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Two-Step Syneretic Formation of Highly Porous Morphology During Copolymerization of Hydroxyethyl Methacrylate and Ethylene Glycol Dimethylacrylate.

SYSNO ASEP	0472515
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Two-Step Syneretic Formation of Highly Porous Morphology During Copolymerization of Hydroxyethyl Methacrylate and Ethylene Glycol Dimethylacrylate.
Author(s)	Paljevac, M. (SI) Krajnc, P. (SI) Hanková, Libuše (UCHP-M)_RID Holub, Ladislav (UCHP-M)_RID Le Droumaguet, B. (FR) Grande, D. (FR) Jeřábek, Karel (UCHP-M)_{RID, ORCID, SAI}
Source Title	Materials Today Communications. - : Elsevier - ISSN 2352-4928 Roč. 7, JUN (2016), s. 16-21
Number of pages	6 s.
Language	eng - English
Country	NL - Netherlands
Keywords	crystal morphology ; phase separation ; porosity
Subject RIV	CC - Organic Chemistry
Institutional support	UCHP-M - RVO:67985858
UT WOS	000379932400003
EID SCOPUS	84960435311
DOI	10.1016/j.mtcomm.2016.02.004
Annotation	Large pore volume and pore size ranges were achieved in 2-hydroxyethyl methacrylate (HEMA)/ethylene glycol dimethylacrylate (EGDMA) copolymers prepared by microsyneretic phase separation in free-radical copolymerization of comonomers in the presence of a tenfold volume of porogenic solvents. A mixture of methanol, i.e. good swelling solvent for poly(HEMA), and tetrahydrofuran, i.e. good swelling solvent for poly(EGDMA), was used as porogens. The morphology of the as-prepared copolymers was assessed in their native, expanded state using inverse steric exclusion chromatography (ISEC), which enabled to get a much better insight into the mechanism of pore formation than a conventional approach based on the evaluation of the morphology of dried materials. Two porosity levels with distinct pore volumes and sizes could be distinguished depending on the crosslinking degree and the MeOHITHE ratio. Their formation could be explained by a two-step syneretic phase separation during the free-radical copolymerization, namely x-induced syneresis for the larger pore sizes and v-induced syneresis for the smaller pore sizes Due to their high crosslink density, the porosity of the resulting polymers do not rely on swelling, and it was virtually independent on the nature of surrounding solvent.
Workplace	Institute of Chemical Process Fundamentals
Contact	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Year of Publishing	2017

Number of the records: 1