Rheology and Morphology of Reactively Compatibilized PP/PA6 Blends

Abstract

This work aims to use the Palierne emulsion type model to describe the relationship between the rheological response to small amplitude oscillatory deformation and morphology of polypropylene/ polyamide 6 (PP/PA6) blends compatibilized with maleic anhydride grafted polypropylene (PP-g-MAH). It was found that the Palierne emulsion type model could describe very well the linear viscoelastic responses of binary uncompatibilized PP/PA6 blends and failed to describe the ternary compatibilized PP/PP-g-MAH/PA6 blends. These features could be attributed to the fact that the morphology of the ternary blends was not of the emulsion type with the PA6 particles dispersed in the PP matrix but of an emulsion-in-emulsion type, i.e., PA6 particles dispersed in the PP matrix themselves contained PP or PP-g-MAH inclusions. By consideration of PP-in-PA6 particles as pure PA6 particles, where the volume fraction of the PA6 phase was increased accordingly, the Palierne emulsion type model could work very well for a ternary blending system. Preshear at low frequencies modified the morphology of both binary and ternary blends. The particles of the dispersed phase (PA6) became more uniform. These results suggested that the Palierne emulsion type model could be used to extract information on rheological properties and interfacial tension of polymer blends from known morphology and vice versa.

Effect of compatibilization in situ on PA/SEBS blends

“…The figure shows that PA has two fusion peaks. These two peaks are commonly observed in PA and are assigned to different crystalline forms, i.e., α and γ, as reported in the literature [12] . The peak with the highest TM corresponds to the crystalline structure α, and the lower peak corresponds to the γ crystalline portion.…”

Structure and morphology of an intumescent polypropylene blend

“…The spherical nodules are probably PA-6. 34 This distribution is typical of an uncompatibilized alloy. Moreover, the size distribution of the PA-6 droplets ranges from 5 to 60 m. Some spherulites are visible in the background.…”

Polipropileno/poliamida nahasteen konpatibilizazioa: azterketa morfologiko eta erreologikoa

“…Konpatibilizatzailea gehitzean, tanten tamaina 4 aldiz murrizten da 4. irudian eta 1. taulan ikus daitekeen moduan. Sarreran aipatu bezala, konpatibilizatzaileek tentsio interfaziala murrizten dute kantitate txikienean dagoen fasearen dispertsioa erraztuz [12][13][14]. Nanosilika hidrofobikoaren gehikuntzak tanten tamainaren murrizketa areagotzen du, konpatibilizatzailea duen nahastearekin alderatuta tamaina erdira jaisten delarik.…”