Development of density distributions in injection molded amorphous engineering plastics. Part II

Jeong S. Yu, Dilhan M. Kalyon

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The experimental results obtained on the gapwise density distributions of freely quenched and injection molded specimens of two engineering thermoplastics presented in Part I of this paper were compared with simulation results. The effect of the thermal history on the density development in the freely quenched samples was investigated by employing the fictive temperature concept in conjunction with the experimentally determined material characteristics. The density distribution in freely quenched specimens of poly(ether imide) could be readily predicted. The combined effects of the cooling rate and the pressure history on the density distributions of injection molded samples were also investigated. A phenomenological model was developed to combine the effects of thermal and pressure history on the density distribution. Overall, the predicted results for injection molded specimens agreed well with the experimental results.

Original languageEnglish
Pages (from-to)153-160
Number of pages8
JournalPolymer Engineering and Science
Volume31
Issue number3
DOIs
StatePublished - Feb 1991

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