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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   2007 , Volume 16 , Number 12; Page(s) 829 To 838.
 
Paper: 

STUDY OF THE CURE KINETICS AND WATER ABSORPTION OF THE DGEBA/ODA RESIN

 
 
Author(s):  GHAEMI M.*, HASANPOUR SHAHRIARI A., AMINI NASAB S.M.
 
* DEPARTMENT OF CHEMISTRY, MAZANDARAN UNIVERSITY, BABOLSAR, IRAN
 
Abstract: 

The curing reaction kinetics of an epoxy based on the diglycidyl ether of bisphenol- A (DGEBA) with an aromatic diamine, 4,4'-oxydianiline (ODA), was studied using non-isothermal DSC and FTIR isothermal curing at 120, 135, 160, and 180oC. In all cases, we have observed one exothermic peak during DSC scan up to 350oC. Kinetic parameters such as activation energy (Ea), reaction order, and rate constant were calculated from data obtained from DSC and FTIR tests. The obtained Ea values were 61 and 64 kJ/mol in the dynamic DSC measurements using Kissinger and Ozawa methods, respectively and 36.7 kJ/mol in the isothermal FTIR measurements. Thermodynamic parameters (DH¹, DS¹, and DG¹) were calculated for isothermal curing reaction. The value of DG¹ increased with increasing isothermal curing temperature. Water absorption properties of the cured samples were measured at different temperatures. The diffusion coefficient (D) was in the range of 1.6×10-127.1×10-12 m2/s from room temperature to 65oC. The diffusion activation energy was found to be 26.8 kJ/mol.

 
Keyword(s): CURING OF POLYMERS, RESINS, KINETICS, FTIR, DSC, WATER SORPTION
 
References: 
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