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Farmahini-Farahani, M. ; Jafari, S.H. ; Khonakdar, H. A. ; Böhme, F. ; Komber, H. ; Yavari, A. ; Tarameshloo, M.
Investigation of exchange reactions and rheologiecal response of the reactive blends of poly(trimethylene terephthalate) and phenoxy resin

BACKGROUND: Reactive melt blends of poly(trimethylene terephthalate) (PTT) with a phenoxy resin (Ph) are some of the most interesting classes of reactive blends in which different kinds of exchange reactions can occur. This work is devoted to the study of these reactions and their effect on the rheological and morphological properties of the blends.

RESULTS: The occurrence of transesterification reactions was confirmed by 1H NMR analysis. Scanning electron microscopy observations confirmed that all the blends, except PTT/Ph 90/10 (w/w), which exhibits a droplet-in-matrix morphology, are homogeneous. At the beginning of transesterification, the melt viscosity of the blends is more influenced by molar mass increasing reactions than by molar mass decreasing ones. After extension of the reaction time and increase in temperature the molar mass reducing reactions become predominant, which results in a reduction of the complex viscosities

.CONCLUSION: This work provides new data on the transesterification reactions involving the secondary hydroxyl groups of phenoxy. The properties of PTT/Ph blends are strongly determined by the transesterification reactions, which on the one hand results in the formation of PTT-grafted phenoxy chains and on the other hand a decrease in the molar mass of non-bonded PTT. These reactions exert a distinct compatibilizing effect between the blend components. Copyright © 2008 Society of Chemical Industry

Source
Polymer International 57

Pages
612-617

DOI
http://dx.doi.org/10.1002/pi.2384

Published
March 2008
 
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