Add time:07/17/2019         Source:sciencedirect.com

A new series of thermoplastic polyimides derived from 2,2-dimethyl-1,3-bis(4-aminophenoxy)propane (MD) and a new diamine 2-methyl-2-propyl-1,3-bis(4-aminophenoxy)propane (MPPD) have been prepared and characterized. These materials were selected on the basis of their potential to serve as low-cost matrix resins able to perform at 170°C. They were synthesized from reasily available aromatic dianhydrides such as 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and the above diamines. The glass transition temperature (Tg) and crystalline melt temperature (Tm) of these polymers containing flexible alkylene-dioxy units varied from 200 to 230°C and from 300 to 375°C, respectively. Polymers decomposed in air between 435 and 455°C as witnessed by thermogravimetric analysis. Work was focused on the polymer prepared from 4,4′-oxyphthalic anhydride (ODPA) and MPPD, which had a Tg of 200°C and could be readily melt processed below 305°C.

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