Blends with masterbatch of OTPB modified MWNT show significant refinement in the phase dimension of PA6 phase as compared to the blends with p-MWNT, masterbatch of p-MWNT and masterbatch of Na-AHA modified MWNT.
Interestingly, blends with OTPB modified MWNT show a single crystallization exotherm at ~194[degrees]C i.
Further, blends with OTPB modified MWNT show a single crystallization exotherm for PA6 at ~194[degrees]C, again at a temperature lower than the crystallization temperature of PA6 in blends with MWNT or Na-AHA modified MWNT.
The second crystallization exotherm of PA6 is however, found to be absent for blends with OTPB modified MWNT (Fig.
Overall, significant increase is observed in the crystallization temperature of the PA6 in all blends with MWNT with an additional peak at higher temperature except for blends with OTPB modified MWNT.
Whereas in the case of blends with OTPB modified MWNT, the surface is likely to be partially covered with OTPB making the nucleation of PA6 lamella difficult for second crystallization exotherm.
All the blends with MWNT (MWNT/Na-AHA modified MWNT or OTPB modified MWNT) show single melting endotherm for PA6 around 220[degrees]C and a slight increase in melting temperature of PP and HDPE.
In summary, significant improvements in AC electrical conductivity of co-continuous binary (PA6/ABS), ternary (PA6/PP/ABS) and quaternary (PA6/PP/ABS/HDPE) polymer blends with MWNT pretreated with either Na-AHA or OTPB was achieved by utilizing masterbatch dilution approach mediated by specific interaction in conjunction with melt interfacial reaction during melt-mixing.