PKSC 1020 Lecture Notes - Lecture 7: Gutta-Percha, Leo Baekeland, Polyvinyl Chloride
26 Sep 2017
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Document Summary
Packagine is the largest user of plastics, ~30% of total plastics market. Plastics = polyers for our puposes use these words interchangeably mer: is a unit poly: is many. 1843 malaysia gutta percha derived from latex of tropical trees (getah- sap) (percha. Strips of cloth) used for knife handles, picture frames. Dies and presses for shellac, straw pulp and gutta percha for buttons, checkers and personal care items. ,000 reward for substitute for ivory billiard balls. John hyatt developed celluloid from cellulose nitrate and camphor. Dr. leo baekeland- patended controlled reaction between phenol and formaldehyde. Today polyethylene is the most widely used packaging plastic 13. 3 billion lbs. is used for packaging. Six times more pe used than the next most popularly used plastic. Film less than or equal to 0. 001 thick. Sheet - greater than 1 mil thickness. All plastics based on carbon unit - c - H h high pressure h h h h h.
