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 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.

Reversible-deactivation radical polymerization of chloroprene and the synthesis of novel polychloroprene-based block copolymers by the RAFT approach

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55529-55538 ◽  
Author(s):  
Jia Hui ◽  
Zhijiao Dong ◽  
Yan Shi ◽  
Zhifeng Fu ◽  
Wantai Yang
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Radical Polymerization ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
Reversible Deactivation ◽  
Raft Agent ◽  
Reversible Deactivation Radical Polymerization

Novel, well-defined PCP-based block copolymers (PSt-b-PCP and PMMA-b-PCP) with controlled number averaged molecular weights and molecular weight distributions can be prepared, employing EPDTB and CPDB, respectively, as the initial RAFT agent.

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.

scholarly journals One-Step Photocontrolled Polymerization-Induced Self-Assembly (Photo-PISA) by Using In Situ Bromine-Iodine Transformation Reversible-Deactivation Radical Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 150 ◽  
Author(s):  
Haihui Li ◽  
Qinghua Xu ◽  
Xiang Xu ◽  
Lifen Zhang ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Self Assembly ◽  
Solid Content ◽  
Transition Metal Catalysts ◽  
Water Soluble ◽  
Step Method ◽  
Reversible Deactivation ◽  
One Step ◽  
Reversible Deactivation Radical Polymerization

Polymerization-induced self-assembly (PISA) has become an effective strategy to synthesize high solid content polymeric nanoparticles with various morphologies in situ. In this work, one-step PISA was achieved by in situ photocontrolled bromine-iodine transformation reversible-deactivation radical polymerization (hereinafter referred to as Photo-BIT-RDRP). The water-soluble macroinitiator precursor α-bromophenylacetate polyethylene glycol monomethyl ether ester (mPEG1k-BPA) was synthesized in advance, and then the polymer nanomicelles (mPEG1k-b-PBnMA and mPEG1k-b-PHPMA, where BnMA means benzyl methacrylate and HPMA is hydroxypropyl methacrylate) were successfully formed from a PISA process of hydrophobic monomer of BnMA or HPMA under irradiation with blue LED light at room temperature. In addition, the typical living features of the photocontrolled PISA process were confirmed by the linear increase of molecular weights of the resultant amphiphilic block copolymers with monomer conversions and narrow molecular weight distributions (Mw/Mn < 1.20). Importantly, the photocontrolled PISA process is realized by only one-step method by using in situ photo-BIT-RDRP, which avoids the use of transition metal catalysts in the traditional ATRP system, and simplifies the synthesis steps of nanomicelles. This strategy provides a promising pathway to solve the problem of active chain end (C-I) functionality loss in two-step polymerization of BIT-RDRP.

scholarly journals Ultra-High Molecular Weights via Aqueous Reversible-Deactivation Radical Polymerization

Chem ◽  
2017 ◽  
Vol 2 (1) ◽  
pp. 93-101 ◽  
Author(s):  
R. Nicholas Carmean ◽  
Troy E. Becker ◽  
Michael B. Sims ◽  
Brent S. Sumerlin
Keyword(s):  
Radical Polymerization ◽  
Molecular Weights ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization

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
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