The key process-InGaP etching,polymide planarization process,and air-bridge for fabrication of self-aligned InGaP/GaAs HBT devices and circuits are studied.

A Series sulfonated polyimides (SPI) for fuel cells were synthesized via direct polymerization with a sulfonated aromatic diamine (S-ODA), a non-sulfonated diamine (ODA) and 3, 3′, 4, 4′-benzophenoneteracarboxylic dianhydride(BTDA), and then characterized by FT-IR.

A series of new six-member sulfonated polyimides(SPI-X) containing benzoxazole moieties were prepared by one-step high temperature polymerization method.

To prepare polymer electrolyte membranes for direct methanol fuel cell(DMFC), a series of novel sulfonated polyimides(SPI) were synthesized from sulfonated diamine,2,5-bis(4-aminophenoxy)benzene sulfonic acid (S-TBDA) with 3,3′,4,4′- benzophenone tetracarboxylic dianhydride (BTDA) and non-sulfonated diamine(ODA) via direct polymerization in this study.

Investigation on the preparation and properties of fluorinated polyimide for waveguide;

In order heighten the molecular weight of fluorinated polyimide, the process of synthesis were optimized through modified molecular ratio of dianhydride and diamine, the order of adding reactant, reaction temperature, solvents.

Sulfonated poly(ether imide) (SPEI) and poly(ether sulfone) (PES) blend membranes for application in the direct methanol fuel cells (DMFC) were successfully prepared by solution blend technique.

The successful synthesis of the aromatic triamine containing pyridine ring laid an important foundation for preparation of a novel hyperbranched polyimide.