Macromolecular Reaction Engineering最新文献_第9页

Alkylaluminum/Urea Hybrid Cocatalysts and Their Use in Iron-Catalyzed Oligomerization of Ethylene 烷基铝/尿素杂化助催化剂及其在铁催化乙烯齐聚中的应用

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-28 DOI: 10.1002/mren.202300013

Ying Zhang, Jian Ye, Yinzhi Jiang, Shuqin Jiang, Wei Xiao, Dongchu Wei

{"title":"Alkylaluminum/Urea Hybrid Cocatalysts and Their Use in Iron-Catalyzed Oligomerization of Ethylene","authors":"Ying Zhang, Jian Ye, Yinzhi Jiang, Shuqin Jiang, Wei Xiao, Dongchu Wei","doi":"10.1002/mren.202300013","DOIUrl":"10.1002/mren.202300013","url":null,"abstract":"The bis(imino)pyridyl iron-based ethylene oligomerization catalysts have the advantages of mild reaction conditions, high activity and high selectivity to linear α-olefins. However, barriers, such as high polymer content in the product mixture and large methylaluminoxane (MAO) dosage, are still limitations for the development of these systems at the industrial scale. In this study, new cocatalysts are prepared by the reaction of alkylaluminums with urea and its derivatives, and successfully used to activate iron-based catalysts. It is found that the type and molar ratio of alkylaluminum and urea have significant influence on the performance of the cocatalysts. The activity of the preferred triisobutylaluminum/urea activated systems reaches more than 3.0 × 108 g (mol-Fe)−1 h−1, and the polymer content can be controlled to be less than 2 wt.%. Notably, the catalytic system exhibits good high temperature stability, the activity can still reach 1.0 × 108 g (mol-Fe)−1 h−1 even at 120 °C. Further 1H NMR studies show that alkylaluminum can react with the NH moieties of urea, forming complex alkylaluminum clusters, even aluminoxane-like structures. This study offers a promising family of cocatalysts, making it possible to simultaneously improve their performance and reduce their cost.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46844419","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

Temperature-Optimized Synthesis of SiO2-Reinforced N-(Alkyl)Acrylamide-Based Semi-IPN Hybrid Gels Functionalized with Methacrylic Acid Units 甲基丙烯酸单元功能化SiO2增强N（烷基）丙烯酰胺基半互穿网络杂化凝胶的温度优化合成

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-23 DOI: 10.1002/mren.202300006

Birgül Kalkan, Merve Mocan, Nermin Orakdogen

{"title":"Temperature-Optimized Synthesis of SiO2-Reinforced N-(Alkyl)Acrylamide-Based Semi-IPN Hybrid Gels Functionalized with Methacrylic Acid Units","authors":"Birgül Kalkan, Merve Mocan, Nermin Orakdogen","doi":"10.1002/mren.202300006","DOIUrl":"10.1002/mren.202300006","url":null,"abstract":"In order to obtain a pH and temperature sensitive hybrids with a controlled structure, synthesis of N-(alkyl)acrylamide-based semi-interpenetrating polymer network (semi-IPN) reinforced with silica (SiO2) nanoparticles and functionalized with methacrylic acid units is carried out by optimizing the polymerization temperature. The study aims to understand the effect of polymerization temperature on the physical properties of semi-IPN hybrids. Changing preparation temperature between −30 and 23 °C leads to significant differences in physico-mechanical results, swelling tendency and adsorption ability, while silica nanoparticles strengthen hybrid walls, preventing their collapse during deswelling and providing rapid response. The hybrids prepared at higher temperatures are found to swell more and faster in water, while the lowest swelling is observed those prepared at 5 °C. The incorporation of SiO2 particles into copolymer structure via physical crosslinking with network chains enhances the elasticity. The effect of polymerization temperature on adsorption is investigated using methylene blue as a model dye. Increasing polymerization temperature increases the adsorption rate and shortens time to reach the equilibrium point, and adsorption efficiency increases when polymerization temperature is lowered. The results show that semi-IPN hybrids loaded with silica nanoparticles can be used as alternative and potential adsorbents in the treatment of industrial wastes.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49450263","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

