A study on the thermodynamic changes in the mixture of polypropylene (PP) with varying contents of technological and post-user recyclates for sustainable nanocomposites

Abstract

VK, A study on the thermodynamic changes in the mixture of polypropylene (PP) with varying contents of technological and post-user recyclates for sustainable nanocomposites, Vacuum (2017),

Effect of Styrene-Diene Block Copolymers and Glass Bubbles on the Post-Consumer Recycled Polypropylene Properties

“…The lower melting peak is attributed to the melting of the high-density polyethylene (PEHD) contamination component, whereas at higher temperature it is assigned to the melting process of the polypropylene (PP) component. Other authors also reported a melting peak around 130 • C when carrying out the thermal analysis by DSC for post-consumer recycled PP, and explained this was due to the HDPE presence in packaging films (extrusion technology) [1,34] or as bottle caps (injection-molded PE-HD) [51]. The degree of crystallinity for polyethylene (PE) was calculated based on the standard melting enthalpy corresponding to 100% crystallization of PE (290 J/g) [11].…”

“…Polypropylene (PP) ranks third in the plastic manufacturing field [1], being intensely processed for auto components, fittings, pipes, cables, packaging, electronic items and fibers for concrete reinforcing. Generally, PP shows a low impact, especially at low temperatures, and low strength.…”

“…Usually, up to 50 wt% post-consumer recycled polypropylene is added to virgin polymeric matrix processed by extrusion and injection technologies [23]. However, due to the presence of polyethylene as discontinuous phases in a polypropylene continuous phase [24], the thermal and mechanical properties of post-consumer recovered items are weaker compared to those of unmodified polypropylene [1]. To overcome these limitations, reinforcing agents and compatibilizers have been introduced into the recycled PP matrix during the melt mixing process to manufacture refrigerator plastics [25], 3D printing materials [26], auto components [27], and so forth.…”

Occurrence and recovery of small-sized plastic debris from a Brazilian beach: characterization, recycling, and mechanical analysis

“…In the same way, highimpact PP (Bahlouli et al 2012;Kozderka et al 2016) can also be recovered with appropriate content ratios. Moreover, there is the possibility of including recycled PP on composites (Izzati Zulkifli et al 2015;Michalska-Pożoga et al 2017) thus improving its life cycle. Despite fillers for the manufacturing of composites, by considering other resins such as PE, Pietrelli et al (2017) also suggest the use of plasticizers to improve mechanical properties of microplastic debris.…”

Preparation of Boron Nitride-Coated Carbon Fibers and Synergistic Improvement of Thermal Conductivity in Their Polypropylene-Matrix Composites

“…Moreover, to the best of our knowledge, there have not been any reports on the improvement of thermal conductivity of polymer-matrix composites (PMCs) reinforced with BN-CFs. Polypropylene (PP) was used as the matrix mainly due to its wide commercial availability and good recyclability [33,34]. In this study, to further contribute to the formation of conductive pathways within the matrix, graphite flakes (GFs) were employed as a cost-effective secondary filler, which can lower the percolation threshold of the fillers due to their two-dimensional geometry.…”