@article {1040,
	title = {Laser-light-scattering study of internal motions of polymer chains grafted on spherical latex particles},
	journal = {Journal of Physical Chemistry B},
	volume = {108},
	number = {48},
	year = {2004},
	note = {ISI Document Delivery No.: 875JUTimes Cited: 6Cited Reference Count: 35},
	month = {Dec},
	pages = {18479-18484},
	type = {Article},
	abstract = {Using atom-transfer radical polymerization, we have prepared core-shell particles by grafting thermally sensitive poly(N-isopropylacrylamide) (PNIPAM) chains on a spherical polystyrene latex core (with a radius of similar to287 nm) via the "grafting-from" approach. As the temperature increases from 25 degreesC to 35 degreesC, the PNIPAM shell shrinks from a thickness of 625 nm to 110 nm and the chain density near the core increases from 7.3 x 10(-3) g/cm(3) to 7.2 x 10(-2) g/cm(3). Using such core-shell particles, we have, for the first time, been able to study dynamics of long chains anchored on a particle in dilute dispersion by laser-light scattering. Our results showed that, besides the translational diffusion of the particle as a whole, there also exists an additional slow relaxation mode that is only observable at larger scattering vectors (q),which are presumably related to internal motions of the shell. In the fully swollen state, the relaxation rate of the slow motion (<Gamma>(slow)) is insensitive to the observation length (1/q); however, its contribution to the scattering intensity (A(slow)) increases as q increases. In the shrunken state, <Gamma>(slow) slightly decreases as q increases. <Gamma>(slow) can be scaled to the shell thickness (<L>(brush)) as <Gamma>(slow) proportional to <L>(alpha)(brush), with alpha = -2.5 +/- 0.2, which is smaller than the predicated value of 3.},
	keywords = {AQUEOUS ATRP, BRUSHES, CONFORMATION, DYNAMICS, GLOBULE TYPE TRANSITIONS, INTERFACE, LAYERS, MODEL, POLY(N-ISOPROPYLACRYLAMIDE), SIMULATION},
	isbn = {1520-6106},
	url = {<Go to ISI>://000225417200015},
	author = {Yang, C. and Kizhakkedathu, J. N. and Brooks, D. E. and Jin, F. and Wu, C.}
}
@article {909,
	title = {Synthesis and characterization of well-defined hydrophilic block copolymer brushes by aqueous ATRP},
	journal = {Polymer},
	volume = {45},
	number = {22},
	year = {2004},
	note = {ISI Document Delivery No.: 862NOTimes Cited: 27Cited Reference Count: 79},
	month = {Oct},
	pages = {7471-7489},
	type = {Article},
	abstract = {Homopolymer brushes of poly(N,N-dimethylacrylamide) (PDMA), poly(methoxyethylacrylamide) (PMEA) and poly(N-isopropylacrylamide)(PNIPAM) grown on atom transfer radical polymerization (ATRP) initiator functionalized latex particles were used as macroinitiators for the synthesis of PDMA-b-PNIPAM/PMEA, PMEA-b-PDMA/PNIPAM and PNIPAM-b-PDMA block copolymer brushes by surface initiated aqueous ATRP. The grafted homopolymer and block copolymer brushes were analyzed for molecular weight, molecular weight distribution, chain grafting density, composition and hydrodynamic thickness (HT) using gel permeation chromatography-multi-angle laser light scattering, H-1 NMR, particle size analysis and atomic force microscopy (AFM) techniques. The measured graft molecular weight increased following the second ATRP reaction in all cases, indicating the second block had been added. Chain growth depended on the nature of the monomer used for block copolymerization and its concentration. Unimodal distribution of polymer chains in GPC with non-overlap of molar mass-elution volume curves implied an efficient block copolymerization. This was supported by the increase in HT measured by particle size analysis, equilibrium thickness observed by AFM and the composition of the block copolymer layer by H-1 NMR analysis, both in situ and on cleaved chains in solution. 1H NMR analysis of the grafted latex and cleaved polymers from the surface demonstrated that accurate determination of the copolymer composition by this method is possible without detaching polymer chains from surface. Block copolymer brushes obey the same power law dependence of HT on molecular weight as homopolymer brushes in good solvent conditions. The NIPAM-containing block copolymer brushes were sensitive to changes in the environment as shown by a decrease in HT with increase in the temperature of the medium. (C) 2004 Elsevier Ltd. All rights reserved.},
	keywords = {AMBIENT-TEMPERATURE, aqueous atom transfer radical polymerization, ATOMIC-FORCE MICROSCOPY, BRUSHES, CONTROLLED GROWTH, hydrophilic diblock copolymers, LIGHT-SCATTERING, METHYL-METHACRYLATE, N-DIMETHYLACRYLAMIDE), POLY(N, POLYELECTROLYTE BRUSHES, POLYMER BRUSHES, SELF-ASSEMBLED MONOLAYERS, SIZE-EXCLUSION CHROMATOGRAPHY, TRANSFER RADICAL POLYMERIZATION},
	isbn = {0032-3861},
	url = {<Go to ISI>://000224497900011},
	author = {Kizhakkedathu, J. N. and Kumar, K. R. and Goodman, D. and Brooks, D. E.}
}
