Article
Biochemistry & Molecular Biology
Sina Sharifi, Mohammad Mirazul Islam, Hannah Sharifi, Rakibul Islam, Tahmida N. Huq, Per H. Nilsson, Tom E. Mollnes, Khoa D. Tran, Corrina Patzer, Claes H. Dohlman, Hirak K. Patra, Eleftherios I. Paschalis, Miguel Gonzalez-Andrades, James Chodosh
Summary: Electron beam irradiation is an effective method for sterilizing medical devices made of PMMA, with minimal impact on its chemical properties. Mechanical and optical properties of PMMA remain largely unaffected at 25 kGy, but show slight reduction at 50 kGy. E-beam irradiation decreases surface roughness of PMMA in a dose-dependent manner, while maintaining good biocompatibility up to 50 kGy.
MACROMOLECULAR BIOSCIENCE
(2021)
Article
Polymer Science
Jun Zhong, Xinyue Zhang, Xiaofeng Yu, Xuanyu Shi, Shihao Sun, Li Yang, Min Zuo, Yihu Song, Qiang Zheng
Summary: The selective distribution of silica nanoparticles grafted with crosslinked PMMA in PMMA/SAN blend was studied. Highly crosslinked PMMA chains mainly located in the PMMA-rich domains, while linear PMMA chains mainly located at the blend matrix interface. NPs grafted with slightly crosslinked chains were partially located at the interface and partially in the PMMA-rich domains. The deviation between theoretical prediction and actual location of modified NPs may be related to the heterogeneity of miniemulsion polymerization. The different locations of modified NPs induced by different grafted chain structures can result in various compatibilization effects on PMMA/SAN blend.
Article
Materials Science, Multidisciplinary
Alireza Farazin, Alireza Shakeri, Hossein Mahdavi
Summary: In this study, an amphiphilic block copolymer suitable for modification of forward osmosis (FO) membrane support layers was synthesized using the ATRP method. The addition of this copolymer significantly improved the performance of the support layer, and the best performing membrane exhibited satisfactory FO performance.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Anatomy & Morphology
Maria Cecilia Salvadori, Fernanda de Sa Teixeira, Mauro Cattani, Ian G. Brown
Summary: Nanocomposites formed by self-assembling metal nanoparticles in an insulator matrix have great technological importance in various applications. This study focused on nanocomposites formed by low energy ion implantation of gold and platinum nanoparticles into PMMA, analyzing the nanoparticle evolution based on implantation dose. The results revealed substantial differences in formation processes between Au-PMMA and Pt-PMMA nanocomposites, providing crucial insights for design applications.
MICROSCOPY RESEARCH AND TECHNIQUE
(2021)
Article
Polymer Science
Hyeyoung Park, Martin Wiesing, Philipp Zimmermann, Andreas Janke, Simona Schwarz, Jurgen Nagel
Summary: This article investigates a new approach for functionalizing a surface by using a conventional laser to generate chemical activation. By optimizing laser parameters, poly(ethyleneimine) (PEI) was successfully grafted onto poly(methyl methacrylate) (PMMA) and the modified surface was characterized and analyzed.
Article
Polymer Science
Hamza Mahmoud Aboelanin, Stepan Podzimek, Vladimir Spacek
Summary: This study focuses on the detailed characterization of the molecular structure and dilute solution properties of highly dense star-like polymers of poly(methyl methacrylate) and poly(n-butyl methacrylate). The comparison of refractive index increment with corresponding linear homopolymers was conducted. The prepared polymers were characterized using size exclusion chromatography, multi-angle light scattering detector, and online viscometer. The obtained data allowed for the determination of arm distribution, average number of arms per molecule, and molar mass dependency of the draining factor. The relation between the number of arms per molecule and molar mass was estimated and compared with true values.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Xinyue Zhang, Haimo Zhang, Min Zuo, Jun Zhong, Xuanyu Shi, Shihao Sun, Li Yang, Yihu Song, Qiang Zheng
Summary: The effect of selective distribution and migration behavior of two types of modified nanoclays on the phase behavior of PMMA/SAN blends is investigated. The different grafting density and chain lengths result in different initial locations and subsequent migration behaviors of the nanoclays. The dense and short chain nanosheets are distributed at the interfacial region and form percolation networks, significantly blocking the concentration fluctuation and domain coarsening. The sparse and long chain nanosheets are initially distributed in the SAN-rich domains and slowly migrate to the interfacial region, inhibiting phase separation and stabilizing the morphology.
