Conductive polyethylene-carbon black composites by elongational-flow injection molding Part 3. Study of the structure and morphology |
| |
Authors: | J Martinez Salazar R K Bayer T A Ezquerra F J Baltá Calleja |
| |
Institution: | (1) Present address: Instituto de Estructura de la Materia, CSIC, Madrid, Spain |
| |
Abstract: | The morphology and structure of high molecular weight linear polyethylene (M
w 450000) filled with carbon black and processed using molds that introduce an elongational flow component during injection molding has been examined using electron microscopy and x-ray diffraction techniques. The study of fracture surfaces reveals the display of shish-kebabs oriented along the injection direction with segregated longitudinal channels of carbon black particles. Molecular and lamellar changes in orientation are, furthermore, studied across the thickness of the moldings. It is shown that addition of carbon black particles to injection-molded polyethylene induces significant changes in lamellar orientation. Thus, while lamellar overgrowth proceeds perpendicular to the fiber axes within carbon free channels, lamellae grow randomly within carbon-enriched regions where flow is less pronounced. |
| |
Keywords: | Polyethylene-carbon black composities injection-molding electron microscopy small angle x-rax diffraction morphology |
本文献已被 SpringerLink 等数据库收录! |