Comparison of Properties of Colorless and Transparent Polyimide Nanocomposites Containing Chemically Modified Nanofillers: Functionalized-Graphene and Organoclay

Abstract

Poly(amic acid) (PAA) was synthesized from dianhydride 4,4-(4,4-isopropylidenediphenoxy)bis(phthalic anhydride) and diamine bis [4-(3-aminophenoxy) phenyl] sulfone. Colorless and transparent polyimide (CPI) hybrid films were synthesized through thermal imidization after dispersing nanofillers using an intercalation method in a PAA solution. C16-GS and C16-MMT, in which hexadecylamine (C16) was substituted on graphene sheet (GS) and montmorillonite (MMT), respectively, were used as nanofillers to reinforce the CPI hybrid films. These two nanofillers were admixed in varying loadings of 0.25 to 1.00 wt%, and the morphology, thermal properties, and optical transparency of the hybrid films were investigated and compared. The results suggest that the thermal properties of the CPI hybrid films can be improved by adding only a small amount of nanofiller. Transmission electron microscopy results of the CPI hybrid film containing two types of fillers suggested that the fillers were well dispersed in the nano-size in the matrix polymer; however, some of the fillers were observed as agglomerated particles above the critical concentration of 0.50 wt%.

Polyimide Layers with High Refractivity and Surface Wettability Adapted for Lowering Optical Losses in Solar Cells

“…The prepared polymers exhibited good transparency in the visible range, namely at 550 nm, the transmittance was 82.71% for PI-1, 68.58% for PI-2, 70.71% for PI-3, and 80.26% for PI-4. The results are similar to the transparency reported for other PIs containing BAPS moieties [ 31 , 32 ]. Among the analyzed PI films, it can be noted that a higher amount of incident radiation comes out of the other side of PI-1 and PI-4 samples, particularly under 600 nm.…”

Effect of organoclay on the physical properties of colorless and transparent copoly(amide imide) nanocomposites

“…That is, when the STN content was increased from 3 to 7 wt%, T g decreased from 233 to 213 °C, possibly because when the clay added to the hybrid lm exceeds a certain critical concentration, it is not dispersed; instead, it aggregates, reducing T g . 46,47 The aggregation of clay when the critical concentration is exceeded is supported by the XRD and TEM results (Fig. 3 and 5).…”

Multifunctional Polyimides for Resistive Switching Memory Devices Based on Flexible Transparent Polyimide--AgNWs Hybrid Electrodes

“…[14][15][16] Polymer memory materials can store data through the conversion between the low and high current states between two electrodes by the applied voltage, which can be assigned as "0" and "1" or "OFF" state and "ON" state. [17][18][19][20][21] In recent years, functional polyimides (PIs) are regarded as the most promising polymeric memory materials due to their excellent thermal resistance [22] , chemical stability [23] , mechanical durability [24] and flexibility [25] . More importantly, PIs with the special donor-acceptor (D-A) type molecular structures exhibiting stronger intramolecular and intermolecular charge transfer (CT) effects are more promising for the flexible memory devices.…”