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Intermolecular Forces: Polymers or Fun with Chemistry!

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Presentation on theme: "Intermolecular Forces: Polymers or Fun with Chemistry!"— Presentation transcript:

1 Intermolecular Forces: Polymers or Fun with Chemistry!

2 "I just want to say one word to you -- just one word -- 'plastics.'" Advice to Dustin Hoffman's character, Ben, in The Graduate

3 Definition Plastic is broadly defined as –Any inherently formless material that can be molded or modeled under heat or pressure Amazingly versatile Usually formed from polymers

4 Polymers: Introduction Polymer: High molar mass molecule made up of a small repeating unit (monomer). –A-A-A-A-A-A-A-A-A-A-A-A-A-A-A-A-A-A-A- Monomer: Low molar mass compound that can be connected together to give a polymer Oligomer: Short polymer chain Copolymer: polymer made up of 2 or more monomers –A-B-A-B-A-B-A-B-A-B-A-B-A-B

5 As early as… Go back as far as the Old Testament –References of: Fillers Adhesives Coatings Greek word plastikos First natural plastics –Tortoise shell –Tree resins –Shellac Insect secretion

6 Good Ol Enoch Noyes b. 1760 Opened business with the use of natural polymers Made combs out of organic proteins (Keratin and Albuminoid) derived from animal horns, hoofs, an tortoise shells

7 Types of Polymers Polymer Classifications –Thermoset: cross-linked polymer that cannot be melted (tires, rubber bands, most difficult to recycle) –Thermoplastic: Meltable plastic –Elastomers: Polymers that stretch and then return to their original form: often thermoset polymers –Thermoplastic elastomers: Elastic polymers that can be melted (soles of tennis shoes)

8 Natural Rubber Natural rubber: mainly polyisoprene Charles Goodyear, 1839 Tends to be sticky when hot, brittle when warm Does not reform when stretched

9 Ebonite bracelet from 1880 1851: Hard Rubber 20-30% Sulfur

10 Types of Polymers Polymer Families –Polyolefins: made from olefin (alkene) monomers –Polyesters, Amides, Urethanes, etc.: monomers linked by ester, amide, urethane or other functional groups –Natural Polymers: Polysaccharides, DNA, proteins

11 Common Polyolefins

12 Polyesters, Amides, and Urethanes

13 DNA: A Natural Polymer

14 Some notes on qualitative data This type of data is just as important to product development as quantitative data. Color, consistency, smell, viscosity, bounciness, feel, appearance, sheer strength, remoldability, etc Physical characteristics and properties

15 Author Assignments None. Work together to present one complete report

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