Copolymers of telechelic poly(2,6-dimethyl-1,4-phenylene ether) segments with terephthalic methyl ester endgroups (PPE-2T, 3100 g/mol), uniform crystallizable tetra-amide units based on nylon-6,T (T6T6T, 13 wt%) and dodecanediol (C12) as an extender were made via a polycondensation reaction. The PPE-2T/C12/T6T6T copolymers are semi-crystalline materials with a glass transition temperature (Tg) of 169°C, a melting temperature (Tm) of 268°C and a very high Tg/Tm ratio of 0.82. The modulus is high up to the Tg and the modulus in the rubbery plateau after injection moulding is 10 MPa. The materials are slightly transparent and have good solvent resistance, low water absorption and good processability. With DSC it was calculated that the crystallinity of T6T6T in the copolymer is around 70%. The undercooling (Tm-Tc) as measured by DSC is 18°C at a cooling rate of 20°C/min. With WAXD it was shown that the tetra-amide units remain partially organized in the melt.
- high temperature materials
- Mechanical properties
- Segmented copolymers
- 4-phenylene ether)
Krijgsman, J., Feijen, J., & Gaymans, R. J. (2003). Synthesis and properties of segmented copolymers of polyphenylene ether and tetra-amide units. Macromolecular symposia, 199(1), 135-146. https://doi.org/10.1002/masy.200350912