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Masthead: Macromol. React. 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
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引用次数: 0
Front Cover: Macromol. React. 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
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引用次数: 0
Masthead: Macromol. React. Eng. 5/2024 刊头：Macromol.React.Eng.5/2024
IF 1.8 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-10-18 DOI: 10.1002/mren.202470010
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引用次数: 0
Front Cover: Macromol. React. Eng. 5/2024 封面：Macromol.React.Eng.5/2024
IF 1.8 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-10-18 DOI: 10.1002/mren.202470009
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引用次数: 0
Poly(butylene succinate) Microparticles Prepared Through Green Suspension Polycondensations 通过绿色悬浮缩聚法制备聚丁二酸丁二醇酯微粒
IF 1.8 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-10-15 DOI: 10.1002/mren.202400022
Jéssica Bentes, Luciana Dutra, Ariane de J. Sousa-Batista, José Carlos Pinto
{"title":"Poly(butylene succinate) Microparticles Prepared Through Green Suspension Polycondensations","authors":"Jéssica Bentes,&nbsp;Luciana Dutra,&nbsp;Ariane de J. Sousa-Batista,&nbsp;José Carlos Pinto","doi":"10.1002/mren.202400022","DOIUrl":"https://doi.org/10.1002/mren.202400022","url":null,"abstract":"<p>The demand for sustainable polymer particles production is growing, driven by the need for efficient, biocompatible, and biodegradable materials. In this context, the present study explores the production of poly(butylene succinate) (PBS) particles in a single step using a green heterogeneous suspension process, using vegetable oil as the suspending medium. Particularly, the effects of oil type (soybean, corn, sunflower), dispersed phase holdup (10–30 wt.%), stabilizers (Span 20, Span 80, Tween 80, Brij 52, Brij 93, Igepal-co-520,  Polyglycerol polyricinoleate (PGPR)), reaction time (1–5 h), and temperature (100–160 °C) on the suspension polymerization are investigated. Results indicate that particle size and shape are influenced by the vegetable oil and stabilizer. Additionally, it is shown that the particle size distribution is affected by the use of a sonicator, allowing the manufacture of even smaller microsized particles. Based on the results, a 30 wt.% holdup in corn oil with a blend of surfactants can be recommended, producing spherical particles with an average diameter of 100 µm. Moreover, higher reaction temperatures (160 °C) and longer reaction times (5 h) positively impacted the molar mass of the obtained particles. Finally, cytotoxicity tests using Bone Marrow-Derived Macrophages cells confirmed the safe use of PBS microparticles at concentrations up to 1000 µg mL⁻¹</p>","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861354","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
Monomer Transport by Collisions in (Mini) Emulsion Polymerization, a Personal Perspective 微型）乳液聚合中单体的碰撞迁移，个人视角
IF 1.5 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-09-03 DOI: 10.1002/mren.202400013
Alexander M. van Herk
{"title":"Monomer Transport by Collisions in (Mini) Emulsion Polymerization, a Personal Perspective","authors":"Alexander M. van Herk","doi":"10.1002/mren.202400013","DOIUrl":"https://doi.org/10.1002/mren.202400013","url":null,"abstract":"Transport of monomer from droplets to growing latex particles in emulsion polymerization in general is assumed to proceed via diffusion through the aqueous phase. Especially in miniemulsion polymerizations the direct transfer of very hydrophobic species from droplet to droplet is assumed to also proceed via collisions. Amongst the hydrophobic species where this is shown to play a role are monomers, initiators, inhibitors and (catalytic) chain transfer agents. It is well known that the reactor geometry and the stirring speed can have a profound effect on emulsion polymerizations. The 1972 paper of Nomura on the effect of stirring on emulsion polymerization is cited more than 100 times and until today keeps scientists intrigued. Diffusion limitations of monomer going from the droplet into the aqueous phase can occur for very hydrophobic monomers. The alternative route of transport via collisions is often not considered. In this perspective, paper will discuss the evidence for collision based transfer in miniemulsion polymerization and also consider whether collision based monomer transport can play a role in regular emulsion polymerizations.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"3 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208552","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
