MACROTHIOLS THROUGH FREE RADICAL CHAIN TRANSFER: SYNTHESIS, KINETICS, AND APPLICATION IN BLOCK COPOLYMER SYNTHESIS

1999 ◽  
Vol 36 (1) ◽  
pp. 51-72 ◽  
Author(s):  
C. P. Reghunadhan Nair ◽  
P. Sivadasan ◽  
V. P. Balagangadharan
Keyword(s):  
Free Radical ◽  
Block Copolymer ◽  
Chain Transfer ◽  
Radical Chain

Electron Transference in Free Radical Chain Transfer Reactions

Nature ◽  
1964 ◽  
Vol 202 (4933) ◽  
pp. 690-691 ◽  
Author(s):  
JAY K. KOCHI ◽  
DENNIS D. DAVIS
Keyword(s):  
Free Radical ◽  
Chain Transfer ◽  
Transfer Reactions ◽  
Radical Chain

scholarly journals Equilibrium and Nonequilibrium Nanoscale Ordering of Polystyrene-b-poly(N,N′-diethylaminoethyl methacrylate), a Block Copolymer Carrying Tertiary Amine Functional Groups

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Pedro Navarro-Vega ◽  
Arturo Zizumbo-López ◽  
Angel Licea-Claverie ◽  
Alejandro Vega-Rios ◽  
Francisco Paraguay-Delgado
Keyword(s):  
Thin Films ◽  
Gold Nanoparticles ◽  
Free Radical ◽  
Block Copolymer ◽  
Radical Polymerization ◽  
Tertiary Amine ◽  
Chain Transfer ◽  
Uv Light ◽  
Mica Substrate ◽  
The Core

Poly(styrene)-b-poly(N,N′-diethylaminoethyl methacrylate) (PS-b-PDEAEM) block copolymer was synthesized by RAFT free-radical polymerization using a trithiocarbonate type of chain transfer agent (CTA). Several block copolymer compositions were achieved maintaining low polydispersities by using PS as macro-CTA in the first step. Thin films of PS60%-b-PDEAEM40%were deposited over mica substrate, and its equilibrium and nonequilibrium nanostructures were studied. Lamellar (equilibrium), bicontinuous (nonequilibrium) and detached nanoflakes (nonequilibrium), were obtained by using different annealing methods. Mixing nanocomposites of gold nanoparticles/PDEAEM in the block copolymer resulted in the formation of toroidal nanostructures confining gold nanoparticles to the core of those nanostructures. The same toroidal nanostructure was achieved by different annealing methods, including irradiation with UV light for 15 min. Electron micrographs show clearly this different type of arrays.

scholarly journals THE STRUCTURE OF BUTADIENE DIMERS PRODUCED BY A FREE-RADICAL CHAIN-TRANSFER MECHANISM

1957 ◽  
Vol 35 (12) ◽  
pp. 1467-1474 ◽  
Author(s):  
L. J. Gendron ◽  
R. V. V. Nicholls
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Chain Transfer ◽  
Transfer Mechanism ◽  
The Other ◽  
Chain Transfer Agent ◽  
Radical Chain

Butadiene was dimerized by using acetyl peroxide as source of free radicals and chloroform as solvent and chain-transfer agent. The dimers were identified and their structures were determined by means of ozonolysis and oxidative hydrolysis. It was established that two dimers were produced in nearly equal amount. One dimer was formed only by 1,4-additions, the other only by 1,2-additions. This result implies that polybutadienes may be mixtures of two varieties: one variety resulting from 1,4-additions, the other from 1,2-additions.

Isotopic Investigation of Hydrogen Transfer Related to Cobalt-Catalyzed Free-Radical Chain Transfer

1996 ◽  
Vol 15 (24) ◽  
pp. 5116-5126 ◽  
Author(s):  
Alexei A. Gridnev ◽  
Steven D. Ittel ◽  
Bradford B. Wayland ◽  
Michael Fryd
Keyword(s):  
Free Radical ◽  
Hydrogen Transfer ◽  
Chain Transfer ◽  
Radical Chain ◽  
Isotopic Investigation
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