Thermal modelling of hybrid composites of nano cenosphere and polycarbonate for a thermal protection system

Katiyar, Neha; Kandasubramanian, Balasubramanian

doi:10.1039/c4ra07973f

Cited by 20 publications

(18 citation statements)

References 38 publications

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“…The obtained result reveals that the initiation of thermal decomposition and temperature at maximum decomposition was eloquently improved in nano Ph-PC/POSS polymer nanocomposite by the formation of silicon containing heat shield layer a high temperature. In this framework, the suppressed mass loss was imputed by uncovering of the entrapped nano asperities of POSS by the complete mass loss of PC matrix followed by conversion of POSS in silicates after degradation 47 48 49 50 . The suppressed mass loss can also be ascertained by the ordered distribution of POSS in PC lamellae space which yielded shielding effect until the external temperature is high enough to the melting point of the polymer matrix which further concluded by the calculation of latent heat of fusion.…”

Section: Resultsmentioning

confidence: 99%

Temperature Assisted in-Situ Small Angle X-ray Scattering Analysis of Ph-POSS/PC Polymer Nanocomposite

Yadav

Naebe

Wang

et al. 2016

Sci Rep

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Inorganic/organic nanofillers have been extensively exploited to impart thermal stability to polymer nanocomposite via various strategies that can endure structural changes when exposed a wide range of thermal environment during their application. In this abstraction, we have utilized temperature assisted in-situ small angle X-ray scattering (SAXS) to examine the structural orientation distribution of inorganic/organic nanofiller octa phenyl substituted polyhedral oligomeric silsesquioxane (Ph-POSS) in Polycarbonate (PC) matrix from ambient temperature to 180 °C. A constant interval of 30 °C with the heating rate of 3 °C/min was utilized to guise the temperature below and above the glass transition temperature of PC followed by thermal gravimetric, HRTEM, FESEM and hydrophobic analysis at ambient temperature. The HRTEM images of Ph-POSS nano unit demonstrated hyperrectangular structure, while FESEM image of the developed nano composite rendered separated phase containing flocculated and overlapped stacking of POSS units in the PC matrix. The phase separation in polymer nanocomposite was further substantiated by thermodynamic interaction parameter (χ) and mixing energy (Emix) gleaned via Accelrys Materials studio. The SAXS spectra has demonstrated duplex peak at higher scattering vector region, postulated as a primary and secondary segregated POSS domain and followed by abundance of secondary peak with temperature augmentation.

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Section: Resultsmentioning

confidence: 99%

Temperature Assisted in-Situ Small Angle X-ray Scattering Analysis of Ph-POSS/PC Polymer Nanocomposite

Yadav

Naebe

Wang

et al. 2016

Sci Rep

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“…Fig. 6,16 The peak at 2943 cm À1 of pristine PC belongs to the asymmetric stretching vibration, which moves to 2925 cm À1 in the thin lm PC/n-HA composite. 15 The characteristic peak at 1772 cm À1 is due to the carbonyl C]O stretch, and the strongest infrared absorptions in PC are due to the C-O single bond stretches that continue down to 1000 cm À1 , with the strongest of these at 1016 cm À1 .…”

Section: Ir Analysismentioning

confidence: 99%

“…For example, typical fabrication using metals, such as stainless steel (SS), titanium alloy, and cobaltchromium alloys, are expedient for conventional knee and hip implants. 6 A few studies have been reported on the subsequent weakening in mechanical properties of chitosan/HA biocomposites comprising nano-sized HA particles. 1 Nano-hydroxyapatite (n-HA) is a well scrutinized biocompatible inorganic mineral that exemplies intrinsic bone mimicking characteristics for encouraging osteo-development.…”

Section: Introductionmentioning

confidence: 99%

Nanotexturing of PC/n-HA nanocomposites by innovative and advanced spray system

Banerjee

Balasubramanian

2015

RSC Adv.

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Nanoscale texturing of a nano-hydroxyapatite (n-HA) filler on a polycarbonate (PC) matrix is ameliorated by advanced engineered spray techniques viz. spray gun and centrifuged spray drying, concerned with modifying topographical properties for biomedical grade screw/plate coating application. Mathematical evaluation of the factors affecting the texture of the thin film PC/n-HA nanocomposite has been modelled for the centrifuged spray dryer concerning homogeneity and symmetric dispersion of n-HA pitching on the PC medium. FTIR illustrates the functional group vibration peaks of 1093 cm À1 and 603 cm À1 of PC/n-HA nanocomposites due to the presence of PO 4 3À . XRD infers the average crystal size of n-HA #20 nm in the PC/n-HA nanocomposite, which possesses consistency in the FESEM micrograph, confirming the various dispersion comparisons between spray gun film and centrifuged spray dried film. Topographical analysis of PC/n-HA film acquired by the two modes of spraying exemplifies surface roughness of 81.4 nm by the spray gun and 132 nm by the centrifuged spray dryer technique, with increasing spikes affirming the uniform scaffold structure of the n-HA embedment over the PC medium, thus, providing the hydrophobic trait needed for corrosion resistant application. Contact angle analysis shows the wettability and adhesive property of the PC/n-HA nanocomposite and delivers a 131.7 contact angle for innovative centrifuged spray dryer technique. Hence, the modelled parameters emphasize the applicability of the innovative designed centrifuged spray dryer technique for biomedical coating applications.Fig. 6 Topographical analysis of PC/n-HA (a) spray gun dried film. (b) Centrifuged spray dried film. (c) Cross-sectional view of n-HA filler over PC matrix.This journal is

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“…30 Restriction of the mobility of the polymer chains by oxide particles present in the FAC also contributes to the improvement which was observed in the thermal stability. 30 Restriction of the mobility of the polymer chains by oxide particles present in the FAC also contributes to the improvement which was observed in the thermal stability.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

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

2014

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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.

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Thermal modelling of hybrid composites of nano cenosphere and polycarbonate for a thermal protection system

Abstract: The article explores high temperature applications of novel polycarbonate cenosphere composites for potential use in thermal protection systems.

Cited by 20 publications

References 38 publications

Temperature Assisted in-Situ Small Angle X-ray Scattering Analysis of Ph-POSS/PC Polymer Nanocomposite

Temperature Assisted in-Situ Small Angle X-ray Scattering Analysis of Ph-POSS/PC Polymer Nanocomposite

Nanotexturing of PC/n-HA nanocomposites by innovative and advanced spray system

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

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