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@ARTICLE{Hertle:201055,
author = {Hertle, Yvonne and Zeiser, Michael and Hasenöhrl,
Christoph and Busch, Peter and Hellweg, Thomas},
title = {{R}esponsive {P}({NIPAM}-co-{N}t{BAM}) microgels:
{F}lory–{R}ehner description of the swelling behaviour},
journal = {Colloid $\&$ polymer science},
volume = {288},
number = {10-11},
issn = {1435-1536},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2015-03365},
pages = {1047 - 1059},
year = {2010},
abstract = {In the present work, a systematic series of
poly(N-isopropylacrylamide)(NIPAM)
–poly(N-tert-butylacrylamide) (NtBAM) copolymer microgels
is prepared by surfactant-free emulsion polymerisation using
N,N′-methylenebis(acrylamide) (BIS) as cross-linker. The
thermoresponsive behaviour of these colloids was studied in
detail applying different scattering techniques. The
swelling curves obtained on the basis of photon correlation
spectroscopy (PCS) are analysed using the theoretical model
of Flory and Rehner. The PCS measurements reveal the narrow
particle size distribution of the poly(NIPAM-co-NtBAM)
microgels and a decreasing hydrodynamic radius as well as a
decreasing volume phase transition temperature (VPTT) with
increasing comonomer content. The description of the
swelling ratio α as a function of temperature by the
Flory–Rehner theory for uncharged homopolymer gels was
only partially satisfying and fails for higher comonomer
contents. In addition, small angle neutron scattering (SANS)
is used to study the internal network structure of these
microgels, and the polymer network is characterised in terms
of the correlation length ξ. Above the transition
temperature, only interfacial scattering from the totally
collapsed particles in water can be observed. Due to a
certain surface roughness of the copolymer microgels, the
SANS profiles beyond the VPTT were fitted using a modified
Porod law.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
JCNS-2},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106},
pnm = {54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000279214700001},
doi = {10.1007/s00396-010-2232-8},
url = {https://juser.fz-juelich.de/record/201055},
}