Table of Contents
Indian Journal of Materials Science
Volume 2013 (2013), Article ID 892371, 6 pages
http://dx.doi.org/10.1155/2013/892371
Research Article

Thermal Study of Anhydrides Cured Tetrafunctional Cardo Epoxy Resin

Polymer Chemistry Division, Department of Chemistry UGC-SAP and DST-FIST, Saurashtra University, Rajkot, Gujarat 360 005, India

Received 17 June 2013; Accepted 6 August 2013

Academic Editors: D. Das and S. Thomas

Copyright © 2013 Jignesh P. Patel and Parsotam H. Parsania. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tetrafunctional cardo epoxy resin (EBCF) was cured by using 10 wt% maleic anhydride (MA), pyromellitic dianhydride (PMDA), phthalic anhydride (PA), tetrahydrophthalic anhydride (THPA), tetrabromophthalic anhydride (TBPA), and tetrachlorophthalic anhydride (TCPA) as hardeners at 120°C for 40–105 min (gel time) and then postcured 1 h at 130°C. Gel time is found to depend on the structure of the anhydrides used. Cured samples were found insoluble in common solvents. Cured and uncured EBCF were characterized by FTIR, DSC, and TGA techniques. Cured and uncured resins followed multistep degradation reactions. Kinetic parameters, namely, order of degradation, energy of activation, frequency factor, and entropy change, were determined according to the Anderson-Freeman method and interpreted in light of the nature of hardeners used for curing purpose. The resins followed integral or fractional order degradation kinetics. Complex degradation reactions are due to different types of linkages in cured resins. Both nature and structure of resin and hardeners affected the curing behavior and the resultant thermal properties of the cured resins.