writer：Defeng Wu, Chixing Zhou, Wei Yu, Fan Xie.
keywords：flocculation; rheology; PBT; clay; nanocomposites.
source：期刊
specific source：Journal of Polymer Science Part B: Polymer Physics
Issue time：2005年

Journal of Polymer Science Part B: Polymer Physics, 2005, 43, 2807-2818.

ABSTRACT: The microstructure and rheological property of poly(butylene terephthalate) (PBT)/epoxy/montmorillonite nanocomposites (PCNs) were investigated. For the study, PCNs were prepared by melt intercalation in clay content of 4wt% and, epoxy loadings were varied from 2 to 4wt%. The intercalated PCNs are characterized by different techniques such as transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and rheology. It is interesting that the percolated tactoids network in the ternary hybrids becomes insensitive to the shear deformation with the addition of epoxy in contrast to that in the sample without epoxy, which can be attributed to the formation of a flocculated structure of clay tactoids due to the chain extension reactions between PBT matrix and epoxy and possible hydrogen bonding. The flocculated structure has influence on the rheological behavior of the hybrids remarkably, strengthening the percolated strong-associated-tactoids network and reducing the percolation threshold, while not changing the strain-scaling.