True

False

True

False, Tensile strength is related to the maximum force that a polymer can withstand before it breaks.

False, Toughness is related to the energy a polymer can absorb before it breaks.

True

False, brittleness is the opposite of toughness

True

False, a polymer with high elastic modulus is easy to bend

True

False, The number average molecular weight is usually lower than the weight average molecular weight.

True

False, It has a wide molecular weight average.

The different tensile strength

Process similarly

Q=6 will be easier to process and have lower tensile strength than Q=2

Q=6 will be easier to process and have higher tensile strength than Q=2

A will be able to develop a higher degree of crystallinity than B

A will have a better heat resistance than B

A will have a lower density than B

A will be stronger than B

B will be stronger than A

B will be easier to process than A

A will be easier to process than B

True

False, Polymers are typically stronger in the cross direction.

True

False, Melting temperature is the temperature at which the polymer transitions from glassy to rubber-like

False, The glass transition temperature is the temperature at which materials turn from rubber-like to liquid

True

False, branched polymers in general are expected to have higher crystallinity than linear polymers

True

False, Unplasticized PVC is expected to have a lower Tg than plasticized PVC

B, lower crystallinity= higher density

A, higher crystallinity= higher density

A, was strectched

B, was cooled faster than A.

It has something to do with thermomechanical history

B was cooled slower than A.

Anisotropic

Isotropic

isotactic

Anisotropic

Isotropic

Isotactic

2,3,4,1

1,2,3,4

4,2,1,3

2,1,4,3

all up or down

no pattern

pattern that is repeatable

no pattern

pattern that's repeatable

all up or down

Pattern that's repeatable

all up or down

no pattern

increases strength

is unbalanced

is weakened in the perpendicular direction

Improves tensile strength

Machine Direction

Cross Direction

very large molecules

small molecules

linked by covalent bonds

macromolecule characterized by repeated repetitions of monomers linked covalently

A plastic characterized by repeated repetitions of monomers linked covalently

basically a plastic

composed of only a single monomer

composed of 2 monomers but they wear the same hats to a party

gay polymers

The happiest of all polymers!

composed of one monomer that is syndiotactic

composed of 2+ monomers

ABABAAABBBBBBABAABBBABAABABABABABABBABABAAAAABBA

ABABABABABABABAB

AAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAAAABBBBBBBBBB

AAAAAAAAAAAAAA

BBBB BBBB

ABABABABABABAB

ABBABABABABABABAAAAAABABBBBABAAABAB

BBBBBBAAAAAAABBBBBBAAAAABBBBBAAAAAA

AAAAAAAAAAAAAA

BBBBBB BBBBB

BABABABABABABABABABABABABABA

BBBBAAAABBBBAAAABBBBAAAABBBBAAAA

BBBBBBBBBBBBBB

AAAA AAAA

ABABABAAAABBBBBAAAABBBABABABABBABABABA

ABABABABABABAB

BBBBAAAABBBBAAAA

AAAAAAAAAAAAAA

BBBB BBBB

ABBABBBBAAAABBABABABBABAABABABABABAB

___________

__/____/____/

\ \

-------------

__/_____/_

/ / /

_____________

/-/\/\//-//-/\\/\-

-----------------------

__/_____/

\ \

_____________

/-/\/\//-//-/\\/\-

-----------------------

--------------------

makes up a polymer

tiny dudes

make polymers with more than one monomer base

makes polymers with a single monomer base

How the size of a molecule is referred to

All of the molecules added together then divided by a single monomer

relates to the molecular mass and the monomer.

$$M_m=\frac{n}{M}$$  

$$M=\frac{n}{M_m}$$  

$$n=\frac{M}{M_m}$$  

total mass of the sample divided by the total number of molecules

1.multiply all numbers by molecules

2.add up all of the #s from 1

3. divide by the total number of molecules.

1. square the number of molecules for each one

2.multiply the molecules squared by the number of molecules

3. add up all #s from 2

4 .multiply all numbers by molecules

5.add up all of the #s from 4

6.divide step 3 by step 5

Based on the total weight of all molecules in a sample

1. square the number of molecules for each one

2.divide the molecules squared by the number of molecules

3. add up all #s from 2

4 .multiply all numbers by molecules

5.add up all of the #s from 4

6.divide step 3 by step 5

1. square the number of molecules for each one

2.multiply the molecules squared by the number of molecules

3. add up all #s from 2

4 .multiply all numbers by molecules

5.add up all of the #s from 4

6.divide step 3 by step 5

1. square the number of molecules for each one

2.multiply the molecules squared by the number of molecules

3. subtract all #s from 2

4 .multiply all numbers by molecules

5.add up all of the #s from 4

6.divide step 3 by step 5

Q= $$\frac{M_w}{M_n}$$  

Q= $$\frac{M_n}{M_w}$$  

the smaller the Q the more narrow and has better mechanical properties, and flow properties

the higher the Q the more narrow and has better mechanical properties, and flow properties

How tough something is in tension

Deals with tear strength, creep, toughness,....

True

False, The larger the modulus of elasticity the more stiff a polymer is.

decreases as crystallinity increases

increases as crystallinity increases

is the clarity of a polymer

is how a polymer survives in this great big world

percent of light deviates more than

.025%

percent of light deviates more than

.25%

percent of light deviates more than

25%

percent of light deviates more than

2.5%