Study of the Technical Feasibility of the Use of Polypropylene Residue in Composites for Automotive Industry

Abstract

Polypropylene (PP) is widely used in short-term use artifacts, rapidly discarded and should partially replace neat PP. In addition, it is one of the polymers most used in the automobile industry. This study shows the technical feasibility of partially substituting neat PP for a post-consumer counterpart (PP r), as well as adding ground glass (GP), used as filler in the polymer matrix. Mechanical and thermal properties of the recycled blends (PP/PP r) and composites (PP/PP r /GP) were evaluated. The results demonstrated that the blend with the highest PP r content obtained a statistically significant decline in elastic modulus, but adding 5 wt% of GP to this blend increased this property, achieving a similar value in relation to neat PP. The composite developed may be a promising tailor-made product with properties resembling those of the virgin plastic. Thus, the automotive industry seems to be a good option for the use of PP r and GP composites and blends, without increasing product requirements.

Bottlenecks in biobased approaches to plastic degradation

“…Plastic is not infinitely recyclable through traditional means. The temperature and processing during mechanical recycling can result in degraded polymer and material properties which limits the number of times a plastic can be mechanically recycled [82][83][84][85][86] . The number of times a plastic can be mechanically recycled is also drastically impacted by the initial feedstock, the addition of chemical additives, processing temperature, and blending different polymer types together.…”

The Influence of Friction and Twisting Angle on the Tensile Strength of Polypropylene Baling Twine

“…PP is a recyclable and reusable material, so its life cycle does not end with producing a final product [1,2]. When subjected to tension, recycled PP exhibits similar mechanical characteristics (elastic limit and elastic modulus) as transparent virgin PP, and therefore, it can be used as widely as any non-recycled material, and even has certain advantages such as lower cost and a contribution to environmental protection [3][4][5].…”

Isolation and In Vitro Biological Evaluation of Triterpenes from Salacia grandifolia Leaves

“…5 These activities include antitumoral effects (e.g., tingenone and pristimerin), anti-inflammatory properties (e.g., celastrol), antimicrobial activity (e.g., 1α,29-dihydroxyfriedelan-3-one), cardioprotective effects (e.g., lupeol, 2α-hydroxyursolic acid), antidiabetic activity (e.g., α-amyrin), and antiviral effects (e.g., betulinic acid, oleanolic acid, and ursolic acid). 2,3,5−9 In the present work, the phytochemical study of the hexane extract of S. grandifolia leaves led to the isolation of the new triterpene 28-hydroxyfriedelane-3,15-dione (1), along with seven known triterpenes: friedelan-3-one (2), friedelan-3β-ol (3), friedelane-3,15-dione (4), 15α-hydroxyfriedelan-3-one (5), 28-hydroxyfriedelan-3-one (6), 30-hydroxyfriedelan-3one (7), and 29-hydroxyfriedelan-3-one (8) (Figure 1). The structural elucidation of the new triterpene 1 was established by the analysis of infrared (IR), 1 H and 13 the hexane (EH), chloroform (EC), and ethyl acetate (EAE) extracts, was evaluated against the mouse hepatitis virus 3 (MHV-3), a murine coronavirus that mimics the debilitating conditions of SARS-CoV-2 infections in vivo.…”