1 / 15

Intermolecular Forces: Polymers

Fun with Chemistry!. Intermolecular Forces: Polymers. or. "I just want to say one word to you -- just one word -- 'plastics.'" Advice to Dustin Hoffman's character, Ben, in The Graduate. Definition. Plastic is broadly defined as

rey
Download Presentation

Intermolecular Forces: Polymers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fun with Chemistry! Intermolecular Forces: Polymers or

  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 Charles Goodyear, 1839 • Natural rubber: mainly polyisoprene • 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 Physical characteristics and properties Color, consistency, smell, viscosity, bounciness, feel, appearance, sheer strength, remoldability, etc This type of data is just as important to product development as quantitative data.

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

More Related