Macromolecular Reaction Engineering最新文献_第2页

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}

引用次数: 0

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}

引用次数: 0

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}

引用次数: 0

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}

引用次数: 0

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

引用次数: 0

Kinetics of the Aqueous-Phase Copolymerization of AA and HPEG Macromonomer in Acidic Media 酸性介质中AA与HPEG大单体水相共聚动力学研究

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-20 DOI: 10.1002/mren.202400043

Kevin Palma-Lemus, Shaghayegh Hamzehlou, Vincent Froidevaux, Pascal Boustingorry, Jose Ramon Leiza

{"title":"Kinetics of the Aqueous-Phase Copolymerization of AA and HPEG Macromonomer in Acidic Media","authors":"Kevin Palma-Lemus, Shaghayegh Hamzehlou, Vincent Froidevaux, Pascal Boustingorry, Jose Ramon Leiza","doi":"10.1002/mren.202400043","DOIUrl":"https://doi.org/10.1002/mren.202400043","url":null,"abstract":"Water-soluble monomers are extensively used in the production of polymeric materials in aqueous media for various applications. Acrylic acid–polyethylene glycol 2-methyl-2-propenyl ether (AA-HPEG) copolymers belong to the class of comb-like polycarboxylate ether (PCE) polymers, employed as superplasticizers for cementitious materials. Due to different reactivity ratios of AA and HPEG, semibatch operations with optimized monomer addition profiles are required to enhance the incorporation of HPEG into the copolymer. The kinetics of this system is complex and, like other water-soluble monomers, depends on monomer concentration, pH, and ionic strength. Despite its high-volume industrial usage, the kinetics of this system have received little attention in the literature. Furthermore, the presence of the HPEG, with 55 ethylene oxide (EO) units in the side chain, complicates the precise determination of individual monomer conversions. To address this, various characterization methods are evaluated, including proton nuclear magnetic resonance (1H-NMR) and size-exclusion chromatography (SEC). Results show that HPEG conversion is determined more accurately using 1H-NMR signals from the polymer than unreacted monomer signals or SEC traces. Aqueous semibatch AA-HPEG copolymerization experiments are conducted in acidic media to investigate the effects of comonomer feeding time, initiator and chain-transfer agent concentrations on the copolymerization kinetics, HPEG incorporation, and molar mass.","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":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202400043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431470","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

Parameters Governing Void Formation and Expansion of Hollow Natural Rubber Latex Particles for Their Use as Bio-based Nanocapsules 中空天然橡胶胶乳颗粒作为生物基纳米胶囊的空隙形成和膨胀参数

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-18 DOI: 10.1002/mren.202400036

Duangkamol Promlok, Teeraporn Suteewong, Duangporn Polpanich, Pramuan Tangboriboonrat

{"title":"Parameters Governing Void Formation and Expansion of Hollow Natural Rubber Latex Particles for Their Use as Bio-based Nanocapsules","authors":"Duangkamol Promlok, Teeraporn Suteewong, Duangporn Polpanich, Pramuan Tangboriboonrat","doi":"10.1002/mren.202400036","DOIUrl":"https://doi.org/10.1002/mren.202400036","url":null,"abstract":"This work reports the hollow latex (HL) particles developed from natural rubber latex particles (NRPs), known for their broad size distribution and non-spherical shape. HL-NRPs, prepared via the seeded emulsion polymerization in one pot, are studied as potential bio-based nanocapsules for the first time. Effects of types of crosslinking agents and swelling agents, the addition of sodium dodecyl sulfate (SDS), and monomer compositions on the void formation and expansion are systematically investigated. The combined effects of phase separation between NR core swelled with divinyl benzene (DVB) and hydrophilic poly(methyl methacrylate/acrylic acid) P(MMA/AA) shell, the entanglement of rubber chains copolymerized with MMA/DVB/AA monomers, and the osmosis from external aqueous medium promoted the void formation. While crosslinking agents affected the void formation and shell strength, SDS and type of monomers governed colloidal stability and polymerization loci as well as morphology, respectively. The ability of HL-NRPs as nanocapsules is explored by encapsulating fluorescent dyes, i.e., hydrophilic fluorescein isothiocyanate (FITC) and lipophilic Nile red (NiR), as model cargo. From the dye release test after 24 h, the cumulative concentrations of FITC in methanol and of NiR in tetrahydrofuran are 0.17 and 0.11 µg mL−1, respectively. The results suggested that FITC is released from HL-NRPs easier than NiR possibly due to the different encapsulation location.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431306","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

Michael Addition Reaction-Assisted Surface Modification of Melanin Particles for Water-Repellent Structural Color Coating 加成反应辅助防水性结构涂料中黑色素颗粒的表面改性

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-18 DOI: 10.1002/mren.202400040

Yui Maejima, Mana Tomizawa, Ai Takabatake, Shin-ichi Takeda, Hiroshi Fudouzi, Keiki Kishikawa, Michinari Kohri

{"title":"Michael Addition Reaction-Assisted Surface Modification of Melanin Particles for Water-Repellent Structural Color Coating","authors":"Yui Maejima, Mana Tomizawa, Ai Takabatake, Shin-ichi Takeda, Hiroshi Fudouzi, Keiki Kishikawa, Michinari Kohri","doi":"10.1002/mren.202400040","DOIUrl":"https://doi.org/10.1002/mren.202400040","url":null,"abstract":"There is significant interest in developing paints based on structural colors, which do not fade like dyes and pigments. To use these paints as coatings, it is necessary to have a technology that can easily impart structural color to the material's surface without changing color based on the viewing angle. In addition, water-repellent properties that lead to stain resistance are required for practical application. This study applies a structural color coating by synthesizing hydrophobic melanin particles using the Michael addition reaction and arranging these particles on a substrate at high speed. The resulting coating film shows angle-independent structural color due to the amorphous structure of the particle arrangement, and the color tone could be controlled by adjusting the particle size. The combination of the particle's hydrophobic surface and the microscopic unevenness from the arrangement structure produced a superhydrophobic coating with a contact angle of over 160°. Since the Lotus effect, resulting from superhydrophobic surfaces, can maintain the cleanliness of structural color coatings, the findings of this research will contribute to the development of next-generation coating technology.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431307","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

Masthead: Macromol. React. Eng. 6/2024 报头:絮凝。反应。Eng。6/2024

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-16 DOI: 10.1002/mren.202470012

引用次数: 0

Front Cover: Macromol. React. Eng. 6/2024 封面：Macromol。反应。Eng。6/2024

IF 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-12-16 DOI: 10.1002/mren.202470011

引用次数: 0