Residual Stress Behavior and Physical Properties of Transparent Polyimide/ Surface-Modified CaCO3 Nanocomposite Films

다국어 초록 (Multilingual Abstract)

A series of polyimide (PI) nanocomposite films with various surface-modified colloidal calcium carbonate(SCaCO3) contents were prepared and their physical properties were investigated to understand their possible useas polymer substrates. The morphology, thermal stability, residual stress behavior, moisture barrier and optical propertiesof nanocomposite films were investigated as a function of the SCaCO3 content and were found to be stronglydependent upon the chemical and morphological structures. With the addition of up to 0.5 wt% SCaCO3 in the PImatrix, resultant nanocomposite films exhibit not only enhanced thermal properties, but also minimized residualstress and excellent optical properties, simultaneously. With increasing SCaCO3 content, the water vapor transmissionrate (WVTR) is greatly decreased from 630.76 to 484.22 g/m2/day. The residual stress was in the range of 26.0to 12.1 MPa and is highly dependent on both temperature variation and SCaCO3 content. Although the residual stressbecomes lower at 0.5 wt% SCaCO3 content, it increases at relatively high SCaCO3 loadings due to inadequate dispersionof the SCaCO3 and low interfacial interactions between the polymer and filler surfaces. Therefore, furtherstudies are needed to maximize the performance of nanocomposite films by enhancing the compatibility of the polymermatrix and fillers.

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