Effect of matrix viscosity on clay dispersion in preparation of polymer/organoclay nanocomposites |
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| Authors: | Moon Bae Ko Jae Young Jho Won Ho Jo Moo Sung Lee |
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| Institution: | (1) Hyperstructured Organic Materials Research Center and School of Material Science and Engineering, Seoul National University, 151-742 Seoul, Korea;(2) Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University, 151-742 Seoul, Korea;(3) Department of Textile Engineering and Advanced Materials Research Institute, Chonnam National University, 500-757 Kwangju, Korea |
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| Abstract: | The viscosity effect of matrix polymer on melt exfoliation behavior of an organoclay in poly(ε-caprolactone) (PCL) was investigated. The viscosity of matrix polymer was controlled by changing the molecular weight of
poly(ε-caprolactone), the processing temperature, and the rotor speed of a mini-molder. Applied shear stress facilitates the diffusion
of polymer chains into the gallery of silicate layers by breaking silicate agglomerates down into smaller primary particles.
When the viscosity of PCL is lower, silicate agglomerates are not perfectly broken into smaller primary particles. At higher
viscosity, all of silicate agglomerates are broken down into primary particles, and finally into smaller nano-scale building
blocks. It was also found that the degree of exfoliation of silicate layers is dependent upon not only the viscosity of matrix
but thermodynamic variables. |
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| Keywords: | Clay Nanocomposite Intercalation Exfoliation |
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