Nylon 7, the polyamide from 7-aminoheptanoic acid, was discovered by coincidence by Manasse in 1902' who obtained the multiple of C,HlaNO-NH(CH2)LDwhen heating 7-aminoheptanoic acid to determine its melting point. Although, based on the fundamental work on polyamides by Carotheq2 polyamide fibers such as nylon 6 (polycaproamide) and nylon 66 (polyhexamethyleneadipamide) experienced a worldwide growth during the past twenty years, relatively little became known about nylon 7 (polyheptanamide). Laboratory samples of nylon 7 were prepared by academic routes, e.g., suberone + suberoneoxime + enantholactam ;3 pimelonitrile + 7-aminoheptanonitrile + 7-aminoheptanoic acid,4 and a few properties of the polyamide were determined. Wiloths conducted kinetic measurements on the polycondensation of 7-aminoheg tanoic acid, and Schaafa studied the polymerization of the enantholactam. During the past few years, however, a group of Russian researchers7 developed a process for 7-aminoheptanoic acid via telomerization of ethylene with carbon tetrachloride to the 1,1,1,7-tetrachloroheptane and its subsequent hydrolysis and amination. The development of a nylon 7 fiber based on this monomer synthesis has been reported to be under study.An industrially feasible synthesis for ethyl-7-aminoheptanoate, a monomer for nylon 7, and a simple polycondensation process to the high molecular weight polyamide were developed in this laboratory. Moreover, a detailed study of the fiber properties of this polymer was carried out.
1,4368--1,4396 1,4442 -1,4976 -7-Aminoheptansaureester Iassen sich in vier Stufen aus E-Caprolacton darstellen. Diese Synthese zusammen mit einem einfachen Verfahren zur Polykondensation gibt die Moglichkeit zur groJtechnischen Produktion von Nylon 7. Dieses Polyamid unterscheidet sich von Nylon 6 und 6.6 nur wenig, zeigt aber in einigen Eigenschaften (Najfestigkeit, Elastizitatsmodul, Dehnungserholungsvermogen usw. nach dem Tempern in kochendem Wasser) ein etwas giinstigeres Verhalten.
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