Abstract This work aims to evaluate the performance of glass/sisal hybrid composites focusing on mechanical (flexural and impact) dynamic analyses (DMTA). Hybrid with different fiber loadings volume ratios between glass sisal were studied. The effect length has also been investigated. densities compared theoretical values, showing agreement rule mixtures. results obtained in flexural impact analysis revealed that, general, properties always higher for overall reinforcement content. By DMTA,...

Degradation and stabilization of pristine polypropylene (PP) have been extensively studied especially from the 1980s until first years 21st century. As a result increasing importance recycling PP, its degradation became again relevant. Differently virgin grades, post-consumer PP presents distinct chemical moieties formed due to degradation, affecting thermo-oxidative stability. To support studies on mechanical this review an outline reactions leading PP's mechanisms action most relevant...

Polyethylene (PE) and polypropylene (PP) are among the most recycled polymers. However, these polymers present similar physicochemical characteristics cross-contamination between them is commonly observed, affecting quality of recyclates. With increasing demand for plastics, understanding composition materials crucial. Numerous techniques have been introduced in literature to determine plastics. An ideal technique should be accessible, cost-efficient, fast, accurate. Differential Scanning...

Low-density polyethylene (LDPE), extensively employed in flexible plastic packaging, often undergoes printing with inks. However, during the mechanical recycling of post-consumer waste, these inks act as contaminants, subsequently compromising quality and usability recycled material. To understand better exactly which ink components cause effects, this study comprehensively assesses thermal behavior three organic pigments two commonly utilised binders, correlated impact on LDPE-based...

Based on differential scanning calorimetry (DSC), X-ray diffraction (XRD) analysis, polarizing microscope (POM), and electron microscopy (SEM) strategies to close the gap applying conventional processing optimizations for field of 3D printing specifically increase mechanical performance extrusion-based additive manufacturing poly(lactic acid) (PLA) filaments by annealing and/or blending with poly(3-hydroxybutyrate) (PHB) were reported. For filament at 210 °C, PLA crystallinity increased...

One of the challenges for single-screw micro-extrusion or additive manufacturing (AM), thus 3D printing, polymers is controlling melting efficiency so that energy and equipment costs can be minimized. Here, a numerical model presented AM process design, selecting acrylonitrile–butadiene–styrene (ABS) as viscoelastic reference polymer. It demonstrated different compared to conventional due variation in extrusion dimensions, leading balance heating by conduction viscous heat dissipation caused...

The (re-)processing and degradation behavior of polypropylene (PP) blends with high-density polyethylene (HDPE) is a crucial topic in mechanical recycling due to the prevalence PP/HDPE mixtures. In particular, small amounts cross-contamination (below 10.0 wt.%) between these polyolefins are quite common. While much empirical data available, systematic studies on such scarce rarely account for polymers' chain structure. This study employs time-resolved rheology, atomic force microscopy (AFM),...

Abstract More recently pellet‐based additive manufacturing or so‐called micro‐extrusion has become more popular for final polymeric part production. In the present work, it is evaluated how AM (PBAM) performs its extrudates and specimens compared to established fused filament fabrication technique, considering both commercial acrylonitrile butadiene styrene polymer poly(lactic acid) pellets filaments as feedstocks. For benchmarking purposes, a comparison with conventional techniques, that...

Abstract Vulcanized rubbers are materials commonly used in various industrial applications. In this study, scraps of ethylene‐propylene‐diene rubber (EPDM‐r) from the automotive industry were submitted to different microwave exposure times (2–5 min). Samples recycled with (as received) and without (after extraction) paraffinic oil analyzed. The devulcanized EPDM‐r was characterized by gel content, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA). content indicated...

Commercially mass-polymerized acrylonitrile-butadiene-styrene (ABS) polymers, pristine or modified by stabilization systems, have been injection molded and repeatedly exposed to ultravilolet A (UVA) radiation, mechanical recycling, extra molding steps study the impact of such treatments on physicochemical, mechanical, colorimetric, thermal-oxidative characteristics. The work focus mimicking effect solar radiation behind a window glass as relevant during lifetime ABS polymers incorporated in...

In this study, thermoplastic polyurethanes (TPUs) were synthesized using the one-shot process in solution. To obtain samples n-phenylaminopropyl polyhedric oligomeric silsesquioxane (POSS) was added as a chain modifier during synthesis four different amounts. The characterized by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and capillary rheometry. FTIR confirm TPU attainment due absence of band at ~2253 cm-1 suggesting complete...

The copolymer ethylene vinyl acetate (EVA) and blends of EVA ground tire rubber (GTR) with different compositions are prepared in the presence absence dicumyl peroxide (DCP) as a crosslinking agent. kinetics is investigated through oscillatory disc rheometry (ODR) differential scanning calorimetry (DSC). found to be dependent on amount GTR EVA/GTR blends; partially crosslinked phase acts physical barrier, slowing down rate. Furthermore, activation energies (E ) reaction order (n) values...

In the present work, statistical analysis (16 processing conditions and 2 virgin unmodified samples) is performed to study influence of antioxidants (AOs) during acrylonitrile-butadiene-styrene terpolymer (ABS) melt-blending (220 °C) on degradation polybutadiene (PB) rich phase, oxidation onset temperature (OOT), peak (OP), yellowing index (YI). Predictive equations are constructed, with a focus three commercial AOs (two primary: Irganox 1076 245; one secondary: Irgafos 168) two ABS types...

To improve the product quality of polymeric parts realized through extrusion-based additive manufacturing (EAM) utilizing pellets, a good control melting is required. In present work, we demonstrate strength previously developed melt removal using drag framework to support such improvement. This model, downscaled from conventional extrusion, successfully validated for pellet-based EAM-hence, micro-extrusion-employing three material types with different measured rheological behavior, i.e.,...

Additive manufacturing (AM) of polymeric materials offers many benefits, from rapid prototyping to the production end-use material parts. Powder bed fusion (PBF), more specifically selective laser sintering (SLS), is a very promising AM technology. However, up until now, most SLS research has been directed toward polyamide powders. In addition, only basic models have put forward that are less identification suited operating conditions in sustainable context. present combined experimental and...

ABSTRACT In this work, a maleinized soybean oil (SOMA) was melt reacted with polyamide 6 and the thermal, rheological, morphological properties were evaluated. It observed that chains, increasing molecular weight of polymer. Addition SOMA also promoted an increase in amount α crystalline phase as well crystallinity index. The average amorphous layer thickness ( L ) enhanced addition 1 wt % SOMA, while c significantly enlarged content, indicating structures located at interfacial region...

Elastômeros vulcanizados são materiais comumente empregados em diversas aplicações, como nas indústrias automotiva e calçadista. Neste trabalho, aparas do terpolímero de etileno-propileno-dieno (EPDM-r) provenientes da indústria foram submetidas a micro-ondas durante diferentes tempos exposição (2-5 min). Após desvulcanização, as amostras caracterizadas por teor gel, calorimetria exploratória diferencial (DSC) energias ativação degradação (Ea) determinadas análise termogravimétrica (TGA). O...