“…However, it can be positioned in the intercrystallite phase and, therefore, the supermolecular structure of polymer disorders, as extensively studied by Danilova Volkovskaya. 27 All these modifications significantly influence the linear density and other physical properties of miPP filaments. Figure 11.Impact of pigment concentration on various physical properties (drawing ratio 1).…”
In this research, metallocene catalyst isotactic polypropylene (miPP) filaments were produced with different concentrations of photochromic pigments to develop ultraviolet (UV) sensing materials. The produced miPP filaments showed good photochromic response under UV irradiation. In this work, six drawing ratios were applied to get the final product (miPP filament). Resultant filaments showed significant photochromic responses, such as Kubelka–Munk values ( K/ S). The interesting observation was that the photochromic response was indirectly proportional to the applied drawing ratio. The photochromic color build was found to be maximum with the highest concentration of pigment as well as the lowest drawing ratio. Overall, it was observed that the thermal properties were significantly dependent on the drawing ratio. The changes in thermal properties, such as T m, ΔH m and ΔS m, for miPP filaments in dependence on photochromic pigment concentration was significantly less as compared to the drawing ratios. The thermal properties improved with the drawing ratio, which directly influenced the crystallinity of produced miPP filaments. The addition of photochromic pigment to the miPP filaments increased the crystallinity by 14%. Also, the lamella thickness increased with increasing the drawing ratio. However, there was no significant effect of pigment concentration on lamella thickness. In this experimental work, the impact of drawing ratio on the optical, thermal and mechanical properties of photochromic miPP filaments was investigated.
“…However, it can be positioned in the intercrystallite phase and, therefore, the supermolecular structure of polymer disorders, as extensively studied by Danilova Volkovskaya. 27 All these modifications significantly influence the linear density and other physical properties of miPP filaments. Figure 11.Impact of pigment concentration on various physical properties (drawing ratio 1).…”
In this research, metallocene catalyst isotactic polypropylene (miPP) filaments were produced with different concentrations of photochromic pigments to develop ultraviolet (UV) sensing materials. The produced miPP filaments showed good photochromic response under UV irradiation. In this work, six drawing ratios were applied to get the final product (miPP filament). Resultant filaments showed significant photochromic responses, such as Kubelka–Munk values ( K/ S). The interesting observation was that the photochromic response was indirectly proportional to the applied drawing ratio. The photochromic color build was found to be maximum with the highest concentration of pigment as well as the lowest drawing ratio. Overall, it was observed that the thermal properties were significantly dependent on the drawing ratio. The changes in thermal properties, such as T m, ΔH m and ΔS m, for miPP filaments in dependence on photochromic pigment concentration was significantly less as compared to the drawing ratios. The thermal properties improved with the drawing ratio, which directly influenced the crystallinity of produced miPP filaments. The addition of photochromic pigment to the miPP filaments increased the crystallinity by 14%. Also, the lamella thickness increased with increasing the drawing ratio. However, there was no significant effect of pigment concentration on lamella thickness. In this experimental work, the impact of drawing ratio on the optical, thermal and mechanical properties of photochromic miPP filaments was investigated.
“…From earlier studies and production experience it was concluded that preferable values of strength of a thread with a linear density of 800 tex (800 g/100 m) lie in the range 38-43 MPa, and preferable values of breaking elongation in the range 8-11% [2]. Such a level of strength values will not lead to failure of the tensioning elements of circular weaving machines, while elongation will prevent longitudinal folds of the thread in sleeve fabric and its breakage.…”
mentioning
confidence: 99%
“…In order to increase the strength without adversely affecting the elastic properties with a prescribed width of the thread and lower values of linear density, modifying additives were introduced. The choice of additives was governed by the results of earlier studies in which the promise of their application was demonstrated [2,3].…”
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