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Synthesis and Cure Behaviors of Diglycidylether of Bisphenol-S Epoxy Resins  

박수진 (한국화학연구원 화학소재연구부)
김범용 (한국화학연구원 화학소재연구부)
이재락 (한국화학연구원 화학소재연구부)
신재섭 (충북대학교 화학과)
Publication Information
Polymer(Korea) / v.26, no.4, 2002 , pp. 501-507 More about this Journal
Abstract
In this work, diglycidylether of bisphenol-S (DGEBS) epoxy resin was prepared by alkaline condensation of bisphenol-S (BPS) with epichlorohydrin (ECH) in the presence of NaOH catalyst. The structure of the synthesized DGEBS epoxy resin was confirmed by IR, NMR spectra, and elemental analysis. The curing reaction and glass transition temperature ($T_g$) of DGEBS epoxy resin cured with phthalic anhydride (PA) and tetrahydrophthalic anhydride (THPA) at curing agents were studied by dynamic differential scanning calorimetry (DSC). The thermal stability of the cured specimen was investigated by thermogravimetric analysis (TGA). As a result, the activation energy ($E_a$) of DGEBS/PA system was higher than that of DGEBS/THPA system, whereas $T_g$, initial decomposed temperature (IDT), and decomposition activation energy ($E_t$) of DGEBS/PA were lower than those of DGEBS/THPA. This was probably due to the fact that the crosslinking density of DGEBS/THPA was increased by ring strain of curing agent.
Keywords
bisphenol-S; epoxy resin; glass transition temperature; thermal stability; activation energy;
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