Polymers

Question 1

Example of a natural polymer

Answer 1

Spider silk

Question 2

Example of synthetic polymer

Answer 2

kevlar

Question 3

chemical compound that is in the form of long, repeating chains.

Answer 3

polymer

Question 4

True or false: A polymer can easily contain thousands of atoms, and have a molar mass of more than 1,000,000 g/mol

Answer 4

True

Question 5

small molecules used to synthesize polymers.

Answer 5

Monomers

Question 5

Traced back to its Greek origins, the word polymer literally means

Answer 5

“may parts”

Question 6

These are routinely used as structural materials for things like computer cases and casual furniture.

Answer 6

Hard and Durable Plastics

Question 6

It is the starting material for many plastics, pharmaceuticals, fabrics, and other carbon-based products.

Answer 6

Crude oil

Question 6

polymers those derived from plants and animals

Answer 6

Natural Polymers

Question 6

can be formed from one monomer, or from a combination of two or more different monomers.

Answer 6

Polymers

Question 6

Imagine that future historians might label the late 20th century and early 21st century as the _

Answer 6

Polymer Age

Question 7

give us sandwich bags and Saran wrap.

Answer 7

Soft and Flexible Plastics

Question 7

Classifications of Polyethylene

Answer 7

Low Density (LDPE)
High Density (HDPE)

Question 7

These products can be reused, but may not always be recycled

Answer 7

LDPE

Question 7

these are found in our carpets and clothing.

Answer 7

Nylon and Rayon

Question 8

These materials include wood, rubber, cotton, wool, leather, and silk.

Answer 8

Natural Polymers

Question 8

2 types of polymers

Answer 8

Natural
Synthetic

Question 9

used to make many different types of plastic bottles, toys, stiff or “crinkly” plastic bags, and heavy-duty pipes

Answer 9

HDPE

Question 9

found in many packaging materials, including plastic bags, milk jugs, detergent containers, and “bubble wrap”.

Answer 9

Polyethylene

Question 9

used to create materials with properties ideal for different applications.

Answer 9

Synthetic Polymers

Question 10

Classification of Polyethylene: the plastic bags dispensed in
supermarkets

Answer 10

Low Density (LDPE)

Question 10

a hard plastic with little flexibility.

Answer 10

Polystyrene

Question 11

exhibits a highly ordered molecular structure and has a slightly higher density, greater rigidity, more strength, and a higher melting point

Answer 11

HDPE

Question 12

a polymer made up of repeating molecules called styrene.

Answer 12

Polystyrene (poly-phenylethene)

Question 12

Example of polystyrene products

Answer 12

- Transparent DVD cases - clear-plastic party glasses - plates - computers and phone exteriors

Question 13

What are the 4Rs?

Answer 13

Reduce Reuse Recycle Recover

Question 13

Properties of Polystyrene

Answer 13

- thermoplastic - electrical insulator - resistant to acids and bases

Question 13

means not disposing of it after a single use.

Answer 13

Reuse

Question 14

a substance used to bond together the surfaces of two solid materials (adherends

Answer 14

Adhesive

Question 14

Functions of coatings:

Answer 14

- to prevent corrosion or deterioration - item's appearance - electrical insulation

Question 15

plastic materials that contain a relatively high volume percentage of small pores and trapped gas bubbles.

Answer 15

Foams

Question 15

Examples of natural adhesives

Answer 15

- animal glue - casein - starch - rosin

Question 16

Foreign substances that are intentionally introduced to enhance or modify polymer properties.

Answer 16

Polymer Additives

Question 17

most often added to polymers to improve tensile and compressive strengths, abrasion resistance, toughness, dimensional and thermal stability

Answer 17

Filler Materials

Question 17

the process by which monomers are covalently bonded to form a polymer chain or network.

