A Study of the Effect of the Quinacridone Pigment Content and Storage Time on the Process of Crystallization of Pre-oriented Polypropylene/Quinacridone Fibres

The quinacridone pigment family presents a broad group of organic pigments commonly employed for various colourant applications. Furthermore, they are also acting as high-effective nucleating agents with a significant effect on the process of crystallization of polyolefins and thus affecting most of their physical properties. The presented work is focused on the practically uninvestigated field of research of the effect of storage time on the crystallization of pre-oriented polypropylene fibres with different content of the quinacridone pigment, intended for textiles for niche applications. Based on the results of the analysis of differential scanning calorimetry, performed in the time period of 35 days from the date of manufacture of fibres with a periodicity of 7 days, the dependence of their crystallinity, crystallization and melting temperature on the storage time as well as on the quinacridone content were studied. High-reliable predictive models of these dependencies, suitable for practical application in the textile industry, were created.