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HERO ID
3859222
Reference Type
Journal Article
Title
Grafting of perfluoroalkyl chains onto wood using blocked isocyanates
Author(s)
Engonga, PE; Marchetti, V; Gerardin, P; Tekely, P; Loubinoux, B
Year
2000
Is Peer Reviewed?
Yes
Journal
Journal of Fluorine Chemistry
ISSN:
0022-1139
EISSN:
1873-3328
Publisher
Elsevier
Volume
101
Issue
1
Page Numbers
19-25
Language
English
DOI
10.1016/S0022-1139(99)00185-2
Web of Science Id
WOS:000084492400005
Abstract
Chemical modification of wood was investigated using blocked isocyanates prepared from reaction of 4,4'-diphenylmethane diisocyanate (MDI) with I equivalent of 2-perfluorohexyl ethanol followed by addition of 1.1 equivalent of methyl ethyl ketoxime (MEKO). Thermal dissociation of the urethane linkage bearing a methyl ethyl ketoxime group allows generation of free isocyanate which reacts with alcohols like cyclohexanol or benzyl alcohol. The reaction was then extended to the hydroxyl groups of wood in order to bind perfluoroalkyl chains. Reaction was first studied on wood meal before grafting on blocks. Such modified blocks possess improved dimensional stability compared to untreated ones. Contact angle measurements were also performed. sigma values obtained for modified blocks were greater and did not decrease with time compared to those obtained with unmodified blocks. (C) 2000 Elsevier Science S.A. All rights reserved.
Keywords
contact angle; perfluoroalkyl; blacked isocyanates; anti-swelling-efficiency; dimensional stabilization; wood
Tags
PFAS
•
FtOH 6:2
Screening Results
Excluded/Not on Topic
•
^Per- and Polyfluoroalkyl Substances (PFAS)
FtOH 6:2 (647-42-7)
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