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  Sci. Lett. J. 2012, 1: 17  
  Research Article
  Full Text
Degradation kinetics of bismaleimide - natural clay composites  
  Chinnaswamy Thangavel Vijayakumara, Rajendran Surendera, Karnan Thenmozhib, Palanichamy Sivasamyb, Sarfaraz Alamc  
     
a Department of Polymer Technology, Kamaraj College of Engineering and Technology, S. P. G. C. Nagar, K. Vellakulam Post - 625 701, India
b Post graduate and Research Department of Chemistry, Ayya Nadar Janaki Ammal College, Sivakasi - 626 124, India
c Defence Materials and Stores Research and Development Establishment (DMSRDE), G. T. Road, Kanpur - 208 013, India

   
  Abstract  
  Purified natural clay is blended with bismaleimide, 4,4’-bismaleimidodiphenyl methane (BMIM), in three different ratios (1, 3 and 5%) in acetone ultrasonically. Natural clay (3%) is intimately ground with BMIM. The pure BMIM and its clay blends are thermally cured at 250 °C for 10 h. FTIR results reveal that the clay particles do not have any strong interaction with the BMIM. Presence of clay particles in the thermally cured BMIM affects the onset temperature of the primary thermal degradation. The degradation kinetics for the initial degradation stage of the materials is performed by Flynn-Wall-Ozawa method. The trend in the variation of the activation energy for the degradation of BMIM is not much affected by the natural clay particles incorporated in BMIM. But the presence of clay particles affects the activation energy for the thermal degradation process of cured BMIM. The way in which the clay is blended with BMIM also influences the degradation behavior of BMIM. The uniform dispersion of clay particles in BMIM is confirmed by SEM analysis.  
     
  Keywords  
  Bismaleimide; Natural clay; FTIR; TGA; Degradation kinetics  
     
   
     
 
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