Please use this identifier to cite or link to this item:
http://nopr.niscpr.res.in/handle/123456789/24470| Title: | Spectroscopic studies on curing of novolac epoxy resin—Polyamide and polyamine hardener systems in presence of a polysulphide |
| Authors: | Makashir, P S Agawane, NT Mahajan, R R Agrawal, J P |
| Issue Date: | Dec-2001 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Novolac epoxy resins have recently been reported for inhibition of hydroxy terminated polybutadiene (HTPB) based composite propellants and their elongation has been improved by the incorporation of some flexibilizers. In the present investigation, curing behaviour of a novolac epoxy resin (Dobeckot E4) by hardeners (polyamide EH 411 and polyamine H 758) in conjunction with a polysulphide flexibilizer has been studied using infrared (IR) spectroscopy. It is observed that the rate of curing of Dobeckot E4 by hardeners such as hardener EH411 and hardener H 758, is higher as compared to polysulphide flexibilizer LP-33. Further, rate of curing of epoxy resin by hardeners such as EH411 and H758 enhances in the presence of flexibilizer LP-33. The curing studies by infrared (IR) spectroscopy suggest that hardeners EH41l/H758 react with epoxy ring of epoxy resin and as a result, epoxy ring opens while curing. Similarly, -SH group of polysulphide flexibilizer LP-33, reacts with the epoxy ring of resin and opens it as curing progresses and thus enhances the rate of curing of epoxy resin in conjunction with hardeners EH411/H758. This is also supported by the gel time and exotherm peak temperature data. |
| Page(s): | 381-385 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Appears in Collections: | IJEMS Vol.08(6) [December 2001] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJEMS 8(6) 381-385.pdf | 1.15 MB | Adobe PDF | View/Open |
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.