scholarly journals ABC-Type Triblock Copolyacrylamides via Copper-Mediated Reversible Deactivation Radical Polymerization

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 116
Author(s):  
Fehaid M. Alsubaie ◽  
Othman Y. Alothman ◽  
Hassan Fouad ◽  
Abdel-Hamid I. Mourad
Keyword(s):  
Radical Polymerization ◽  
Triblock Copolymers ◽  
Side Reaction ◽  
Side Reactions ◽  
One Pot ◽  
Functional Monomers ◽  
Reversible Deactivation ◽  
Living Nature ◽  
Reversible Deactivation Radical Polymerization ◽  
High Degree

The aqueous Cu(0)-mediated reversible deactivation radical polymerization (RDRP) of triblock copolymers with two block sequences at 0.0 °C is reported herein. Well-defined triblock copolymers initiated from PHEAA or PDMA, containing (A) 2-hydroxyethyl acrylamide (HEAA), (B) N-isopropylacrylamide (NIPAM) and (C) N, N-dimethylacrylamide (DMA), were synthesized. The ultrafast one-pot synthesis of sequence-controlled triblock copolymers via iterative sequential monomer addition after full conversion, without any purification steps throughout the monomer additions, was performed. The narrow dispersities of the triblock copolymers proved the high degree of end-group fidelity of the starting macroinitiator and the absence of any significant undesirable side reactions. Controlled chain length and extremely narrow molecular weight distributions (dispersity ~ 1.10) were achieved, and quantitative conversion was attained in as little as 52 min. The full disproportionation of CuBr in the presence of Me6TREN in water prior to both monomer and initiator addition was crucially exploited to produce a well-defined ABC-type triblock copolymer. In addition, the undesirable side reaction that could influence the living nature of the system was investigated. The ability to incorporate several functional monomers without affecting the living nature of the polymerization proves the versatility of this approach.

scholarly journals Facile Synthesis of Hydrophilic Homo-Polyacrylamides via Cu(0)-Mediated Reversible Deactivation Radical Polymerization

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1947
Author(s):  
Fehaid M. Alsubaie ◽  
Othman Y. Alothman ◽  
Basheer A. Alshammari ◽  
Hassan Fouad
Keyword(s):  
Radical Polymerization ◽  
Water Soluble ◽  
Side Reactions ◽  
Controlled Polymerization ◽  
Molecular Weights ◽  
Linear Evolution ◽  
Copper Bromide ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization ◽  
Experimental Number

In this work, copper-mediated reversible deactivation radical polymerization (RDRP) of homo-polyacrylamides was conducted in aqueous solutions at 0.0 °C. Various degrees of polymerization (DP = 20, 40, 60, and 80) of well-defined water-soluble homopolymers were targeted. In the absence of any significant undesirable side reactions, the dispersity of polydiethylacrylamide (PDEA) and polydimethylacrylamide (PDMA) was narrow under controlled polymerization conditions. To accelerate the polymerization rate, disproportionation of copper bromide in the presence of a suitable ligand was performed prior to polymerization. Full conversion of the monomer was confirmed by nuclear magnetic resonance (NMR) analysis. Additionally, the linear evolution of the polymeric chains was established by narrow molecular weight distributions (MWDs). The values of theoretical and experimental number average molecular weights (Mn) were calculated, revealing a good matching and robustness of the system. The effect of decreasing the reaction temperature on the rate of polymerization was also investigated. At temperatures lower than 0.0 °C, the controlled polymerization and the rate of the process were not affected.

scholarly journals Determining the effect of side reactions on product distributions in RAFT polymerization by MALDI-TOF MS

2015 ◽  
Vol 6 (30) ◽  
pp. 5437-5450 ◽  
Author(s):  
Antonio Veloso ◽  
Wendy García ◽  
Amaia Agirre ◽  
Nicholas Ballard ◽  
Fernando Ruipérez ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Raft Polymerization ◽  
Side Reactions ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Product Distributions ◽  
Wide Range ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization ◽  
Tof Ms

RAFT polymerization has emerged as one of the most versatile reversible deactivation radical polymerization techniques and is capable of polymerizing a wide range of monomers under various conditions.

Photocontrolled iodine-mediated reversible-deactivation radical polymerization with a semifluorinated alternating copolymer as the macroinitiator

2020 ◽  
Vol 11 (47) ◽  
pp. 7497-7505
Author(s):  
Jiannan Cheng ◽  
Kai Tu ◽  
Enjie He ◽  
Jinying Wang ◽  
Lifen Zhang ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Radical Polymerization ◽  
Room Temperature ◽  
Blue Led ◽  
Led Light ◽  
Alternating Copolymers ◽  
Alternating Copolymer ◽  
Reversible Deactivation ◽  
Novel Strategy ◽  
Reversible Deactivation Radical Polymerization

A novel strategy for preparing block copolymers with semifluorinated alternating copolymers as macroinitiators was established by photocontrolled iodine-mediated RDRP under irradiation with blue LED light at room temperature.

Copolymerization of simple methacrylates by Cu(0)-mediated reversible deactivation radical polymerization

2018 ◽  
Vol 51 (5) ◽  
pp. 449-459 ◽  
Author(s):  
Jongwon Choe ◽  
Woo Jung Lee ◽  
Han Gyeol Jang ◽  
Youngjoo Song ◽  
Jae Hyun Sim ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization

Hexamethylphosphoramide as a highly reactive catalyst for the reversible-deactivation radical polymerization of MMA with an in situ formed alkyl iodide initiator

2017 ◽  
Vol 8 (39) ◽  
pp. 6073-6085 ◽  
Author(s):  
Yan-an Wang ◽  
Yan Shi ◽  
Zhifeng Fu ◽  
Wantai Yang
Keyword(s):  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Alkyl Iodide ◽  
Highly Efficient ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization ◽  
Organic Catalyst

A novel and highly efficient organic catalyst for the reversible-deactivation radical polymerization (RDRP) of methyl methacrylate with anin situformed alkyl iodide initiator.

scholarly journals Tunable Quantum Photoinitiators for Radical Photopolymerization

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2694
Author(s):  
Shubhangi Shukla ◽  
Prem C. Pandey ◽  
Roger J. Narayan
Keyword(s):  
Quantum Dots ◽  
Metal Oxides ◽  
Radical Polymerization ◽  
Mechanism Of Action ◽  
Carbon Dots ◽  
Semiconductor Nanocrystals ◽  
Metal Sulfides ◽  
Cross Linking ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization

This review describes the use of nanocrystal-based photocatalysts as quantum photoinitiators, including semiconductor nanocrystals (e.g., metal oxides, metal sulfides, quantum dots), carbon dots, graphene-based nanohybrids, plasmonic nanocomposites with organic photoinitiators, and tunable upconverting nanocomposites. The optoelectronic properties, cross-linking behavior, and mechanism of action of quantum photoinitiators are considered. The challenges and prospects associated with the use of quantum photoinitiators for processes such as radical polymerization, reversible deactivation radical polymerization, and photoinduced atom transfer radical polymerization are reviewed. Due to their unique capabilities, we forsee a growing role for quantum photoinitiators over the coming years.

scholarly journals Rapid Synthesis of Well-Defined Polyacrylamide by Aqueous Cu(0)-Mediated Reversible-Deactivation Radical Polymerization

2016 ◽  
Vol 49 (2) ◽  
pp. 483-489 ◽  
Author(s):  
Glen R. Jones ◽  
Zaidong Li ◽  
Athina Anastasaki ◽  
Danielle J. Lloyd ◽  
Paul Wilson ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Rapid Synthesis ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization
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