Thin film encapsulation of nano composites of polycarbonate (PC) for thermal management systems

Abstract

The configuration of thin film polycarbonate (PC) is formulated, aiming for a financially efficient approach of the solvent casting method by grafting waste fly ash cenosphere (FAC) encapsulated with tetraethoxysilane (TEOS) as a grafting agent. The research study emphasized on the routine practice of controlled thermal dissipative electronic widgets by a systematic characterization analysis. FTIR exemplifies the surface adherence characteristics of the GFAC (Grafted Fly Ash Cenosphere) over PC, by confirming the efficient grafting between silane and FAC at 2950 cm À1 due to the flexible vibrations by the -OH group. The PC-FAC composite showed the characteristic triplet signature peaks of PC at 1152, 1188 and 1227 cm À1 .Following the hierarchy, the morphological study analyzes the surface molecular interaction between the PC/GFAC and their electronic properties by FESEM. AFM confers the topographical study of pristine PC, which measures the surface roughness of pristine PC as 4.5 nm which mitigates to 0.7 nm for the PC/GFAC and justifies the homogenous dispersion of GFAC in PC, thus directing the consequential study of TGA. It examines controlled surface thermal conduction and authenticates the noble thermal stability of the PC/GFAC with a char yield of 36% (approximately more than twice that of pristine PC) at 800 C by TGA. The PC/GFAC affirms a 70 C lag in the onset of thermal degradation, at 430 C, as compared with pristine PC, which starts to decompose at 360 C. Thus, the silane grafted nano composites of PC expands the operable temperature range for the electronic elemental properties usage. The present investigation procures attention on the thermal characteristics of the PC/GFAC, illustrated by the conduction modeling parameter across the spherical wall of the cenosphere and the interfacial heat transfer for the PC/GFAC composite, pertaining to a worthwhile and serviceable thermal management praxis.

Direct Creation of Highly Conductive Laser‐Induced Graphene Nanocomposites from Polymer Blends

“…We were unable to find visual signs of PC graphitization or carbonization on the surface of the PC‐LIG nanocomposite with the either low (PC10‐LIG) or high (PC90‐LIG) PC content, as shown in Figure i,j, respectively. Unlike PEI and PI with higher absorbance at 10.6 µm laser wavelength (≈0.5 41 and ≈0.55, respectively), PC has much smaller laser absorbance (≈0.1), thus faster heating can be achieved in PEI and PI than in PC, favoring the photophysical conversion to graphene. Hence, the penetration depth for graphene 3D‐structure formation depends on the exposure time and the laser power.…”

Sensitization of LnIII (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

“…The TGA curves for both polymers show an initial weight loss at 100 °C due to evaporation of water and/or loss of small organic groups (Figure ). Pyrolysis of the derivatives begins at 200 °C, seen by the loss of the bulk weight that can be attributed to the cleavage of carbonate groups, while residual chars of the derivatives remain at 350 °C . Compared to pure PEG, the polymers are less thermostable as pyrolysis of the former does not begin until after 300 °C (Figure ).…”

“…The C-O stretching vibrations are at 1266 and 1256 cm -1 for BDP and BEP, respectively, as shown in Figure 1, in analogy to what is seen for other PCs. [14,31] The absence of the pyridyl and lactone C=O stretches in the FTIR spectrum of the PEG indicates successful synthesis of the PC-based materials (Figure 1).…”

“…Pyrolysis of the derivatives begins at 200°C, seen by the loss of the bulk weight that can be attributed to the cleavage of carbonate groups, while residual chars of the derivatives remain at 350°C. [31] Compared to pure PEG, the polymers are less thermostable as pyrolysis of the former does not begin until after 300°C (Figure 3). The T g values of the polymers are -32°C for BEP and -13°C for BDP, as determined from DSC measurements (Figure 4a-b), and are comparable to values reported for PCs derived from cyclic carbonates.…”

Multiwalled carbon nanotube promotes crystallisation while preserving co-continuous phase morphology of polycarbonate/polypropylene blend

“…9, the characteristic absorption peaks of PC at 1004 cm À1 and 1189 cm À1 , correspond to the C-O stretching vibrations, and 1501 cm À1 , correspond to the C¼ C stretching vibration. The peak at 1780 cm À1 is attributed to the C¼O stretching vibration and peak at 2972 cm À1 corresponds to the eCHstretching vibration [28]. After a detailed analysis of the IR spectra for these blends and nanocomposites, it has been noticed that there is no shift in the peaks of functional groups in the PC/PP blend and nanocomposites spectra.…”