Nylon bonding

Thermal Stability of Nylon-Bonded RDX , NOTS 1271, NAVORD 4949 (1955) 13) K.S. 

A High-Energy, High-Strength, Nylon-Bonded Explosive , NOTS TP 2456, NAVWEPS 7057 (1960) 33) P.E. Shea C.W. Falterman,... 

The recommended cements for nylon-to-nylon bonding are generally solvents, such as aqueous phenol, solutions of resorcinol in alcohol, and solutions of calcium chloride in alcohol, sometimes bodied by the inclusion of nylon in small percentages. 

In a study of aluminum-epoxy adhesive joints, Dillingham and Boerio" used XPS analysis to determine that, after humid aging, the locus of fracture was within the metal oxide. They further proposed that catalysis during setting by acidic hydroxyls on the oxide caused the epoxy near the oxide to be more crosslinked than the bulk epoxy network. Another researcher" showed that fracture progressed within a weak boundary layer when a polyvinylidene fluoride-nylon bond was ruptured. 

The leader of DuPont s effort was Wallace H Carothers who reasoned that he could reproduce the properties of silk by constructing a polymer chain held together as is silk by amide bonds The neces sary amide bonds were formed by heating a dicar boxylic acid with a diamine Hexanedioic acid adipic acid) and 1 6 hexanediamme hexamethylenedi-amine) react to give a salt that when heated gives a polyamide called nylon 66 The amide bonds form by a condensation reaction and nylon 66 is an example of a condensation polymer... 

Polyamide (Section 20 17) A polymer in which individual structural units are joined by amide bonds Nylon is a syn thetic polyamide proteins are naturally occurring polyamides... 

Stereochemistry. Cyclohexane can exist ia two molecular conformations the chair and boat forms. Conversion from one conformation to the other iavolves rotations about carbon—carbon single bonds. Energy barriers associated with this type of rotation are low and transition from one form to the other is rapid. The predominant stereochemistry of cyclohexane has no influence ia its use as a raw material for nylon manufacture or as a solvent. 

In the calendering method, a PVC compound which contains plasticizers (qv) (60—120 phr), pigments (qv) (0—10 phr), fillers (qv) (20—60 phr), stabilizers (10—30 phr), and other additives, is kneaded with calender roUs at 150—200°C, followed by extmsion between clearance-adjusted roUs for bonding onto the substrate. This method is employed for products with thick PVC layers, ie, of 0.05—0.75 mm thickness. The main plasticizer used is di-2-ethylhexyl phthalate (DOP). For filler to reduce cost, calcium carbonate is mainly used. A woven or knit fabric made of cotton, rayon, nylon, polyester, and their blend fiber is used as substrate. For foamed vinyl-coated fabrics, the bonded materials are heated in an oven to decompose the foam-blowing... 

The diacids for these polymers are prepared via different processes. A2elaic acid [123-99-9] for nylon-6,9 [28757-63-3] is generally produced from naturally occurring fatty acids via oxidative cleavage of a double bond in the 9-position, eg, from oleic acid [112-80-1] ... 

Nylon is the preferred fiber for flocking because of its good chemical bonding to a wide range of adhesives, its toughness, and its ease of dyeabiHty and printabihty. Nevertheless, the tow must be manufactured with the proper ktex, cohesion, and spin finish to be readily converted to flock (133). 

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