polymat 2 quiz 1

Vulcanization of rubber

thermoplastic elastomer

chain growth polymer

carbon cov

4

hydrogen cov

1

oxygen cov

2

nitrogen

3

Cl,fl,Br,Io

1

sulfur

2

aliphativ

can be linear or cyclical

can have saturated and unsaturated (double or triple) bonds”
less thermally stable, can ’

Aromatic

cyclic

thermally more stable

single and multiple bonds interact w each other for free flow across molecules

Benzene upon substitution

phenyl ring

ortho

meta

meta

amine

—NH2

Isocyanate

—N=C=O

urethane

carbonate

amide

urea

as MW of PE increases the —— approaches asymptotic value of —-

melting point, 145degree C

Low distribution of MW

high distribution of MW

High distribution of MW with an additional high MW component

number average (Mn)

Mn can be correlative with polymer colligative ie freezing point depression

Weight average MW

MW may be correllated with properties such as melt viscosity

Z average

MZ related to toughness

Polydispersity

shape of the distribution

order them for any polydisperse peak:
Mn mz MW

mn<mw<mz

dipole dipole or hydrogen bonding is stronger?

hydrogen bonding