Polymers - Organic Chemistry - Lecture Slides, Slides of Organic Chemistry

Download Polymers - Organic Chemistry - Lecture Slides and more Slides Organic Chemistry in PDF only on Docsity! Organic Polymers docsity.com Polymers • Polymers – Huge molecules, molecular weights can exceed one million g/mole – Contain repeating units (poly = many, mer = unit) – Pervasively used in modern society • non-breakable cups • bottles • pipes • CD’s • raincoats • non-stick coatings • food wraps/bags • hot tubs docsity.com Regioselectivity • PVC contains alternating CH2 and CHCl groups, why no CH2CH2 or CHClCHCl units? C C H Cl H H In C CIn H H Cl H C C H Cl H H C CIn H H Cl H C H H C Cl H C C H Cl H H C CIn H H Cl H C H H C Cl H C H H C Cl H C H H C Cl H n = C CIn H H Cl H C H H C Cl H C CIn H H Cl H C Cl H C H H C CIn H H Cl H C H H C Cl H Resonance stabilized when radical near Cl No resonance stabilization with radical near CH2 docsity.com Copolymers • Polymers formed with more than one type of monomer are called copolymers • Saran wrap is one example Cl Cl Cl excess Vinylidene chloride Vinyl chloride + In C C Cl Cl C C ClH H H H H m n o Saran Wrap docsity.com Problem • Strong electron-withdrawing groups are needed to promote anionic polymerization • One of the molecules below (“superglue”) polymerizes in the presence of even weak bases such as water – which molecule is it? Cl Cl Cl CN CO2CH3 CN CH3 CH3 Draw the structure of the polymer it forms docsity.com