Macromolecular Reaction Engineering最新文献_第2页

Issue Information: Macromol. React. Eng. 1/2025 发布信息：Macromol。反应。Eng。1/2025

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2025-02-17 DOI: 10.1002/mren.202570002

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Environmentally Friendly Synthesis of Polymer Nanoparticles in a Packed Reactor Using Glass Beads 利用玻璃微珠在填充反应器中环保合成聚合物纳米颗粒

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2025-02-17 DOI: 10.1002/mren.202570001

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

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Special Issue Dedicated to the Memory of Professor Mamoru Nomura who Passed Away on October 29, 2023 纪念2023年10月29日逝世的野村守教授特刊

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2025-02-17 DOI: 10.1002/mren.202400041

Hidetaka Tobita

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Kinetics Dependence of RAFT Emulsion Polymerization of 2-Ethylhexyl Acrylate on Initiator Concentrations 引发剂浓度对丙烯酸2-乙基己酯RAFT乳液聚合动力学的影响

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2025-02-11 DOI: 10.1002/mren.202400051

Huanxin Ni, Yingwu Luo

{"title":"Kinetics Dependence of RAFT Emulsion Polymerization of 2-Ethylhexyl Acrylate on Initiator Concentrations","authors":"Huanxin Ni, Yingwu Luo","doi":"10.1002/mren.202400051","DOIUrl":"https://doi.org/10.1002/mren.202400051","url":null,"abstract":"Reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization with a well-designed amphiphilic macroRAFT agent as a surfactant has been well-developed as a powerful tool to synthesize high molecular weight multiblock copolymers. However, the polymerization kinetics research has been mostly limited to styrene polymerization. It has been reported that the dependence of the particle number on initiator concentration is described by Np∝[I]−0.4 in amphiphilic macroRAFT-mediated emulsion polymerization of styrene, which surprisingly deviates from the classical Smith–Eward equation. In the current study, the dependence of polymerization kinetics on the initiator concentration in the RAFT emulsion polymerization of 2-ethylhexyl acrylate (EHA) is investigated. It is revealed that the dependence of the particle number on initiator concentration (Np∝[I]−0.29) is similar to that of styrene but the exponent is less. Additionally, compared to styrene polymerization, the inhibition period in EHA polymerization is significantly extended due to the much lower water-solubility of EHA.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"19 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144299944","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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Free Radical Entry in Emulsion Polymerization: A Comprehensive Theory 乳液聚合中的自由基进入：一个综合理论

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2025-02-09 DOI: 10.1002/mren.202400047

Jorge Herrera-Ordonez

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Dynamic Modeling and Simulations of Molecular Weight Distributions In Continuous Stirred Tank Reactors for Solution Polymerization of Methyl Methacrylate 甲基丙烯酸甲酯溶液聚合连续搅拌釜反应器中分子量分布的动态建模与模拟

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2025-02-09 DOI: 10.1002/mren.202400054

Benjamin Robinson, Kyu Yong Choi

{"title":"Dynamic Modeling and Simulations of Molecular Weight Distributions In Continuous Stirred Tank Reactors for Solution Polymerization of Methyl Methacrylate","authors":"Benjamin Robinson, Kyu Yong Choi","doi":"10.1002/mren.202400054","DOIUrl":"https://doi.org/10.1002/mren.202400054","url":null,"abstract":"The finite molecular weight moments (FMWM) technique, originally developed for calculating the complete molecular weight distribution (MWD) in batch free radical polymerizations, is extended here to simulate transient changes in MWD in a series of continuous flow stirred-tank solution polymerization reactors. Unlike the classical method of molecular weight moments, which only calculates molecular weight averages, the FMWM technique provides a simple and effective means to calculate the whole shape of the polymer molecular weight distribution curve, even during the transient period of reactor operations in continuous processes. In this work, the solution polymerization of methyl methacrylate is used as a model system to demonstrate that the FMWM technique can successfully simulate transient MWDs, particularly bimodal distributions of polymer molecular weight resulting from varying reactor operating conditions in a series of two consecutive continuous stirred-tank reactors operating at different temperatures. The simulation results reveal several interesting aspects of how polymer MWD changes over time in each reactor.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"19 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144299599","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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Aqueous and Non-Aqueous Synthesis of 2-(Dimethylamino)ethyl Methacrylate (Co)Polymers by Solution Radical Polymerization: Modeling and Experimental Study 水溶液自由基聚合法合成2-（二甲氨基）甲基丙烯酸乙酯（Co）聚合物的模拟与实验研究

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2025-02-07 DOI: 10.1002/mren.202400053

