“…The T g values may differ from one another depending on measuring techniques and testing mechanisms. However, a single T g may indicate the miscibility of the system at the molecular level [14,15,17,[20][21][22][23]. Table 1 tabulates the T g measured by DSC, TMA and DMA, and shows all of the thermal techniques yield single intermediate glass transition for the blends, which confirm a sign of miscibility between PBI and Matrimid at the molecular level.…”