Abstract
Morphology and Theological properties of biaxially oriented films and extradates of the blends of polycarbonate (PC) with polypropylene (PP) homopolymer and PP copolymers prepared by twin screw extrusion and lab-stretcher have been investigated by scanning electron microscopy and rheometrics mechanical spectrometer (RMS), respectively. Two different kinds of PP copolymers were used: (i) ethylene-propylene (EP) random copolymer; (ii) ethylene-propylene-butylene (EPB) terpolymer. The haze of biaxially oriented films of various PC-PP blends increases with increasing PC concentration. In the study of morphology of the blends of PC with PP or PP copolymers, phase separation between the PC-rich phase and the PP-rich phase is observed for all the blend systems. Also, it appears that the phase separation between the PC-rich phase and the PP-rich phase is more pronounced in the PC-rich compositions than in the PP-rich compositions of the PC-PP blends. In the RMS study of the PC-PP blends, the storage moduli of the PC-PP blends at low frequencies have larger value than those of the simple mixing rules. This result can be seen in the immiscible blend systems, and the increase of storage moduli in the PP-rich compositions and PC-rich compositions is consistent with the calculated result by using an emulsion model of dispersed blends.
| Original language | English |
|---|---|
| Pages (from-to) | 55-63 |
| Number of pages | 9 |
| Journal | Polymer (Korea) |
| Volume | 21 |
| Issue number | 1 |
| Publication status | Published - 1996 |
Keywords
- Blend
- Emulsion model
- Morphology
- Polycarbonate
- Polypropylene
ASJC Scopus subject areas
- Chemical Engineering(all)
- Polymers and Plastics
- Materials Chemistry