Abstract
This study involved an evaluation of the influence of phase inversion in poly(methyl methacrylate) elastomer/poly(ethylene terephthalate) binary blends (PMMAelast/PET) and the effect of the addition of poly(methyl methacrylate-glycidyl methacrylate-ethyl acrylate) (MGE) interfacial compatibilizer on the microrheological properties of this polymer blend. Thermal, dynamic mechanical thermal, rheological and morphological analyses were performed using sensitive techniques such as differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), parallel plates rheometry in the linear viscoelastic region, and atomic force microscopy (AFM), respectively. In this study, it was found that variations in the percentage of the PET phase influenced the correlation between the rheological properties at low shear rates and the morphology of the PMMAelast/PET binary blend and of the PMMAelast/PET/MGE compatibilized blend
Highlights
PMMA/PET blends are used in electrical and automotive applications which require materials with good dimensional stability, mainly for electronic circuits
Thermal characterizations were performed by Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Thermal Analysis (DMTA) to evaluate the parameters that affect processability and the effects of the MGE compatibilizer on the PMMAelast/
The Tg of the elastomeric phase was not measured by this technique and the Tg of the PET in the PMMAelast/PET blends was not measured due to overlapping with the Tg peak of the PMMA
Summary
PMMA/PET blends are used in electrical and automotive applications which require materials with good dimensional stability, mainly for electronic circuits These polymer blends are immiscible and incompatible[1,2,3,4] so they require the addition of an interfacial compatibilizer to improve the dispersion of the dispersed phase, thereby reducing the interfacial tension, stabilizing the morphology by reducing coalescence, and improving the interfacial adhesion between the phases[5,6]. Microscopic characterizations by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) can provide evidence of the efficiency of compatibilization in polymer blends. In studies using MGE terpolymer as a compatibilizer for PBT/ ABS, PBT/AES and PBT/SAN blends , 8-12 it was found that the GMA epoxy group can react with the PBT terminal groups and may lead to the formation of a copolymer (PBT-g-MGE) at the interface of these polymer blends during the melt processing, which will alter their final properties
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