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Effect of lanthanum‐modified magnesium silicate on isotactic polypropylene crystallization in composite materials during shear flow
Author(s) -
Bednarek Wojciech H.,
Ciesielczyk Filip,
Odalanowska Majka,
Paukszta Dominik,
Piasecki Adam
Publication year - 2020
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25422
Subject(s) - materials science , crystallization , tacticity , composite material , composite number , nucleation , polypropylene , magnesium , shearing (physics) , filler (materials) , shear rate , chemical engineering , rheology , metallurgy , polymerization , polymer , chemistry , organic chemistry , engineering
The activity of isotactic polypropylene (iPP) nucleating additives during shear flow of composite materials is still not entirely explained. In current work the sol‐gel method was employed to synthesize MgO·SiO 2 filler, surface‐modified with trivalent lanthanum. The crystallization of commercial iPP in the presence of 0.5% by weight La 3+ modified or unmodified silicates was analyzed. The wide angle X‐ray scattering analysis proved that the presence of even small amount of filler influences significantly on supermolecular structure of iPP. The results of microscope observations confirmed that the lanthanum‐modified filler shows the nucleating ability for iPP. In that case a significant reduction of crystallization induction time was noticed. The investigation of iPP crystallization in composites after shear treatment confirmed that the increase of shear rate reduces the nucleating ability of additives. Moreover, the flow of filler particles during shearing may impede the shear‐induced crystallization phenomenon.