Synthesis and characterization of bis(4‐cyanato 3,5‐dimethylphenyl) naphthyl methane/epoxy/glass fiber composites

Abstract

Bis(4-cyanato 3,5-dimethylphenyl) naphthylmethane was prepared by treating CNBr with bis(4-hydroxy 3,5dimethylphenyl) naphthylmethane in the presence of triethylamine at À5 to 58C. The dicyanate was characterized by FT-IR and NMR techniques. The prepared dicyanate was blended with commercial epoxy resin in different ratios and cured at 1208C for 1 hr, 1808C for 1 hr, and post cured at 2208C for 1 hr using diamino diphenyl methane (DDM) as curing agent. Castings of neat resin and blends were prepared and characterized by FT-IR technique. The morphology of the blends was evaluated by SEM analysis. The composite laminates were also fabricated from the same composition using glass fiber. The mechanical properties like tensile strength, flexural strength, and fracture toughness were measured as per ASTMD 3039, D 790, and D 5528, respectively. The tensile strength increased with increase in cyanate content (3, 6, and 9%) from 322 to 355 MPa. The fracture toughness values also increased from 0.7671 kJ/m 2 for neat epoxy resin to 0.8615 kJ/m 2 for 9% cyanate ester epoxy modified system. The thermal properties were also studied. The 10% weight loss temperature of pure epoxy is 3588C and it increased to 3988C with incorporation of cyanate ester resin. The incorporation of cyanate ester up to 9% loading level does not affect the T g to a very great extent. POLYM. COMPOS., 29:709-716, Synthesis of Monomer PrecursorSynthesis of Bis(4-hydroxy 3,5-dimethylphenyl) Naphthyl Methane. Into a three-necked flask equipped with a condenser, a Dean-stark water separator and a nitrogen Correspondence to: M. Sarojadevi;

Preparation and properties of maleimide‐functionalized hyperbranched polysiloxane and its hybrids based on cyanate ester resin

“…The aim of this article is to develop a new way to toughen and catalyze thermosetting resins. CE resin is selected as the representative of high performance thermosetting resins for this investigation owing to its importance and great potential for many cutting‐edge fields 21–23. Compared with other high performance thermosetting resins, the biggest advantage of CE resin is the extremely low and stable dielectric constant and loss over a wide frequency and temperature range; therefore, how to significantly reduce the curing temperature, and improve the toughness without sacrificing the outstanding dielectric properties is of great interest.…”

Influence of cyanate ester modifier on the thermal, mechanical, and corrosive properties of epoxy composite coating

“…This pronounced improvement may be explained by the presence of the rigid triazine ring structure and the cohesive polymer. [39] Also, the curve features confirm a better toughness of EP and the high brittle nature of the blend resin. [40] F I G U R E 4 Dynamic mechanical thermal analysis (DMTA) curves of pure epoxy and epoxy-cyanate films: storage modulus (a), loss factor (b) [Color figure can be viewed at wileyonlinelibrary.com]…”

“…This pronounced improvement may be explained by the presence of the rigid triazine ring structure and the cohesive polymer. [ 39 ] Also, the curve features confirm a better toughness of EP and the high brittle nature of the blend resin. [ 40 ]…”

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

“…This involves fiber-reinforced composites, which use continuous fabrics of glass or carbon as reinforcements in the polymer matrix. According to Jayakumari, both the pristine blend and fiber-reinforced blend exhibit a similar increasing trend in mechanical properties with increase in the CE content, the only difference being that the values of fiber composites are three to four times more than that of the pristine blend …”

“…According to Jayakumari, both the pristine blend and fiber-reinforced blend exhibit a similar increasing trend in mechanical properties with increase in the CE content, the only difference being that the values of fiber composites are three to four times more than that of the pristine blend. 68 Fibers are often surface treated to increase adhesion with the blend. For example, Ren et al 69 surface-treated carbon fabric with different EP sizing (EP20 and EP51) and used them as reinforcements in a CE matrix.…”