ME418 Lecture 2 Cellulose

ME418 Lecture 2 Cellulose - 2: Cellulose Saturday, February...

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2: Cellulose Saturday, February 16, 2008 1:05 PM Charles Goodyear invents vulcanization process (1833) o Sets the polymer by adding sulfur and applying heat through cross-linking   Cellulose Plastics Discovered by Christian Friederich Schönbein - a Swiss Chemist Nitric Acid + Cellulose = Nitrocellulose (transforms the polymer to contain nitrogen) Found that materials could be shapeable when heated, cooled, and repeated Material was originally shapeable Had problems with burning (occasionally) but was not explosive Alexander Parkes bought the patent Rendered it involatile but flammable (extreme explosive problems before, think  nitroglycerin) Poor mixing - results in product failure (due to even shrinking) Some of the additives slowly seep out of the material -> differential shrinkage ->  warpage John Wesley Hyatt Discovered shrinkage was due to excess additives Cellulose nitrate -> could be dyed for making dentures (as opposed to rubber)
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ME418 Lecture 2 Cellulose - 2: Cellulose Saturday, February...

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