Preparation and Properties of Novel Cyclophosphazenes Containing Cyanato Groups

Thermal and mechanical properties of azomethine functionalized cyanate ester/epoxy blends

“…However, the cured CE is inherently brittle in nature and easily undergoes microcracking under service loads. The fracture toughness of cyanate esters can be improved by blending them with thermoplastic tougheners, rubber, 11 organic and inorganic llers, 6,12 POSS [13][14][15] and thermosetting resins such as epoxy, [16][17][18][19][20] imides [21][22][23][24] and benzoxazines. 25,26 The commercially available cyanate ester bisphenol A dicyanate ester (BADCY) is widely used in various elds, but further modication is required to enhance its performance properties and reduce the cost of production.…”

Synthesis of branched benzoxazine monomers with high molecular mass, wide processing window, and properties of corresponding polybenzoxazines

“…It is well known that hexachlorocyclotriphosphazene is a highly active intermediate that possesses six replaceable chlorine atoms linked to the phosphorus atoms of the phosphazene ring. Such a character endows cyclotriphosphazenes with a high degree of tailorability through variations in the synthesis procedures . The benzoxazine monomers were prepared according to Scheme , and many researchers have proved that this nucleophilic substitution reaction is nearly a stepwise displacement mechanism.…”

Synthesis and Characterisation of Phosphazene Derivatives Containing Dioxybiphenyl and 4-Sulfanylquinazoline Groups

“…of 4-hydroxybenzaldehyde with 2 in the presence of K 2 CO 3 in THF gave 2,2-bis(4-formylphenoxy)-4,4,6,6-bis[spiro(2ʹ,2ʹʹ-dioxy-1ʹ,1ʹʹ-biphenylyl)]cyclotriphosphazene (3). The new phosphazene derivative containing a 4-quinazolinone group, 2,2-bis[4-(4-quinazolinone)phenoxy]-4,4,6,6bis[spiro(2ʹ,2ʹʹ-dioxy-1ʹ,1ʹʹ-biphenylyl)]cyclotriphosphazene (4) was synthesised from the reaction of 3 with anthranilamide in the presence of NaHSO 3 in N,N-dimethylformamide (DMF). Disubstituted derivatives were then obtained in high yields from the reactions of 4 under mild conditions with p-thiocresol, 4-chlorothiophenol, 4-aminothiophenol, 4-chlorobenzenemethanethiol in DMF (DMF-CH 2 Cl 2 ) in the presence of TsCl, DMAP, and Et 3 N through the C-OH bond activation.…”

“…Cyclophosphazenes are important heterocyclic substances due to their fire-retardant properties, high refractive indices, and potential application in non-linear optics. [1][2][3][4] The variety of substitution reactions of the reactive P-Cl bonds provide a wide range of cyclophosphazene derivatives which have diverse applications. [5][6][7][8][9][10] These derivatives are usually prepared by nucleophilic substitution reactions using alcohol, phenol, amines, Grignard reagents and thiols.…”