Effect of Quinacridone Pigments on Properties and Morphology of Injection Molded Isotactic Polypropylene

Mateusz Barczewski,Bartłomiej Hoffmann,Danuta Matykiewicz

doi:10.1155/2017/7043297

Mateusz Barczewski, Bartłomiej Hoffmann + Show 1 more

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https://doi.org/10.1155/2017/7043297

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Abstract

Two quinacridone pigments were added (0.01; 0.05; 0.1; 0.5; 1; 2 wt%) to isotactic polypropylene (iPP), and their influence on mechanical and thermomechanical properties were investigated. Complex mechanical and thermomechanical iPP properties analyses, including static tensile test, Dynstat impact resistance measurement, and hardness test, as well as dynamic mechanic thermal analysis (DMTA), were realized in reference to morphological changes of polymeric materials. In order to understand the differences in modification efficiency and changes in polymorphism of polypropylene matrix caused by incorporation of pigments, differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) experiments were done. Both pigments acted as highly effective nucleating agents that influence morphology and mechanical properties of isotactic polypropylene injection molded samples. Differences between polypropylene samples nucleated by two pigments may be attributed to different heterogeneous nucleation behavior dependent on pigment type. As it was proved by WAXS investigations, the addition of γ-quinacridone (E5B) led to crystallization of polypropylene in hexagonal phase (β-iPP), while for β-quinacridone (ER 02) modified polypropylene no evidence of iPP β-phase was observed.

Highlights

Due to the nature of thermoplastic polymers, incorporation of additives, such as pigments or fillers, results in changes in polymeric matrix properties and structure
In order to understand the differences in modification efficiency and changes in polymorphism of polypropylene matrix caused by incorporation of pigments, differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) experiments were done
Isotactic polypropylene is a typical commercially used structural polymer, often applied in injection molding processing and susceptible to heterogeneous nucleation [1,2,3,4,5,6,7,8,9,10,11]. isotactic polypropylene (iPP) can crystallize into different crystalline structures, such as α, β, or γ, depending on microstructural features and crystallization conditions as well as use of specially designed nucleating agents (NAs) [1, 7, 12,13,14,15,16,17]

Summary

Introduction

Due to the nature of thermoplastic polymers, incorporation of additives, such as pigments or fillers, results in changes in polymeric matrix properties and structure. Most of the additives may act as nucleating agents and lead to heterogeneous nucleation effect which in turn causes changes in polymer structure. They are additives which provide additional nuclei that accelerate crystallization process and promote nucleation together with crystal growth [7, 8]. Quinacridone, namely, the 5,12-dihydroquino[2,3b]acridine-7,14-dione (C20H12N2O2), is the pigment most frequently used for creating red-violet shades. Both high photo and thermal stability effect their wide application

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