The activation energy for nonisothermal cold crystallization of polyethylene terephthalate (PET) and its blends with 1% polystyrene (PS) styrene-acrylonitrile copolymer (SAN) were measured based on differential scanning calorimetry (DSC). Kissinger method was used to compute the energies in all cases, obtaining mean values 120, 100, 85 kJ/mole neat PET, PET/1%PS PET/1%SAN. A modified procedure is proposed estimate polymer systems which relative crystallinity - at constant heating rates can...

Babassu was studied as a vegetable filler in blend consisting of polybutyrate adipate terephthalate and polylactic acid aiming at preparation bio-based biodegradable films by solvent casting. The morphology, thermal, mechanical properties were investigated with optical, thermoanalytical, spectroscopic methods correlated the sample setup. Although only laboratory scale for film production has been applied this work, results suggest that composite PBAT/PLA 10% may be suitable material...

The effect of alcaline and hot water surface treatments piassava Attalea funifera fibers was investigated. efficiency each treatment evaluated by Fourier transform infrared spectroscopy, X-ray diffractometry, optical microscopy, scanning electron microscopy atomic force microscopy. alkaline were effective in removing the superficial lignin layer from fiber, while not. Treatment with NaOH caused fiber defibrillation. most promoting both, a decrease diameter an increase area. Ca(OH)2 led to...

Abstract In this work, the biodegradable poly(butylene adipate‐co‐terephthalate) (PBAT)/poly(lactic acid) (PLA) blend (ECOVIO®) and lignin, a renewable natural polymer with high UV absorption modified by gamma radiation were used to produce agriculture mulch films. Lignin was gamma‐irradiated at 30 60 kGy. The irradiated non‐irradiated lignin content of 2 wt% incorporated into PBAT/PLA matrix using twin‐screw extruder extrusion blown film prepare flexible PBAT/PLA/LIGNIN films characterized...

The development of polymeric biocomposites containing natural fibers has grown over the years due to properties achieved and its eco-friendly nature. Thus, involving a polymer from renewable source (Biopolyethylene (BioPE)) babassu (BFs), compatibilized with polyethylene grafted maleic anhydride (MA) acrylic acid (AA) (PE-g-MA PE-g-AA, respectively) were obtained using melt mixing injection molded into tensile, impact, HDT specimens. Babassu fiber was characterized Fourier transform infrared...

We studied the crystallization and melting phenomena of poly (3- hydroxybutyrate) (PHB), a biodegradable biocompatible semi-crystalline thermoplastic, obtained from renewable resources. Its high crystallinity motivated several studies on behavior, also ways to increase amorphous polymer fraction. The effect heating cooling rates commercial PHB was investigated by differential scanning calorimetry. Several rates, ranging 2.5 20 °C min–1, were used study phase changes during...

Abstract Poly(lactic acid) has been gaining prominence in academia and industry, mainly due to being a biopolymer biodegradable material. Nevertheless, its high fragility, work carried out order seek alternatives improve this drawback. Hence, aims evaluate the effect of vinyl acetate content using two types EVA (EVA 1 with 28% 2 19%) dynamically vulcanized PLA/EVA blends, several dicumyl peroxide (DCP) contents, that is, 0.3, 0.5, 0.7 phr. Blends were produced an internal mixer, tensile,...

Abstract Polypropylene/ Syagrus Cearensis fiber composites compatibilized with polypropylene‐graft‐maleic anhydride (PP‐g‐MA) and styrene(ethylene‐butylene)‐styrene copolymer (SEBS‐g‐MA) were successfully produced using a co‐rotating twin‐screw extruder followed by injection molding. The characterized X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM). mechanical properties determined Izod impact tensile testing. Thermal obtained...

