Loading presentation...

Present Remotely

Send the link below via email or IM


Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.



No description

Sahil Kumar

on 17 January 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Polymers

Polymers By: Sahil, Ahmed, Raymond, Jawara, Jeremy -Polymers are large chain molecules made up of repeating monomers

-There are two types of polymers - Natural and synthetic

-Polymers made up of only one type of monomers are called homopolymers

-Polymers can also be made up of more than one different monomer - These are called Copolymers What Are Polymers? Nomenclature Examples of Polymers Process of forming polymers Polymerization Addition Reactions - Monomers are bonded without losing an atom (Double bonds are broken!) -Addition reactions require catalysts! OR Condensation Reactions Polyethene *Any of the H atoms in a polymer can be replaced with substituent groups to form new compounds - Atoms are eliminated in the reaction - Water is formed as well - Unlike Addition polymers, they have two reactive functional groups involved in the reaction - Condensation polymers do not necessarily have carbon double bonds Homopolymers - Identify the monomer group
- Then add the prefix"Poly-" or "Olig-" to the name Copolymers - There is no official IUPAC naming yet
-(Its listed as a work in progress) -Cellulose found in plants is an example of natural polymers, where the monomer is sugar

-Many starch polymers have branches of short chain glucoses

- Plants take these glucsoe when they need energy -Styrene monomers combine to make polystyrenes

- The Styrene monomer is an aromatic hydrocarbon

- Polystyrenes are the building blocks for the manufacture of a broad range of materials worldwide Physical Properties The most basic property of a polymer is the identity of its monomers and the arrangment of these momomers

-For example, two samples of natural rubber may have different durability, even though their molecules come from the same monomers.

-A polymer's architecture affects many of its physical properties such as solution viscosity, melt viscosity, solubility in various solvents, etc.

-The physical properties of a polymer depend on the size or length of the polymer chain. (Ie.Longer chains = higher Melting/boiling points)

-Melting point, when applied to polymers, is not a solid-liquid transition but a transition from a crystalline or semi-crystalline to a solid amorphous phase.

-The intermolecular forces in polymers can be affected by dipoles in the monomer units. (Stronger forces = higher tensile strength and higher crystalline melting points.) Applications
-Rubber is the most important of all elastomers. Natural rubber is a polymer whose repeating unit is isoprene. Most of the rubber used in the United States today is a synthetic polymer called styrene-butadiene rubber.

-The most important and versatile of the hundreds of commercial plastics is polyethylene. Polyethylene is used in a wide variety of applications because based on its structure it can be produced in many different forms.

-Fibers represent a very important application of polymeric materials, such as natural fibers like cotton, wool, and silk. Man-made fibers such as nylon, polyester, rayon, and acrylic. The combination of strength, weight, and durability have made these materials very important in modern industry.

- Also, many natural polymers are important components of our food. Sources Synthetic Natural Cellulose Starches Glycogen Natural Gases Crude Oil Coal Activities And Questionnaire! 1-Show the formation of polytetrafluoroethene by completing the addition reaction below:
| | | | | |
C=C + C=C + C=C
| | | | | |

2-Given the formula of ethene create an addition reaction to form polyethene

3-Draw the structure of polypropene
What is the main difference between synthetic polymers and natural polymers?
1)What is a polymer?

2)What is a monomer?

3)What polymerization?

4)Give some examples of natural polymers and synthetic polymers.

5)Draw a structure for a polymer made from 5 – ethylhex-1-ene. Questionnaire Resources -http://pslc.ws/macrog/kidsmac/basics.htm





Chemistry 12 Textbook Ancient History & Facts Origin of the Word Polymer Greek word polus (meaning "many, much") and meros (meaning "parts") thus (polymeris). ~The Chinese have used silk for thousands of years.
~Silk a natural fibre produced when caterpillars of bombyx mory moths make their cocoons.
~Is a fibre much thinner than a human hair, but much stronger than a similar-sized steel wire. A Short History of Synthetic Polymers ~1839: Vulcanized rubber was developed by Charles Goodyear.
~1909: Bakelite, first fully synthetic polymer invented by Hendrik Baekeland.
~1929: Vinyl used worldwide today invented by Waldo Sermon.
~1933: Saran, initially meant for fighter jets coating & today meant for food.
~1935: Nylon replaced silk in stockings and parachutes invented by
Wallace Crothers. Properties of Plastics ~Chemically unreactive
~Held together by strong and stable bonds
~Single bonds (C-C) are less reactive then double bonds (C=C)
~Resist Breakage
~Can be molded to acquire a specific shape
~Experience polymer cross linking Polymer Cross-Linking When links form amongst the functional groups that are aligned in the long polymer chains. This helps strengthen the polymer.
Full transcript