High performance polymer blends

Enhanced Matrimid membranes for pervaporation by homogenous blends with polybenzimidazole (PBI)

“…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.…”

“…It may imply non-fully miscibility of these two polymers when PBI concentration is higher than 10 wt.% [31]. It is known that the carbonyl group of Matrimid and the N H group of PBI has a strong tendency to form hydrogen bond and the miscibility of these two polymer blends is mostly attributed to this interaction [14,17,[20][21][22][23]. To verify the existence of specific interaction between these two polymers, an attenuated total reflection (FTIR-ATR) was con- ducted to characterize the composition dependent band shift.…”

“…This is due to the fact that PBI is a high T g glassy polymer that possesses both donor and acceptor hydrogen-bonding sites [12,13], which are capable of participating in specific interactions [14,15]. In addition, PBI has outstanding thermal stability and chemical resistance.…”

Cross-linked polyimides containing phenolic residue

“…Mostly polyimides are infusible, insoluble and thermally stable polymers. Due to these properties they are difficult to processable [1][2][3]. So ''in situ'' polymerization techniques are adopted for fabrication [1][2][3][4].…”

“…Polyimides are known as high performance polymers and find many applications from microelctronics to aerospace [1][2][3]. Mostly polyimides are infusible, insoluble and thermally stable polymers.…”