Synthesis and characterization of epoxy modified cyanate ester POSS nanocomposites

Abstract

Polyhedral oligomeric silsesquioxane (POSS) viz; namely, Octa functional silsesquioxanes [octa amino (OAPS) and octa glycidyl (OG)] reinforced epoxy modified cyanate ester nanocomposites were prepared through intercrosslinked network. The intercrosslinking formation between cyanate ester and POSS was confirmed by Fourier transform infrared spectroscopy. The morphology of nanocomposites was studied using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and atomic force microscopy techniques. The electrical properties of the nanocomposites were evaluated by impedance analyzer. The influences of POSS macromer on the thermal and mechanical properties of epoxy modified cyanate ester nanocomposites were also addressed. The thermogravimetric analysis indicates that the thermal stability of the nanocomposites increases with increasing percentage of both types of POSS macromer. The dielectric constant and dielectric loss are decreased with increasing POSS concentration in the epoxy modified cyanate ester nanocomposites.

Development of Prosopis juliflora carbon-reinforced PET bottle waste-based epoxy-blended bio-phenolic benzoxazine composites for advanced applications

“…34 The absorption peak appearing at 1260 cm À1 is due to C-O stretching vibrations, and the broad absorption band observed at 3383 cm À1 was assigned to the -OH stretching vibrations produced during the curing process. 35 In addition, the absorption peak appearing at 1104 cm À1 corresponds to symmetric C-O-C stretching, which is due to the ether linkages present in the PETEP-CBz matrix and f-PJC/PETEP-CBz composites. 36 It was ascertained that the FT-IR studies conrm the formation of the PETEP-CBz matrix and varying weight percentages of f-PJC-reinforced PETEP-CBz composites.…”

Silicon-containing trifunctional and tetrafunctional cyanate esters: Synthesis, cure kinetics, and network properties

“…A strategy used to provide thermooxidative protection in cyanurate polymer networks that has been explored through much recent investigation is the incorporation of silicon or siloxy moieties in the form of monomers and cocuratives, blends and modifiers, silica nanoparticles, clay nanoplatelets, or other silicon‐containing nanostructures including oligomeric silsesquioxanes . While the addition of silicon in fully oxidized form (i.e., as SiO 2 ) can provide an in‐place barrier to oxygen permeation, the use of unoxidized organosilicon moieties or partly oxidized silicates allows for the in situ generation of a protective barrier during high‐temperature oxidation or exposure to energetic forms of oxygen (such as atomic oxygen in low Earth orbit) .…”

Toughening of POSS–MPS composites with low dielectric constant prepared with structure controllable micro/mesoporous nanoparticles

“…[1][2][3] However, the main weakness of CE is the high brittleness aer curing and this restricts its extensive application from the mechanics viewpoint. [4][5][6] The common method to improve toughness in a material is incorporating toughening modiers, such as elastomers, thermoplastics, thermosetting resins, and organic or inorganic llers, [7][8][9][10] into polymers. These could improve the impact strength of material, but its dielectric properties and heat resistance show a decline accordingly.…”