Morphology development in the gate region of microinjection-molded thermoplastics

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DOIResolve DOI: http://doi.org/10.1002/pen.22143
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TypeArticle
Journal titlePolymer Engineering and Science
Volume52
Issue4
Pages787794; # of pages: 8
AbstractThe 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
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number54391
NPARC number19366504
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Record identifier649ee02c-42a0-4bfd-b3de-600d12d2f9b2
Record created2012-02-02
Record modified2016-05-09
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