Difference between revisions of "Alpha cellulose"
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One of three classes of [[cellulose|cellulose]], alpha cellulose has the highest degree of polymerization and is the most stable. The other two classes, known as [[hemicellulose|hemicelluloses]], are [[beta%20cellulose|beta cellulose]] and [[gamma%20cellulose|gamma cellulose]]. Alpha cellulose is the major component of wood and paper pulp. It may be separated from the other components by soaking the pulp in a 17.5% solution of [[sodium%20hydroxide|sodium hydroxide]]. The pure white, alpha cellulose is insoluble and can be filtered from the solution and washed prior to use in the production of paper or cellulosic polymers. A high percent of alpha cellulose in paper will provides a stable, permanent material. [[Linen|Linen]] and [[cotton|cotton]] contain high proportions of alpha cellulose. | One of three classes of [[cellulose|cellulose]], alpha cellulose has the highest degree of polymerization and is the most stable. The other two classes, known as [[hemicellulose|hemicelluloses]], are [[beta%20cellulose|beta cellulose]] and [[gamma%20cellulose|gamma cellulose]]. Alpha cellulose is the major component of wood and paper pulp. It may be separated from the other components by soaking the pulp in a 17.5% solution of [[sodium%20hydroxide|sodium hydroxide]]. The pure white, alpha cellulose is insoluble and can be filtered from the solution and washed prior to use in the production of paper or cellulosic polymers. A high percent of alpha cellulose in paper will provides a stable, permanent material. [[Linen|Linen]] and [[cotton|cotton]] contain high proportions of alpha cellulose. | ||
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| + | == Other Properties == | ||
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| + | Paper pulp that is high in alpha cellulose can be identified using [[Graff "C" stain]], which will stain pinkish red. Examples of common paper fibers that are high in alpha cellulose include [[cotton]], [[flax]], [[ramie]], and [[Kozo]]. Alpha cellulose pulps can be created from wood pulps using extended [[sulfite process|sulfite]], or mercerized [[kraft process|kraft]] pulping methods. | ||
== Additional Images == | == Additional Images == | ||
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<gallery> | <gallery> | ||
File:SBA 40x pinoidpitslabel.jpg|Softwood Bleached Alpha Fiber stained with Graff "C" Stain | File:SBA 40x pinoidpitslabel.jpg|Softwood Bleached Alpha Fiber stained with Graff "C" Stain | ||
| − | <gallery> | + | </gallery> |
== Authority == | == Authority == | ||
Revision as of 13:44, 22 August 2014
Description
One of three classes of Cellulose, alpha cellulose has the highest degree of polymerization and is the most stable. The other two classes, known as hemicelluloses, are Beta cellulose and Gamma cellulose. Alpha cellulose is the major component of wood and paper pulp. It may be separated from the other components by soaking the pulp in a 17.5% solution of Sodium hydroxide. The pure white, alpha cellulose is insoluble and can be filtered from the solution and washed prior to use in the production of paper or cellulosic polymers. A high percent of alpha cellulose in paper will provides a stable, permanent material. Linen and Cotton contain high proportions of alpha cellulose.
Other Properties
Paper pulp that is high in alpha cellulose can be identified using Graff "C" stain, which will stain pinkish red. Examples of common paper fibers that are high in alpha cellulose include Cotton, Flax, Ramie, and Kozo. Alpha cellulose pulps can be created from wood pulps using extended sulfite, or mercerized kraft pulping methods.
Additional Images
Softwood Bleached Alpha Fiber stained with Graff "C" Stain
Authority
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 169
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
- E.J.LaBarre, Dictionary and Encyclopedia of Paper and Paper-making, Swets & Zeitlinger, Amsterdam, 1969
- A Glossary of Paper Conservation Terms, Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998
- Roy Perkinson, contributed information, 1998
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Website address 1 Comment: http://www.archivalsuppliers.com/glossary.html