Nonisothermal Melt Crystallization Kinetics of PHB/babassu Compounds

Lignin is natural and renewable polymer, the second most abundant on Earth. Properly used it can reduce synthetic and oil based materials in addition to contributing to the biodegradable systems. In this work, the kraft lignin was subjected to gamma radiation at absorbed doses of 30, 60, and 90 KGy in order to increase the interaction with “Poly(butylene adipate‐co‐terephthalate) (PBAT)/Poly(lactic acid) (PLA)” blend (Ecovio®). PBAT/PLA/lignin blends with 10% of the weight of lignin were produced by extrusion using twin‐screw extruder and characterized by Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), and Field emission scanning electron microscopy (FE‐SEM). FTIR spectra showed partial miscibility between PBAT/PLA and lignin, most due to the hydrogen bond between PBAT/PLA carbonyl and lignin hydroxyl, being intensified in irradiated lignin compounds. As evidenced on DSC scans, in PBAT/PLA/irradiated lignin the crystallization peak was shifted to lower temperatures and the crystallization rate decreased. Crystallization kinetics was modeled using Pseudo Avrami, and isoconversional models of Friedman and Vyazovkin. Pseudo‐Avrami displayed linearity deviation at beginning and crystallization ending due to the nucleation and secondary crystallization, while from Friedman and Vyazovkin the activation energy (Ea) was higher for PBAT/PLA/irradiated lignin 30 KGy, characterizing crystallization with higher energy consumption. FE‐SEM images showed better dispersion and miscibility in PBAT/PLA/irradiated lignin. The results indicate that the irradiation of Kraft lignin promotes miscibility and compatibility of PBAT/PLA/lignin.

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Enhanced miscibility of PBAT/PLA/lignin upon γ‐irradiation and effects on the non‐isothermal crystallization

Barros

Soares

Moura

et al. 2022

J of Applied Polymer Sci

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Non‐isothermal Crystallization Kinetics, Thermal, and Rheological Behavior of Linear/Branched Polypropylene Blends

Macedo

Campos

Lima

et al. 2022

Macromolecular Symposia

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This work aims at evaluating the rheological and thermal properties and non‐isothermal crystallization kinetics of blends of linear homopolymer polypropylene (HPP) and branched polypropylene (BPP). Two linear polypropylene's of different melt flow index (MFI) are used: H301 (10 g per 10 min) and H604 (1.5 g per 10 min); and one BPP (2 g pr 10 min). The rheological result shows that the H301/BPP blends have an increase in complex viscosity proportional to the addition of BPP amount, while for the H604/BPP blends, it is observed a higher influence of H604 on rheological properties. With the addition of 25 wt% of BPP, the strain hardening behavior is observed in the extensional rheology tests of the polymer blend. The DSC results show that the melt temperature and the crystallinity content in blends with BPP are affected by the molecular weight (MW) of the linear polymer. Results suggest that Pseudo‐Avrami/Jeziorny and Mo models can be used to predict the experimental results of crystallization kinetics of the blends with sufficient precision for all systems studied, regardless of MW. Therefore, it is possible to use the blends of HPP/BPP in processes that demand a combination of rheological properties, such as high strain hardening, and fast crystallization.

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Thermal behavior of polyethylene terephthalate/organoclay nanocomposites: investigating copolymers as matrices

et al. 2020

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Polyethylene terephthalate (PET)/clay nanocomposites have been widely studied. However, different PET copolymers are also produced in large scale but not commonly investigated as matrices for nanocomposites. In this work, PET‐based nanocomposites, with PET homopolymer and two PET copolymers as matrices, were prepared by melt blending with a commercial organoclay. The focus of this study was to investigate the thermal behavior of these materials by differential scanning calorimetry and thermogravimetric analysis and to provide a satisfactory crystallization kinetic modeling. X‐ray diffraction analysis showed that the nanocomposites exhibited clay intercalation. The glass transition temperature and the thermal stability of the materials decreased with an increase in clay content. The presence of clay did not affect the degree of crystallinity developed by the materials, although it caused the anticipation and acceleration of the crystallization events. A discussion is made about the application of a modified Avrami model for non‐isothermal crystallization and its validity. The modified Avrami model has proven to be a good choice for the non‐isothermal crystallization kinetic modeling of these nanocomposites under various heating/cooling rates, being useful for simulations under processing conditions.

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Nonisothermal Melt Crystallization Kinetics of PHB/babassu Compounds

Cited by 3 publications

References 38 publications

Enhanced miscibility of PBAT/PLA/lignin upon γ‐irradiation and effects on the non‐isothermal crystallization

Enhanced miscibility of PBAT/PLA/lignin upon γ‐irradiation and effects on the non‐isothermal crystallization

Non‐isothermal Crystallization Kinetics, Thermal, and Rheological Behavior of Linear/Branched Polypropylene Blends

Thermal behavior of polyethylene terephthalate/organoclay nanocomposites: investigating copolymers as matrices

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