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Synthesis and characterization of polyamides X 18

Authors

  • Xiaowen Cui,

    1. College of Chemistry and Chemical Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
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  • Weihua Li,

    1. College of Chemistry and Chemical Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
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  • Deyue Yan,

    Corresponding author
    1. College of Chemistry and Chemical Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
    • College of Chemistry and Chemical Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
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  • Cuiming Yuan,

    1. Università di Milano, Dipartimento di Chimica Organica e Industriale, via Venezian 21, Milano, Italy
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  • Giuseppe Di Silvestro

    1. Università di Milano, Dipartimento di Chimica Organica e Industriale, via Venezian 21, Milano, Italy
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Abstract

Step heating melt polycondensation was adopted in the preparation of polyamides based on 1,16-octadecane diacid and α,ω[BOND](CH2)2n diamines (n = 1–6). The structure was confirmed by various spectroscopic techniques (IR, Raman, 1H-NMR, and 13C-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) × 104 Da for all polyamides under consideration. An excellent correlation between size exclusion chromatography and 1H-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

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