Thermal Studies on Chain Extended Bismaleimides

Thermal Studies on Chain Extended Bismaleimides

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2017 by IJETT Journal
Volume-49 Number-1
Year of Publication : 2017
Authors : Thamaraichelvi.C, Vanangamudi .A, Vijayakumar.C.T
DOI :  10.14445/22315381/IJETT-V49P203

Citation 

Thamaraichelvi.C, Vanangamudi .A, Vijayakumar.C.T "Thermal Studies on Chain Extended Bismaleimides", International Journal of Engineering Trends and Technology (IJETT), V49(1),11-26 July 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
4, 4’-Bismaleimidodiphenyl sulphone (BMIS) was synthesized by chemical imidization and chain extended with three different aromatic diamines (4,4’-diaminodiphenyl ether (E) , 4,4’-diaminodiphenyl methane (M) and 4,4’-diaminodiphenyl sulfone (S). The main objective of this work is to study the thermal curing kinetics and thermal degradation kinetics of the different chain extended BMIS resins using Differential Scanning Calorimeter (DSC), Thermo Gravimetric Analysis (TGA) and Differential Thermo Gravimetry (DTG). Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa and Friedman methods were adopted to compute apparent activation energy for the curing kinetics and degradation kinetics. Exothermic transition indicative of curing was observed in DSC traces in the temperature range of 50-4500C. The onset curing temperature for the chain extended BMIS decreases nearly 500C compared to pure BMIS. The apparent activation energy (Ea) values for curing of the chain extended BMIS decreases compared to BMIS. The apparent activation energy values for the thermal degradation of the chain extended bismaleimides are low after the reaction extent 0.5 compared to pure BMIS. Char yield was not significantly affected when pure bismaleimides were extended by aromatic diamines.

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Keywords
Bismaleimides, Chain extension, DSC, Curing kinetics, TGA, Degradation kinetics.