Effect of Interfacial Strength on Thermal/Mechanical Properties of Flexible Epoxy/Clay Nanocomposites

doi:10.11901/1005.3093.2021.142

Chinese Journal of Materials Research

2022, Vol. 36

Issue (6): 454-460 DOI: 10.11901/1005.3093.2021.142

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Effect of Interfacial Strength on Thermal/Mechanical Properties of Flexible Epoxy/Clay Nanocomposites

ZHAO Peng¹, DONG Yingjie¹, LI Xiang¹, CHEN Bin¹(

), ZHANG Ying²(

)

^1.School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
^2.School of Science, Shenyang University of Chemical Technology, Shenyang 110142, China

Cite this article:

ZHAO Peng, DONG Yingjie, LI Xiang, CHEN Bin, ZHANG Ying. Effect of Interfacial Strength on Thermal/Mechanical Properties of Flexible Epoxy/Clay Nanocomposites. Chinese Journal of Materials Research, 2022, 36(6): 454-460.

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Abstract

First, two organic clays, manely reactive BBDMP30-clay and non-reactive CPDMP30-clay were synthesized, and then two epoxy resin/clay nanocomposites with different interfacial strength were prepared with the two organic clays as reinforcer respectively. The two epoxy resin/clay nanocomposites were characterized by transmission electron microscopy (TEM) and tensile test with dynamic mechanical analysis (DMA). Further, the effect of interfacial strength on mechanical properties were investigated. The results show that the two nanocomposites have almost the same random peeling structure. The reactive type BBDMP30-clay can improve the thermal/mechanical properties of the composites more effectively than the non-reactive type CPDMP30-clay. When the clay mass fraction is 3.5%, BBDMP30-clay can increase the tensile strength of nanocomposites by 250%, while CPDMP30-clay can only increase the tensile strength of nanocomposites by 190%. BBDMP30-clay increased the glass transition temperature (T_g) of the nanocomposites by 6.5℃, while CPDMP30-clay only increased the T_g by 2.5℃. These differences can be attributed to the difference of the interfacial strength of the two nanocomposites.

Key words: composite epoxy clay interface mechanical properties

Received: 15 February 2021

ZTFLH:

TQ323.5

Fund: 2019 Education Fund Item of Liaoning Province(LJ2019008);2021 Education Fund Item of Liaoning Province(LJKZ0441)

About author: ZHANG Ying, Tel: (024)89383297, E-mail: syictzhang@qq.com
CHEN Bin, Tel: (024)89388092, E-mail: bchen63@163.com;

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.142 OR https://www.cjmr.org/EN/Y2022/V36/I6/454

Fig.1 Reaction scheme of the synthesis of organic modifier

Fig.2 TEM micrographs of Epoxy/clay nanocomposite synthesized with 3.5% organoclays (a) CPDMP30-clay; (b) BBDMP30-clay

Fig.3 XRD patterns of pristine clay and the nanocomposites with 3.5% (mass fraction) organoclay

Fig.4 TGA curves of BBDMP30-clay and BBDMP30-clay-g-epoxy

Fig.5 Reaction equation of BBDMP30-clay with epoxy resin

Fig.6 Stress-strain curves of pristine epoxy polymer and of epoxy/clay nanocomposites with (a) epoxy/ BBDMP30-clay; (b) epoxy/CPDMP30-clay

Table 1 Tensile properties of neat epoxy and epoxy/clay nanocomposites

Fig.7 tanδ versus temperature plots of neat epoxy polymer and of its nanocomposites

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