Printed in the Republic of Korea
472
/DGEBA
* †
†
(2003. 4. 1 )
Cure Kinetics and Mechanical Interfacial Characteristics of Zeolite/DGEBA Composites
Soo-Jin Park*, Young-Mi Kim, and Jae-Sup Shin†
Advanced Materials Division, Korea Research Institute of Chemical Technology, Taejon 305-600, Korea
†Department of Chemistry, Chungbuk National University, Cheongju 361-763, Korea (Received April 1, 2003)
. ! /DGEBA" # $% &'( ')*+
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: , Diglycidylether of Bisphenol A(DGEBA), , ,
ABSTRACT. In this work, the zeolite/diglycidylether of bisphenol A(DGEBA) systems were investigated in terms of the cure kinetics and mechanical interfacial properties of the composites. The 4, 4-diamino diphenyl methane(DDM) was used as a curing agent for epoxy. Two types of zeolite(PZ) were prepared with 15 and 35 wt% KOH treatments(15-BZ and 35-BZ, respectively) for 24 h, and their surface characteristics were studied by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction(XRD).
Cure kinetics of the composites were examined in the context of differential scanning calorimetry(DSC), and mechanical inter- facial properties were investigated in critical stress intensity factor(KIC) and critical strain energy release rate(GIC). In the results of XPS and XRD, sodium ion(Na) of zeolite was exchanged for potassium ion(K), resulting from the treatment of KOH. Also, Si2p/Al2p composition ratios of the treated zeolite were increased, which could be attributed to the weakening of Al-O bond in framework. Cure activation energy(Ea) of 15-BZ composites was decreased, whereas KIC and GIC were increased, compared with those of the pure zeolite/DGEBA composites. It was probably accounted that the acidity of zeolite was increased by surface treat- ments and the cure reaction between zeolite and epoxy was influenced on the increased acidity of zeolite.
Keywords: Zeolite, Diglycidylether of Bisphenol A(DGEBA), Cure Kinetics, Mechanical Interfacial Properties, Sur- face Treatments
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Table 1. Atom content of zeolite before and after chemical treatments
Elemental analysis (mol.%) Na1S K2p Si2p/Al2p
PZ 6.0 0 94.6
15-BZ 0 5.7 111.0
35-BZ 0 6.6 107.0
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ments.
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Table 3. Cure Activation Energies (Ea) of Zeolite/DGEBA System
Compositions Kinetic factor Heating rate (oC/min)
Linear fit Ea
[kJ/mol]
5 10 15 20
PZ 1/Tm(×103) 2.404 2.315 2.257 2.217
−6.542 54.4 ln[ϕ/Tm2] −10.452 −9.834 −9.479 −9.227
15-BZ 1/Tm(×103) 2.404 2.287 2.239 2.182
−5.487 45.6 ln[ϕ/Tm2] −10.452 −9.858 −9.496 −9.259
35-BZ 1/Tm(×103) 2.398 2.304 2.247 2.208
−6.417 53.4 ln[ϕ/Tm2] −10.457 −9.844 −9.488 −9.236
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GIC (1–ν2)KIC2 ---E
=
Fig. 5. KIC and GIC values of the zeolite/DGEBA studied.
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![Fig. 4. Plots of ln[ϕ /T m 2 ] vs. 1/T m for zeolite/DGEBA system.](https://thumb-ap.123doks.com/thumbv2/123dokinfo/5300561.155290/5.892.133.433.210.452/fig-plots-ln-ϕ-t-vs-zeolite-dgeba.webp)
