Fundamentals
Crystallinity
Thermal Properties
Mystery
Grab Bag
100
The inter-atomic forces that are characterized by the sharing of electrons.
What are covalent bonds?
100
This is the building block of a crystal.
What is a unit cell?
100
This type of motion occurs when the amorphous polymer chains are above Tg (glass transition temperature).
What is long range segmental motion?
100
The weight average is usually higher than the number average when calculating the molecular weight averages. True or False?
What is true?
100
This was the year that Titanic was released.
What is 1997?
200
This type of thermoplastic, under the right conditions, will form highly ordered crystalline structures.
What is semi-crystalline?
200
This image is a depiction of...
What is a spherulite?
200
Tm (Melting Temperature) is only observed by this type of polymer.
What is semi-crystalline?
200
When writing the chemical structure by showing the repeating unit, surrounded by brackets and then a subscript "n"- what does the "n" tell us?
What is the number of repeating units or the degree of polymerization?
200
This chemical element has the symbol "Pt" on the periodic table.
What is platinum?
300
A polymer made from two constitutional units.
What is a copolymer?
300
In the crystalline portion of most polymers, the polymer chains fold back on themselves to form these.
What is a lamella?
300
Pendant groups in the chemical structure that act as "elbow room" have this influence on Tg.
What is lower/decrease Tg?
300
Crystallization is considered this type of reaction because the DSC heater is contributing less heat to the polymer.
What is exothermic?
300
This is the longest venomous snake in the world.
What is the King Cobra?
400
A polymer that has all of the "r" groups on one side of the molecule has this type of tacticity.
What is isotactic?
400
Of these 2 polymers, atactic polystyrene and syndiotactic polystyrene, this polymer would have a HIGHER crystallinity.
What is syndiotactic?
400
These are small molecules that keep molecular chains apart and allow more movement at lower temperatures but may also increase permeation.
What are plasticizers?
400
The increase of copolymer and plasticizers both have this influence on glass temperature & melting temperature.
What is decrease?
400
This musician is the godmother to Elton John's sons.
Who is Lady Gaga?
500
In thermoplastics, the molecules are linked by this type of chemical bond.
What are secondary forces or Van Der Waals forces?
500
Molecules which go between and connect with two lamellae are known as these.
What are tie molecules?
500
A plastic container that has a Tg of around 75 degrees C will be in this condition at room temperature.
What is glassy/stiff/brittle?
500
This is a phenomenon that occurs when a slowly crystallizing material is combined with a rapid cooling.
What is frozen-in-amorphousness?
500
Tom Hanks, Michael Keaton, Ellen DeGeneres, and Owen Wilson all have this in common.
What is voice a Pixar character?