SYNOPSISThe miscibility in the melt and solid state of blends made of poly(p-phenylene sulphide) (PPS) with a liquid crystalline polymer (LCP) from DuPont was studied by polarized light optical microscopy (PLOM) and dynamic thermal mechanical analysis. Both techniques showed that the PPS and the LCP are immiscible in both states, and that the critical concentration for the formation of fibrils C*, in this particular system, was located between 20 and 25 wt % LCP. The resultant blend morphology was studied by PLOM and scanning electron microscopy (SEM). It was observed that when LCP fibrils are formed in the PPS matrix, the PPS macromolecules will crystallize around the LCP fibrils by forming columnar layers called transcrystallites. These transcrystallites are the result of the LCP acting as a nucleating agent for the PPS, promoting heterogeneous nucleation. 0 1996 John Wiley & Sons, Inc.
The main advantage of the 'in situ" production of blends of thermoplastics with liquid crystalline polymers (LCP's) is viscosity reduction. In this work the phase behavior of blends of poly p-phenylene sulphide (PPS) with two different LCP's is presented. The LCP's are HXlOOO (amorphous) and HX4000, crystalline, both from DuPont. The samples were prepared by injection molding and its dynamic mechanical properties were tested after annealing. It was observed that before annealing the blends were slightly miscible at all concentrations. It was also observed a plasticization of the PPS amorphous fraction by the LCP amorphous part. After annealing an increase of the PPS glass transition temperature was observed, the blends were also find to be immiscible. An average P-transition was observed at aproximately 76 O C (HX1000) and at 88 "C (HX4000); the glass transition temperatures were 160.48 O C (HX4000) and 171.77 O C ~l000).
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