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Morphology development in the gate region of microinjection‐molded thermoplastics
Author(s) -
Chu JingSong,
Kamal Musa R.,
Derdouri Abdessalem,
Hrymak Andy
Publication year - 2012
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.22143
Subject(s) - polyoxymethylene , materials science , polarized light microscopy , differential scanning calorimetry , composite material , molding (decorative) , microinjection , optical microscope , scanning electron microscope , morphology (biology) , polyethylene , shear (geology) , polymer , optics , medicine , thermodynamics , endocrinology , physics , genetics , biology
The melt experiences extremely high shear rates as it travels through the very small gate, in the microinjection molding process. The combination of the high shear rates, extensive viscous heating, and the large thermal gradients has a profound influence on the characteristics of the moldings. However, many of these interactions are not clearly understood. In this study, the morphology of moldings in the gate region was observed using a polarized light microscope. Moreover, the specimens from different regions of micromoldings were analyzed using a differential scanning calorimeter (DSC). Two materials were selected for the study: polyoxymethylene (POM) and high‐density polyethylene. Three special morphological features were observed in the gate region for POM but not for polyethylene. The results obtained using the DSC were explained in light of the microstructural features observed using polarized light microscopy. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers