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Issue 18, 2014
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On the macromolecular cellulosic network of paper: changes induced by acid hydrolysis studied by NMR diffusometry and relaxometry

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Abstract

The cellulosic network of artificially acidified paper has been studied by 2D NMR relaxometry, NMR diffusometry and NMR diffusion–diffraction. Results show that the acidifying treatment enlarges the macropore structure of paper increasing the pore connectivity and modifying the exchange between water populations localized in amorphous cellulose. Acidification damage suggests that simple breaking of the amorphous portion of fibrils occurs. Nevertheless, under a specific acidifying condition, a rearrangement in the cellulose network seems to take place, with a reduction of the average macropore size and a loss of pore connectivity. The identification of water populations by 2D relaxation maps allows for monitoring the changes in cellulose water mobility due to the depolymerization process. In general the relaxation and self-diffusion results confirm that water mobility increases with acidification.

Graphical abstract: On the macromolecular cellulosic network of paper: changes induced by acid hydrolysis studied by NMR diffusometry and relaxometry

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Article information


Submitted
24 Jan 2014
Accepted
11 Mar 2014
First published
14 Mar 2014

Phys. Chem. Chem. Phys., 2014,16, 8409-8417
Article type
Paper
Author version available

On the macromolecular cellulosic network of paper: changes induced by acid hydrolysis studied by NMR diffusometry and relaxometry

A. Conti, G. Poggi, P. Baglioni and F. De Luca, Phys. Chem. Chem. Phys., 2014, 16, 8409
DOI: 10.1039/C4CP00377B

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