Reversible Catalyst Supporting via Hydrogen-Bonding-Mediated Self-Assembly for Atom Transfer Radical Polymerization of MMA

2004 ◽  
Vol 37 (5) ◽  
pp. 1728-1734 ◽  
Author(s):  
Jun Yang ◽  
Shijie Ding ◽  
Maciej Radosz ◽  
Youqing Shen
Keyword(s):  
Hydrogen Bonding ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Self Assembly ◽  
Atom Transfer

The study of synthesis of poly(ethylene oxide)-b-poly(N,Ndimethylacrylamide) by atom transfer radical polymerization and self-assembly in selective solvents

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Yang Runmiao ◽  
Shi Ronghua ◽  
Zhou Dan ◽  
Wang Yanmei ◽  
Han Yanchun
Keyword(s):  
Ethylene Oxide ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Self Assembly ◽  
Copolymer Composition ◽  
Atom Transfer ◽  
Nmr Studies ◽  
Selective Solvents ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

AbstractPoly(ethylene oxide)-b-poly(N, N-dimethylacrylamide) (PEO-b-PDMA) was synthesized by successive atom transfer radical polymerization (ATRP) of N,N-dimethylacrylamide (DMA) monomer using PEO-Br macro initiators as initiator, CuBr and 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazamacrocyclotetra decane (Me6[14]aneN4) as catalyst and ligand.PEO-Br macroinitiator was synthesized by esterification of PEO with 2-bromoisobutyryl bromide. GPC and 1H NMR studies show that the plot of ln([DMA]0/[DMA]) against the reaction time is linear, and the molecular weight of the resulting PDMA increased linearly with the conversion. Within 3 h, the polymerization can reach almost 60% of conversion. PEO-b-PDMA copolymer with low polydispersity index (Mw/Mn≈1.1) is obtained. Self-assembly of PEO-b-PDMA in selective solvents is also studied. It could self-assemble into micelles in methanol/acetone (1/10, v/v) solution. TEM analyses of the PEO-b- PDMA micelles with narrow size distribution revealed that their size and shape depend much on the copolymer composition.

scholarly journals Self-assemblies of γ-CDs with pentablock copolymers PMA-PPO-PEO-PPO-PMA and endcapping via atom transfer radical polymerization of 2-methacryloyloxyethyl phosphorylcholine

2015 ◽  
Vol 11 ◽  
pp. 2267-2277 ◽  
Author(s):  
Jing Lin ◽  
Tao Kong ◽  
Lin Ye ◽  
Ai-ying Zhang ◽  
Zeng-guo Feng
Keyword(s):  
Crystal Structure ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Self Assembly ◽  
Atom Transfer ◽  
Single Chain ◽  
H Nmr ◽  
Pentablock Copolymers ◽  
Dsc Analyses ◽  
Pass Through

Pentablock copolymers PMA-PPO-PEO-PPO-PMA synthesized via atom transfer radical polymerization (ATRP) were self-assembled with varying amounts of γ-CDs to prepare poly(pseudorotaxanes) (PPRs). When the concentration of γ-CDs was lower, the central PEO segment served as a shell of the micelles and was preferentially bent to pass through the γ-CD cavity to construct double-chain-stranded tight-fit PPRs characterized by a channel-like crystal structure. With an increase in the amount of γ-CDs added, they began to accommodate the poly(methyl acrylate) (PMA) segments dissociated from the core of the micelles. When more γ-CDs were threaded and slipped over the segments, the γ-CDs were randomly distributed along the pentablock copolymer chain to generate single-chain-stranded loose-fit PPRs and showed no characteristic channel-like crystal structure. All the self-assembly processes of the pentablock copolymers resulted in the formation of hydrogels. After endcapping via in situ ATRP of 2-methacryloyloxyethyl phosphorylcholine (MPC), these single-chain-stranded loose-fit PPRs were transformed into conformational identical polyrotaxanes (PRs). The structures of the PPRs and PRs were characterized by means of 1H NMR, GPC, 13C CP/MAS NMR, 2D 1H NOESY NMR, FTIR, WXRD, TGA and DSC analyses.

Excimer Emission from Self-Assembly of Fluorescent Diblock Copolymer Prepared by Atom Transfer Radical Polymerization

2010 ◽  
Vol 22 (15) ◽  
pp. 4426-4434 ◽  
Author(s):  
Jungmok You ◽  
Jeong Ae Yoon ◽  
Jeonghun Kim ◽  
Chih-Feng Huang ◽  
Krzysztof Matyjaszewski ◽  
...  
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Atom Transfer ◽  
Excimer Emission
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