Resumo

MORALES, P.C  e  SALAZAR, R.A. FENÓMENO DE INMISCIBILIDAD EN PELÍCULAS DE POLIETILENO RAMIFICADO DE BAJA DENSIDAD, PEED, EN PROCESOS DE EXTRUSIÓN DE PELÍCULA SOPLADA. C.T.F Cienc. Tecnol. Futuro [online]. 2000, vol.2, n.1, pp.111-128. ISSN 0122-5383.

The immiscibility in branched low-density polyethylene film was researched using techniques of instrumental analysis (FTIR, DRX, DSC, TGA, SEC-GPC, SEM-EDX) and rheometry (DMA, Capillary Rheomether). It was determined that immiscibility occurs when there are microentities generated by an undesirable polymer found in a low proportion in the mixture, characterized by different morphological and rheological properties regarding the LDPE prime, which makes up the plastic film. It was found that the LDPE polymer which forms the "fish-eyes" microentities has a wider distribution of molecular weights, low cristallinity, greater branching and a rheological behavior unlike the LDPE prime, causing this phenomenon in the extrusion process of the blown film. This is considered a significant defect in the quality of plastic film used for general-purpose packing.

Palavras-chave : immiscibility; LDPE; extrusion; fish eyes; "gels"; prime.

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