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Main Title: Inner structure and dynamics of microgels with low and medium crosslinker content prepared via surfactant-free precipitation polymerization and continuous monomer feeding approach
Author(s): Kyrey, Tetyana
Witte, Judith
Feoktystov, Artem
Pipich, Vitaliy
Wu, Baohu
Pasini, Stefano
Radulescu, Aurel
Witt, Marcus U.
Kruteva, Margarita
Klitzing, Regine von
Wellert, Stefan
Holderer, Olaf
Type: Article
Abstract: The preparation of poly(N-isopropylacrylamide) microgels via classical precipitation polymerization (batch method) and a continuous monomer feeding approach (feeding method) leads to different internal crosslinker distributions, i.e., from core–shell-like to a more homogeneous one. The internal structure and dynamics of these microgels with low and medium crosslinker concentrations are studied with dynamic light scattering and small-angle neutron scattering in a wide q-range below and above the volume phase transition temperature. The influence of the preparation method, and crosslinker and initiator concentration on the internal structure of the microgels is investigated. In contrast to the classical conception where polymer microgels possess a core–shell structure with the averaged internal polymer density distribution within the core part, a detailed view of the internal inhomogeneities of the PNIPAM microgels and the presence of internal domains even above the volume phase transition temperature, when polymer microgels are in the deswollen state, are presented. The correlation between initiator concentration and the size of internal domains that appear inside the microgel with temperature increase is demonstrated. Moreover, the influence of internal inhomogeneities on the dynamics of the batch- and feeding-microgels studied with neutron spin-echo spectroscopy is reported.
Subject(s): PNIPAM
internal structure
volume phase transition
Issue Date: 17-Jul-2019
Date Available: 19-Aug-2019
Language Code: en
DDC Class: 541 Physikalische Chemie
Sponsor/Funder: TU Berlin, Open-Access-Mittel - 2019
Journal Title: Soft Matter
Publisher: Royal Society of Chemistry
Volume: 15
Issue: 32
Publisher DOI: 10.1039/C9SM01161G
Page Start: 6536
Page End: 6546
EISSN: 1744-6848
ISSN: 1744-683X
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Chemie
Appears in Collections:Technische Universität Berlin » Publications

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