PMID- 30979154
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200930
IS  - 2073-4360 (Electronic)
IS  - 2073-4360 (Linking)
VI  - 8
IP  - 3
DP  - 2016 Feb 24
TI  - Acid Ionic Liquids as a New Hardener in Urea-Glyoxal Adhesive Resins.
LID - 10.3390/polym8030057 [doi]
LID - 57
AB  - The effect of acidic ionic liquid (IL) as a new catalyst on the properties of 
      wood-based panels bonded with urea-glyoxal (UG) resins was investigated. 
      Different levels of N-methyl-2-pyrrolidone hydrogen sulfate ([HNMP] HSO(4) (0, 1, 
      2, 3 wt %)) were added to prepared UG resin. The resin was then used for 
      preparing laboratory particleboard panels. Then, the properties of the prepared 
      panels were evaluated. The structure of the prepared UG resin was studied by 
      (13)C NMR, and thermal curing behavior of the resin before and after the addition 
      of IL was measured by DSC. Additionally, the main oligomers formed in the UG 
      reaction were identified by matrix-assisted laser desorption/ionization 
      time-of-flight (MALDI TOF) mass spectroscopy. The results indicated that IL can 
      be used as an efficient catalyst for UG resin. The physicochemical tests 
      indicated that the addition of [HNMP] HSO(4) from 0 to 3 wt % decreased the pH 
      value of the glue-mix, and the pH decreased on curing to the same level as 
      urea-formaldehyde resins. The gel accelerated with increasing catalyst content 
      and with the decreasing of the pH in the UG resin. The panels prepared with IL 
      had higher mechanical strength and dimensional stability compared to those made 
      from UG resins containing NH(4)Cl. Scanning electron microscope (SEM) micrographs 
      showed that the panels prepared with ionic liquid presented low porous. DSC 
      analysis showed that the addition of IL to the UG resin decrease the energy of 
      activation of the curing reaction to render possible cross-linking. The MALDI TOF 
      results indicated a preponderant linearity of the oligomers formed, implying a 
      high energy of activation of curing for UG resins.
FAU - Younesi-Kordkheili, Hamed
AU  - Younesi-Kordkheili H
AD  - Department of Wood and Paper Sciences and Technology, Faculty of Natural 
      Resources, Semnan University, Semnan 35131-19111, Iran. 
      Hamed.Younesi@semnan.ac.ir.
FAU - Pizzi, Antonio
AU  - Pizzi A
AUID- ORCID: 0000-0002-9749-7185
AD  - LERMAB-ENSTIB, University of Lorraine, Epinal 88000, France. 
      antonio.pizzi@univ-lorraine.fr.
LA  - eng
GR  - Antonio Pizzi/
PT  - Journal Article
DEP - 20160224
PL  - Switzerland
TA  - Polymers (Basel)
JT  - Polymers
JID - 101545357
PMC - PMC6432518
OTO - NOTNLM
OT  - 13C NMR
OT  - DSC
OT  - MALDI TOF
OT  - acidic ionic liquid
OT  - catalyst
OT  - urea-glyoxal resin
COIS- The authors declare no conflict of interest.
EDAT- 2016/02/24 00:00
MHDA- 2016/02/24 00:01
PMCR- 2016/02/24
CRDT- 2019/04/14 06:00
PHST- 2016/01/23 00:00 [received]
PHST- 2016/02/08 00:00 [revised]
PHST- 2016/02/17 00:00 [accepted]
PHST- 2019/04/14 06:00 [entrez]
PHST- 2016/02/24 00:00 [pubmed]
PHST- 2016/02/24 00:01 [medline]
PHST- 2016/02/24 00:00 [pmc-release]
AID - polym8030057 [pii]
AID - polymers-08-00057 [pii]
AID - 10.3390/polym8030057 [doi]
PST - epublish
SO  - Polymers (Basel). 2016 Feb 24;8(3):57. doi: 10.3390/polym8030057.