Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Influence of coalescence and interfacial tension on the morphology of PP/HDPE compatibilized blends

2002; Elsevier BV; Volume: 43; Issue: 14 Linguagem: Inglês

10.1016/s0032-3861(02)00223-9

1873-2291

Adriana Martinelli Catelli de Souza, Nicole R. Demarquette,

Polymer Nanocomposites and Properties

In this paper, the compatibilization of polypropylene (PP)/high-density polyethylene (HDPE) blend was studied through morphological and interfacial tension analysis. Three types of compatibilizers were tested: ethylene–propylene–diene copolymer (EPDM), ethylene–vinylacetate copolymer (EVA) and styrene–ethylene/butylene–styrene triblock copolymer (SEBS). The morphology of the blends was studied by scanning electron microscopy. The interfacial tension between the components of the blends was evaluated using small amplitude oscillatory shear analysis. Emulsion curves relating the average radius of the dispersed phase and the interfacial tension to the compatibilizer concentration added to the blend were obtained. It was shown that EPDM was more efficient as an emulsifier for PP/HDPE blend than EVA or SEBS. The relative role of interfacial tension reduction and coalescence reduction to particle size reduction was also addressed. It was observed that the role of coalescence reduction is small, mainly for PP/HDPE (90/10) blends compatibilized by EPDM, EVA or SEBS. The results indicated that the role of coalescence reduction to particle size reduction is lower for blends for which interfacial tension between its components is low at compatibilizer saturation.