Abstract:

Composites based on thermal liquid crystalline polymer (TLCPa) and polyamide 6 (PA6) were prepared using a solutionmixing technique in this study. Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), wide angle Xray diffractometry (WAXD) and polarizing optical microscope (POM) were applied to study the compatibility, thermal stability and crystallization behaviour. The addition of TLCPa enhanced the thermal stability of PA6. The degradation onset temperature of composites with 30% TLCPa in weight increases nearly 27 ℃ rather than pure PA6. This is due to the increase of miscibility induced by the intermolecular interactions between these polymers. Crystallization behavior revealed that the TLCPa inhibited the orientation of polymer chain resulting in the decreases in crystallinity, but no effects on crystal modification manifested also by XRD spectra. XRD spectra of amorphous state appeared when the addition of TLCPa over 40% in weight.Crystal morphology refinement was observed by polanized optical microscopy(POM).

Key words: materials synthesis and processing technology, polyamide 6, thermal liquid crystalline polyamide(TLCPa), thermal stability, crystallization behaviour