Synthesis and characterization of polyamides X 18

✍ Scribed by Xiaowen Cui; Weihua Li; Deyue Yan; Cuiming Yuan; Giuseppe Di Silvestro

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 108 KB
• Volume: 98
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.22160

✦ Synopsis

Abstract

Step heating melt polycondensation was adopted in the preparation of polyamides based on 1,16‐octadecane diacid and α,ω(CH~2~)~2__n__~ diamines (n = 1–6). The structure was confirmed by various spectroscopic techniques (IR, Raman, ^1^H‐NMR, and ^13^C‐NMR). High molecular masses were obtained only in the presence of an excess of diamine and when the diamine possessed low volatility. The molecular masses were between (0.94 and 2.1) × 10^4^ Da for all polyamides under consideration. An excellent correlation between size exclusion chromatography and ^1^H‐NMR data was demonstrated in the measurement of the degree of polymerization. The melting temperatures of the polyamides decreased from polyamide 12 18 to polyamide 2 18 as the amide density along the molecular chain declined. No significant variation was observed in the glass‐transition and decomposition temperatures of the polyamides that were obtained. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1565–1571, 2005