Phase Morphology of Polyblends of Amorphous Polycarbonate and Semi-crystalline Polyethylene Terephth

Phase morphology, slate of compatibility and various properties of blends of polycarbonate (PC) with bottle-grade and fibre-grade polyethylene terephthalate (BPET and FPET, respectively) were investigated. It was found that these blends have two-phase separated morphology with partial miscibility. Scanning electron micrographs revealed separated domains of PC-rich and PET-rich zones. PC domains appear spherical increasing in size from 2 nrn for PC20IFPET80 up to about 5 μm for PC60IFPET40 blend. Further increase in PC content up to 80% caused phase inversion in which FPET appears asfinely dispersed domains in continuous PC matrix. To of PC-rich phase decreased from 153 '' C for pure PC down to 140 ''C for PC20IBPET80. Similar trend was observed in PCIFPET blends. Also, To of BPET-rich blend increases from 90 ''C for pure BPET up to 98 ''C for PC601BPEf40. Melting temperature of PET remains practically unchanged with partial compatibility of the blends. Tensile modulus, yield strength and impact resistance of the blends conform to an additive blend properties. Blends show good chemicalresistance properties. Viscosity ratio of PC to PET was about 4 to 6, suggesting ease at PC/PET processing in manufacturing process.