Encapsulated Colorimetric Indicators used as Additives During the Polymerization of Smart Polyethylene 智能聚乙烯聚合过程中用作添加剂的包封比色指示剂

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-22 DOI: 10.1002/mren.202200077

Cesar A. Heck, João Henrique Z. dos Santos

{"title":"Encapsulated Colorimetric Indicators used as Additives During the Polymerization of Smart Polyethylene","authors":"Cesar A. Heck, João Henrique Z. dos Santos","doi":"10.1002/mren.202200077","DOIUrl":"10.1002/mren.202200077","url":null,"abstract":"A number of colorimetric pH indicators (phenolphthalein, bromocresol green, 4-nitrophenol, phenol red, and bromothymol blue) are encapsulated within silica particles via an acid-catalyzed sol–gel process. The fabricated indicator is added during ethylene polymerization with a metallocene (Cp2ZrCl2) catalyst. Introduction of the indicator into the silica matrix affects the surface area, probably by partially blocking some of the pores. The encapsulated pH indicator reduces the catalytic activity by up to 17%, whereas adding a solution of the indicator reduced the catalytic activity by up to 34%. The crystallinities of the samples containing the silica-encapsulated pH indicators are lower than those of the samples to which the pH indicator is added in solution form. The prepared encapsulated colorimetric pH indicators are analyzed by diffuse reflectance UV-vis spectroscopy. The measured color values are distributed according to the CIE Lab lightness psychometric color space. Addition of the indicator in solution form (free) to the ethylene polymerization reaction does not result in indicator activity in acidic or alkaline media. The pH indicators incorporated into the polyethylene show color changes when exposed to acidic and alkaline media. Samples to which the unencapsulated pH indicators (free) are added exhibit lower catalytic activities and higher crystallinities than the samples containing the encapsulated pH.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47277490","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

Synthesis of Waterborne Anticorrosive Coatings Based on The Incorporation of Phosphate Groups to Polyurethane-Acrylate Hybrids 磷酸基掺入聚氨酯-丙烯酸酯杂化物的水性防腐涂料的合成

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-16 DOI: 10.1002/mren.202300015

Aitor Barquero, Oihane Llorente, Daniela Minudri, María Paulis, Jose Ramon Leiza

引用次数: 1

Monitoring of Emulsion Polymerization in the Presence of Ionic Liquids Using NIR Spectroscopy 离子液体存在下乳液聚合的近红外光谱监测

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-14 DOI: 10.1002/mren.202300009

Leila Medeiros Santos, Claudio Dariva, Caroline Martins Masso, Montserrat Fortuny, Alexandre Ferreira Santos

引用次数: 0

Surface Molecularly Imprinted Cellulose-Synthetic Hybrid Particles Prepared via ATRP for Enrichment of Flavonoids in Olive Leaf ATRP制备表面分子印迹纤维素-合成杂化颗粒富集橄榄叶黄酮类化合物

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-13 DOI: 10.1002/mren.202300011

Catarina P. Gomes, Rolando C. S. Dias, Mário Rui P. F. N. Costa

{"title":"Surface Molecularly Imprinted Cellulose-Synthetic Hybrid Particles Prepared via ATRP for Enrichment of Flavonoids in Olive Leaf","authors":"Catarina P. Gomes, Rolando C. S. Dias, Mário Rui P. F. N. Costa","doi":"10.1002/mren.202300011","DOIUrl":"10.1002/mren.202300011","url":null,"abstract":"Surface molecularly imprinted cellulose-synthetic hybrid particles are prepared via atom transfer radical polymerization (ATRP). The two-step process involves the immobilization of α-bromoisobutyryl bromide in the pristine microcrystalline cellulose, to generate ATRP macroinitiator particles, and then the creation of a crosslinked-imprinted shell in the particles surface considering ATRP of 4-vinylpyridine (4VP) and ethylene glycoldimethacrylate (EGDMA) with quercetin as imprinting template. Among the polymerization recipes tested, a system with ethanol as solvent preserves a final size of the hybrid particles suitable for application as adsorbent, while also incorporating the 4VP/EGDMA co-monomers. Testing of imprinted/non-imprinted particles for sorption/desorption of standard phenolic compounds shows the modification of the surface of the pristine cellulose and also the achievement of molecular imprinting (imprinting factor ≈2.6). Particles are used for the enrichment of flavonoids in olive leaf extracts and the special features of the developed molecularly imprinted adsorbents are again highlighted with this complex mixture of phenolic compounds. It is shown that production of fractions rich in luteolin-7-O-glucoside, apigenin-7-O-glucoside, or quercetin, among other flavonoids is possible (estimated enrichment factors up to 4). These results point up for the usefulness of natural-synthetic materials with processes to get high-added value compounds in the framework of circular bio-economy.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mren.202300011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41297434","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

