Nylon (Polyamide)


Celanese Nylon polyamide  [c.262]

The first 6 m nylon 66 stands for the number of carbons m the diamine the second for the number of carbons m the dicarboxylic acid Nylon 66 was an im mediate success and fostered the development of a large number of related polyamides many of which have also found their niche in the marketplace  [c.868]

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  [c.1291]

We only need to recall the trade name of synthetic polyamides, nylon, to recognize the importance of these polymers and the reactions employed to prepare them. Remember from Sec. 1.5 the nylon system for naming these  [c.305]

As with polyesters, the amidation reaction of acid chlorides may be carried out in solution because of the enhanced reactivity of acid chlorides compared with carboxylic acids. A technique known as interfacial polymerization has been employed for the formation of polyamides and other step-growth polymers, including polyesters, polyurethanes, and polycarbonates. In this method the polymerization is carried out at the interface between two immiscible solutions, one of which contains one of the dissolved reactants, while the second monomer is dissolved in the other. Figure 5.7 shows a polyamide film forming at the interface between an aqueous solution of a diamine layered on a solution of a diacid chloride in an organic solvent. In this form interfacial polymerization is part of the standard repertoire of chemical demonstrations. It is sometimes called the nylon rope trick because of the filament of nylon produced by withdrawing the collapsed film.  [c.307]

Chemical Reactions. The reactions of dimer acids were reviewed hiUy ia 1975 (13). The most important is polymerization the greatest quantities of dimer acids are incorporated into the non-nylon polyamides. Other reactions of dimer acids that are appHed commercially include polyestetification, hydrogenation, esterification, and conversion of the carboxy groups to various nitrogen-containing functional groups. Table 5 summarizes the nonpolymeric chemical reactions of dimer acids. Polymerization reactions of dimer acids include polyamidation (34—36), polyestetification (37—39), reactions resulting in polymeric nitrogen derivatives other than polyamides (40—42), and reactions involving dimer diprimary amines (43,44).  [c.114]

Nonreactive Polyamide Resins. The non-nylon dimer based polyamide resins are characteri2ed by lack of crystallinity, relatively low softening points, adhesiveness, hydrophobicity and, generally, relatively low transition-temperature ranges. These properties contrast sharply with the crystallinity and high melting temperatures of the nylon polyamides (qv) based on C to dibasic acids and are sufficiendy unique to carve out large markets of theh own (13,82). About 65% of dimer use is in this area, according to one recent estimate (71).  [c.117]

Group VI. Nylon (Polyamide) Resins Nylon (polyhexamethylene adipamide) polymer >10 6,7 1.8 95 4.000 500 430 0.020 0.030 Cl 3  [c.525]

Nylon A class of synthetic fibres and plastics, polyamides. Manufactured by condensation polymerization of ct, oj-aminomonocarboxylic acids or of aliphatic diamines with aliphatic dicarboxylic acids. Also rormed specifically, e.g. from caprolactam. The different Nylons are identified by reference to the carbon numbers of the diacid and diamine (e.g. Nylon 66 is from hexamethylene diamine and adipic acid). Thermoplastic materials with high m.p., insolubility, toughness, impact resistance, low friction. Used in monofilaments, textiles, cables, insulation and in packing materials. U.S. production 1983 11 megatonnes.  [c.284]

Polyamides from diamines and dibasic acids. The polyamides formed from abphatic diamines (ethylene- to decamethylene-diamine) and abphatic dibasic acids (oxabc to sebacic acid) possess the unusual property of forming strong fibres. By suitable treatment, the fibres may be obtained quite elastic and tough, and retain a high wet strength. These prpperties render them important from the commercial point of view polyamides of this type are cabed nylons The Nylon of commerce (a 66 Nylon, named after number of carbon atoms in the two components) is prepared by heating adipic acid and hexamethylenediamine in an autoclave  [c.1019]

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  [c.868]

The polyamides poly(hexamethylene sebacamide) and poly(hexamethylene adipamide) are also widely known as nylon-6,10 and nylon-6,6, respectively. The numbers following the word nylon indicate the number of carbon atoms in the diamine and dicarboxylic acid, in that order. On the basis of this same system, poly (e-caprolactam) is also known as nylon-6.  [c.22]


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Materials selection deskbook  -> Nylon (Polyamide)