Macromolecular Reaction Engineering最新文献_第6页

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}

引用次数: 0

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

IF 1.5 4区工程技术

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

Luis Rodriguez-Guadarrama

引用次数: 0

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

IF 1.5 4区工程技术

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

引用次数: 0

Masthead: Macromol. React. Eng. 6/2023 刊头：Macromol.React.Eng.6/2023

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-12-14 DOI: 10.1002/mren.202370013

引用次数: 0

What Can Industrial Catalytic Olefin Polymerization Plants Tell Us About Reaction Kinetics? From Production Rate and Residence Time to Catalyst Reaction Performance. 工业催化烯烃聚合装置能告诉我们什么反应动力学?从生产速率和停留时间到催化剂反应性能。

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-11-29 DOI: 10.1002/mren.202300046

Vasileios Touloupidis, João B. P. Soares

引用次数: 0

On-Line Monitoring Device for Gas Phase Composition Based on Machine Learning Models and Its Application in the Gas Phase Copolymerization of Olefins 基于机器学习模型的气相成分在线监测装置及其在烯烃气相共聚中的应用

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-10-20 DOI: 10.1002/mren.202300043

Xu Huang, Shaojie Zheng, Zhen Yao, Bogeng Li, Wenbo Yuan, Qiwei Ding, Zong Wang, Jijiang Hu

{"title":"On-Line Monitoring Device for Gas Phase Composition Based on Machine Learning Models and Its Application in the Gas Phase Copolymerization of Olefins","authors":"Xu Huang, Shaojie Zheng, Zhen Yao, Bogeng Li, Wenbo Yuan, Qiwei Ding, Zong Wang, Jijiang Hu","doi":"10.1002/mren.202300043","DOIUrl":"10.1002/mren.202300043","url":null,"abstract":"This study addresses the challenges of time-delay and low accuracy in online gas-phase composition monitoring during olefin copolymerization processes. Three flowmeters based on different mechanisms are installed in series to measure the real-time exhaust gas flow rate from the reactor. For the same gas flow, the three flowmeters display different readings, which vary with the properties and composition of the gas mixture. Consequently, the composition of the mixed gas can be determined by analyzing the reading of the three flowmeters. Fitting equations and three machine learning models, namely decision trees, random forests, and extreme gradient boosting, are employed to calculate the gas composition. The results from cold-model experimental data demonstrate that the XGBoost model outperforms others in terms of accuracy and generalization capabilities. For the concentration of ethylene, propylene, and hydrogen, the determination coefficients (R2) were 0.9852, 0.9882, and 0.9518, respectively, with corresponding normalized root mean square error (NRMSE) values of 0.0352, 0.0312, and 0.0706. The effectiveness of the online monitoring device is further validated through gas phase copolymerization experiments involving ethylene and propylene. The yield and composition of the ethylene and propylene copolymers are successfully predicted using the online measurement data.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112364","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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Monomer Transport in Emulsion Polymerization IV Gaseous Monomers 乳液聚合中的单体迁移 IV 气体单体

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-10-19 DOI: 10.1002/mren.202300048

Julia Merlin, F. Joseph Schork

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Masthead: Macromol. React. Eng. 5/2023 刊头：Macromol。反应工程5/2023

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-10-18 DOI: 10.1002/mren.202370011

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Toward Reactive Processing of Polyamide 6 Based Blends with Polyethylene Grafted with Maleic Anhydride and Acrylic Acid: Effect of Functionalization Degree 马来酸酐和丙烯酸接枝聚乙烯与聚酰胺6基共混物的反应加工：官能化程度的影响

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-10-18 DOI: 10.1002/mren.202370010

Carlos Bruno Barreto Luna, Eduardo da Silva Barbosa Ferreira, Anna Raffaela de Matos Costa, Yeda Medeiros Bastos de Almeida, João Baptista da Costa Agra de Melo, Edcleide Maria Araújo

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