Journal Article

FZJ-2015-05069

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Evolution of Size and Structure during the Polymerization Process: A SANS Study on EG-Based Microgels

Wellert, S. (Corresponding author) ; Radulescu, A.FZJ* ; Carl, A. ; Klitzing, R. v. ; Gawlitza, K. (Corresponding author)

2015
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.macromol.5b00686

Abstract: The present study describes the temporary evolution of size and morphology of thermosensitive and biocompatible microgel particles based on ethylene glycol (EG). P-MeO2MA-co-OEGMA particles were synthesized by precipitation polymerization. The growth of the microgel particles was analyzed at different reaction times using dynamic light scattering (DLS) and small-angle neutron scattering (SANS). The scattering data show the increase of particle size and swelling capability during the polymerization process. After 60 min further continuation of the polymerization reaction causes no further change of neither external nor internal particle properties. SANS measurements reveal the formation of a dense core, mainly consisting of cross-linker at an early polymerization state. This is followed by the growth of a loosely packed polymer shell. Nanodomains, observed during the volume phase transition (VPT), as well as a second correlation-length of the network fluctuations arise with progressing polymerization reaction related to the buildup of the shell.

Keyword(s): Health and Life (1st) ; Health and Life (1st) ; Soft Condensed Matter (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. KWS-2: Small angle scattering diffractometer (NL3ao)

Appears in the scientific report 2015

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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