Inner structure and dynamics of microgels with low and medium crosslinker content prepared via surfactant-free precipitation polymerization and continuous monomer feeding approach

dc.contributor.authorKyrey, Tetyana
dc.contributor.authorWitte, Judith
dc.contributor.authorFeoktystov, Artem
dc.contributor.authorPipich, Vitaliy
dc.contributor.authorWu, Baohu
dc.contributor.authorPasini, Stefano
dc.contributor.authorRadulescu, Aurel
dc.contributor.authorWitt, Marcus U.
dc.contributor.authorKruteva, Margarita
dc.contributor.authorKlitzing, Regine von
dc.contributor.authorWellert, Stefan
dc.contributor.authorHolderer, Olaf
dc.date.accessioned2019-08-19T14:04:36Z
dc.date.available2019-08-19T14:04:36Z
dc.date.issued2019-07-17
dc.description.abstractThe 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.en
dc.description.sponsorshipTU Berlin, Open-Access-Mittel - 2019en
dc.identifier.eissn1744-6848
dc.identifier.issn1744-683X
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/9821
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-8842
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by-nc/3.0/en
dc.subject.ddc541 Physikalische Chemiede
dc.subject.otherPNIPAMen
dc.subject.othermicrogelen
dc.subject.otherinternal structureen
dc.subject.othercrosslinkeren
dc.subject.othervolume phase transitionen
dc.subject.otherdynamicsen
dc.titleInner structure and dynamics of microgels with low and medium crosslinker content prepared via surfactant-free precipitation polymerization and continuous monomer feeding approachen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/C9SM01161Gen
dcterms.bibliographicCitation.issue32en
dcterms.bibliographicCitation.journaltitleSoft Matteren
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistryen
dcterms.bibliographicCitation.originalpublisherplaceLondonen
dcterms.bibliographicCitation.pageend6546en
dcterms.bibliographicCitation.pagestart6536en
dcterms.bibliographicCitation.volume15en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Chemiede
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.instituteInst. Chemiede
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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