NDLI: Dynamics property recovery of archaeological-wood fibers treated with polyethylene glycol demonstrated by high-resolution solid-state NMR

Content Provider	Springer Nature Link
Author	Bardet, Michel Gerbaud, Guillaume Doan, Châu Giffard, Mathilde Hediger, Sabine Paëpe, Gaël Trân, Quôc Khôi
Copyright Year	2012
Abstract	We used high-resolution Solid-State 13C NMR to better understand and optimize the conservation process of archaeological waterlogged woods by polyethylene glycol (PEG) impregnation via the study of the molecular interactions between PEG and residual celluloses. By both deconvoluting NMR spectra and analyzing the behavior of 13C magnetization build-up under proton to carbon cross-polarization conditions, we were able to quantify PEG penetration and extract parameters sensitive to molecular dynamics such as proton spin lattice-relaxation-time constants in the rotating frame T1ρH and the cross-relaxation time constant TCH. By exploring a large range of PEG concentrations for the impregnating solutions we show that the PEG penetrates inside the fibers and interacts at a molecular level with the cellulose fibrils thus restoring the dynamics properties of the damaged molecular cell wall network. At high PEG concentration, the polymer accumulates in the remaining free volume with more and looser molecular interactions with the residual wood components. This feature explains the facility for these hydroscopic materials to exude from the wood and led to deleterious consequences for the restored artefacts.
Starting Page	1537
Ending Page	1545
Page Count	9
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	19
Issue Number	5
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-06-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solid-state NMR Polyethylene glycol Polymer cellulose interactions Wood restoration Archaeology Waterlogged woods Polymer Sciences Physical Chemistry Bioorganic Chemistry Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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