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      Flow and Thermal History Effects on Morphology and Tensile Behavior of Poly(oxymethylene) Micro Injection Molded Parts

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          Abstract

          The micro injection molding process is a rapidly growing area in plastics processing technology. In this process, the polymer is exposed to both high shear rates and large thermal gradients. In view of the versatility of the process, both commodity and engineering polymers have been used in micro injection molded products. In the present work, poly(oxymethylene) (POM), a partially crystalline engineering polymer, was employed to evaluate the relationships between processing conditions, on one hand, and the morphology and properties of the final part, on the other hand. An unsymmetrical mold cavity to make parts in the form of stepped plaques was used in the study. This resulted in substantial differences in morphology, crystallinity and shrinkage of the zones of different constant thicknesses in the micro parts. Depending on the molding conditions and the location on the micro-part, the microstructure can display up to five crystalline layers. Of particular interest, shish-kebab crystalline structures were observed within the skin of the step with the smallest thickness. Differential scanning calorimetry (DSC) tests are used to distinguish between the melting points of the shish and kebab components of this particular structure. The degree of crystallinity as determined by wide angle X-ray diffraction (WAXD) and shrinkage across the thickness were also found to be highest in the step with the smallest thickness.

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          Oriented crystallization in polymers

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            The skin-core morphology and structure–property relationships in injection-molded polypropylene

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              Structure Development during Shear Flow-Induced Crystallization of i-PP:  In-Situ Small-Angle X-ray Scattering Study

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                17 November 2017
                : 32
                : 5
                : 590-605
                Affiliations
                1 Department of Chemical Engineering and CREPEC, McGill University, Montreal, QC, Canada
                2 Université Chouaib Doukkali d'El Jadida, El Jadida, Morocco
                3 National Research Council Canada, AST, Boucherville, QC, Canada
                4 Micromolding Solutions Inc., Brossard, QC, Canada
                Author notes
                [* ] Correspondence address, Mail address: Musa R. Kamal, Department of Chemical Engineering and CREPEC, McGill University, Wong Building, 3610 University Street, Montreal, H3A 2B2, QC, Canada, E-mail: musa.kamal@ 123456mcgill.ca
                Article
                IPP3472
                10.3139/217.3472
                © 2017, Carl Hanser Verlag, Munich
                Page count
                References: 51, Pages: 16
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Special Issue Contributions

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