Mechanical properties of polypropylene filled with calcium carbonate

Abstract

SUMMARYCalcium carbonate of various particle shape (CaCO,, sphere, cube, needle) treated with alkyl dihydrogen phosphate ester (APEN, CnH2n+10PO(OH)2, n = 1, 4, 8, 10, 12) and poly(propy1ene) (PP) were mixed on a two roll mill. The effect of carbon number of APEN on the mechanical properties (tensile elongation, tensile strength, impact strength, yield stress) and adhesion between PP matrix and various CaC03 particles and the effect of CaC0, shape on the storage modulus of elongated PP/ CaCO, has been investigated.The tensile elongation, impact strength and adhesion of PP-CaC0, interface increased with carbon number of APEN (n s 10) for needle and cube type, but the dependence of tensile properties on APEN carbon number is not clearly recognized for the sphere type. The relative storage moduli of elongated PP/CaC03, EZ/E? (EZ -modulus of elongated PP/CaC03 (untreated); Ef -modulus of elongated PP matrix could sufficiently be described with a modified Halpin-Tsai equation, which contains the factors of (i) polymer matrix orientation, (ii) particle effect (content, modulus, aspect ratio), and (iii) void volume at polymer-filler particle interface. ZUS AMMENFASSUNG:Mit Alkyldihydrogenphosphaten behandeltes Calciumcarbonat unterschiedlicher Teilchenform (sph%risch, kubisch, Nadeln) wurde als Fullstoff fur Polypropylen (PP) verwendet. Der Einflulj der Kettenlange der Alkylgruppe auf mechanische Eigenschaften (Zugdehnung, Zugfestigkeit, Schlagzugfestigkeit, Streckspannung) und die Adhasion zwischen der PP-Matrix und den verschiedenen CaC03-Teilchen wurde untersucht, ebenso der Einflulj der Teilchenform auf den Speichermodul des rnit unbehandeltem CaCO, gefullten und verstreckten PP.Zugdehnung, Schlagzugfestigkeit und Adhasion des mit kubischem bzw. nadelformigem CaCO, gefullten PP nehmen rnit steigender Kettenlange der Phosphat-Alkylgruppe zu, wahrend das mit sphtirischem CaC0, gefullte PP keine einheitliche Tendenz zeigt.Die relativen Moduli EZ/Ef (E: -Speichermodul der verstreckten Komposite; E: -Speichermodul der ungefullten verstreckten PP-Matrix) der verstreckten PP/CaC03-Komposite lassen sich rnit einer modifizierten Halpin-Tsai-Gleichung beschreiben,

Effect of flexibility of ethylene vinyl acetate and crystallization of polypropylene on the mechanical properties of i‐PP/EVA blends

“…The data decrease with further increase in U d remaining, however, higher than unity. The variation of the data strengthens the assumptions of the modified Mitsuishi et al model 42 and clearly demonstrates that the EVA copolymer makes the impact i-PP more ductile implying an impact toughening. As crystallinity of the i-PP/EVA blends increased with EVA copolymer content, the impact toughening contribution of the polymer was evaluated from a plot of normalized relative Izod impact strength vs. U d , Figure 9.…”

Mechanical properties of polypropylene/CaCC3 composites

“…The yield and fracture behaviour of CaCO3 filled PIP composites have been reported respectively in literatures . Mitsuishi et al [1]. investigated the effect of strain rate, filler content and filler size upon the elastic modulus and yield stress of PP/CaCO, composites and noted that the elastic modulus and yield stress of an unmodified system were increased with an increase of strain rate and filler content, but the dependence of them on the strain rate and filler content was decreased for the surface-modified filler filled system.…”

Study of dynamically cured PP/MAH‐g‐PP/talc/epoxy composites

“…1 In the last decade, polypropylene (PP) has been found to make interesting matrices for filled materials because of its combination of remarkable properties and low cost. [2][3] Of the fillers for PP, mica, 3-5 calcium carbonate, [2][3]6 and talc 7 are the most often used. Each filler brings its own characteristics to the PP and may also influence the crystallization of the PP and, as a consequence, the properties of the composites.…”