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Wood and Paper as Materials for the 21st Century

Published online by Cambridge University Press:  31 January 2011

Philip Jones  and
Theodore H Wegner
Philip Jones
Affiliation:
pjones@imerys.com, Imerys, 100 Mansell Ct E, Roswell, Georgia, 30076, United States, 770 331 0325, 770 645 3391
Theodore H Wegner
Affiliation:
twegner@fs.fed.us, USDA Forest Service, Forest Products Laboratory, Madison, Wisconsin, United States
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Abstract

Wood and paper are ubiquitous in societies around the world and are largely taken for granted as part of traditional industries with no new science to learn. Many of the technologies used in the forest products industry have been gained empirically through experience. The complexities of wood are now yielding to newer tools and we are beginning to see how the mechanical, optical and other physical properties of wood are related to hierarchical structures based on 2 to 10 nm diameter several hundred nm long fibers of nanocrystalline cellulose (NCC). The liberation of these NCC’s is allowing their re-assembly into remarkably strong structures. Examples will be given of the nature of these building blocks and structures assembled from them. Examples will include nanocomposites as well as very high strength “paper”. Paper is another example of a process whereby nanofibrils are released and then re-assembled with the use of “retention, drainage and formation aides” to make substrates we call paper with remarkable strength to weight performance. Other disciplines call this process “self-assembly” and the “aids” as necessary surfactants and additives to control structure and performance. Glossy magazine papers, for example, have approximately 10 micron thick coatings of white minerals and latex binders which are increasingly of nano dimensions. The coatings are assembled in structures to provide optical barrier performance (opacity) as well as controlled ink interaction with the necessary strength to survive printing and handling. These coatings are frequently similar in structure to seashells and, from this knowledge, progress has been made in understanding the mechanisms at play in achieving higher strength coatings. More recently kaolin clays have been introduced with mean crystal thicknesses in the range 20 to 40 nm instead of the usual 100 to 140 nm. These clays show useful strength performance and represent what may be called pragmatic nanoclays. Novel chemistries based on biomimetic learnings are emerging to displace the conventional starch or latex binders. Examples will be given of protocols for moving toward higher strength systems.

Keywords

biomaterialcompositenanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1187: Symposium KK – Structure-Property Relationships in Biomineralized and Biomimetic Composites , 2009 , 1187-KK04-06
Copyright
Copyright © Materials Research Society 2009

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