Multivariable Rheological Models for Commercial Polypropylene with High Molar Masses 高摩尔质量商品聚丙烯的多变量流变模型

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-11 DOI: 10.1002/mren.202300008

Carlos A. Castor Jr., André I. O. de A. Fialho, Bruno F. Oechsler, José C. Pinto

{"title":"Multivariable Rheological Models for Commercial Polypropylene with High Molar Masses","authors":"Carlos A. Castor Jr., André I. O. de A. Fialho, Bruno F. Oechsler, José C. Pinto","doi":"10.1002/mren.202300008","DOIUrl":"10.1002/mren.202300008","url":null,"abstract":"This work investigates the fitting performance of conventional rheological models and the development of multivariable rheological models to reproduce experimental rheological data of different industrial grades of linear isotactic polypropylene (iPP) having high mass average molar masses, Mm (164–404 kg mol−1), at three temperature values (180–220 °C) over a wide range of shear rates (10−1–104 s−1). A shear thinning behavior is found in all investigated conditions. However, a low shear rate primary Newtonian plateau for a short shear rate range is only identified for the smallest Mm among those investigated, and for higher Mm such primary plateaus are even found at shorter shear rate range. Among the investigated models, only Cross and Carreau–Yasuda models are effective to reproduce the data for a specific PP grade. Two modified models are proposed that incorporate three variables. In the modified Cross Model, it has been shown that the characteristic time (λ) between the Newtonian plateau at the low shear rates and the shear-rate range with shear-thinning behavior depends exponentially on the Mm, and it does not depend on the temperature. Both proposed models fit very well with the experimental data with shear thinning behavior for a wide range of Mm.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42051520","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

Low Salinity Water–Polymer Flooding in Carbonate Oil Reservoirs: A Critical Review 碳酸盐岩油藏低矿化度水聚合物驱研究进展

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-03-11 DOI: 10.1002/mren.202300007

Fabio Pedro Nascimento, Verônica de Jesus Pereira, Ladislane dos Santos Bastos, Gloria Meyberg Nunes Costa, Silvio Alexandre Beisl Vieira de Melo

引用次数: 2

Copolymerization of ω-Alkenyltrimethylsilane/Propylene with Heterogeneous Ziegler-Natta Catalyst: How Dose Alkenyl Length Affect Comonomer Incorporation? ω -烯基三甲基硅烷/丙烯与异相Ziegler - Natta催化剂的共聚:烯基长度如何影响共聚单体的掺入?

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-26 DOI: 10.1002/mren.202300004

