Macromolecular Reaction Engineering最新文献_第10页

Polymerization of N-Butyl Vinyl Ether Catalyzed by Iron-Containing Imidazolium-Based Ionic Liquid 含铁咪唑基离子液体催化N -丁基乙烯基醚聚合

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-24 DOI: 10.1002/mren.202300002

Tamara Agner, Amadeo Zimermann, Fabricio Machado, Brenno A. D. Neto, Pedro H. H. de Araújo, Claudia Sayer

{"title":"Polymerization of N-Butyl Vinyl Ether Catalyzed by Iron-Containing Imidazolium-Based Ionic Liquid","authors":"Tamara Agner, Amadeo Zimermann, Fabricio Machado, Brenno A. D. Neto, Pedro H. H. de Araújo, Claudia Sayer","doi":"10.1002/mren.202300002","DOIUrl":"10.1002/mren.202300002","url":null,"abstract":"The iron-containing imidazolium-based ionic liquids (ILs) 1-n-butyl-3-methylimidazolium heptachlorodiferrate (BMI.Fe2Cl7) and 1-n-butyl-3-methylimidazolium tetrachloroferrate (BMI.FeCl4) are applied as catalysts in the homogeneous polymerization of n-butyl vinyl ether. Both solventless conditions as well as using different organic solvents, catalyst concentrations, temperatures, and reaction times are tested to assess the polymerization conditions that lead to the highest molecular weights of poly(n-butyl vinyl ether). The Lewis acidic IL BMI.Fe2Cl7 proves to be highly efficient, even at low catalyst concentrations. In bulk polymerization, polymers with 142 kg mol−1 are obtained using a 1:10000 molar ratio of catalyst to monomer. In solution polymerization, the monomer consumption is also rapid and the molecular weight of the polymer is related to the catalyst concentration used. These results indicate the potential of this catalyst for industrial applications. In contrast with the acidic IL, the neutral iron-containing imidazolium-based IL BMI.FeCl4 does not show any catalytic activity.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41955433","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

Modeling of the Copolymerization of Propylene with 1-Hexene to Predict the Copolymer Molecular Weight and Composition 丙烯与1 -己烯共聚的建模，以预测共聚物的分子量和组成

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-20 DOI: 10.1002/mren.202200078

Franco Herrero, Adriana Brandolin, Claudia Sarmoria, Mariano Asteasuain

引用次数: 0

Macromol. React. Eng. 1/2023 Macromol。反应工程1/2023

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-17 DOI: 10.1002/mren.202370001

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Masthead: Macromol. React. Eng. 1/2023 刊头：Macromol。反应工程1/2023

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-17 DOI: 10.1002/mren.202370002

引用次数: 0

Optimization of Grade Transitions in Bulk Poly(propylene) Polymerizations 本体聚（丙烯）聚合中等级转换的优化

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-10 DOI: 10.1002/mren.202300001

Jonildo S. Silva, Príamo A. Melo, José Carlos Pinto

{"title":"Optimization of Grade Transitions in Bulk Poly(propylene) Polymerizations","authors":"Jonildo S. Silva, Príamo A. Melo, José Carlos Pinto","doi":"10.1002/mren.202300001","DOIUrl":"10.1002/mren.202300001","url":null,"abstract":"In the present paper, a dynamic optimization problem regarding grade transitions in bulk poly(propylene) polymerization processes is formulated and solved for the first time. Initially, a detailed dynamic process model is presented and implemented, comprising mass and energy balances, some of the polymer properties (such as the melting flow index and the xylene solubles) and regulatory control loops. Additionally, the effects of cocatalyst and electron donor on the propagation rate constant are taken into account. Then, the dynamic optimization problem is formulated and an evolutionary algorithm is used to solve the resulting nonlinear programming problem. It is shown that there is significant coupling among the manipulated variables and the controlled performance and polymer property variables, which adds complexity to the grade transition problem and demands the simultaneous manipulation of multiple variables during transitions. Despite the inherent open-loop unstable nature of the analyzed process, it is shown that smooth grade transition trajectories can be accomplished through proper adjustment of the objective function weights. Finally, it is shown that the obtained optimum trajectories can significantly diminish the transition time, which can be of paramount importance for the plant economics.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48002159","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: 1

Validation of an Extended Kinetic Model of Free-Radical N-Vinylpyrrolidone Polymerization 自由基N-乙烯基吡咯烷酮聚合扩展动力学模型的验证

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-01-29 DOI: 10.1002/mren.202200075

Stefan Welzel, Jule Burmeister, Oliver Höppchen, Ulrich Nieken

引用次数: 0

Influence of Synthesis Parameters on the Magnetic, Thermal, and Morphological Properties of Poly(Glycidyl Methacrylate-co-Divinylbenzene)/Magnetite 合成参数对聚（甲基丙烯酸缩水甘油酯-共聚二乙烯基苯）/磁铁矿磁、热和形态性质的影响

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-01-28 DOI: 10.1002/mren.202200073

Carla Nascimento Queiroz, Henrique Almeida Cunha, Manoel Ribeiro da Silva, Márcia Gomes de Oliveira, Jacira Aparecida Castanharo, Ivana Lourenço de Mello Ferreira, Marcos Antonio da Silva Costa

