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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
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":null,"pages":null},"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":null,"pages":null},"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, Zhong‐Xin Liu, Yin‐Ning Zhou, Zheng‐Hong Luo","doi":"10.1002/mren.202400021","DOIUrl":"https://doi.org/10.1002/mren.202400021","url":null,"abstract":"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 (Ea, A, ΔH‡, and ΔS‡) by multiple linear regression using the Catalan linear free‐energy relationship (LFER) equation for the anionic polymerization of styrene. The results show that Ea, ΔH‡, and ΔS‡ have a low correlation with dipole moment, whereas A is strongly correlated with dipole moment. Given the fact that the larger A the larger effective collision frequency Z, 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, Ea, A and kp are predicted for 173 solvents using well‐established descriptive relationships.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":null,"pages":null},"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
On the Mechanism of Nucleation and Monomer Transport in Inverse Emulsion Polymerization 论逆乳液聚合中的成核和单体迁移机理
IF 1.5 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-08-03 DOI: 10.1002/mren.202400017
F. Joseph Schork
{"title":"On the Mechanism of Nucleation and Monomer Transport in Inverse Emulsion Polymerization","authors":"F. Joseph Schork","doi":"10.1002/mren.202400017","DOIUrl":"https://doi.org/10.1002/mren.202400017","url":null,"abstract":"A rationale for droplet nucleation during inverse emulsion polymerization (IEP) (reported by previous investigators) is proposed. Based on the idea that smaller monomer droplets are nucleated into polymer particles, while larger droplets serve as reservoirs for monomer (as in a micellar nucleation mechanism) the question of possible monomer‐transport limitation during polymerization is explored.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141944321","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
Bio‐Inspired Polydiacetylene Vesicles for Controlling Stimulus Sensitivity 用于控制刺激灵敏度的生物启发聚二乙烯囊泡
IF 1.5 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-07-29 DOI: 10.1002/mren.202400016
Shota Nakayama, Keishi Suga, Tatsuya Kamata, Kanako Watanabe, Hikaru Namigata, Tom A. J. Welling, Daisuke Nagao
{"title":"Bio‐Inspired Polydiacetylene Vesicles for Controlling Stimulus Sensitivity","authors":"Shota Nakayama, Keishi Suga, Tatsuya Kamata, Kanako Watanabe, Hikaru Namigata, Tom A. J. Welling, Daisuke Nagao","doi":"10.1002/mren.202400016","DOIUrl":"https://doi.org/10.1002/mren.202400016","url":null,"abstract":"Polydiacetylene (PDA) is a kind of photopolymerizable polymer, which exhibits a unique color transition in response to external stimuli such as heat, pH, and solvent. PDAs are attractive as eye‐detection stimulus sensors with excellent time performance; however, the sensitivity of PDAs should be improved. Considering the biological membrane‐like structure of diacetylene (DA) vesicles, their modification by incorporating membrane lipids (e.g., diacylphosphocholine, PC) can be used to control the membrane fluidity, and consequently molecular ordering of DAs in the vesicle. Inspired by biological membrane systems, lipid vesicles are employed as platforms to generate PDA, and essential factors that influence the sensitivity of PDA are investigated. By lowering the polymerization temperature, the generation of PDA becomes slower, while the sensitivity improves. By adding PCs at the molar ratio of lipid:DA = 1:1, the sensitivity of PDA can be varied: the PCs with lower phase transition temperatures (<jats:italic>T</jats:italic><jats:sub>m</jats:sub>) made PDA insensitive, while the PCs with higher <jats:italic>T</jats:italic><jats:sub>m</jats:sub> improved the sensitivity as compared to pure poly(PCDA). It is concluded that the photopolymerization of DAs with a lower membrane fluidity induces highly sensitive PDA, while the photopolymerization of DAs with a higher membrane fluidity induces insensitive PDA with robustness toward stimuli.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871416","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. 3/2024 刊头：Macromol.React.Eng.3/2024
IF 1.5 4区 工程技术
Macromolecular Reaction Engineering Pub Date : 2024-06-18 DOI: 10.1002/mren.202470006
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引用次数: 0
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