Answer 17

polymer synthesis or polymerization

Question 17

Polymers that contain fillers may also be classified as

Answer 17

Composite materials

Question 18

Geometric Classifications of Fillers

Answer 18

Novel-Shaped Fillers Particulate Fillers Layered Fillers Fibrous Fillers

Question 19

The flexibility, ductility, and toughness of polymers may be improved with the aid of additives called ____

Answer 19

Platicizers

Question 20

These produces reductions in hardness and stiffness

Answer 20

Plasticizers

Question 20

These are generally liquids with low vapor pressures and low molecular weights.

Answer 20

Plasticizers

Question 21

These are commonly used in polymers that are intrinsically brittle at room temperature, such as poly(vinyl chloride) (PVC)

Answer 21

Plasticizers

Question 22

Additives that counteract deteriorative processes

Answer 22

Stabilizer Additives

Question 23

These impart a specific color to a polymer; they may be added in the form of dyes or pigments.

Answer 23

Colorants

Question 23

The flammability resistance of the remaining combustible polymers may be enhanced by ___

Answer 23

Flame Retardants

Question 24

These interfere with the combustion process through the gas phase or by initiating a different combustion reaction

Answer 24

Flame Retardants

Question 24

5 Common Polymer Additives

Answer 24

1. Fillers 2. Plasticizers 3. Stabilizer 4. Colorants 5. Flame Retardants

Question 25

Plastic Resin Identification Codes

Answer 25

1. Polyethylene Terepthalate (PETE) 2. High Density Polyethylene (HDPE) 3. Polyvinyl Chloride (PVC) 4. Low Density Polyethylene (LDPE) 5. Polypropylene (PP) 6. Polystyrene (PS) 7. Other

Question 25

Plastic Resin that involves cleaning supply jugs, pool liners, twine, sheeting, automotive product bottles, sheeting

Answer 25

Polyvinyl Chloride (PVC)

Question 26

Forming Techniques for Plastics

Answer 26

1. Compression and Transfer Molding 2. Injection Molding 3. Extrusion 4. Blow Molding 5. Casting

Question 26

Plastic Resin that involves bread bags, paper towels & tissue overwrap, squeeze bottles, trash bags six-pack rings

Answer 26

Low Density Polyethylene (LDPE)

Question 27

Plastic Resin that involves milk jugs, detergent & shampoo bottles, flower pots, grocery bags

Answer 27

High Density Polyethylene (HDPE)

Question 27

Plastic resin that involves yogurt tubs, cup: juice bottles, straws, hangers, sand & shipping bags

Answer 27

Polypropylene (PP)

Question 27

Plastic Resin that involves soda & water bottles; cups, jars, trays, clamshells

Answer 27

Polyethylene Terepthalate (PETE)

Question 28

most widely used technique for fabricating thermoplastic materials.

Answer 28

injection molding

Question 29

Plastic resin that involves to-go containers & flatware, hot cups, razors, CD cases, shipping cushion, cartons, trays

Answer 29

Polystyrene (PS)

Question 29

Plastic Resin that involves polycarbonate, nylon, ABS, acrylic, PLA; bottles, safety glasses, CDs, headlight lenses.

Answer 29

Other

Question 29

In this process, the appropriate amounts of thoroughly mixed polymer and necessary additives are placed between mold members

Answer 29

Compression molding

Question 30

In this process, the correct amount of pelletized material is fed from a feed hopper into a cylinder by the motion of a plunger or ram. As a result, the thermoplastic material melts to form a viscous liquid.

Answer 30

Injection molding

Question 31

the molding of a viscous thermoplastic under pressure through an open-ended die

Answer 31

Extrusion

Question 32

In this process, a mechanical screw or auger propels the pelletized material through a chamber, where it is successively compacted, melted, and formed into a continuous charge of viscous fluid.

Answer 32

Extrusion

Question 33

It is similar to that used for blowing glass bottles.

Answer 33

Blow molding

Question 34

This is a process where a molten plastic material is poured into a mold and allowed to solidify.

Answer 34

Casting