Chapter 14 Flashcards
Most polymers are considered _____. Which consist of what elements?
Hydrocarbons
Hydrogen and Carbon
Ref: Lecture Notes CH14
What is the principal characteristic of saturated hydrocarbons?
Only single bonds are present.
Ref: Lecture Notes CH14
In saturated hydrocarbons, each carbon has only ___ valence electrons.
Four
Ref: Lecture Notes CH14
In saturated hydrocarbons, carbon’s four valence electrons are ___ bonded to the four other atoms.
Singly bonded
Ref: Lecture Notes CH14
What defines the bonding angles in saturated hydrocarbons?
Covalent Bonds.
Ref: Lecture Notes CH14
What is the simplest hydrocarbon?
Methane, CH4
Ref: Lecture Notes CH14
With respect to hydrocarbons; if the number of carbon atoms goes up, the boiling point _____.
Increases.
Ref: Lecture Notes CH14
Unsaturated hydrocarbons are chemically ____.
Reactive.
Ref: Lecture Notes CH14
Hydrocarbons that have double or triple bonds are referred to as ____.
Unsaturated hydrocarbons.
Ref: Lecture Notes CH14
In saturated vs. unsaturated hydrocarbons, which is the more reactive chemically?
Unsaturated Hydrocarbons
Ref: Lecture Notes CH14
Rank the following in terms of modulus of elasticity with highest at number one and lowest at number 3:
- Elastomer
- brittle polymer
- plastic
- Brittle polymer
- Plastic
- Elastomer
Ref: Lecture Notes CH14
Define Isomerism.
Two compounds with the same chemical formula that have quite different physical structures.
Ref: Lecture Notes CH14
Typically isomerism belongs to _____ molecular chains.
Longer
Ref: Lecture Notes CH14
What product is polyethylene (PE) used in?
Tupperware and other common household plastics. Packaging, grocery bags, children’s toys.
Ref: Wikipedia
What product is poly-vinyl chloride (PVC) used in?
It’s a common use, very versatile plastic.
My experience: Tubing and plumbing
Ref: Wikipedia
What general applications is Polytetrafluoroethylene (PTFE) used in?
Teflon Tape, chemically inert pipes, anti-corrosion applications.
Ref: Wikipedia
What is Polypropylene (PP) used in?
Common household plastics and packaging.
Ref: Wikipediaa
What is polystyrene (PS) generally used for?
PS is a hard solid plastic so it can be used in household appliances to gardening (pots and tools) to cups and firmware.
Ref: Wikipedia
The extent of polymerization will determine the ___.
Molecular weight.
Ref: Lecture Notes CH14
What is the key characteristic of polymeric materials?
Molecular weight
Ref: Lecture Notes CH14
If the polymer chain length is increased, what corresponding change in properties will take place?
- Increased melting point.
- Increased viscosity
- Increased impact resistance
- Increased strength and toughness
“My Very Independent Idiot.”
Ref: Lecture Notes CH14
Give some reason why increasing chain length gives desirable property changes.
- Increase in chain interactions (van der Waals forces) as the density of entanglements increases.
- The presence of number one results in stronger bonding which enables resistance against deformation.
Ref: Lecture Notes CH14
What is the “Degree of polymerization?”
The average number of repeat units per chain.
Ref: Lecture Notes CH14
What are the four main molecular structures for polymers?
Linear
Branched
Cross-Linked
Network
“Lary Bought Cable News.”
Ref: Lecture Notes CH14
