FTIR Spectroscopic Studies of Miscible Polymer Blends

Abstract

Abstract The miscibility of IR and V-BRs with various vinyl contents has been investigated by using DSC and temperature-dependent FTIR spectroscopy, from which we conclude: 1. The glass-transition temperatures of the sequences which relate to the microstructures in IR and V-BRs can be detected by using temperature-dependent FTIR spectroscopy. 2. A miscible polymer blend exhibits a single Tg in DSC thermograms. But, judging from the infrared spectroscopic probe, the IR segments and the V-BR segments do not begin to move at the same temperature. When the data of infrared spectroscopy are compared with those of DSC, it would be possible to conclude that Tg− corresponds to the onset of the segmental movement of IR and then V-BR segments begin to move next, resulting in the broadening of the DSC transition region. 3. This broadening of the DSC transition region originates from the disparity of Tgs between IR and V-BR and may not be necessarily related to the onset of phase separation.