Front Cover: Macromol. React. Eng. 4/2024 封面：Macromol.React.Eng.4/2024
IF 1.8 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-08-18 DOI: 10.1002/mren.202470007
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引用次数: 0
Masthead: Macromol. React. Eng. 4/2024 刊头：Macromol.React.Eng.4/2024
IF 1.8 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-08-18 DOI: 10.1002/mren.202470008
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引用次数: 0
Tailoring Polyaniline for Improved Acetaldehyde Detection 为改进乙醛检测而定制聚苯胺
IF 1.5 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-08-16 DOI: 10.1002/mren.202400018
Bhoomi Het Mavani, Alexander Penlidis
{"title":"Tailoring Polyaniline for Improved Acetaldehyde Detection","authors":"Bhoomi Het Mavani, Alexander Penlidis","doi":"10.1002/mren.202400018","DOIUrl":"https://doi.org/10.1002/mren.202400018","url":null,"abstract":"This study investigates polyaniline (PANI) for its sensing characteristics for detecting acetaldehyde. Pristine PANI is further modified in two ways to improve its sensing capabilities: 1) addition of a side chain (i.e., two methyl groups) to form poly (2,5‐dimethylaniline), 2) addition of small amounts of metal oxide dopant (In<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> in this case) to PANI. All the materials are evaluated for their sensing characteristics with respect to both sensitivity and selectivity. The sensitivity of PANI toward acetaldehyde is found to improve with both types of modification (i.e., poly (2,5‐dimethylaniline) and PANI doped with different wt.% of In<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>). However, upon evaluating selectivity toward acetaldehyde using binary and ternary gas mixtures, pristine PANI exhibited higher selectivity compared to its modified counterparts.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"11 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208553","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
Determining the Kinetic and Thermodynamic Parameters of Anionic Polymerization of Styrene Using Linear Free-Energy Relationship 利用线性自由能关系确定苯乙烯阴离子聚合的动力学和热力学参数
IF 1.8 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-08-09 DOI: 10.1002/mren.202400021
Shen Li, Zhong-Xin Liu, Yin-Ning Zhou, Zheng-Hong Luo
{"title":"Determining the Kinetic and Thermodynamic Parameters of Anionic Polymerization of Styrene Using Linear Free-Energy Relationship","authors":"Shen Li,&nbsp;Zhong-Xin Liu,&nbsp;Yin-Ning Zhou,&nbsp;Zheng-Hong Luo","doi":"10.1002/mren.202400021","DOIUrl":"10.1002/mren.202400021","url":null,"abstract":"<p>The effect of solvents on kinetic parameters of anionic polymerization is complex and a comprehensive theoretical study has been rare. In this work, four solvent polarity descriptors (i.e., polarizability, dipole moment, nucleophilic index, electrophilic index) are correlated with solvent parameters (<i>E<sub>a</sub></i>, <i>A</i>, Δ<i>H</i>‡, and Δ<i>S</i>‡) by multiple linear regression using the Catalan linear free-energy relationship (LFER) equation for the anionic polymerization of styrene. The results show that <i>E<sub>a</sub></i>, Δ<i>H</i>‡, and Δ<i>S</i>‡ have a low correlation with dipole moment, whereas <i>A</i> is strongly correlated with dipole moment. Given the fact that the larger <i>A</i> the larger effective collision frequency <i>Z</i>, it is hypothesized that in polar solvents, the polymer chains are more extended, enabling more effective collisions between monomers and active anionic species during polymerization. In contrast, in nonpolar solvents, the polymer chains collapse, making it more difficult for the monomer to be inserted into the ion pairs. Subsequently, n-pentane and tetrahydrofuran are chosen as representatives to confirm this conjecture by molecular simulations. Lastly, <i>E<sub>a</sub></i>, <i>A</i> and <i>k<sub>p</sub></i> are predicted for 173 solvents using well-established descriptive relationships.</p>","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"18 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141922999","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
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