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Investigation on odd‐odd nylons based on undecanedioic acid: 1. Synthesis and characterization
Author(s) -
Cui Xiaowen,
Li Weihua,
Yan Deyue
Publication year - 2004
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1546
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , polyamide , glass transition , condensation polymer , fourier transform infrared spectroscopy , materials science , dynamic mechanical analysis , polymer chemistry , nylon 6 , raman spectroscopy , thermal analysis , inherent viscosity , intrinsic viscosity , infrared spectroscopy , analytical chemistry (journal) , polymer , chemistry , chemical engineering , organic chemistry , thermal , composite material , optics , meteorology , physics , engineering , thermodynamics
A series of odd‐odd polyamides were prepared through step‐heating melt‐polycondensation of undecanedioic acid with various diamines. The synthesized nylons were characterized comprehensively by means of elemental analysis, fourier‐transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), Raman spectra, intrinsic viscosity, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The intrinsic viscosities of the prepared polyamides except nylon 3 11 are 0.70 to 0.87 dl g −1 . The melting temperatures of the odd‐odd nylons range from 182 to 209 °C. In addition, the thermal mechanical properties of nylons 5 11, 7 11, 9 11 and 11 11 were analyzed using dynamic mechanical analysis (DMA). Nylon 3 11 could not undergo DMA due to its low molecular weight. The glass transition temperatures obtained from DMA are in the range 22–39 °C. Copyright © 2004 Society of Chemical Industry