Nylon-6 copolymers: Copolymerization with α-amino acids

✍ Scribed by Minoru Nagata; Tsuyoshi Kiyotsukuri

• Book ID: 103072463
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 273 KB
• Volume: 28
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(92)90058-a

✦ Synopsis

Alanine (Ala), leucine (Leu), phenylalanine (Phe) and lysine hydrochloride (Lys. HCI) were incorporated in nylon-6 by melt polycondensation. The reduced specific viscosities of the polymers decreased with increasing comonomer content, in the order Ala > Leu ~ Pbe > Lys. HCI. Glass transition temperature (Ts), cold crystallization temperature (T=) and melting temperature (Tin) were measured by differential thermal analysis. Tm decreased in the order Ala > Leu > Phe ~, Lys. HCi. 7", increased slightly with increasing comonomer content. The ease of crystallization, indicated by (T=-Ts), decreased in the order Ala > Leu > Phe >> Lys. HCI. Heat resistance, measured by thermogravimetry, decreased in the same order. Weight loss on alkali hydrolysis increased with increasing comonomer content. The copolymer with Lys • HC1 showed the largest weight loss suggesting biodegradability. Acid dyeability could be greatly improved by the incorporation of 1-2 mol% Lys-HCI.