Opeyemi J. Ajogbeje, Mohammad Pishnamazi, Igor Lacík, Robin A. Hutchinson

{"title":"Aqueous and Non-Aqueous Synthesis of 2-(Dimethylamino)ethyl Methacrylate (Co)Polymers by Solution Radical Polymerization: Modeling and Experimental Study","authors":"Opeyemi J. Ajogbeje, Mohammad Pishnamazi, Igor Lacík, Robin A. Hutchinson","doi":"10.1002/mren.202400053","DOIUrl":"https://doi.org/10.1002/mren.202400053","url":null,"abstract":"The radical polymerization kinetics of 2-(dimethylamino)ethyl methacrylate (DMAEMA) is explored in dimethyl sulfoxide, ethanol (EtOH), ethanol-water (EtOH/H2O), and water. In situ nuclear magnetic resonance (NMR) spectroscopy is used to study both solvolysis and polymerization kinetics. Hydrolysis of nonionized DMAEMA occurs in H2O and ethanolysis in EtOH/H2O mixtures to form both methacrylic acid (MAA) and ethyl methacrylate (EMA), with the presence of water increasing the rate of ethanolysis in the mixed solvent. Although some solvolysis occurred in EtOH and EtOH/H2O containing 25 wt.% H2O, the rates are sufficiently low that essentially poly(DMAEMA) homopolymer is synthesized, unlike the DMAEMA/MAA copolymer formed in water and the DMAEMA/MAA/EMA terpolymer formed in water-rich EtOH/H2O. A model is constructed to represent the polymerization of nonionized DMAEMA in solution, with the experimental results used to estimate key rate coefficients. The model predictions show good agreement with the experimental data on monomer conversion, average molar masses, and molar mass distributions. Similarly, the rate coefficients for polymerization of ionized DMAEMA are estimated based on experiments conducted in water at pH 1 and 4. The understanding gained from these studies is combined into a comprehensive mechanistic model to describe the polymerization of partially-ionized DMAEMA in the presence of hydrolysis.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"19 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202400053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144299972","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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Preparation of High-Heat-Resistant Silicone Hollow Particles 高耐热硅树脂中空颗粒的制备

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-23 DOI: 10.1002/mren.202400046

Hyota Nishi, Shintaro Ishidate, Ryuta Amasaki, Reina Nakamoto, Shinya Katsube, Nozomu Suzuki, Toyoko Suzuki, Hideto Minami

{"title":"Preparation of High-Heat-Resistant Silicone Hollow Particles","authors":"Hyota Nishi, Shintaro Ishidate, Ryuta Amasaki, Reina Nakamoto, Shinya Katsube, Nozomu Suzuki, Toyoko Suzuki, Hideto Minami","doi":"10.1002/mren.202400046","DOIUrl":"https://doi.org/10.1002/mren.202400046","url":null,"abstract":"Single hollow particles are used in various fields, particularly in thermal insulation materials, owing to their low thermal conductivity attributed to encapsulated air properties. “The self-assembling phase separated polymer (SaPSeP) method” is an original hollowing method that is proposed by this laboratory 25 years ago. Most hollow particles prepared by the SaPSeP method have carbon, oxygen, and hydrogen polymer shells, which lack sufficient heat resistance. In this study, hollow particles with a silicone shell, which is highly heat-resistant, are prepared using the SaPSeP method using a trimer of 3-methacryloxypropylmethyldimethoxysilane (MPDS). The MPDS trimer (3MPDS) is synthesized through the sol–gel reaction of MPDS with a basic aqueous solution. Additionally, hollow particles are prepared using a new silicone oligomer composed of MPDS and dimethoxymethylvinylsilane (DMVS). Both hollow particles prepared from 3MPDS and from a new silicone oligomer composed of MPDS and DMVS showed high heat resistance. They maintained their hollow structure even when exposed to temperatures up to 900 °C.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431488","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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Preparation of Monodisperse Cross-Linked Elastic Silicone Particles 单分散交联弹性硅微粒的制备

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-20 DOI: 10.1002/mren.202400037

Reina Nakamoto, Yuya Takeuchi, Yohei Okubo, Keisuke Fujita, Toyoko Suzuki, Hideto Minami

{"title":"Preparation of Monodisperse Cross-Linked Elastic Silicone Particles","authors":"Reina Nakamoto, Yuya Takeuchi, Yohei Okubo, Keisuke Fujita, Toyoko Suzuki, Hideto Minami","doi":"10.1002/mren.202400037","DOIUrl":"https://doi.org/10.1002/mren.202400037","url":null,"abstract":"Micrometer-sized monodisperse silicone droplets are prepared through a sol–gel process involving 3-methacryloxypropylmethyldimethoxysilane (MPDS) at room temperature for 1.5 h in the presence of NH3 as a catalyst. The size of the obtained droplets is controlled by changing the stabilizer concentration and solvent polarity. However, the obtained droplets have not maintained their particulate shape in the dry state due to the absence of a cross-linking structure. Thus, radical polymerization is performed on the obtained silicone droplets at 70 °C for 2 h; consequently, spherical particles with high monodispersity are observed in the dry state, indicating the presence of a cross-linked structure. Microcompression tests are conducted to evaluate the mechanical properties of the silicone particles. Initially, the recovery ratio (elasticity) is not high because the molecular weight of the silicone particles is low, ≈600, due to MPDS cyclization (MPDS trimer). Anionic ring-opening polymerization is therefore performed to extend the molecular weight of the MPDS trimer. Benzyldodecyldimethylammonium bromide and tetrakis[tris(dimethylamino)phosphoranylidenamino]phosphonium chloride are used as catalysts for anionic ring-opening polymerization. These catalysts increased the molecular weight to ≈2000 and 7600, respectively. Furthermore, the silicone particles obtained through anion ring-opening polymerization and radical polymerization have high recovery ratios (elasticity).","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431468","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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Industrial Synthesis of Linear Low-Density Polyethylene with H-Shape Long-Chain-Branching Structures Using Ziegler-Natta Catalysts 使用齐格勒-纳塔催化剂工业合成具有 H 型长链分支结构的线性低密度聚乙烯

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-20 DOI: 10.1002/mren.202400044

Bingyu Zhang, Fengtao Chen, Jin-Yong Dong

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