Article
Polymer Science
Yu-Liang Lin, Song-Yu Tsai, Hung-Chieh He, Lin-Ruei Lee, Jhih-Hao Ho, Chien-Lung Wang, Jiun-Tai Chen
Summary: This study fabricated sc-PMMA nanorods using various pore sizes AAO templates to investigate its crystallization behavior under nanoconfinement. The results show that the crystallization kinetics of sc-PMMA inside nanopores differs significantly from the bulk state, and the preferred orientation of sc-PMMA crystallites is mainly influenced by the degree of spatial confinement and the polymer molecular weight. This work provides a deeper understanding of sc-PMMA under nanoconfinement and offers opportunities for the applications of supramolecular nanostructures in miniaturized devices.
Article
Chemistry, Organic
Yoshihiko Morimoto, Takuya Kochi, Fumitoshi Kakiuchi
Summary: A new catalytic system was developed for the anti-Markovnikov hydroamination of both aliphatic and aromatic terminal alkynes with primary amines, yielding high amounts of aldimines and enamines. This system exhibited high functional group tolerance, including hydroxy, bromo, cyano, and thioester groups.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Gnana Saurya Vankayalapati, Ethan Kaplan, Lisa M. Lallo, Nikhil Victor, Craig M. Clemons, John M. Considine, Kevin T. Turner
Summary: Cellulose nanofibrils (CNFs) show promise as reinforcements for polymer fibers, enhancing their strength, stiffness, and fracture toughness. Composite fibers of Poly(methyl methacrylate) (PMMA) and CNFs with varied CNF content were successfully fabricated, leading to significant improvements in mechanical properties. The addition of low-weight fractions of CNFs resulted in increased Young's modulus, yield strength, and fracture toughness in the composite fibers.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Organic
Fanni Bede, Laszlo Kollar, Nandor Lambert, Peter Huszthy, Peter Pongracz
Summary: Palladium-catalyzed hydroaminocarbonylation reactions of olefins using aliphatic amines were successfully performed under carbon monoxide atmosphere. The targeted amides were synthesized in moderate to good isolated yields without the need for acidic additives. The effect of chiral diphosphines on product distribution, including chemo-, regio-, and enantioselectivities, was also investigated.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Glendimar Molero, Cong Liu, Zewen Zhu, Qihui Chen, Suzanne R. Peterson, Pavan Kolluru, Hung-Jue Sue, Shuntaro Uenuma, Koichi Mayumi, Kohzo Ito
Summary: The fracture behavior of polyrotaxane (PR)-modified poly(methyl methacrylate) (PMMA) was investigated. By adding only 1 wt % of PR to the PMMA matrix, substantial improvement in fracture toughness was achieved while maintaining modulus and transparency. The interaction between PR and PMMA contributes to higher molecular mobility and enhanced molecular cooperativity, leading to the formation of massive crazing and improved fracture toughness.
