|
چکیده
|
Aromatic polyimides (PIs) generally possess excellent thermal, mechanical, electrical and chemical properties (1). Therefore, they have been used in many applications such as electronics, coatings and adhesives, composite materials and membranes. However, these polymers are difficult to process because of their high glass transition temperatures (Tg) and their limited solubility in organic solvents (2). The objective of this study was the preparation of novel fluorescent diamines material based on xanthene pendant. Scheme 1 shows the synthesis of these new diamines compound. Polyimides have been prepared from new diamines and aromatic dianhydrides by a two-step chemical imidization method that gives functionality to the side chains of the polymer and an ether linkage in the main chain that imparts flexibility to macromolecules. The presence of high-volume pendant groups is expected to result in a less-ordered structure, enhancing the solubility while maintaining good thermal stability. The aim of this study was to investigate the physical properties of these PIs, including their viscosity, solubility, thermal stability and their unique spectroscopic properties such as ultraviolet-visible absorption, photoluminescence and antibacterial activity. The Polyimids showed good solubility with high thermal stability and good antibacterial activity
|