Melt processing and filler/matrix interphase in carbon nanotube reinforced poly(ether-ester) thermoplastic elastomer


  • Presented at POLYCHAR 15 World Forum on Advanced Materials, April 16–20, 2007, Buzios, Rio de Janeiro, Brasil.


Multiblock poly(ether-ester) thermoplastic elastomers (PBT/PTMO) are based on semicrystalline poly(butylene terephthalate) (PBT) and amorphous oxytetramethylene (PTMO) blocks. The copolymer was compounded with a filler content up to 10 wt% multi wall carbon nanotubes (MWCNTs) via a masterbatch process, which included milling, high shear mixing in the melt, and extrusion using a twin-srew extruder. From the compound several compositions of PBT/PTMO with 0.1–2.0 wt% of MWCNTs were prepared. Differential scanning calorimeter analysis showed that the fillers enhance initiation of recrystallisation, i.e. accelerate the nucleation of crystalline segments of PBT/PTMO. The morphology of the obtained nano-composites shows that MWCNTs are well dispersed in the matrix. Only some discrete nanotubes, apparently protruding from the matrix, could be distinguished on the fracture surface, still covered with a thin interphase matrix layer of PBT/PTMO. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers