Macromolecular Reaction Engineering最新文献_第3页

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, Luciana Dutra, Ariane de J. Sousa-Batista, José Carlos Pinto","doi":"10.1002/mren.202400022","DOIUrl":"https://doi.org/10.1002/mren.202400022","url":null,"abstract":"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","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 1.8 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":"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":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202400013","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":"OA","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

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

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 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-08-16 DOI: 10.1002/mren.202400018

Bhoomi Het Mavani, Alexander Penlidis

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":"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":"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

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 1.8 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2024-08-03 DOI: 10.1002/mren.202400017

F. Joseph Schork

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 1.8 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":"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 (Tm) made PDA insensitive, while the PCs with higher Tm 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":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202400016","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":"OA","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

引用次数: 0

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

引用次数: 0