Characteristics and properties of polyimide/vanadium oxide hybrid membranes

Abstract

A series of polyimide/vanadium pentoxide (PI/V 2 O 5 ) hybrid film has been successfully fabricated through the in situ formation of V 2 O 5 within a polymer matrix by sol-gel process. The polyamic acid (PAA) is prepared from 4,4 0 -diaminodiphenyl ether (ODA) and 3,3 0 ,4,4 0 -benzophenonetetracarboxylic anhydride (BTDA) in N-methylpyrrolidinone (NMP) solvent. Then different amounts of Bis-(2,4-pentanedionato) vanadium oxide are incorporated into polyamic acid (PAA) matrix, respectively and then thermally imidized to form PI/V 2 O 5 hybrid membranes. The imidization temperature and time are optimized by FTIR measurements through the observation of V 2 O 5 absorption peak. The influence of V 2 O 5 content on the thermal stability, morphology and mechanical properties of PI/V 2 O 5 hybrid films are studied.

Photodynamic Therapy Excited by Cerenkov Radiation from Cesium-137 Irradiator: In Vitro Studies

“…Photocolorimetric determination of cytotoxicity was assessed using CCK-8 dye (Dojindo Laboratories, Tokyo, Japan) to evaluate cell viability [20,21]. After PDT experiments, cells were incubated in the dark for 24 hours and then were washed with PBS buffer.…”

Preparation SnO2 Nanolayer on Flexible Polyimide Substrates via Direct Ion-Exchange and in situ Oxidation Process

“…A typical preparation involves dissolving of metal salts or complex in polymeric precursor solution and decomposition to corresponding metal oxides while thermal curing the films. 19,[24][25][26][27][28][29][30] However, this method suffers from the drawback that metal complex would remained in the polymeric substrates during the whole procedures, which leads to a degradation of the polymeric matrix. 24,25 Thus, metal oxide precursors containing strong acids groups, such as Cl -, SO 4 2and NO 3 -, should be avoided, and the moderate organic acid groups with appropriate concentration should be used.…”

“…An alternative method for preparing uniformly distributed metal oxide nanaoparticles in polymeric substrates is to synthesize metal oxide materials in situ while preparing the polymeric substrates. A typical preparation involves dissolving of metal salts or complex in polymeric precursor solution and decomposition to corresponding metal oxides while thermal curing the films. ,− However, this method suffers from the drawback that metal complex would remained in the polymeric substrates during the whole procedures, which leads to a degradation of the polymeric matrix. , Thus, metal oxide precursors containing strong acids groups, such as Cl − , SO 4 2− and NO 3 − , should be avoided, and the moderate organic acid groups with appropriate concentration should be used. In the 1990s, Taylor and co-workers reported that the prepared PI/Fe 2 O 3 film, through dissolving of iron(III) acetylacetonate in poly(amic acid) (PAA) N , N -dimethylacetamide (DMAc) solution, was found very brittle after thermal treatment when the concentration of metal ions was more than 4 wt % …”