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Synthesis and characterization of polyamides X 18
Author(s) -
Cui Xiaowen,
Li Weihua,
Yan Deyue,
Yuan Cuiming,
Di Silvestro Giuseppe
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22160
Subject(s) - polyamide , diamine , condensation polymer , polymer chemistry , polymerization , interfacial polymerization , glass transition , amide , materials science , size exclusion chromatography , polymer , chemistry , monomer , organic chemistry , composite material , enzyme
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