کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
692329 | 1460515 | 2015 | 9 صفحه PDF | دانلود رایگان |
• Clay has catalytic effect on curing process of epoxidized soybean oil modified epoxy.
• Nanoclay enhanced the integral procedural decomposition temperature and decomposed activation energy of modified epoxy.
• Glass transition temperature and storage modulus of the nanocomposite is higher than base matrix.
• Addition of C30B nanoclay reduced the expansion coefficient of modified epoxy blend.
In the current study, nano-clay was incorporated in toughened epoxy modified with epoxidized soybean oil (ESO) to improve the mechanical and thermal properties. Curing behavior was studied by Fourier Transform Infrared spectroscopy and Differential Scanning Calorimetry analysis to investigate the effect of ESO bioresin and nanoclay on cross-linking reaction. The increase in enthalpy of curing reaction and decrease in peak temperature of nanocomposite corroborated the catalytic effect of clay on the curing process. The thermal stability parameters like integral procedural decomposition temperature and decomposed activation energy were determined using Horowitz and Metzger equation. Dynamic mechanical analysis demonstrated the high storage modulus, improved crosslink density and good damping behavior of nanocomposite. Thermo mechanical analyzer was used to examine the coefficient of thermal expansion (CTE) of bio-based epoxy blend and nanocomposite in both glassy and rubbery region. The CTE value is decreased after addition of clay to the modified epoxy blend which confirmed the improved dimensional stability of the nanocomposite. TEM and X-ray diffraction analysis confirmed both intercalated and exfoliated clay platelet within the epoxy blend.
Journal: Progress in Organic Coatings - Volume 88, November 2015, Pages 263–271