Special MSE Lecture - Prof. Dr. Jean L. Leblanc
Date: October 22, 2010 from 10:30 am to 11:30 am EDT
Location: 214 S. W. Mudd
Contact: For further information regarding this event, please contact Wesley Hattan by sending email to wjh2121@columbia.edu or by calling 2128547860.
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If you can make some calculation, you know something of your subject: an illustration with filled rubber compounds

Dr. Jean L. Leblanc
UPMC - Paris-Sorbonne Universites
Polymer Rheology & Processing, France

Synopsis : Without reinforcing filler rubbers would have no application of industrial importance, key developments like automotive and arcraft tires would have remainded in limbo and our world would have evolved along a totally different path. The discovery of rubber reinforcement by finely dispersed carbon black particles in Silvertown, UK in 1907 is thus the perfect example of key engineering development, whose complex scientific issues still challenge an overall understanding despite a century of active research works. What is well established today is that carbon black aggregates are the reinforcing entities, that such aggregates develop complex interactions with rubber chains and that the reinforcing effect is essentially physical, with very little role, if any, plaid by rubber and/or carbon black chemistry. Despite the complexity of the problem, some progress was made at the eve of this century so that workable theoretical models are now available to somewhat enlighten the likely origin of reinforcement. A workable model is one that allows calculation to be made and the easier the calcultation, the more convincing the model, and the more significant the information obtained through calculation. The purpose of the seminar is to show that, starting from a suitable geometrical description of carbon black aggregates, easy to measure properties do document such a description so that certain mechanical properties of filled rubber compounds can be calculated and compared with experimental data.