Fengtao Chen, Zhijian Zhang, Yawei Qin, Jin-Yong Dong

{"title":"Copolymerization of ω-Alkenyltrimethylsilane/Propylene with Heterogeneous Ziegler-Natta Catalyst: How Dose Alkenyl Length Affect Comonomer Incorporation?","authors":"Fengtao Chen, Zhijian Zhang, Yawei Qin, Jin-Yong Dong","doi":"10.1002/mren.202300004","DOIUrl":"10.1002/mren.202300004","url":null,"abstract":"Three ω-alkenyltrimethylsilanes of different alkenyl moieties, i.e., 3-butenyltrimethylsilane, 5-hexenyltrimethylsilane, and 7-octenyltrimethylsilane, are copolymerized with propylene over a heterogeneous Ziegler-Natta catalyst. The experimental results reveal that, at odds with what the molecular volumes will foretell, 5-hexenyltrimethylsilane top the three ω-alkenyltrimethylsilanes in incorporation rate into PP while 3-butenyltrimethylsilane becomes the most sluggish of the three. This comonomer incorporation rate order is in line with that of ω-alkenylmethyldichlorosilanes in copolymerization with propylene-synthesizing long-chain-branched PP (LCB-PP), pointing to a peculiar alkenyl length effect on comonomer incorporation rate for these comonomers. DFT simulation is then applied to seek energetic basis in coordination-insertion for such an effect. It is revealed that complexation abilities of the three ω-alkenyltrimethylsilanes decrease in the following order: 3-butenyltrimethylsilane > 5-hexenyltrimethylsilane > 7-octenyltrimethylsilane, in line with their molecular sizes. However, the insertion energy barriers increase in the order of: 5-hexenyltrimethylsilane < 7-octenyltrimethylsilane < 3-butenyltrimethylsilane. The repulsive interaction between the bulky trimethylsilane functionality of ω-alkenyltrimethylsilanes and growing PP chain is found to contribute significantly to the insertion energy barrier, which grows disproportionally large with 3-butenyltrimethylsilane. The current discovery will be conducive to understanding the more complex ω-alkenylmethyldichlorosilane/propylene copolymerization that synthesizes the industrially important LCB-PP.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45678632","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

Evaluation of Hyperthermic Potential and Acute Toxicity of PLGA-PEG/Magnetite Microspheres Loaded with Oxaliplatin Using Mice as a Test System 以小鼠为实验系统评价载奥沙利铂的PLGA - PEG/磁铁矿微球的热电位和急性毒性

IF 1.5 4区工程技术

Macromolecular Reaction Engineering Pub Date : 2023-02-25 DOI: 10.1002/mren.202300005

Emiliane Daher Pereira, Fernando Gomes de Souza Junior, José Carlos Pinto, Sergio Thode Filho, Kaushik Pal, Alexandre dos Santos Pyrrho, Renata Cerruti da Costa, Bruno Pereira da Cunha, Fabíola da Silveira Maranhão, Thuanny Moraes de Almeida

{"title":"Evaluation of Hyperthermic Potential and Acute Toxicity of PLGA-PEG/Magnetite Microspheres Loaded with Oxaliplatin Using Mice as a Test System","authors":"Emiliane Daher Pereira, Fernando Gomes de Souza Junior, José Carlos Pinto, Sergio Thode Filho, Kaushik Pal, Alexandre dos Santos Pyrrho, Renata Cerruti da Costa, Bruno Pereira da Cunha, Fabíola da Silveira Maranhão, Thuanny Moraes de Almeida","doi":"10.1002/mren.202300005","DOIUrl":"10.1002/mren.202300005","url":null,"abstract":"Oxaliplatin and modified magnetic nanoparticles (magnetite-lysine) are inserted into microspheres of previously synthesized poly(lactic acid-co-glycolic acid-b-ethylene glycol) PLGA-PEG to evaluate the in vitro hyperthermal potential and the acute toxicity in mice. The used nanoparticles are synthesized by the coprecipitation method, using Fe II and Fe III, and modification with lysine is performed during the synthesis. The drug and the magnetic nanoparticles are inserted into the polymer beads through oil in water (O/W) emulsion. The obtained composites are then characterized by Fourier-transform infrared (FTIR), Thermogravimetric analysis (TGA), X-ray Diffraction (XRD), and submitted to magnetic hyperthermia and acute toxicity tests. The hyperthermia tests are conducted according to an experimental design. The magnetite-lysine nanoparticles reached the temperature for the desired application and are able to raise the temperature by 6 °C at the higher investigated current, time, and concentration conditions. According to the proposed statistical study, only the test time exerted significant positive influence on the observed temperature increase, although synergies between time and concentration and between current and concentration are also significant. In vivo acute toxicity tests are also conducted with swiss mice and revealed that the prepared materials and procedures can be regarded as safe and of low toxicity.","PeriodicalId":18052,"journal":{"name":"Macromolecular Reaction Engineering","volume":"17 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47255389","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