Polycaprolactone/babassu compounds: Rheological, thermal, and morphological characteristics

Reul, Lizzia Tanira Albuquerque; Pereira, Camila Ariana Becker; Sousa, Fernanda M.; Santos, Raquel Marques dos; Carvalho, Laura H.; Canedo, Eduardo L.

doi:10.1002/pc.24861

Cited by 20 publications

(19 citation statements)

References 21 publications

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“…As reported elsewhere 27,28,30,[39][40][41][42][43][44] PHB crystallizes only partially from the melt during the cooling stage, and the crystallization process is completed during the reheating stage (cold crystallization). However, in PHB compounds with 20% babassu fiber content, full melt crystallization was verified in all tests, suggesting a strong nucleating effect of the filler.…”

Section: Resultsmentioning

confidence: 51%

Nonisothermal Melt Crystallization Kinetics of PHB/babassu Compounds

et al. 2018

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PHB has interesting features such as biodegradability, sustainability and durability. However, it has a high cost, in addition to being hard, brittle and thermally unstable during processing. Therefore, it was found convenient to study the crystallization of PHB/20% babassu compounds, with the intention of reducing the cost of the composite, in addition to seeking improvements in thermal properties. In this work, the parameters of melt crystallization were studied for PHB/20% babassu compounds driven at different cooling rates under a nitrogen flow. Subsequently, crystallization parameters were compared for different cooling rates. A kinetic analysis of data obtained for melt crystallization was performed. Among the models studied, Pseudo-Avrami showed the best correlation with experimental data, with discrepancy between +6% and -4%. The Mo model presented a discrepancy between +15% and -8%. A modified Mo model discrepancies are reduced to +3% and -4% within the range of validity of the model.

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Section: Resultsmentioning

confidence: 51%

Nonisothermal Melt Crystallization Kinetics of PHB/babassu Compounds

et al. 2018

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“…Where Z* is the torque adjusted to the reference temperature T* (200ºC). β is the exponential temperature coefficient of the material which was determined to be β0.017°C -1 for PCL β0.025°C -1 for PBAT and β0.014 °C-1 for the PBAT/PCL blends, regardless of composition (Sousa et al, 2018;Reul et al, 2018;Sousa et al, 2016).…”

Section: Degradation During Processingmentioning

confidence: 99%

“…where RZ and RM are, respectively, the rates of change of the adjusted torque and the weight average molar mass of the material (Canedo, 2017) and n is the pseudoplasticity index of the material which for PCL, PBAT and the PBAT/PCL blends were determined to be 0.94; 0.60 and 0.59, respectively (Sousa et al, 2018;Reul et al, 2018;Sousa et al, 2016).…”

Section: Degradation During Processingmentioning

confidence: 99%

Rheological, thermal and mechanical characterization of PBAT/PCL/Stearates blends

Silva

Sousa

Almeida

et al. 2022

RSD

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The slow degradation and the high environmental impact caused by inappropriate disposal of polymer products are the main factors prompting scientists to either substitute conventional polymers by biodegradable ones or to enhance biodegradation of short-lived polymer products, particularly those used in packaging. Polymer blends of conventional and biodegradable polymers is one of the alternative solutions found to improve mechanical properties and accelerate polymer degradation after disposal. This work investigates the effect of incorporating different metallic stearates (Zn and Mg) on the rheological, thermal and mechanical characteristics of 75PBAT/25PCL blends processed in an internal laboratory mixer. The results of torque rheometry suggest degradation during processing potentialized with the stearates incorporation, while that of DSC indicated that the crystallinity of the blends increased with the incorporation of additives. TG data showed a reduction in the thermal stability of the systems containing stearates. Incorporation of stearates resulted in strongly thermally degraded systems. Adding up to 0.25% of magnesium stearate to the blend 75PBAT/25PCL leads to a material that combines maintenance or improvement of properties combined with higher decomposition.

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“…Degradation during processing was estimated by torque rheometry according to the procedure and models developed by Canedo and Alves 15 and Alves et al 16 , which can be applied for the study of polymer additives, blends and polymer matrix composites 5,14,[17][18][19][20][21][22] .…”

Section: Torque Rheometrymentioning

confidence: 99%

Characterization of Poly(Ethylene Terephthalate) by Torque Rheometry

et al. 2021

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Polymer processing parameters may considerably affect final product characteristic as, if properly chosen, these parameters may lead to products with optimal properties. The aim of this work is to evaluate the rheological characteristics of poly(ethylene terephthalate) (PET) by torque rheometry, as well as to estimate its incipient degradation rate during processing in an internal laboratory mixer. In order to estimate the temperature coefficient of the viscosity (β), and the pseudoplasticity index (n) of PET, two sets of experiments need to be performed. In the first one, the polymer is processed at three different temperatures at a single rotor speed for 10 min, getting temperature coefficient of the viscosity equal to β = 0.053 °C-1. In the second set of experiments, the resin (PET) is processed at a single temperature at six different rotor speeds for the same time interval and the pseudoplasticity index was determined, n = 0.78. From the results obtained, it is possible to indicate the internal mixer as an equipment not only for mixing polymers or composites, but as a tool for determining important rheological variables for predicting degradative processes.

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Polycaprolactone/babassu compounds: Rheological, thermal, and morphological characteristics

Cited by 20 publications

References 21 publications

Nonisothermal Melt Crystallization Kinetics of PHB/babassu Compounds

Nonisothermal Melt Crystallization Kinetics of PHB/babassu Compounds

Rheological, thermal and mechanical characterization of PBAT/PCL/Stearates blends

Characterization of Poly(Ethylene Terephthalate) by Torque Rheometry

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