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Main Title: Influence of network structure on the crystallization behavior in chemically crosslinked hydrogels
Author(s): Zhang, Zhenfang
Li, Qian
Yesildag, Cigdem
Bartsch, Christoph
Zhang, Xiaoyuan
Liu, Wei
Loebus, Axel
Su, Zhiqiang
Lensen, Marga C.
Type: Article
Language Code: en
Abstract: The network structure of hydrogels is a vital factor to determine their physical properties. Two network structures within hydrogels based on eight-arm star-shaped poly(ethylene glycol)(8PEG) have been obtained; the distinction between the two depends on the way in which the macromonomers were crosslinked: either by (i) commonly-used photo-initiated chain-growth polymerization (8PEG–UV), or (ii) Michael addition step-growth polymerization (8PEG–NH3). The crystallization of hydrogels is facilitated by a solvent drying process to obtain a thin hydrogel film. Polarized optical microscopy (POM) results reveal that, while in the 8PEG–UV hydrogels only nano-scaled crystallites are apparent, the 8PEG–NH3 hydrogels exhibit an assembly of giant crystalline domains with spherulite sizes ranging from 100 to 400 µm. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses further confirm these results. A model has been proposed to elucidate the correlations between the polymer network structures and the crystallization behavior of PEG-based hydrogels.
Issue Date: 1-Sep-2018
Date Available: 13-Sep-2018
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): crystallization
PEG-based hydrogels
network structure
step-growth polymerization
Sponsor/Funder: DFG, TH 662/19-1, Open Access Publizieren 2017 - 2018 / Technische Universität Berlin
Journal Title: Polymers
Publisher: MDPI
Publisher Place: Basel
Volume: 10
Issue: 9
Article Number: 970
Publisher DOI: 10.3390/polym10090970
EISSN: 2073-4360
Appears in Collections:FG Nanostrukturierte Biomaterialien » Publications

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