Number of the records: 1

Ionic liquid-functionalized LDH as catalytic-initiating nanoparticles for microwave-activated ring opening polymerization of .epsilon.-caprolactone

SYSNO ASEP	0522716
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Ionic liquid-functionalized LDH as catalytic-initiating nanoparticles for microwave-activated ring opening polymerization of .epsilon.-caprolactone
Author(s)	Bujok, Sonia (UMCH-V)_{ORCID, RID} Konefal, Magdalena (UMCH-V)_{ORCID, RID} Abbrent, Sabina (UMCH-V)_{RID, ORCID} Pavlova, Ewa (UMCH-V)_RID Svoboda, Jan (UMCH-V)_{ORCID, RID} Trhlíková, Olga (UMCH-V)_{RID, ORCID} Walterová, Zuzana (UMCH-V) Beneš, Hynek (UMCH-V)_{RID, ORCID}
Source Title	Reaction Chemistry & Engineering. - : Royal Society of Chemistry - ISSN 2058-9883 Roč. 5, č. 3 (2020), s. 506-518
Number of pages	13 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	polycaprolactone ; ring opening polymerization ; layered double hydroxides
Subject RIV	CD - Macromolecular Chemistry
OECD category	Polymer science
R&D Projects	GA17-08273S GA ČR - Czech Science Foundation (CSF)
	LO1507 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Method of publishing	Limited access
Institutional support	UMCH-V - RVO:61389013
UT WOS	000519210200004
EID SCOPUS	85081132521
DOI	10.1039/C9RE00399A
Annotation	The paper is focused on investigation of layered double hydroxides (LDH) functionalized with ionic liquid (IL) as novel catalytic/initiating system for ring opening polymerization (ROP) of ε-caprolactone. Firstly, the Ca2+/Al3+ LDH nanoparticles were synthesized via a co-precipitation method followed by the anion exchange using phosphonium IL with decanoate anions producing the modified LDH with interlayered IL-anions. Then, the progress of microwave-assisted polymerization in the presence of the modified LDH was studied showing the anionic mechanism of ROP initiated by the water molecules, which were adsorbed on the LDH surface and intercalated in the LDH galleries. The whole polymerization was significantly accelerated by microwave energy, which induced molecular rotations of the intercalated IL-anions leading to LDH delamination and exfoliation into individual nanosheets, which made the catalytic sites (IL-anions) easily accessible for the εCL molecules. The kinetics of microwave-assisted ROP thus showed a 4.6-fold increase of the reaction rate compared to the polymerization performed under conventional heating. Activation enthalpy and entropy were calculated for the microwave-assisted polymerizations initiated by the modified LDH. The use of microwave-active catalytic-initiating LDH nanoparticles enables to synthesize the organometallic catalyst-free PCL or, at higher LDH loadings, the highly-exfoliated PCL/LDH nanocomposites, which are highly desirable for e.g. packaging materials.
Workplace	Institute of Macromolecular Chemistry
Contact	Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
Year of Publishing	2021
Electronic address	https://pubs.rsc.org/en/content/articlelanding/2020/RE/C9RE00399A#!divAbstract

Number of the records: 1