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Normal ATRP (normal + atrp)

Distribution by Scientific Domains
Polymers and Materials Science100%

Selected Abstracts

Kinetic Modeling of Normal ATRP, Normal ATRP with [CuII]0, Reverse ATRP and SR&NI ATRP

MACROMOLECULAR THEORY AND SIMULATIONS, Issue 7-8 2008
Wei Tang
Abstract The kinetics of various ATRP systems, including normal ATRP, normal ATRP in the presence of initially-added CuII, reverse ATRP and SR&NI ATRP were modeled using Predici software. The instantaneous kinetic chain length was introduced for ATRP and was used for the prediction of control over polymerization. Equations were derived to estimate the radical concentration at the quasi-steady-state. Normal ATRP experiences a continuous decrease of radical concentration leading to a decrease of polymerization rate; in contrast, SR&NI ATRP undergoes a continuous increase in radical concentration, leading to an increase of the polymerization rate. All of these ATRP methods can afford a relatively fast polymerization rate and retain good polymerization control. [source]

Salt-Induced Micelle Behavior of Poly(sodium acrylate)- block -Poly(N -isopropylacrylamide) by ATRP

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 4 2008
Shuping Jin
Abstract Temperature- and pH-sensitive diblock copolymers PAANa75 - b -PNIPAMm are prepared by a combination of reverse and normal ATRP in aqueous solution at room temperature. The block copolymer is also stimuli-sensitive with respect to salt in the aqueous solution, and forms spherical star-like micelles with a PNIPAM core and an expanded PAANa shell for PAANa75 - b -PNIPAM76 as well as spherical crew-out micelles with a PNIPAM core for PAANa75 - b -PNIPAM5110, as indicated by a fluorescence probe technique and TEM. A three-stage model mechanism of phase transition driven by small molecule salt is proposed. [source]

Kinetic Modeling of Normal ATRP, Normal ATRP with [CuII]0, Reverse ATRP and SR&NI ATRP

MACROMOLECULAR THEORY AND SIMULATIONS, Issue 7-8 2008
Wei Tang
Abstract The kinetics of various ATRP systems, including normal ATRP, normal ATRP in the presence of initially-added CuII, reverse ATRP and SR&NI ATRP were modeled using Predici software. The instantaneous kinetic chain length was introduced for ATRP and was used for the prediction of control over polymerization. Equations were derived to estimate the radical concentration at the quasi-steady-state. Normal ATRP experiences a continuous decrease of radical concentration leading to a decrease of polymerization rate; in contrast, SR&NI ATRP undergoes a continuous increase in radical concentration, leading to an increase of the polymerization rate. All of these ATRP methods can afford a relatively fast polymerization rate and retain good polymerization control. [source]