Preparation, characterization and thermal properties of titanium- and silicon-modified novolac resins

Abstract

Titanium-and silicon-modified novolac (TSN) resins were prepared by the reaction of novolac resin with the organotitanium polysiloxane. TSN resins with a series of inorganic element contents were prepared, and the corresponding silicon fiber reinforced TSN composites (TSN/silica fiber) were fabricated by the compression molding procedure. The results of thermogravimetric analysis show that the thermal stability of TSN resins were improved by the introduction of inorganic element, both for the initial decomposition temperature and char yields. As the inorganic element increase, the thermal stability also increases initially and then subsequently decreases. Meanwhile, the storage modulus and glass transition temperature (T g ) of TSN resin composites were improved. TSN-3.12 composite shows the best thermal stability with T g at 290 C, which was 37 C higher than that of the neat resin composite.

Microwave-assisted synthesis and characterization of resole-type phenolic resins

“…The formation of similar products during the resole formation was also found by various workers in the past. 19,[24][25][26][27][28][29][30][31][32][33][34][35] Heat curing, the most important cross-linking process, was adopted for the resole in this investigation. The curing temperature was considered at 100 C. This was obtained by heating the sample in a DSC pan.…”

“…Lee et al, 29 Guo et al, 30 Thomas et al, 31 Deng et al 32 , Gorman and Btanchaud, 33 Dahl et al, 34 and Kin-Tak and Fedrigo 19 identified such compounds during curing of resole prepolymer by different techniques, namely, 13 C NMR, 1 H NMR, IR, solid-state cross-polarization magic angle spinning, and X-ray analyses. Recently, Li et al 27 also concluded the formation of such products (as shown in Figures 1 and 8) with DSC and TG analyses while seeing the effect of various parameters during the resole synthesis.…”

Effect of several modifiers on the mechanical and tribological properties of phenol formaldehyde resin

“…Phenol formaldehyde (PF) resin is widely used in the automobile and aviation industries due to its good thermal stability, wear resistance, chemical resistance, electrical resistivity, and dimensional stability. 1 –3 However, the application of PF resin is usually limited due to brittleness and the relatively high friction coefficient. 4 –6 Many studies have been conducted to improve the toughness of PF resin.…”

A new high performance novolac-based polytriazole resin

“…1,2 There are numerous ways to modify novolac resin. [3][4][5][6] One common way is to develop addition-cure phenolics, [7][8][9][10][11][12][13][14][15] including the introduction of allyl groups, maleimide groups, phenylethynyl groups, epoxy groups, benzoxazoline structure, benzoxazine structure, phenoltriazine structure, arylacetylene groups, phthalonitrile groups, ethynyl phenyl azo groups, and propargyl ether groups (propargylated novolac (PN) resins). Bindu et al 16 and Wang et al 17 have particularly investigated PN resins, and cured PN resins show improved thermal properties compared with the original novolac resin.…”