Synthesis and characterization of bisphenol-A ether diamine-based polyimide POSS nanocomposites for low K dielectric and flame-retardant applications

Abstract

Polyhedral oligomeric silsesquioxane (POSS) -polyimide (PI) hybrid nanocomposites were prepared by a two-step approach, bisphenol-A ether diamine (BAED) and pyromelletic dianhydride (PMDA) in 1-methyl-2-pyrrolidone (NMP) were used to prepare polyamic acid (PAA) to which varying weight percentages of OAPS in NMP were added. During the second step, the polycondensation was effected by thermal imidization. The formation of hybrid nanocomposites was confirmed by using FTIR spectra. The thermal properties of POSS-PI nanocomposites were studied using differential scanning calorimetry and thermogravimetric analysis. The lowest dielectric constant 2.68 was achieved for 15 wt.% POSS-PI material when compared with the value of 3.34 for the neat PI. Data from thermal studies indicate that the incorporation of POSS into polyimide significantly enhanced the glass transition temperature (T g ), thermal stability, char yield and flame-retardant properties of hybrid nanocomposites than that of neat PI. The excellent combination of both dielectric and thermal properties of the material developed in the present study will find application in microelectronics.

Segmental dynamics in hybrid polymer/POSS nanomaterials

“…The coefficient of thermal expansion was also decreased, while mechanical moduli and thermostability were also improved. The same POSS moiety was utilized later to crosslink pyromellitic anhydride -based PIs, with ether-linked cyclohexyl diamine [158] or bisphenol-A ether diamine [159], as well as a system prepared by BPTA and bis(4-amino-3,5-dimethylphenyl)-3-quinolylmethane [160]. It is confirmed that aminophenyl POSS is well dispersed in the matrices, improving mechanical properties and increasing T g .…”

Bio‐based benzoxazines based on sesamol: Synthesis and properties

“…Limiting oxygen indexes (LOI), which can indicate the flame retardancy of polybenzoxazine resins, were obtained from the char yield (CY) by Van Krevelen's equation (LOI = 17.5 + 0.4 * (CY)) . Normally, polymers with LOI values greater than 26 are considered to have self‐extinguishing properties.…”

Low dielectric constant polyimide mixtures fabricated by polyimide matrix and polyimide microsphere fillers

“…There were various fillers, e.g. nanoscale graphene fluoroxide, graphene oxide, graphite‐like carbon nitride, KIT‐6, polyhedral oligomeric silsesquioxane, amino functionalized polyhedral oligomeric silsesquioxane, ladder‐poly(propylsilsesquioxane), nanosized silica, SBA‐15, pure silica zeolite nanocrystals and graphene oxide blended with octa(aminophenyl) silsesquioxane,…”