The crystallization morphology evolution of polyoxymethylene/poly(ethylene oxide) blend micropart prepared under microinjection molding conditions

摘要: This article is the first study on microinjection molding and effects of microprocessing parameters crystallization orientation polyoxymethylene/poly(ethylene oxide) (POM/PEO) blend, which has better toughness self-lubricity compared with neat POM therefore a candidate material for making microparts like microgears higher performances. The crystalline phase morphologies were investigated by polarized light microscope (PLM), differential scanning calorimeter (DSC) electron (SEM). was evaluated two-dimensional wide-angle X-ray diffraction (2D-WAXD) Herman's function. experimental results showed that both POM/PEO prepared exhibited three distinct layers, i.e., skin layer, shear layer core while latter had thicker but thinner layer. PEO well dispersed in matrix. spherulite size, melting point as crystallinity blend decreased due to interference POM. A shish-kebab structure observed layers microparts. processing thicknesses different investigated. With increase injection speed or decrease mold temperature, became thicker, oriented region thinner. However, influence pressure not obvious. Also, affected function f decreased, indicating lower degree orientation. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40538.