Article
Chemistry, Physical
Tejas Sharma, Burak Gultekin, Pawan Singh Dhapola, N. G. Sahoo, Sushant Kumar, Daksh Agarwal, H. K. Jun, Diksha Singh, Gaurav Nath, Pramod K. Singh, Abhimanyu Singh
Summary: A polymer electrolyte based on PMMA doped with IL was synthesized using solution cast method. The addition of IL increased the ionic conductivity and conductivity maximum. Various characterization techniques were used to analyze the properties of the developed IL-doped polymer electrolyte films. The optimized electrolyte was used in the fabrication of a supercapacitor and a dye-sensitized solar cell, showing good electrochemical performance.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Chemical
Haifeng Zhang, Chungang Dong, Xiangyan Han, Yuanyuan Han, Fengyang Zhao, Nan Yan, Yuexin Hu, Guiyan Zhao
Summary: Poly(butyleneadipate-co-terephthalate) (PBAT) was used to toughen poly(lactic acid) (PLA) with the addition of poly(methyl methacrylate)-poly(butyl acrylate)-poly(methyl methacrylate) (MAM) through melt blending. The impact toughness and tensile toughness of the PLA/PBAT/MAM ternary blends were greatly enhanced when the MAM content was higher than 5%. The synergistic toughening effect of MAM and PBAT on PLA was observed, improving the compatibility and interfacial adhesion between PLA and PBAT, thus significantly enhancing the overall mechanical properties of PLA blends.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Polymer Science
Naruki Kurokawa, Fuyuaki Endo, Kenta Bito, Tomoki Maeda, Atsushi Hotta
Summary: The study focused on solidifying PMEA through copolymerization with PMMA to enhance coating stability, while also expanding PMEA's application range. The new triblock copolymers demonstrated excellent antithrombogenic properties and improved tensile strength compared to previous studies on solidified PMEA.
Article
Chemistry, Multidisciplinary
A. A. Kaltenberg, A. M. Penkal', N. Somov, I. D. Grishin
RUSSIAN CHEMICAL BULLETIN
(2019)
Article
Chemistry, Inorganic & Nuclear
Anastasiya M. Penkal', Nikolay V. Somov, Ekaterina S. Shchegravina, Ivan D. Grishin
JOURNAL OF CLUSTER SCIENCE
(2019)
Article
Chemistry, Inorganic & Nuclear
T. Balashova, E. Baranov, G. K. Fukin, V. A. Ilichev, I. D. Grishin, A. N. Yablonskiy, B. A. Andreev, M. N. Bochkarev
RUSSIAN JOURNAL OF COORDINATION CHEMISTRY
(2019)
Article
Polymer Science
Sergey A. Stakhi, Dmitry F. Grishin, Ivan D. Grishin
POLYMER SCIENCE SERIES B
(2020)
Article
Chemistry, Inorganic & Nuclear
Alexander A. Kaltenberg, Nikolay Somov, Yulia B. Malysheva, Nadezhda A. Knyazeva, Alexander Piskunov, Ivan D. Grishin
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2020)
Article
Polymer Science
Dimitry F. Grishin, Oksana S. Lizyakina, Luydmila B. Vaganova, Alexander A. Kaltenberg, Ivan D. Grishin
Summary: The polymerization of methyl methacrylate under visible light conditions using methylene blue as a photocatalyst and bromine-containing organic compounds was investigated. The nature of the light source, initiator structure, and additional reagents all play a role in determining polymerization rate and molecular weight parameters. Electron-donating additives can accelerate the polymerization process, leading to a linear increase in molecular weight of samples with conversion growth.
