Design of low dielectric constant polybenzoxazine nanocomposite using mesoporous mullite

Ilango, Kishore Kowtham; Prabunathan, P.; Satheeshkumar, E.; Manohar, P.

doi:10.1177/0954008316632289

Cited by 8 publications

(6 citation statements)

References 40 publications

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“…During the thermal curing of monomer resin (BA‐a), the FCM concurrently reinforced with the organic matrix and formed a high temperature retardant alumino silicate intercalated organic–inorganic hybrid network through bonding. This resulted in increase in the interfacial interaction and compatibility between the matrix (PBZ) and reinforcement FCM . The neat PBZ, 0.5, 1.0, and 1.5 wt% FCM reinforced PBZ nanocomposites possess the char yield value of 24%, 26%, 27%, and 29% at 750°C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Ceria doped mullite reinforced polybenzoxazine nanocomposites with improved UV‐shielding and thermo‐mechanical properties

et al. 2016

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In this present work, the UV shielding behavior of various mol percent of Ce doped mullite samples (CM0–5) were studied. The UV shielding behavior of mullite increasing with respect to ceria and reaching 78% of shielding tendency at 300 nm for CM5 was one of the fascinating outcomes of the study. Based on its exhibition of high shielding tendency, CM5 was chosen and functionalized with Glycidyl terminated silane. Subsequently, the resultant functionalized ceria doped mullite (FCM) was reinforced with polybenzoxazine (PBZ) matrix in order to build up FCM/PBZ nanocomposites. A detailed study was also conducted on the level of influence FCM yields in impacting properties such as UV shielding and thermo‐mechanical nature of FCM/PBZ nanocomposites. Upon analysis, it was determined that the 1.5 wt% FCM reinforced PBZ nanocomposite delivered 89% and 78% shielding efficiency at 300 and 200 nm UV region, respectively. Furthermore studies indicated that it exhibited 34% improved char yield, enhanced tensile strength, that is, 24.81% and 162°C as its glass transition temperature in comparison with neat PBZ matrix and other FCM/PBZ nanocomposites. These results suggest that the Ce doped mullite with high UV shielding properties can be used as a reinforcement to increase the UV shielding tendency of polymeric material which is of industrial significance. POLYM. COMPOS., 39:2073–2080, 2018. © 2016 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Ceria doped mullite reinforced polybenzoxazine nanocomposites with improved UV‐shielding and thermo‐mechanical properties

et al. 2016

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“…The raw materials used in this stud from Zouza member in far north terials were all recognized as ri dielectric permittivity and electrical conductivity are ultralow in the mullite ceramic. 21 Carbon fibers are usually added into the porous mullite ceramic on account of the excellent electrical conductivity, low mass density, high thermal stability, and superior conductive loss in carbon fibers. 22 Dielectric responses of porous carbon fiber/mullite composites can be tailored through tuning the fiber volume concentration and AC frequency in X-band.…”

Section: Raw Materialsmentioning

confidence: 99%

“…As a typical example of ceramic, mullite ceramic (

3 {Al}_{2} {normalO}_{3} \cdot 2 {SiO}_{2}

) is a prior candidate for application in the complex high‐temperature environment due to excellent thermal stability, lightweight, high strength and good corrosion resistance in the extreme environment 19,20 . However, the dielectric permittivity and electrical conductivity are ultra‐low in the mullite ceramic 21 . Carbon fibers are usually added into the porous mullite ceramic on account of the excellent electrical conductivity, low mass density, high thermal stability, and superior conductive loss in carbon fibers 22 .…”

Section: Introductionmentioning

confidence: 99%

Multi‐scale modeling for frequency‐dependent dielectric responses of non‐uniform porous carbon fiber/mullite composites

