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Two series of poly(e-caprolactone) nanocomposites with different   organo-modified clays (1 to 8 wt%) were prepared by the solution casting   method. Organoclays with polar (Cloisite®C30B) and nonpolar (Cloisite®C15A)   organic modifier and with different miscibility with poly(e-caprolactone)   matrix, were chosen. Exfoliated and/or intercalated nanocomposite’s   structures were obtained by using high dilution and an ultrasonic treatment   for the composite preparation. The effect of the surface modification and   clay content on the morphology, mechanical and thermal properties of the   nanocomposites was studied. Scanning electron microscopy excluded the   formation of microcomposite. The wide-angle X-ray diffraction analysis   revealed that the tendency toward exfoliated structure is higher for the   Cloisite®C30B, which had better miscibility with poly(e-caprolactone) matrix.   Differences in spherulites’ sizes and morphology between two series of the   nanocomposites were observed by the optical microscopy performed on as-casted   films. Enthalpies of fusion and degrees of crystallinity were higher for   nanocomposites than for neat poly(e-caprolactone) and increase with the clay   loading in both series, as a consequence of the clay nucleating effect.   Decreased thermal stability of nanocomposites was ascribed to thermal   instability of organic modifiers of the clays. The Halpin-Tsai model was used   to compare the theoretically predicted values of the Young’s modulus with   experimentally obtained ones in tensile tests.[Projekat Ministarstva nauke   Republike Srbije, br. 172062

Influence of clay organic modifier on morphology and performance of poly(ε-caprolactone)/clay nanocomposites