Approach (surface response analysis). The impact of additives, aside from the filler, but common in industrial applications, such as an antioxidant and also a common compatibilizer, was investigated. The drawing ratio, the filler, along with the compatibilizer or the antioxidant content material have been selected as design and style variables, whereas the tensile strength along with the onset decomposition temperature were set as response variables. Fibers with really high tensile strength (up to 806 MPa) were obtained. The outcomes revealed that the maximization of each the tensile strength and the thermal stability was not feasible for composites with talc on account of multiple interactions amongst the utilized additives (antioxidant, compatibilizer, and filler). Also, it was found that the addition of talc within the studied particle size enhanced the mechanical strength of fibers only if low drawing ratios have been used. Alternatively, the optimization targeting maximization of both tensile strength and thermal stability was feasible within the case of SWCNT composite fibers. It was discovered that the addition of carbon nanotubes enhanced the tensile strength; on the other hand, such improvement was rather smaller compared using the tremendous boost of tensile strength because of drawing. Keyword phrases: drawn polymer fibers; polymer composites; polypropylene; talc; carbon nanotubesReceived: 28 February 2022 Accepted: 22 March 2022 Published: 25 March 2022 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.1. Introduction Polypropylene (PP) and polyethylene would be the most popular thermoplastics.IL-1beta Protein supplier PP’s chemical inertia, mechanical strength, low electric and thermal conductivity, high melting point, and quick processing render it as a very vital polymeric material for any wide variety of applications. In most applications, PP is utilised either in the form of films/sheets or within the form of fibers. Films and sheets are mostly utilized as packaging supplies, while fibers are mainly applied in textiles. Other applications include things like automotive and healthcare solutions industry. The COVID-19 pandemic outbreak further revealed the industrial significance of PP-based supplies, exactly where the enhanced will need for disposable PP non-woven fabrics for gowns, face masks, and shoe covers has appeared [1].UBE2D3 Protein supplier Consequently, the improvement of each mechanical and thermal properties of PP based materials is usually a investigation location of continuous interest.PMID:24406011 Regarding PP fibers, it is extensively known that a significant increase of mechanical strength could be accomplished by drawing, beneath appropriate situations (e.g., appropriateCopyright: 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access short article distributed below the terms and conditions on the Creative Commons Attribution (CC BY) license ( 4.0/).Polymers 2022, 14, 1329. 2022, 14,2 ofdrawing ratio and temperature) as a result of alignment of macromolecular chains inside the drawing axis direction [22]. As an example, the use of a drawing ratio equal to 7 can substantially increase the PP fiber’s tensile strength from around 300 MPa to around 40000 MPa [11,12]. Besides macromolecules, it has been observed that low molecular weight needle-like fillers also align through drawing, which final results inside a a lot more effective and uniform transfer of mechanical stresses from the polymer for the filler [5,6,13,14]. Fillers are extensively utilised in order to alter various prop.