Abstract
A range of Schiff base functionalized cyanate esters and their precursors were prepared in high yield and characterized using Fourier transform infrared, 1H-nuclear magnetic resonance spectroscopy and elemental analysis. One of the dicyanates was blended with bismaleimide (BMI) at various proportions to increase the toughness of BMI. The thermally initiated polymerization was studied by differential scanning calorimetry. Cure studies reveal that BT4 (1: 1 weight ratio of cyanate ester and BMI) was more compatible. The thermal stability of the bismaleimide-riazine (BT) resins was studied using TGA. The 10% weight loss temperatures in N2 were above 380°C with char yield in the range of 72-86%. Moisture absorption of these blends was in the range of 0.3-2%. Chemical resistance of the BT resins was also studied towards acids, alkali and ketone solvent.
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