Crystallization of polyamide 11 during injection molding

dc.contributor.authorJariyavidyanont, Katalee
dc.contributor.authorWilliams, Jason L.
dc.contributor.authorRhoades, Alicyn M.
dc.contributor.authorKuehnert, Ines
dc.contributor.authorFocke, Walter Wilhelm
dc.contributor.authorAndrosch, Rene
dc.date.accessioned2018-10-23T09:25:46Z
dc.date.issued2018-07
dc.description.abstractThe semicrystalline morphology of injection moldings of polyamide 11 (PA 11) prepared using mold temperatures of 25, 50, and 80°C was investigated. Regardless of the mold temperature, position‐resolved X‐ray diffraction (XRD) and polarized‐light optical microscopy (POM) revealed presence of poor/imperfect α‐crystals with an almost hexagonal arrangement of molecular stems in a nonspherulitic superstructure in the skin, and formation of α‐crystals and spherulites in the core. With increasing mold temperature, the thickness of the skin layer decreased, and the perfection of α‐crystals and the spherulite size in the core increased. The experimental observations are discussed in terms of predicted crystallization temperatures, with the prediction based on cooling‐rate simulations for the various parts of the injection moldings using Moldflow® and analysis of crystallization of the relaxed melt using fast scanning chip calorimetry, XRD, and POM. It is shown that the structure gradient in PA 11 injection moldings can be forecast without considering the effects of shear for this particular polymer.en_ZA
dc.description.departmentChemical Engineeringen_ZA
dc.description.embargo2019-07-01
dc.description.librarianhj2018en_ZA
dc.description.sponsorshipDeutsche Forschungsgemeinschaft (DFG); contract grant number: AN 212/18.en_ZA
dc.description.urihttps://onlinelibrary.wiley.com/journal/15482634en_ZA
dc.identifier.citationJariyavidyanont, K., Williams, J.L., Rhoades, A.M. et al. 2018, 'Crystallization of polyamide 11 during injection molding', Polymer Engineering and Science, vol. 58, no. 7, pp. 1053-1061.en_ZA
dc.identifier.issn0032-3888 (print)
dc.identifier.issn1548-2634) (online)
dc.identifier.other10.1002/pen.24665
dc.identifier.urihttp://hdl.handle.net/2263/67034
dc.language.isoenen_ZA
dc.publisherWileyen_ZA
dc.rights© 2018 Society of Plastics Engineers . This is the pre-peer reviewed version of the following article : 'Crystallization of polyamide 11 during injection molding', Polymer Engineering and Science, vol. 58, no. 7, pp. 1053-1061, 2018. doi : 10.1002/pen.24665. Polymer Engineering and Science has been published in final form at: https://onlinelibrary.wiley.com/journal/15482634.en_ZA
dc.subjectPolyamide 11 (PA 11)en_ZA
dc.subjectX‐ray diffraction (XRD)en_ZA
dc.subjectPolarized‐light optical microscopy (POM)en_ZA
dc.subjectSkin/core morphologyen_ZA
dc.subjectReorganizationen_ZA
dc.subjectPolymorphismen_ZA
dc.subjectBehavioren_ZA
dc.subjectTemperatureen_ZA
dc.subjectTransitionen_ZA
dc.subjectScanning calorimetry (DSC)en_ZA
dc.titleCrystallization of polyamide 11 during injection moldingen_ZA
dc.typePostprint Articleen_ZA

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