{"title":"Influence of Synthesis Parameters on the Magnetic, Thermal, and Morphological Properties of Poly(Glycidyl Methacrylate-co-Divinylbenzene)/Magnetite","authors":"Carla Nascimento Queiroz, Henrique Almeida Cunha, Manoel Ribeiro da Silva, Márcia Gomes de Oliveira, Jacira Aparecida Castanharo, Ivana Lourenço de Mello Ferreira, Marcos Antonio da Silva Costa","doi":"10.1002/mren.202200073","DOIUrl":"10.1002/mren.202200073","url":null,"abstract":"In this work, polymeric microspheres based on glycidyl methacrylate and divinylbenzene with magnetic properties are synthesized by the suspension polymerization technique. To obtain magnetic properties, magnetite particles modified by oleic acid are synthesized in the laboratory. The effects of stirring speed, concentration of magnetite added, and concentration of stabilizer on the particles’ properties are studied. The magnetic microspheres are characterized according their morphology, magnetite incorporation, and magnetic and thermal properties. The incorporation of iron particles is mainly affected by stirring speed during synthesis and the amount of added magnetic material. The saturation magnetization of the microspheres is affected by the content of incorporated magnetic material. The modification with oleic acid is important for incorporation of the magnetic material in the copolymer matrix. Polymeric particles with superparamagnetic behavior are obtained with spherical morphology and saturation magnetization of 7.11 (emu g−1) when employing a monomer molar ratio of 50/50, 1% poly(vinyl alcohol), 20% magnetite particles modified by oleic acid, and stirring speed of 500 rpm.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48728896","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

Influence of Benzoyl Peroxide and Divinylbenzene Concentrations on the Properties of Poly(glycidyl methacrylate-co-divinylbenzene) Magnetic Microspheres 过氧化苯甲酰和二乙烯基苯浓度对聚甲基丙烯酸缩水甘油酯- co -二乙烯基苯磁性微球性能的影响

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-01-20 DOI: 10.1002/mren.202200070

Washington José Fernandes Formiga, Manoel Ribeiro da Silva, Henrique Almeida Cunha, Jacira Aparecida Castanharo, Ivana Lourenço de Mello de Ferreira, Marcos Antonio da Silva Costa

引用次数: 0

Modeling and Parameter Estimation for Gas-Phase Polyethylene Product Properties Using Dynamic and Steady-State Data 使用动态和稳态数据的气相聚乙烯产品性能建模和参数估计

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-01-15 DOI: 10.1002/mren.202200067

Lauren A. Gibson, Yan Jiang, Timothy Boller, Hsu Chiang, Kimberley B. McAuley

{"title":"Modeling and Parameter Estimation for Gas-Phase Polyethylene Product Properties Using Dynamic and Steady-State Data","authors":"Lauren A. Gibson, Yan Jiang, Timothy Boller, Hsu Chiang, Kimberley B. McAuley","doi":"10.1002/mren.202200067","DOIUrl":"10.1002/mren.202200067","url":null,"abstract":"Models are developed for gas-phase ethylene/1-hexene copolymerization using a 3-site hafnocene catalyst. The models accurately predict joint molecular weight distribution and copolymer composition data for 15 semibatch lab-scale copolymerization runs and 6 steady-state pilot-plant copolymerization runs, respectively. Kinetic rate constants and activation energies, which are common to both models, are estimated for the three types of active sites for each reaction in the kinetic scheme. Using parameter subset selection and estimation techniques, it is found that 34 of the 61 parameters should be estimated from the data. Incorporating the pilot-plant data allow for estimation of two parameters, a deactivation rate constant and a β-hydride elimination activation energy, that are not estimable using the lab-scale data alone. At the 95% confidence level, 25 of the 34 parameters are significantly different than zero, which is more than the 19 significant parameter estimates obtained from the lab-scale data alone. Good fits to the data are obtained, as are reliable predictions for a validation run not used in parameter estimation.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43584301","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

Functionalization of Polymer Networks to Target Trans-Resveratrol in Winemaking Residues Supported by Statistical Design of Experiments 基于统计设计的葡萄酒残留物中反式白藜芦醇聚合物网络功能化研究

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-01-07 DOI: 10.1002/mren.202200076

Amir Bzainia, Rolando C. S. Dias, Mário Rui P. F. N. Costa

{"title":"Functionalization of Polymer Networks to Target Trans-Resveratrol in Winemaking Residues Supported by Statistical Design of Experiments","authors":"Amir Bzainia, Rolando C. S. Dias, Mário Rui P. F. N. Costa","doi":"10.1002/mren.202200076","DOIUrl":"10.1002/mren.202200076","url":null,"abstract":"The present work aims to produce functionalized polymer networks to target the bioactive molecule trans-resveratrol found in winemaking residues, specifically at grape stems. The synergistic choice of photoinitiation, polymerization composition, and molecular imprinting approach allows the functionalization of these materials. Experimental design is applied to methodically perform the syntheses. The amount of crosslinker, the total monomer's concentration, and the ratio of trans-resveratrol to the functional monomer 4-vinylpyridine (4VP) are the factors selected for this experimental design. The binding capacities and the selectivity of the synthesized materials are assessed through sorption experiments in acetonitrile and hydroalcoholic media. Consequently, a multivariate linear regression analysis leads to describe the uptake of trans-resveratrol by the materials in both media. The crosslinker content and the ratio of trans-resveratrol to 4VP are found to be impactful parameters while designing such materials. These studies allow the identification of working conditions for sorption/desorption processes combining a high retention capability of the adsorbents with selectivity. Furthermore, four materials are selected to enrich trans-resveratrol from grape stems extracts in a continuous process of solid-phase extraction. The results show that the functionalized materials are able to enrich 12-fold the content of trans-resveratrol in some fractions demonstrating the interest of such polymers.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202200076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47238157","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: 1