Nylons properties

Table 5. Effect of Clay Filler on Nylon Properties ...

Nylon properties are greatly affected by the amount of crystallinity, which in turn is controlled, to a great extent, by the cooling of the polymer. A slowly cooled nylon will have greater crystallinity, in the range of 50-60%. A rapidly cooled nylon will have crystallinity as low as 10%. In addition, slowly cooled nylon contains larger crystals than when rapidly cooled. 

The hydrogenation reaction takes place in the presence of a Raney nickel catalyst at 120-150°C (250-300°F) and 5000 psig. Nylon properties are sensitive to impurities in the feedstock so the reaction and purification steps for both adiponitrile and hexamethylene diamine are carried out to minimize by-products and impurities in the HMDA product. The hydrogenation of adiponitrile is carried out in a large quantity of ammonia which prevents the formation of hexamethyleneimine by-product. Ammonia also acts as a heat transfer fluid and helps maintain the reaction temperature. The conversion of adiponitrile is nearly 100% and the selectivity to HMDA is 97% giving an overall yield of HMDA from adiponitrile of 96.7%. 

Nylon properties are affected by the amount of crystallinity. This can be controlled to a great extent in nylon polymers by the processing conditions. A slowly cooled part wUl have significantly greater crystallinity(50 to 60 percent) than a rapidly cooled, thin part (perhaps as low as 10 percent). Not only can the degree of crystallinity be controlled, but also the size of the crystallites. In a slowly cooled material, the crystal size will be larger than for a rapidly cooled material. In injection molded parts where the surface is... 

Nylon properties that contribute to automotive applications include compressive, flexural, torque strength, toughness resistance to creep, fatigue, wear, oUs, grease, and underhood chemicals limitation of PV and NVH abatement. 

PP, polypropylene PC, polycarbonate PBT, polybutylene terephthalate PS, polystyrence. Nylon properties are very sensitive to moisture content. 

Uses Surfactant, leveling agent, barrd covering agent for acid dyes on nylon Properties Yel. liq. sp.gr, 1,09 35% act,... 

Uses Fabric softener base for brushed or raised fabrics, elastomeric finishes, for cotton, rayon, acetates, wool, and nylon Properties Lt. yellowish flakes disp. in hot water pH 4 100% cone. 

Uses Antistat, softener for syn. and natural fibers substantive on wool and nylon Properties Liq. 

Uses Leveling and dispersing agent for disperse dyes on polyester and nylon Properties Liq. 25% cone. 

Uses Coemulsifier, leveling agent for the differential dyeing of nylon Properties Yel, solid water-sol, HLB 17,5 100% cone. 

Uses Leveling agent for use with disperse or neutral acid dyes on nylon Properties Cl. liq. sol. forms cl. sol ns. in water pH 7.5 (2%)... 

Uses Wetting agent, level dyeing assistant for acid dyes on nylon Properties Liq. 55% cone. 

Chem. Descrip. EO condensate, modified Ionic Nature Amphoteric Uses Dyeing and printing aux. for nylon Properties Liq. 

Chem. Descrip. Alkylamine polyglycol ether Ionic Nature Cafionic Uses Leveling agent for nylon Properties Liq. 

Uses Leveling agent for applic. of acid, chrome, premetalized, and reactive dye-stufis to wool, silk, nylon Properties Liq. 

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