Exam 4: Chapter 9

What are Polymers?
Polymers are long chains of atoms covalently bonded together
What is a Monomer?
a Monomer is a small molecule used to synthesize a polymer chain; What makes up a polymer
What defines a plastic?
A plastic is anything that can be molded to a desired shape
What is Addition Polymerization?
The process of adding atoms to a polymer chain
What is a catalyst?
Something that speeds up a chemical reaction, but does not change the product
What is a VOC?
Volatile organic compound- a compound that passes easily into the vapor phase. All VOC’s contain carbon and hydrogen.
What is polyethylene?
A polymer; used to make milk jugs.
What is an Intermolecular force?
the attraction of 2 molecules by an inside force (Electrons, Neutrons, etc.)
What is a Dispersion force?
The stretching of plastic. This stretching changes the molecular make-up of the Polymer

What is HDPE?

LDPE?

HDPE- High Density Polyethylene.

LDPE- Low Density Polyethylene.

High density is stronger than low density.

High density is often opaque.

Low density is often transparent.

What is thermal plastic?
Plastic that can be melted down and reshaped over and over
What is a Crystalline region?
A region of polymer that is very organized.

What is Polyethylene?

What are its properties?

What are its uses?

    H        H

           /

      C =C   

   /    

      H        H   

Polyethylenes properties: Translucent if not pigmented. Soft and flexible. Unreactive to acids and bases. Strong and tough.

Uses: Bags, films, sheets, bubble wrap, toys, wire insulation.

What is Polyvinyl Chloride?

What are its properties?

What are its uses?

    H        H

           /

      C =C   

   /    

      H        Cl    

 Properties: Rigid if not softened by plasticizer. Clear and shiny, but often pigmented. Resistent to most chemicals, including acids, and bases

Uses: Rigid: Plumbing pipe, house siding, Charge cards.

Soft: Garden hoses, waterproof boots, shower curtains, IV tubing.

What is Polystyrene?

What are its properties?

What are its uses?

    H        H

           /

      C =C   

   /    

      H      __

              /  O 

               __/

Properties: Variable. “Crystal” from transparent, sparkling, somewhat brittle. “Expandable” from lightweight foam. Both forms are rigid and dissolve in many organic solvents

Uses: Bottle Caps. Yogurt, Cream, and margarine containers. Carpeting, casual furniture, luggage.

What is Polyethylene terephthalate?

What are its properties?

What are its uses?

            O                     O

                   __     //

             C_ /  O \_C

             /    __/  

            HO           OH

Properties: Transparent, strong, shatter-resistant. Impervious to acids and atmospheric gases. Most costly of the “Big six” polymers.

Uses: Soft-drink bottles, clear food containers, beverage glasses, fleece fabrics, carpet yarns, fiber-fill insulation.

*Note* Polyetylene terephthalate is made with 2 different Monomers

What is an amorphous region?
A random, disorganized structure. A lot looser than a crystalline region
What is a plasticizer?
a compound added to polymers to make them either harder or softer.
What is a blowing agent?
a substance capable of producing a foamed plastic
x

Hi!
I'm Larry

Hi there, would you like to get such a paper? How about receiving a customized one?

Check it out