IRANIAN POLYMER JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Alexander A. Kaltenberg, Nikolay Somov, Yulia B. Malysheva, Dmitry L. Vorozhtsov, Ivan D. Grishin
Summary: The reaction between a known closo-ruthenacarborane and tridentade nitrogen-based ligands resulted in the isolation of novel ruthenacarborane clusters with unique characteristics. While the compounds exhibited pseudocloso structure in solid state, some of them converted into closo isomers in solution, as indicated by B-11{H-1} NMR spectra. Quantum-chemical calculations and electrochemical investigations provided insights into the delicate differences between configurations and reactivity of the formed ruthenacarboranes.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Polymer Science
Sergey A. Stakhi, Dmitry F. Grishin, Ivan D. Grishin
Summary: A novel approach for ARGET ATRP was proposed using two copper complexes simultaneously to increase polymerization rate of acrylonitrile and obtain high molecular weight polymers. Electrochemical studies revealed a tandem catalysis mechanism with one complex acting as activator and the other deactivating polymer chain. The system showed potential for obtaining well-defined copolymers using low copper concentrations.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Chemistry, Applied
Tatyana V. Balashova, Svetlana K. Polyakova, Vasily A. Ilichev, Andrey A. Kukinov, Roman V. Rumyantcev, Georgy K. Fukin, Ivan D. Grishin, Artem N. Yablonskiy, Alexander F. Shestakov, Mikhail N. Bochkarev
Summary: A series of Sc, Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Ho, Er, Tm and Yb complexes with oxybenzoquinoline ligands were synthesized. The structures and photo- and electroluminescent properties of these complexes were studied in solutions and solid state. The complexes exhibited ligand-centered and metal-centered luminescence in both solutions and solid state.
JOURNAL OF RARE EARTHS
(2023)
Article
Engineering, Environmental
Alyona N. Pochina, Evgeniia V. Salomatina, Alexander V. Knyazev, Anastasia S. Shipilova, Lydia N. Ivashkina, Ekaterina V. Bobrina, Ivan D. Grishin, Kristina V. Apryatina, Alla E. Mochalova
Summary: The copolymerization of N,N-dimethylaminoethyl methacrylate (DMAEMA) on chitosan (CTS) using ultrasonic irradiation was studied, and copolymers with different compositions and properties of CTS-graft-poly(DMAEMA) were obtained.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Chemistry, Inorganic & Nuclear
Anastasiya M. Zimina, Nikolay V. Somov, Yulia B. Malysheva, Nadezhda A. Knyazeva, Alexander V. Piskunov, Ivan D. Grishin
Summary: A class of POP ligands, known for their unique properties, have shown great potential in the field of coordination chemistry for their application in catalytic polymerization. Two new approaches to synthesize ruthenacarboranes with POP ligands were developed, and the synthesized complexes were characterized by various spectroscopic and crystallographic techniques. The electrochemical studies demonstrated the reversible nature of these complexes, making them suitable for catalysis in polymerization reactions.
Article
Chemistry, Physical
Ivan D. Grishin, Elizaveta I. Zueva, Yulia S. Pronina, Dmitry F. Grishin
Summary: In this work, novel catalytic systems for Activators Generated by Electron Transfer (AGET) ATRP of acrylonitrile based on copper (II) bromide complexes were proposed. It was found that Rochelle salt (potassium sodium tartrate tetrahydrate) may be used as a reducing agent for regeneration of copper-based catalysts to increase the rate of the process. The use of a tandem catalytic system based on two copper complexes with different ligands also increases the polymerization rate, allowing for the rapid synthesis of polyacrylonitrile polymers with desired molecular weights exceeding 100 kDa.
Article
Polymer Science
Evgeniia Salomatina, Aleksander Pikulin, Dmitry Semenov, Ivan Grishin, Natalia Kirillova, Larisa Smirnova
Summary: A new method of block-copolymer synthesis using a multifunctional Si-organic chain transfer agent is presented. The method allows for a wider choice of monomers and is applicable for obtaining block copolymers with wide molecular weight distribution. The synthesis can be completed in a few hours at moderate temperatures and does not involve sulfur-based or metalorganic compounds, making it suitable for various applications. The resulting polymer molecular weight can be controlled by adjusting the concentrations of the initiator and Si-Cl-based agent.
Article
Chemistry, Multidisciplinary
Svetlana A. Lermontova, Ilya S. Grigoryev, Nina N. Peskova, Elena Yu. Ladilina, Tatyana S. Lyubova, Vladimir I. Plekhanov, Ivan D. Grishin, Irina V. Balalaeva, Larisa G. Klapshina
Article
Chemistry, Multidisciplinary
D. F. Grishin, I. D. Grishin
