The morphology and deformation behavior of poly(butylene terephthalate)/BPA polycarbonate blends |
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Authors: | S. Y. Hobbs M. E. J. Dekkers V. H. Watkins |
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Affiliation: | (1) Corporate Research and Development Center, General Electric Company, 12301 Schenectady, NY, USA |
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Abstract: | Summary In this communication the results of a series of recent studies of the morphology and deformation behavior of toughened poly(butylene terephthalate) (PBT)/BPA polycarbonate (PC) blends are briefly summarized. Several papers containing a more detailed account are currently in press (1–3). Among the unique morphological features of these blends are the consistent isolation of the core/shell impact modifier (IM) in the PC phase and the crystallization and phase separation of the PBT from the partially miscible PBT/PC melt on slow cooling. DSC studies provide corroborating evidence for melt miscibility of the two resins. The blends deform through a combination of cavitation and shear processes. In all cases cavitation occurs exclusively within the IM particles and is suppressed at higher PC concentrations and elevated temperatures. |
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