SYNTHESIS AND PROPERTIES OF POLYIMIDES DERIVED FROM 2,2-BIS[4-[2-(4-AMINOPHENOXY)ETHOXY]PHENYL]PROPANE

Add time:09/01/2019    Source:sciencedirect.com

A diamine-containing oxyethylene unit, 2,2-bis[4-[2-(4-aminophenoxy)ethoxy]phenyl]propane (BAEPP), was used as a monomer with various aromatic tetracarboxylic dianhydrides to synthesize polyimides via a conventional two-step procedure. The diamine was prepared through the nucleophilic displacement of [2,2-bis(4-β-hydroxyethoxy)phenyl]propane with p-chloronitrobenzene in the presence of K2CO3, followed by catalytic reduction. Depending on the dianhydrides used, the poly(amic acid)s obtained had inherent viscosities of 0.97–1.57 dL g−1. All the poly(amic acid)s could be cast from the DMAc solutions and thermally converted into transparent polyimide films. The polyimide films had a tensile strength range of 57–97 MPa, an elongation range at break of 3–7%. The polyimides derived from 4,4′-sulfonyldiphthalic anhydride and 4,4′-hexafluoro-isopropylidenediphathalic anhydride exhibited excellent solubility in organic solvents. These polyimides had glass transition temperatures between 252 and 314°C, and 10% mass loss temperatures were recorded in the range of 466–479°C in nitrogen. © 1997 Elsevier Science Ltd

We also recommend Trading Suppliers and Manufacturers of 4-(4-ETHOXY-PHENYL)-5-PYRIDIN-3-YL-4H-[1,2,4]TRIAZOLE-3-THIOL (cas 111114-78-4). Pls Click Website Link as below: cas 111114-78-4 suppliers

Prev:Original articleSynthesis and antimicrobial studies of a new series of 2-{4-[2-(5-ethylpyridin-2-yl)ethoxy]phenyl}-5-substituted-1,3,4-oxadiazoles
Next:Data articleSynthesis, characterization and crystal structure of 4-[(6-ethoxy benzothiazol-2-yl) diazenyl] phenyl 2-(2, 3-dihydro-1H-inden-2-yl) acetate)