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Synthesis and characterization of copolyamides derived from novel aliphatic bio‐based diamine
Author(s) -
Rwei S.P.,
Ranganathan P.,
Chiang W.Y.,
Lee Y.H.
Publication year - 2018
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.46878
Subject(s) - diamine , polyamide , polymer chemistry , thermal stability , monomer , glass transition , materials science , fourier transform infrared spectroscopy , intrinsic viscosity , polymerization , salt (chemistry) , ultimate tensile strength , copolymer , nuclear chemistry , chemistry , polymer , chemical engineering , organic chemistry , composite material , engineering
Novel aliphatic nylon 6 (PA6) copolyamides were produced by melt polymerization reaction of our newly synthesized aliphatic bio‐based diamine monomer: N 1 , N 6 ‐bis (4‐aminobutyl) adipamide (BABA). The pertinent long‐chain polyamide salt (BABA/SA) monomer was isolated as white solid, utterly characterized for the first time. The chemical structure of BABA, BABA/SA salt, and copolyamides (PA6‐BABA/SA) were investigated by 1 H NMR and FTIR spectroscopy. Depending on the chemical compositions, the viscosity and molecular weight of the copolyamides were in the range of 20 275–12 652 and 2.81–2.12 dL/g. With increasing BABA/SA salt weight content in the synthesized copolyamides, their melting temperatures ( T m ) and glass transition temperatures (Tg) decreased from 211.0 to 164.0 °C and 66.6 to 43.5 °C. In addition XRD results were investigated revealing all the copolyamides transferred from α‐form to γ‐form. Interestingly, the as‐synthesized all copolyamides possess nearly similar thermal stability ( T d = 452.2–449.5 °C) as neat PA6. Mechanical testing data revealed that with increasing BABA/SA salt content, the elongation at break of copolyamides are increased (726.19–429.34%), while the tensile strength are decreased. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46878.