Article
Polymer Science
Yi Wang, Francesca Lorandi, Marco Fantin, Krzysztof Matyjaszewski
Summary: Polymerizations in aqueous dispersed media benefit from good heat transfer, low viscosity, low content of volatile compounds, and established industrial use. The implementation of ATRP in dispersed media has highlighted the possibility of achieving improved livingness and producing a variety of macromolecular architectures. ATRP techniques employing low-ppm catalyst loadings have enabled access to a larger variety of polymer architectures and functional polymer particles, which have found applications in molecular recognition, drug delivery, bio-quantification, and advanced coatings.
Article
Materials Science, Paper & Wood
Muhammad Asif Iqbal, Toheed Akhter, Muhammad Faheem, Asif Mahmood, Waheed Al-Masry, Sohail Nadeem, Sadaf Ul Hassan, Chan Ho Park
Summary: We synthesized a thermoresponsive polymer with a narrow molecular weight distribution using organic photo-redox-catalyzed atom transfer radical polymerization (O-ATRP). The O-ATRP was mediated by a photoredox catalyst 1,2,3,5-tetrakis (carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) under visible light irradiation. The polymerization of polymethyl methacrylate (PMMA) chains from a hydroxypropyl cellulose (HPC)-based macroinitiator was characterized using various analytical methods. The resulting PMMA-grafted HPC (PMMA-g-HPC) showed a widened lower critical solution temperature (LCST) window and an inverse pH dependency of the LCST, making it promising for various applications including drug delivery systems.
Article
Polymer Science
Amrish Kumar Padmakumar, Nikhil K. Singha, Muthupandian Ashokkumar, Frank A. Leibfarth, Greg G. Qiao
Summary: Advances in nanomolecular engineering have led to the development of technology using ultrasonic irradiation to initiate polymerization. In this study, ultrasound-assisted reversible addition chain-transfer (Sono-RAFT) polymerization was used to compare batch and continuous flow polymerization methods on monomer conversion, polymer molar mass, and dispersity using different monomer substrates. Results showed that continuous flow polymerization had higher monomer conversion compared to batch reactions under the same conditions. Continuous flow reactors with stainless-steel microreactors provided higher cavitation intensity and lower oxygen contamination, making Sono-RAFT possible at higher monomer concentrations. These findings have implications for mechanochemistry and the practical and sustainable implementation of sonochemically regulated polymerization.
Article
Chemistry, Physical
Olessya P. Loiko, Johan P. A. Heuts, Alex M. van Herk
Summary: This article reports the synthesis of polymer-vesicle latex particles using extruded vesicles of DODAB via an atom transfer radical polymerization-based approach. Cryo-TEM characterization reveals that the final morphology of the particles is affected by monomer feed composition and chain length. Protrusions or nanocapsules were synthesized depending on the monomer combinations used.
COLLOID AND POLYMER SCIENCE
(2022)
Article
Polymer Science
Aurel Diacon, Edina Rusen, Florica Rizea, Adi Ghebaur, Daniela Berger, Raluca Somoghi, Andreea Matei, Petru Palade, Oana Tutunaru
Summary: The study developed an ATRP process for MMA polymerization using Fe(CO)(5) as co-initiator, demonstrating controlled characteristics and producing magnetic PMMA particles. The particles have porous characteristics and magnetic properties, making them suitable for use as catalyst supports, separation processes, or biomedical applications.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Engineering, Chemical
Hui Ye, Yining Zhou, Guodong Yang, Tengfei Yu, Yuzhong Zhang, Lizhi Zhao, Qingping Xin, Shurui Han
Summary: In this study, a pH-responsive membrane was developed for protein fractionation. The membrane successfully separated different milk proteins by controlling the pH value.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Chemical
Ki Jung Kim, Yunmi Chae, Seong Jin An, Jin Hui Jo, Sungmin Park, Won Seok Chi
Summary: This study investigates microphase-separated structured PI-POEM graft copolymer membranes, which have controllable POEM concentrations and the ability to modify material properties. The results show that PI-POEM graft copolymer membranes exhibit high CO2 affinity and separation performance, making them promising for CO2 separation processes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Polymer Science
Daniel A. Corbin, Blaine G. McCarthy, Zach van de Lindt, Garret M. Miyake
Summary: This study focused on synthesizing radical cations of photoredox catalysts for organocatalyzed ATRP to investigate deactivation mechanisms. The results showed that increasing radical cation concentrations improved polymerization control in O-ATRP.
Article
Chemistry, Multidisciplinary
Yu Wang, Sushant P. Sahu, Alec J. Clay, Amanda J. Gildersleeve
Summary: By combining nitroxide radicals and ATRP active halogens into a functional reagent, simultaneous ATRP-NRC relay polymerization was successfully achieved, allowing for tailored macromolecular architecture and functionality by using different functional reagents.
CHEMICAL COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Joseph J. Andry, Jaenic J. Lee, Jessica Wu, Katherine Xia, Eric S. Tillman
Summary: The study aims to find universal reaction conditions for different polymers to achieve high extents of coupling. By adjusting the choice of radical traps, high extents of coupling were successfully achieved for PSBr, PMABr, and PMMABr.
Review
Polymer Science
Alfred K. K. Fung, Michelle L. Coote
Summary: Atom transfer radical polymerization has become one of the most dominant methods in controlled radical polymerization since its invention 25 years ago. The rise in importance is largely due to increases in scope, reduced catalyst loading, and improved oxygen tolerance. These developments have been underpinned by an improved understanding of the mechanism, kinetics, and structure-reactivity trends.
POLYMER INTERNATIONAL
(2021)
Article
Polymer Science
Martin Cvek, Arman Moini Jazani, Julian Sobieski, Thaiskang Jamatia, Krzysztof Matyjaszewski
Summary: ZnO nanocrystals were successfully synthesized and used as a heterogeneous co-catalyst in mechano- and photoATRP. The photoATRP with ZnO exhibited faster reaction kinetics compared to mechanoATRP and did not require excess ligand. This study demonstrated the versatility and robustness of ZnO-cocatalyzed photoATRP for various monomers.
Review
Chemistry, Multidisciplinary
Ruoyu Li, Weina Kong, Zesheng An
Summary: This Minireview discusses the key roles enzymes play in reversible deactivation radical polymerization (Enz-RDRP) and highlights their applications in surface brush fabrication, sensing, polymerization-induced self-assembly, and high-throughput synthesis. The authors also reflect on the challenges and future directions of this emerging area.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Polymer Science
Lea Sollka, Karen Lienkamp
Summary: Polymeric derivatives of itaconic acid are of increasing interest due to their renewable sources. However, these derivatives have low reactivity and limited use compared to poly(methacrylates). Controlled radical polymerization techniques, such as ATRP and RAFT, have been shown to improve the reactivity and quality of these polymers.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Gianluca Gazzola, Irene Filipucci, Andrea Rossa, Krzysztof Matyjaszewski, Francesca Lorandi, Edmondo M. M. Benetti
Summary: Achieving tolerance toward oxygen is essential for the upscalable and technologically relevant processes of fabricating polymer brush-coatings. By judiciously tuning the reaction mixtures and polymerization setup, the compatibility of surface-initiated photoinduced atom transfer radical polymerization (SI-photoATRP) technique can be maximized. Through precise variation of reaction conditions, key parameters like the concentration of Cu-based catalyst and free alkyl halide initiator can be optimized to efficiently consume oxygen and yield uniform and thick brushes, even in more exposed polymerization mixtures.
