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Restructuring of confined crystalline morphology in the drawing process of VGCF-iPP nanocomposite filaments
Ist Teil von
Polymer (Guilford), 2018-10, Vol.154, p.218-224
Ort / Verlag
Kidlington: Elsevier Ltd
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Solid-state drawing to high extension ratios of melt-extruded VGCF-iPP nanocomposite filaments results in remarkable increases in modulus and strength, which mask any contribution of nano-reinforcement or inter-particle confinement observed previously. Based on X-ray diffraction and thermal analyses it is shown that the drawing process involves crumpling of the original 'shish-kebab' structure, accompanied by lateral shrinkage of the 'kebabs', disappearance and reorientation of daughter lamellae and significant increases in the degree of crystallinity by solid-state recrystallization. The effects of the initial diameter of the as-extruded filaments and those of the nanofibers and the 'shish-kebab' structure are dominated by the drawing process, which produces a highly aligned fibrillar structure with superior mechanical properties. A cartoon model of the effect of solid-state drawing of extruded iPP and nanocomposite filaments on the transition from 'shish-kebab' to fibril morphology is presented.
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•Drawing of VGCF-iPP nanocomposite filaments generates high mechanical properties.•Drawing induces solid-state recrystallization by crumpling of 'shish-kebab' structure.•Shrinkage of 'kebabs' and reorientation of daughter lamellae increase crystallinity.•Effects of confinement and nanoreinforcement are dominated by a fibrillar structure.