Abstract
The microstructure of bisphenol A polycarbonate (PC) and poly (ethylene terephthalate) (PET) was studied by Fourier transform infrared microspectroscopy. The spectra of the carbonyl stretching bands for PC/PET blends showed two peaks which correspond to those of the respective polymer components, and no other peaks were found in the region due to aromatic esters and aromatic aliphatic carbonates. This result means that the transesterification of PC/PET blends did not take place. The peak intensity ratios, IPC/IPET, of the carbonyl stretching bands changed depending on the depth. It was also found in a surface region that the position of absorption bands of the carbonyl group in PET varied remarkably in the range of about 20% to 50% of the PET weight fraction. These results suggested that the domain structure changed depending on the composition, and the domain size of phase separation is smaller in a surface region than in a bulk region of PC/PET blends.
