002/mren.202300060

Fatemeh Salmani, Rasoul Shemshadi, Issa Mousazadeh Moghaddampour, Shervin Ahmadi, Ghasem Naderi, Razi Sahraeian, Seyed Mohamad Reza Paran

{"title":"Mechanical, Rheological, and Heat Seal Properties of 1-Octene Grafted Low Density Polyethylene Films","authors":"Fatemeh Salmani, Rasoul Shemshadi, Issa Mousazadeh Moghaddampour, Shervin Ahmadi, Ghasem Naderi, Razi Sahraeian, Seyed Mohamad Reza Paran","doi":"10.1002/mren.202300060","DOIUrl":"10.1002/mren.202300060","url":null,"abstract":"Heat seal and mechanical properties of 1-octene grafted low density polyethylene films containing various concentrations of Dicumyl peroxide as the initiator and 1-octene grafting agent is investigated through using experimental measurements. The results of differential scanning calorimeter (DSC) measurements revealed that the melting temperature shifts to higher values and the peak of the DSC curve becomes wider with the increase of 1-octene concentrations. Thermogravimetric analysis (TGA) revealed a higher thermal stability up to 20 °C for 1-octene grafted PE compared with neat LDPE alloy. The results of stress–strain measurements revealed that the 1-octene grafted PE alloys has higher tensile strength in comparison with neat PE alloy and samples containing only DCP initiator. The results of heat seal analysis indicated that both DCP initiator and 1-octene tended to offer a moderate increase peel strength of PE alloy. DMTA measurements for various grafted PE alloys show a higher damping factor in comparison with neat LDPE alloy. Rheological measurements indicated a higher storage modulus up to 25% and higher complex viscosity for grafted PE samples containing 1-octene comonomer.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139056498","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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Investigating The Kinetics of Anionic Polymerization of Butadiene in Presence of 1,2-diethoxypropane Using Online Near-Infrared Spectroscopy 利用在线近红外光谱仪研究丁二烯在 1,2-二乙氧基丙烷存在下的阴离子聚合动力学

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Macromolecular Reaction Engineering Pub Date : 2023-12-20 DOI: 10.1002/mren.202300051

Luis Rodriguez-Guadarrama

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Front Cover: Macromol. React. Eng. 6/2023 封面：Macromol.React.Eng.6/2023

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Macromolecular Reaction Engineering Pub Date : 2023-12-14 DOI: 10.1002/mren.202370012

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