Lecture # 4. MONOMERS: BUILDING BLOCKS FOR POLYMER MANUFACTURE : The paraffins ((like methane ) are unable to polymerize due to lack of a double bond-hence they are not considered to be monomers.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Lecture # 4
MONOMERS: BUILDING BLOCKS FOR POLYMER MANUFACTURE:
The paraffins ((like methane )are unable to polymerize due to lack of a double bond-hence they are not considered to be monomers.
Ethylene, on the other hand, represents the simplest and most commonly used monomer, essentially due to the existence of an aliphatic double bond that starts the polymeric chain.
Phenyl gp(bz ring) ,styrene
a.is the formation of polyamide (in our case Nylon 6-6) by reacting a di-acid with a diamine.
b.Let us consider a condensation reaction of
monofunctional groups, like classical esterification:
Condensation Polymerization Characteristics
e.g., n .HO-CH2CH2CH2CH2COOH
-(-CH2CH2CH2CH2COO-)n- + nH2O
n . HO-R-COOH -(-R-COO-)n- + nH2O
Condensation Polymerization — Esterification
n.HOOC-C6H4-COOH + n.HO-CH2CH2-OH
-(-OOC-C6H4-COO-CH2CH2-)n + 2nH2O
n H2N-(CH2)5-COOH (-(CH2)5-CONH)n + nH2O
hexamethylene diamine + adipic acid
Problem — Nylon 6,6
Calculate the masses of hexamethylenediamine and adipic acid needed to produce 1000 kg of nylon 6,6.
nH2N-(CH2)6-NH2 + nHOOC-(CH2)4-COOH -(-HNOC-(CH2)4-CONH-(CH2)6-)n+ 2nH2O
C6H16N2+ C6H10O4C12H22O2N2+ 2H2O
72+16+28 + 72+10+64 144+22+32+28 +2x18
116 +146 226 +36
513 kg HMDA + 646 kg adipic acid Note: 159 kg of H2O byproduct