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  Sci. Lett. J. 2017, 5: 240  
  Research Article
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Bis(isomaleimide) and diphenol blends: Part 1 Studies on thermal curing and thermal degradation  
  V. Sarannyaa, S. ShamimRishwanab, R. Surenderc, R. Mahalakshmya, C. T. Vijayakumarc  
a Postgraduate and Research Department of Chemistry, Thiagarajar College, Madurai 625009, India
b Department of Chemistry, Kamaraj College of Engineering and Technology, K. Vellakulam Post 625 701, India
c Department of Polymer Technology, Kamaraj College of Engineering and Technology, K. Vellakulam Post 625 701, India

  Blends of 4,4’-bisisomaleimidodiphenyl methane with structurally different diphenols are made in 1:1 mol ratio. The blends are thermally polymerized. The structural characterization of the materials was done by Fourier transform infrared spectroscopy. The presence of an absorption band at 3360 cm-1 in the FTIR spectra of the polymers confirms the presence of phenolic OH groups in the materials. This confirms the reaction between the two materials during the polymerization reaction. Detailed differential scanning calorimetric studies reveal the complexity of the reaction as evidenced by the melting characteristics and the variation in the curing exotherm. Thermogravimetric studies of the cured materials show that the thermal stability, the degradation pattern and the char yield are much dependent on the structure of the diphenol that is used for blending. The decreased thermal stability of the materials from the blends may be attributed to the decreased cross links owing to the opening of the isomaleimide rings by the diphenols during thermal polymerization.  
  Bis(isomaleimide); Diphenols; FTIR; DSC; TGA  
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