Xia

Zhao

Long

et al. 2021

Int J Applied Ceramic Tech

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The frequency-dependent dielectric responses of non-uniformly dispersed porous carbon fiber/mullite composites fabricated by gel-casting are intensively investigated in the X-band range. Experimental data have shown the frequency dependence of dielectric permittivity and electrical conductivity of the overall composite. The dielectric responses of non-uniformly dispersed porous carbon fiber/mullite composites in X-band are quantitatively modeled through a multi-scale homogenization method based on the effective-medium approximation. The non-uniform dispersion of carbon fibers and micro-pores in the mullite ceramic has been included via a corresponding multi-scale geometric setting. The effective dielectric permittivity and electrical conductivity of the composite both enhance with the fiber volume concentration. It is demonstrated that the decreasing dielectric permittivity and increasing electrical conductivity with respect to the AC frequency can be attributed to frequency-dependent dielectric relaxation and electron hopping effects at the interface. Furthermore, improving the uniform dispersion of carbon fibers in the mullite is essential to achieve the enhanced dielectric response of porous carbon fiber/mullite composites. The present paper can provide the directions to design the porous carbon fiber/mullite composites for micro-electronic devices in the high-temperature environment. K E Y W O R D Sdielectric response, multi-scale, non-uniform dispersion, porous carbon fiber/mullite composite, X-band How to cite this article: Xia X, Zhao S, Long L, Li Y, Zhou W. Multi-scale modeling for frequency-dependent dielectric responses of non-uniform porous carbon fiber/ mullite composites.

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“…As a novel class of phenolic thermosetting resins, polybenzoxazine (PB) has been attracting both scientific and industrial attentions during the past decade, 1 mostly due to its desirable thermal stability, 2 low water absorption, 3 excellent dielectric properties 4 and facile production in a solvent-less procedure. 5 These remarkable properties make PB a real candidate for use in smart materials and coatings mainly in aerospace engineering, integrated electronics and the like.…”

Section: Introductionmentioning

confidence: 99%

An insight into thermal stability and decomposition kinetics of polybenzoxazine plasma treated graphene nanocomposites

Karbalaei-Bagher

Ahmadi

Nazockdast

2021

Polymers and Polymer Composites

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This research was targeted to investigate the effect of oxygen plasma treated graphene nanosheets (tGNSs) on the thermal stability of benzoxazine resin and to have a further and deeper mechanistic understanding of thermal decomposition kinetics of such nanocomposites in 0.5, 1 and 3 wt% of tGNS. The samples were prepared as reported in our previous study. The quality of dispersion of tGNSs within benzoxazine was investigated by X-Ray diffraction (XRD) and scanning electron microscopy (SEM) technique. Also, to ensure the complete curing of samples the differential scanning calorimetry (DSC) analysis was performed. Using thermogravimetric analysis (TGA), it was found that the addition of tGNS improved the char yield and thermal stability parameter of benzoxazine nanocomposites and this improvement was more prominent at 1% and higher amount of nanoparticles. Moreover, the first stage of thermal degradation kinetic of benzoxazine was disappeared above 1 wt% of tGNS. The samples were kinetically analyzed through Kissinger, Flynn-Wall-Ozawa and Friedman and Coats-Redfern method. It was revealed that the overall activation energy was enhanced from 168 to 224 kJ mol−1 and 275 to 420 kJ mol−1 for the second and third stage of degradation using 1 and 3 wt% of tGNS.

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Design of low dielectric constant polybenzoxazine nanocomposite using mesoporous mullite

Cited by 8 publications

References 40 publications

Ceria doped mullite reinforced polybenzoxazine nanocomposites with improved UV‐shielding and thermo‐mechanical properties

Ceria doped mullite reinforced polybenzoxazine nanocomposites with improved UV‐shielding and thermo‐mechanical properties

Multi‐scale modeling for frequency‐dependent dielectric responses of non‐uniform porous carbon fiber/mullite composites

An insight into thermal stability and decomposition kinetics of polybenzoxazine plasma treated graphene nanocomposites

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