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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 2
BKCSDE 30(2)
February 20, 2009 

Thermal Stability of Trifunctional Epoxy Resins Modified with Nanosized Calcium Carbonate
Fan Long Jin, Soo Jin Park*
Glass transition, Curing of polymers, Nanocomposites, Thermal properties, Crosslinking
Trifunctional epoxy resin triglycidyl paraaminophenol (TGPAP)/CaCO3 nanocomposites were prepared using the melt blending method. The effects of nano-CaCO3 content on the thermal behaviors, such as cure behavior, glass transition temperature (Tg), thermal stability, and the coefficient of thermal extension (CTE), were investigated by several techniques. Differential scanning calorimetry (DSC) results indicated that the cure reaction of the TGPAP epoxy resin was accelerated with the addition of nano-CaCO3. When the nano-CaCO3 content was increased, the Tg of the TGPAP/CaCO3 nanocomposites did not obviously change, whereas the crosslinking density was linearly increased. The nanocomposites showed a higher thermal stability than that of the neat epoxy resin. This result could be attributed to the increased surface contact area between the nano-CaCO3 particles and the epoxy matrix, as well as the high crosslinking density in the TGPAP/CaCO3 nanocomposites. The CTE of the nanocomposites in the rubbery region was significantly decreased as the nano-CaCO3 content was increased.
334 - 338
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