Polycarbonate matrix viscosity

In the case of polycarbonate the addition of PET/PHB60 reduces, at high temperature,the dimensional stability of the composite blend. In fact the temperature of the shrinkage experiments is higher than the glass transition temperature of the LCP (35). In this case the nematic inclusions cannot act as solid fibers, but on the contrary act as internal lubricant particles, due to the low viscosity of the nematic phase, allowing then the complete relaxation of the amorphous matrix. 

In semicrystalline thermoplastic matrix composites, the nucleation and growth of a transcrystalline interface around the reinforcing fiber is thought to have a critical influence on the improvement of the stiffness and tensile strength [63-65]. The rheological behavior of in situ microfibrillar HDPE/PET and HDPE/polycarbonate (PC) polymer blends was investigated in a recent study [66,67]. For both HDPE/PET and HDPE/PC microfibrillar blends, the viscosity increased with PET and PC microfibrils concentration. In another study, Xu et al [68] reported that the flexible microfibrils of PET reduced the melt elasticity and viscosity of HDPE/PET microfibrillar blends. 

Melt processing has been successfully applied for the preparation of different polymer-CNT composites such as PP/CNT [211-213], PE/CNT [212-216], polycarbonate (PC)/CNT [217-219], PMMA/CNT [220-223], poly-oxymethylene/CNT [224], polyimide/CNT [225], PA6/CNT [226,227], and so on. The shear forces from the mix-ers/extruders should help break nanoparticle aggregates or prevent their formation. Unfortunately, the dispersion of CNTs in a polymer matrix is quite poor compared to the dispersion that may be achieved through solution mixing. In addition, the CNTs must be lower due to the high viscosities of the composites at higher loading of CNTs. 

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