Synthetic Polymers.

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Presentation transcript:

Synthetic Polymers

Introduction A polymer is a large molecule composed of many smaller repeating units. First synthetic polymers: Polyvinyl chloride (PVC) in 1838 Polystyrene in 1839 Now, 250 billion pounds produced annually, worldwide.

Plasticizers Nonvolatile liquid that dissolves, lowers the attraction between chains, and makes the polymer more flexible. Example: Dibutyl phthalate is added to poly(vinyl chloride) to make it less brittle. The plasticizer evaporates slowly, so “vinyl” becomes hard and inflexible over time…..The foggy film that forms on your windshield on a hot day.

Classes of Polymers Addition, or chain-growth, polymers Condensation, or step-growth, polymers =>

Addition Polymers Three kinds of intermediates: Free radicals Carbocations Carbanions Examples of addition polymers: polypropylene plastics polystyrene foam insulation poly(acrylonitrile) Orlon® fiber poly(methyl -methacrylate) Plexiglas ®

Free Radical Polymerization =>

Chain Branching Low-density polyethylene: soft and flimsy highly branched, amorphous structure

Cationic Polymerization Alkene is treated with an acid. Intermediate must be a stable carbocation.

Anionic Polymerization Alkene must have an electron-withdrawing group like C=O, CN, or NO2. Initiator: Grignard or organolithium reagent.

Stereochemistry =>

Properties of Polymers Isotactic and syndiotactic polymers are stronger and stiffer due to their regular packing arrangement. Anionic intermediate usually gives isotactic or syndiotactic polymers. Free radical polymerization is nearly random, giving branched atactic polymers.

Ziegler-Natta Catalyst Polymerization is completely stereospecific. Either isotactic or syndiotactic, depending on catalyst. Polymer is linear, not branched. Example of catalyst: solution of TiCl4 mixed with solution of (CH3CH2)3Al and heated for an hour.

Natural Rubber Soft and sticky, obtained from rubber tree. Long chains can be stretched, but then return to original structure. Chains slide past each other and can be pulled apart easily. Structure is cis-1,4-polyisoprene.

Vulcanization Process was discovered accidentally by Goodyear when he dropped rubber and sulfur on a hot stove. Sulfur produces cross-linking that strengthens the rubber. Hardness can be controlled by varying the amount of sulfur.

Synthetic Rubber With a Ziegler-Natta catalyst, a polymer of 1,3-butadiene can be produced, in which all the additions are 1,4 and the remaining double bonds are all cis. It may also be vulcanized.

Copolymers Two or more different monomers. Saran®: alternating molecules of vinyl choride and 1,1-dichloroethylene. ABS plastic: acrylonitrile, butadiene, and styrene.

Condensation Polymers Polymer formed by ester or amide linkages between difunctional molecules. Step growth: Monomers do not have to add one at a time. Small chains may condense into larger chains. Common types: Polyamides Polyesters Polycarbonates Polyurethanes

Polyamides: Nylon Usually made from reaction of diacids with diamines, but may also be made from a single monomer with an amino group at one end and acid group at other.

Nylon

Polyesters Dacron® and Mylar®: polymer of terephthalic acid and ethylene glycol. Made by the transesterification of the methyl ester.

Polycarbonates Esters of carbonic acid. Carbonic acid is in equilibrium with CO2 and water, but esters are stable. React phosgene with bisphenol A to obtain Lexan® for bulletproof windows.

Thermoplastics: High Density Polyethylene

Recycling

Compressed Plastics: Recycled-Landfill?