Macromolecular Reaction Engineering最新文献_第2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，说明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 : 2024-06-18 DOI: 10.1002/mren.202470005

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

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Application of Network Dimension Theory to the Kinetics of Nanogel Formation in Miniemulsion Vinyl/Divinyl Copolymerization: Free‐Radical and Living Polymerization 网络尺寸理论在乙烯基/二乙烯基共聚微乳液纳米凝胶形成动力学中的应用：自由基和活聚合

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-06-10 DOI: 10.1002/mren.202400014

H. Tobita

{"title":"Application of Network Dimension Theory to the Kinetics of Nanogel Formation in Miniemulsion Vinyl/Divinyl Copolymerization: Free‐Radical and Living Polymerization","authors":"H. Tobita","doi":"10.1002/mren.202400014","DOIUrl":"https://doi.org/10.1002/mren.202400014","url":null,"abstract":"In vinyl/divinyl copolymerization, a crosslink is formed by the reaction between an active center and a pendant double bond. When both the active center and the pendant double bond are located within the same polymer molecule, the cyclization occurs, which is ineffective for growth in molecular weight. In the present model, the network dimension theory is applied to estimate the mean‐square radius of gyration for the growing polymer molecule, which is used to account for the enrichment effect of pendant double bonds around the active center for the cyclization reaction. The model is applied to the miniemulsion copolymerization, and both conventional free‐radical polymerization and ideal living polymerization are considered. Some of important characteristics of network architecture formed in these two types of polymerization mechanisms that cannot be predicted based on the classical chemical kinetics can be reproduced by the model, such unique characteristics as the pendant double bonds are consumed from the beginning of polymerization in the conventional free‐radical polymerization but not so in the living polymerization. The present model provides useful insights into the size and structural dependent network formation kinetics without relying on the lattice model.This article is protected by copyright. All rights reserved","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141362715","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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Environmentally Friendly Synthesis of Polymer Nanoparticles in a Packed Reactor Using Glass Beads 使用玻璃珠在填料反应器中以环保方式合成聚合物纳米颗粒

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-05-09 DOI: 10.1002/mren.202400009

Tetsuya Yamamoto, Ayumi Morino, Hideki Kanda, Ayumu Seki, Toru Ishigami

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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对反应动力学有何启示？从生产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 : 2024-04-18 DOI: 10.1002/mren.202470003

Vasileios Touloupidis, João B. P. Soares

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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":null,"pages":null},"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}

引用次数: 0

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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}

引用次数: 0

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

引用次数: 0