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Wednesday, May 31 • 3:30pm - 4:00pm
016. (Book and Paper) Measuring the Stiffness of Brittle Paper

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It has been estimated that one third of the paper materials in libraries are too brittle to handle. The structure of a typical paper sheet is comprised of semi-rigid cellulose fibers.  These cellulose fibers are more than ten times longer than the sheet thickness and can be considered a two dimensional random fiber network. The main pathways of paper degradation, acid-catalyzed hydrolysis and oxidation, cause depolymerization of the cellulose chains and breaking of the intrafiber bonds, directly impacting the paper's physical properties.  Conventional mechanical measurements of aged paper are destructive and often too severe to understand the true extent of deterioration.  We have compared the reproducibility and results of the rolling test, fold endurance test, tensile tests and have developed a new test, the JHU bend test.  The goal of these tests is to measure the strengths of naturally aged papers with varying amounts of brittleness. Through this comparison and the use of mathematical modeling developed by the JHU Department of Physics and Astronomy we show the limits of each test and relate the state of paper degradation to test results.

Speaker(s)
avatar for Andrea KI Hall

Andrea KI Hall

Student, Johns Hopkins University, Milton S. Eisenhower Library
Andrea Hall is Senior Research Specialist at Heritage Science for Conservation in the Department of Conservation and Preservation at Johns Hopkins University where she is working on physical property testing of heritage materials, environmental monitoring, studying conservation testing... Read More →

Co-Author(s)
avatar for Molly McGath

Molly McGath

Conservation Scientist, The Mariners' Museum and Park
Molly K. McGath is the Analytical Chemist at The Mariners' Museum and Park. McGath received her doctorate from the University of Arizona in Materials Science and Engineering with a focus in Conservation Science.Her current research includes studying the deterioration mechanisms of... Read More →
avatar for Dr. Patricia McGuiggan

Dr. Patricia McGuiggan

Professor/Educator, Johns Hopkins University, Milton S. Eisenhower Library
Dr. McGuiggan obtained her Ph.D. in Chemical Engineering from the University of Minnesota.  During her Ph.D., she was a research scholar in the Applied Mathematics Department at the Australian National University working with Richard Pashley.  She spent 3 years as a postdoctoral... Read More →
avatar for Thomas O'connor

Thomas O'connor

Graduate Research Assistant, Department of Physics and Astronomy, Johns Hopkins University
Thomas O’Connor is a computational soft matter physicist interested in understanding the atomic scale mechanisms of material deformation and how they produce the mechanical properties we observe at the human scale. O’Connor is particularly interested in “soft” solids like... Read More →

Wednesday May 31, 2017 3:30pm - 4:00pm
Riverside West Exhibit Hall Exhibit Level, East Tower

Attendees (47)