The influence of epoxy resin on the morphological and rheological properties of PET/PA66 blend |
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Authors: | Hamed Khoshnevis Ali Zadhoush |
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Institution: | (1) Department of Textile Engineering, Isfahan University of Thechnology, Isfahan, 84154-83111, Iran; |
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Abstract: | Interfacial reactions have dominant effects on the morphological and rheological properties of compatibilized polymer blends.
This work aims to investigate the effect of epoxy resin, as a coupling agent, on the interface properties and subsequent influences
on the morphological and rheological properties of polyethylene terephthalate/polyamide66 (PET/PA66) blend. PET/PA66 70/30
blends with different amount of bisphenol A epoxy resin (0, 1, 3, and 5 wt.%) were prepared. SEM micrographs show reduction
in droplet size with increasing epoxy resin concentration, confirming the reactive compatibilizing effect of the epoxy resin.
Reactions at the interface of the PET-EP-PA66 blend are confirmed by FTIR spectra. Shear viscosity results demonstrates that
adding epoxy resin could suppress the interfacial slip at the blend interphase. Obtained results from storage modulus (G′)
curves show the presence of one plateau for the blends at low frequency region; nevertheless, relaxation spectra indicate
the presence of two more relaxation mechanisms than precursors which are related to the shape relaxation of droplets and the
interface relaxation. The presence of the interface relaxation time in the blend without epoxy resin can prove the presence
of reactions between two condensation polymers; however, adding the epoxy resin results in reducing both relaxation time and
interfacial tension and increasing interfacial shear modulus. These observations indicate that the epoxy resin has been successful
to boost the reactions at the interface between two polymers. Fitting the obtained experimental data using Palierne model
indicates that the general Palierne model could describe rheological properties of the blends very well. |
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