1 research outputs found
Cross-Linked Polyamides Synthesized through a Michael Addition Reaction Coupled with Bulk Polycondensation
A simple
route is described to synthesize cross-linked polyamides
(cPAs) with excellent mechanical properties at mild conditions through
a Michael addition reaction coupled with bulk polycondensation. A
Michael addition of methyl acrylate with 1,6-hexanediamine was conducted
in a bulk state at a N–H/CC molar ratio of 1:1 under
normal pressure at 50 °C, and a hexanediamine-tetraester was
prepared. Bulk polycondensation of the hexanediamine-tetraester with
1,6-hexanediamine and isophoronediamine was conducted at 170 °C
for 1 h and then in tetrafluoroethylene mold under reduced pressure
for another 8 h. A series of cPA films were prepared. The Michael
addition and the polycondensation were monitored by Fourier transform
infrared, <sup>1</sup>H NMR, and electrospray ionization mass spectrometry
spectra. The cPA films were characterized with differential scanning
calorimetry, thermogravimetric analysis, dynamic mechanical analysis,
and a tensile test. These cPAs exhibited <i>T</i><sub>g</sub> ranging from 37 to 61 °C, tensile strength up to 71 MPa, and
strain at break of about 11%