Influence of the process parameters of an intermeshing co‐rotating twin screw extruder on the morphology and notched Izod impact strength of PBT/ABS/MGE blends

Ambrósio, José Donato; Larocca, Nelson M.; Pessan, Luiz Antônio; Hage, Elias

doi:10.1002/pen.21761

Cited by 10 publications

(12 citation statements)

References 37 publications

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“…The MGE terpolymer used as compatibilizer for the PBT/ABS blends was synthesized by bulk copolymerization using the following composition: methyl methacrylate (MMA) (88 wt%), glycidyl methacrylate (GMA) (10 wt%) and ethyl acrylate (EA) (2 wt%) 27,28 . EA was used mainly to enhance the thermal stability and prevent unzipping degradation to the final copolymer during melt mixing.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the second heat could be really useful to show essential modifications on the melting behavior of the blends due to the blending extrusion. It is well known that the process parameters may have strong influence on the mechanical behavior of blends 28 . For the uncompatibilized binary PBT/ABS blends the influence of the screw profile in the extruder on its thermal behavior was not significant, as comparing samples NCB1 and NCB2.…”

Section: Influence Of Processing Parameters On the Melting And Crystamentioning

confidence: 99%

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The effect of extrusion conditions and the use of a compatibilizer in the crystallization of PBT/ABS blends

et al. 2013

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Poly(butylene terephthalate) (PBT)/ acrylonitrile-butadiene-styrene (ABS) terpolymer blends were prepared in a twin screw extruder and the use of methyl methacrylate-glycidyl methacrylate-ethyl acrylate (MGE) terpolymer as compatibilization additive was evaluated. The effect of different screw profiles and mixing conditions were evaluated on the crystallization of the blends. Differential scanning calorimetry (DSC) was used to evaluate melting and crystallization behaviors of the PBT/ABS blends. The binary PBT/ABS blend has shown a double melting peak when cooled at lower cooling rates, mainly due to its melt-recrystallization during the heating up step. ABS has not affected the melting characteristics of neat PBT. The presence of MGE, as a reactive compatibilizer, in the PBT/ABS blends has reduced its heat of fusion and has partially inhibited its melt-recrystallization under heating. As result, it has prevented the occurrence of double melting peak. The epoxy functional groups of the MGE may react in situ to the carbonyls and hydroxyls end groups of the PBT molecules, thereby hindering the mobility of PBT molecules during the crystallization process due to its grafting to the compatibilizer molecules. The melt mixed blends prepared at lower feeding rate have shown a higher degree of crystallinity for the PBT/ABS blend, probably due to degradation of PBT caused by longer residence time in the extruder. The highest shear stress imposed to the blends at higher screw speed increased the degree of crystallinity of PBT, also due to its degradation.

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Section: Methodsmentioning

confidence: 99%

Section: Influence Of Processing Parameters On the Melting And Crystamentioning

confidence: 99%

The effect of extrusion conditions and the use of a compatibilizer in the crystallization of PBT/ABS blends

et al. 2013

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“…It is observed that a low breaking of the agglomerates into smaller particles occurred, showing that the breaking and coalescence process entered into equilibrium, and the smaller particles were not completely separated. In the PBT/ABS (70/30) blends compatibilized with MGE, the separation in smaller particles was clearly verified [6][7][8] . Table 2 shows that the blends processed at 120 rpm presented a higher dispersion degree than those processed at 240 rpm.…”

Section: Resultsmentioning

confidence: 85%

“…The PBT toughening can be obtained by adding the acrylonitrilebutadiene-styrene copolymer (ABS), which is a thermoplastic modified with rubber. In this sense, the blend of PBT/ABS has been extensively studied [1][2][3][4][5][6][7][8] . This blend has a high impact resistance when tested with notch at room temperature, but brittle behavior at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…PBT/ABS (70/30) blend compatibilized in situ with the terpolymer methyl methacrylate-glycidyl methacrylate-ethyl acrylate (MGE) presents high impact resistance at low temperature. PBT/ ABS blend was studied to verify the influence of the process parameters on the morphology and end properties [7][8][9][10] . The results were very satisfactory and MGE stabilized morphology of the blend preventing coalescence of the dispersed phase, but partially reducing the influence of process parameters on the morphology of the blend.…”

Section: Introductionmentioning

confidence: 99%

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Correlation between Processing, Morphology and Impact Resistance of PBT/ABS Blends

et al. 2017

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To understand the processing influence in an intermeshing corotating twin-screw extrusion (ICTSE) on the morphology and impact properties of the uncompatibilized PBT/ABS (70/30) blend, it was submitted to different processing parameters. In this way both morphology and impact properties (resistance and ductile brittle transition temperature (DBTT) would be a function of processing only, because there would be no influence of a compatibilizer. The rotation speed of the screws influenced both impact resistance and Ductile Brittle Transition Temperature (DBTT) of the PBT/ABS blends. Blends prepared with higher rotation speed (240 rpm) did not present toughness at room temperature, whereas the blends prepared at lower speed showed high impact strength at room temperature and DBTT near to 5 °C. The angle between the kneading blocks discs also influenced the impact properties, because blends processed with screw with 90º angle between kneading block disks, for two different feed rates, showed lower DBTT than the blends processed with 45º angle. The morphological analysis by TEM showed that blends processed at low rotation speed of the screws presented a higher dispersion degree than those processed at high rotation speed. Blends processed in screws where the angle between the disks was 90º showed a higher dispersion degree than the blends processed in disks with a 45º angle. These results are in agreement with the impact properties, confirming that high dispersion of the ABS particles improves the impact properties of the blend.

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Polymer Blend Compatibilization by Copolymers and Functional Polymers

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Encyclopedia of Polymer Blends

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Influence of the process parameters of an intermeshing co‐rotating twin screw extruder on the morphology and notched Izod impact strength of PBT/ABS/MGE blends

Cited by 10 publications

References 37 publications

The effect of extrusion conditions and the use of a compatibilizer in the crystallization of PBT/ABS blends

The effect of extrusion conditions and the use of a compatibilizer in the crystallization of PBT/ABS blends

Correlation between Processing, Morphology and Impact Resistance of PBT/ABS Blends

Polymer Blend Compatibilization by Copolymers and Functional Polymers

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