Thermal degradation of environmentally friendly phenolic resin/Al₂O₃ hybrid composite

Abstract

An environmentally friendly phenolic resin/Al 2 O 3 hybrid composite was prepared. Al 2 O 3 particles were pretreated with a silcane coupling agent, then the mixture of paraformaldehyde and treated Al 2 O 3 was grinded with ball crusher for several hours, and added during the phenolic resin polymerization process, finally got the hybrid composite. The kinetic parameters of thermal degradation were calculated by the methods of Kissinger, Flynn-Wall-Ozawa and Crane. The thermal degradation activation energy of environmentally friendly phenolic resin/Al 2 O 3 hybrid composite is approximate three times of pure phenolic resin. The results show that the heat resistance is obviously improved.

Suppression of surface charge accumulation on Al2O3-filled epoxy resin insulator under dc voltage by direct fluorination

“…The broad absorption peak from 500 to 950 cm −1 is attributed to the characteristic absorption bands of Al 2 O 3 and the peak at 632 cm −1 is the stretching vibration band of Al-O tetrahedron. 26,27 Compared with the spectrum (a), the spectrum (b)(c)(d) of the fluorinated samples show a substantial change. As can be observed, with the fluorination time increasing, all characteristic absorption peaks corresponding to C-H, C=C, C=O and C-O-C bonds gradually disappear or significantly reduced in its strength.…”

Study on thermal conductive BN/novolac resin composites

“…However, BN particlefilled novolac resin composites have not been studied extensively [1,[15][16][17][18][19]. Thus, this study aims to investigate the thermal conductivity of BN-filled novolac resin and the factors affecting its behavior.…”

“…Previous studies have shows that the change in BN surface from partial ionic to hydrophobic surface led to an increase in BN/epoxy composite thermal conductivity [11]. A coupling agent was also used to form covalent bonds between the organic and inorganic phases, promoting the miscibility of hybrid ceramics [18][19][20][21]. In this study, ␥-aminopropyltriethoxysilane (KH550) was used as the surface treatment agent to increase the BN surface chain length and to make the BN particles more organophilic and connect well with the novolac resin in order to ensure good dispersion and to improve the interface between the filler and the matrix [11].…”

Surface modified Al 2 O 3 in fluorinated polyimide/Al 2 O 3 nanocomposites: Synthesis and characterization

“…Small amounts of Al 2 O 3 nanoparticles dispersed in an epoxy matrix simultaneously improve its stiffness and impact strength whereas failure strain is increased (Wetzel et al 2003). α-Al 2 O 3 is the hardest form of alumina, which is usually used as a filler to improve the mechanical and thermal properties of polymers (Li et al 2010).…”