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Site‐resolved X‐ray scattering studies, II the morphology in injection‐molded PP foams
Author(s) -
Zipper Peter,
Djoumaliisky Strashimir
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200205)181:1<421::aid-masy421>3.0.co;2-6
Subject(s) - materials science , cylinder , molding (decorative) , composite material , scattering , cross section (physics) , intensity (physics) , texture (cosmology) , morphology (biology) , small angle x ray scattering , mold , wide angle x ray scattering , orientation (vector space) , optics , geometry , small angle neutron scattering , physics , neutron scattering , mathematics , image (mathematics) , quantum mechanics , artificial intelligence , biology , computer science , genetics
PP‐structural foam moldings, composed of three co‐axial cylinders were produced on an on‐line injection molding machine in a pre‐pressurized mold cavity by the classical low‐pressure process and an alternative low‐pressure process. Melt temperature, injection direction and sprue diameter were varied. Cross‐sections cut from the middle of the small cylinder in longitudinal orientation were investigated by site‐resolved X‐ray scattering techniques in three different experiments: (i) wide‐angle scans of the cross‐sections, resulting in two‐dimensional intensity maps; (ii) measurements of azimuthal intensity distributions of the principal PP reflections, for selected positions in the cross‐sections; (iii) again for selected positions, small‐angle measurements interpreted in terms of long periods. The comparison of the results derived from the different samples in the different experiments allows far‐reaching statements about the influence of melt temperature, sprue dimension and position, and the type of process on the morphology and texture in the smallest cylinder of the moldings.