Section 2 - Polyamides: Step Growth Polymerization
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29 Terms
amide
What is the functional group of polyamides?
hydrogen bonding
Amides are capable of forming ____ with other units.
aliphatic, semi-aromatic, aromatic
What are the three classifications of polyamides?
nylon 6
What is an example of aliphatic polyamides?
polyphthalamides (PPA)
What is an example of semi-aromatic polyamides?
polybenzimidazole (PBI)
What is an example of aromatic polyamides?
flexible
Aliphatic polyamides are more ____ than aromatic polyamides.
stiff
Aromatic polyamides are more ____ than semi-aromatic polyamides.
aliphatic
What classification is this polyamide?
semi-aromatic
What is the classification of this polyamide?
aromatic
What is the classification of this polyamide?
tensile strength, elasticity, abrasion resistance, and melting temperature
Nylon has good…
plastic
Nylon is a thermo____
diamine, dicarboxylic acid, diacid chloride
Polyamides can be synthesized through ____ and _____ or ______
phenol
Adipic acid is derived from _____
adipic acid
Diamine can be derived form ____
.
take this time to practice Nylon 6,6 reaction mechanism from hexamethylene diamine and adipic acid (6 carbons).
increases
Interchain hydrogen bonding _____ melting temperature, strength, and durability.
para (p)
Kevlar has a ___ orientation of its substituents.
meta (m)
Nomex has a ___ orientation of its substituents.
heat resistance, impact resistance, and strength
Properties of Kevlar include…
polymer solubility is low
An issue of kevlar is the…
interfacial polymerization
Kevlar is synthesized by _____
hydrogen bonding, pi-pi interaction, restriction at CN bond
Kevlar has a high degree of crystallinity because…
high tensile strength and non-flammable
Nomex properties include…
rigidity
Para substitution leads to increased ____ along the polymer chain.
enzymes, open structure
Natural polyamides are biodegradable because ____ are able to attack their structure due to their ___ ____.
unstable bonds, blending with biodegradable fillers, synthesis from biobased monomers
Polyamides can be made biodegradable by…
heat, salt
You have to ___ the nylon synthesis between a dicarboxylic acid and a diamine because the reactants will form ___ if you don’t.