Takayanaga model

Engberg and coworkers [14,98] investigated the blends of thermotropic PLCs with fully amorphous polymers polyethersulfone (PES), polycarbonate (PC) and aromatic poly (ester carbonate) (APEC) [98] and semicrystalline polymers like polybutylene terephthalate (PBT) [14]. aL was calculated according to the Takayanaga model [101] as follows ... 

PLC and PES were found to be incompatible and formed a self-reinforced system. The chain orientation of the PLC component was constant in the melt flow direction (Hermans orientation function, defined by equation 8.6, s = 0.39 + 0.03) in these blends. The aL parallel to the melt flow direction was always lower than that in the lateral direction. Values of ay of PES + PLC blends decreased markedly in an almost linear manner with increasing PLC content. There is moderate increase in aj. A comparison with the Takayanaga model [101] gives the best fit value for b — 0.50. A slight deviation between predicted and experimental values was obtained for the blends with 60 to 80% PLC, showing a higher b value due to the greater reinforcement. 

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