Macromolecular Reaction Engineering最新文献_第8页

Low Salinity Water–Polymer Flooding in Carbonate Oil Reservoirs: A Critical Review 碳酸盐岩油藏低矿化度水聚合物驱研究进展

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-11 DOI: 10.1002/mren.202300007

Fabio Pedro Nascimento, Verônica de Jesus Pereira, Ladislane dos Santos Bastos, Gloria Meyberg Nunes Costa, Silvio Alexandre Beisl Vieira de Melo

引用次数: 2

Copolymerization of ω-Alkenyltrimethylsilane/Propylene with Heterogeneous Ziegler-Natta Catalyst: How Dose Alkenyl Length Affect Comonomer Incorporation? ω -烯基三甲基硅烷/丙烯与异相Ziegler - Natta催化剂的共聚:烯基长度如何影响共聚单体的掺入?

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-26 DOI: 10.1002/mren.202300004

Fengtao Chen, Zhijian Zhang, Yawei Qin, Jin-Yong Dong

{"title":"Copolymerization of ω-Alkenyltrimethylsilane/Propylene with Heterogeneous Ziegler-Natta Catalyst: How Dose Alkenyl Length Affect Comonomer Incorporation?","authors":"Fengtao Chen, Zhijian Zhang, Yawei Qin, Jin-Yong Dong","doi":"10.1002/mren.202300004","DOIUrl":"10.1002/mren.202300004","url":null,"abstract":"Three ω-alkenyltrimethylsilanes of different alkenyl moieties, i.e., 3-butenyltrimethylsilane, 5-hexenyltrimethylsilane, and 7-octenyltrimethylsilane, are copolymerized with propylene over a heterogeneous Ziegler-Natta catalyst. The experimental results reveal that, at odds with what the molecular volumes will foretell, 5-hexenyltrimethylsilane top the three ω-alkenyltrimethylsilanes in incorporation rate into PP while 3-butenyltrimethylsilane becomes the most sluggish of the three. This comonomer incorporation rate order is in line with that of ω-alkenylmethyldichlorosilanes in copolymerization with propylene-synthesizing long-chain-branched PP (LCB-PP), pointing to a peculiar alkenyl length effect on comonomer incorporation rate for these comonomers. DFT simulation is then applied to seek energetic basis in coordination-insertion for such an effect. It is revealed that complexation abilities of the three ω-alkenyltrimethylsilanes decrease in the following order: 3-butenyltrimethylsilane > 5-hexenyltrimethylsilane > 7-octenyltrimethylsilane, in line with their molecular sizes. However, the insertion energy barriers increase in the order of: 5-hexenyltrimethylsilane < 7-octenyltrimethylsilane < 3-butenyltrimethylsilane. The repulsive interaction between the bulky trimethylsilane functionality of ω-alkenyltrimethylsilanes and growing PP chain is found to contribute significantly to the insertion energy barrier, which grows disproportionally large with 3-butenyltrimethylsilane. The current discovery will be conducive to understanding the more complex ω-alkenylmethyldichlorosilane/propylene copolymerization that synthesizes the industrially important LCB-PP.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45678632","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

Evaluation of Hyperthermic Potential and Acute Toxicity of PLGA-PEG/Magnetite Microspheres Loaded with Oxaliplatin Using Mice as a Test System 以小鼠为实验系统评价载奥沙利铂的PLGA - PEG/磁铁矿微球的热电位和急性毒性

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-25 DOI: 10.1002/mren.202300005

Emiliane Daher Pereira, Fernando Gomes de Souza Junior, José Carlos Pinto, Sergio Thode Filho, Kaushik Pal, Alexandre dos Santos Pyrrho, Renata Cerruti da Costa, Bruno Pereira da Cunha, Fabíola da Silveira Maranhão, Thuanny Moraes de Almeida

{"title":"Evaluation of Hyperthermic Potential and Acute Toxicity of PLGA-PEG/Magnetite Microspheres Loaded with Oxaliplatin Using Mice as a Test System","authors":"Emiliane Daher Pereira, Fernando Gomes de Souza Junior, José Carlos Pinto, Sergio Thode Filho, Kaushik Pal, Alexandre dos Santos Pyrrho, Renata Cerruti da Costa, Bruno Pereira da Cunha, Fabíola da Silveira Maranhão, Thuanny Moraes de Almeida","doi":"10.1002/mren.202300005","DOIUrl":"10.1002/mren.202300005","url":null,"abstract":"Oxaliplatin and modified magnetic nanoparticles (magnetite-lysine) are inserted into microspheres of previously synthesized poly(lactic acid-co-glycolic acid-b-ethylene glycol) PLGA-PEG to evaluate the in vitro hyperthermal potential and the acute toxicity in mice. The used nanoparticles are synthesized by the coprecipitation method, using Fe II and Fe III, and modification with lysine is performed during the synthesis. The drug and the magnetic nanoparticles are inserted into the polymer beads through oil in water (O/W) emulsion. The obtained composites are then characterized by Fourier-transform infrared (FTIR), Thermogravimetric analysis (TGA), X-ray Diffraction (XRD), and submitted to magnetic hyperthermia and acute toxicity tests. The hyperthermia tests are conducted according to an experimental design. The magnetite-lysine nanoparticles reached the temperature for the desired application and are able to raise the temperature by 6 °C at the higher investigated current, time, and concentration conditions. According to the proposed statistical study, only the test time exerted significant positive influence on the observed temperature increase, although synergies between time and concentration and between current and concentration are also significant. In vivo acute toxicity tests are also conducted with swiss mice and revealed that the prepared materials and procedures can be regarded as safe and of low toxicity.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47255389","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

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

引用次数: 0

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