Abstract Acrylonitrile‐EPDM‐styrene (AES) was applied as an impact modifier for poly(lactic acid) (PLA), and the combined effect of dicumyl peroxide (DCP) crosslinking annealing heat treatment investigated. Torque rheometry, melt flow index (MFI), mechanical properties (impact, tensile, Shore D hardness), X‐ray diffraction (XRD), infrared spectroscopy (FTIR), deflection temperature (HDT), differential scanning calorimetry (DSC), electron microscopy (SEM) were There a considerable torque...

In this research, poly(lactic acid) (PLA) nanocomposites with multi-walled carbon nanotubes (MWCNT) were produced by extrusion, injection, and compression molding, focusing on electromagnetic shielding. Various amounts of (MWCNTs) tested in PLA matrix, specifically ranging from 1 to 4 parts per hundred resin (phr). The resulting analyzed before after undergoing annealing heat treatment. It was observed that as the MWCNT content increased, melt flow index decreased. This reduction indicates...

ABSTRACT Blends of poly (lactic acid) (PLA) enhanced with ethylene‐vinyl acetate copolymer (EVA) and dynamically vulcanized have garnered interest from researchers the polymer industry due to their versatility combined properties. These include high elasticity EVA environmentally friendly characteristics PLA, which is both a biopolymer biodegradable. This study aims produce PLA/EVA blends dicumyl peroxide (DCP) evaluate rheological, thermal, morphological, ductile–brittle transition The...

ABSTRACT The curing kinetics of a biobased epoxy, formulated based on epoxidized soybean oil (ESO) and isosorbide (ISO), catalyzed by aluminum triflate, Al(OTf) 3 , were investigated using differential scanning calorimetry (DSC). resins synthesized with catalyst concentrations at 0.05, 0.07, 0.10 mol% upon two different ratios ESO to ISO (1:1 1:2). exothermic peak associated the epoxy ring opening was observed temperatures ranging from 80°C 115°C, influenced both heating rate amount...

Blending of biodegradable polymers in combination with low-price organic fillers has proven to be a suitable approach produce cost-effective composites order address pollution issues and develop products superior mechanical properties. In the present research work PBAT/PHB/Babassu 25, 50, 75% each polymer 20% Babassu were produced by melting extrusion. Their thermal, mechanical, morphological behavior was investigated differential scanning calorimetry (DSC), tensile testing, electron...

Photodegradation of PCL was performed exposing injected specimens to ultraviolet radiation (UV-B) up 9 weeks. Photodegradated were tested by Differential Scanning Calorimetry (DSC), Infrared Spectroscopy (FTIR), mechanical properties, Optical Microscopy (MO) and Electron (SEM).Upon exposure decrease in elongation at break increase elastic modulus verified, higher degree crystallinity observed for longer what can be due the chemi-crystallization mechanism. From IR spectra new carbonyl group...

Biocomposites processed with polycaprolactone (PCL) and macaíba fiber (MF) were melting extruded in this work MF content ranging from 10% to 20%. was naturally added PCL as also chemically treated maleic anhydride (MA), sodium hydroxide (NaOH), 3-Methacryloxypropyltrimethoxysilane (Silane). Afterwards biocomposite thermally, spectroscopically, mechanically morphologically characterized. From the gathered results, higher thermal stability observed for biocomposites upon content, regarding...

Poly (lactic acid) (PLA) is widely used biodegradable thermoplastic in the additive manufacturing, mainly on manufactured products through 3D printing. However, PLA highly fragile and presents low impact strength; hence improvements this way are industrially technologically important. Aiming to develop proper methodology for higher performance, work investigated effects of thermal annealing mechanical properties (impact, tensile, Shore D hardness), heat deflection temperature (HDT), Vicat...

Epoxidized vegetable oil (EVO)-based epoxy systems offer a promising avenue for replacing non-recyclable petroleum-based thermoset elastomers. Looking towards future prospects, they also hold potential to evolve into sustainable covalent adaptable networks (CANs). Typically, transesterification-based CANs require catalysts achieve crosslinked structures that are reprocessable at relatively high temperatures (T ≥ 150 °C). In this study, epoxidized soybean (ESBO) was cross-linked with eutectic...