SynthesizationNylons can be made from diacid chlorides anddiamines. Nylon 6/6 is made from themonomers adipoyl chloride and hexamethylenediamine.0NH2+H2N0hexamethylene diamineadipoyl chlorideHHOnylon6,6
Synthesization Nylons can be made from diacid chlorides and diamines. Nylon 6/6 is made from the monomers adipoyl chloride and hexamethylene diamine
SynthesizationHNHHOH0hexarmnethylenediamineadipic acidHH9nylon 6,6
Synthesization
SynthesizationAnother kind of nylon is nylon 6. It is made by aring opening polymerizationfrom the monomercaprolactam.0H0→←CH-CH-CH2-CH2-CH2-C-N+Hnylon 6s-caprolactam
Synthesization Another kind of nylon is nylon 6. It is made by a ring opening polymerization from the monomer caprolactam
StructurePolyamides are linear polymers with repeatingamide linkages along their chain. The amidegroups are strong polar, and can form hydrogenbond with each other. Because of this, andbecause the nylon backbone is very regular andsymmetrical, nylons are often crystalline, andmake very good fiber
Structure Polyamides are linear polymers with repeating amide linkages along their chain. The amide groups are strong polar, and can form hydrogen bond with each other. Because of this, and because the nylon backbone is very regular and symmetrical, nylons are often crystalline, and make very good fiber
Propertyhigh strength (especially at high temperatures)tensile, and flexural strengths from freezingtemperatures up to 300 oF , high tough at lowtemperatures, good impact, stiffnessexcellentfatigueresistanceabrasion resistant ,low coefficient of frictiongood electrical resistivitiesgood chemical resistance against organic solventsand alkalis,but are easily attacked by acids andoxidizing agentsretain useful mechanical properties over a range oftemperatures from -60~400 oF
Property ◼ high strength (especially at high temperatures), tensile, and flexural strengths from freezing temperatures up to 300 oF , high tough at low temperatures, good impact, stiffness ◼ excellent fatigue resistance ◼ abrasion resistant ,low coefficient of friction ◼ good electrical resistivities ◼ good chemical resistance against organic solvents and alkalis,but are easily attacked by acids and oxidizing agents ◼ retain useful mechanical properties over a range of temperatures from –60~400 oF