Flow Induced Crystallization of Poly(ether-block-amide) from the Microinjection Molding Process and its Effect on Mechanical Properties

Nan Zhang, Seong Ying Choi, Michael D. Gilchrist

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Crystallization during microinjection molding is investigated relative to process conditions. Modulus and hardness of the skin layer are higher than the core layer, regardless of core structure. Young's modulus, strain at break and yield stress all increase with an increase of skin ratio. The relationship between process, morphology and mechanical properties is studied for micro products. By using in-line process monitoring, flow induced crystallization is characterized by shear stress and apparent specific work. Shear stress is shown to be a good candidate to characterize the formation of highly oriented structures under actual microinjection molding processes. This may provide a method for in-line control of morphology development, and then final properties, by controlling the flow conditions.
Original languageEnglish
Pages (from-to)1362-1383
JournalMacromolecular Materials and Engineering
Volume299
Issue number11
Early online date08 Jul 2014
DOIs
Publication statusPublished - Nov 2014

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