Biodegradable Compounds of Poly (Ɛ-Caprolactone)/Montmorillonite Clays

Siqueira, Danilo Diniz; Luna, Carlos Bruno Barreto; Araújo, Edcleide Maria; Santos, Edson Antônio dos; Morais, Dayanne Diniz de Souza; Wellen, Renate Maria Ramos

doi:10.1590/1980-5373-mr-2018-0813

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…This finding is important from an industrial point of view, considering that PCL/JWF and PCL/JWF/PCL-g-MA biocomposites begin to solidify at higher temperatures. Literature [48][49][50] reported an increase in T C of PCL upon addition of carbon nanotubes, clay and zinc oxide. However, in the present work, an increase of approximately 7°C in T C of PCL/JWF and PCL/JWF/PCL-g-MA was achieved, adding an abundant residue without surface treatment.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Jatobá wood flour: An alternative for the production of ecological and sustainable PCL biocomposites

Luna

Filho

Siqueira

et al. 2022

Journal of Composite Materials

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The industrial residue of Jatobá wood flour (JWF) was reused during production of biocomposites based on polycaprolactone (PCL), 50% by weight of JWF was added to PCL matrix. Initially, maleic anhydride-grafted polycaprolactone compatibilizer (PCL-g-MA) was synthesized and characterized using X-ray diffraction (XRD), nuclear magnetic resonance (NMR) and degree of grafting. Afterwards, PCL/JWF and PCL/JWF/PCL-g-MA biocomposites were processed in an internal mixer and injection molded. From the gathered results, increase in torque and reduction in the melt flow index of PCL/JWF biocomposites were verified related to neat PCL. Upon addition of PCL-g-MA to PCL/JWF there was a lubricating effect with reduced torque and increased fluidity. PCL/JWF displayed increased elastic modulus, Shore D hardness, and heat deflection temperature (HDT) around 158.5%, 16% and 24.5%, respectively, related to PCL. Nevertheless, there was decline in tensile strength and impact strength, which were improved in PCL/JWF/PCL-g-MA, suggesting higher interaction among phases, providing greater stress transfer. An interesting finding was the nucleating effect of JWF in PCL matrix, as the increased degree of crystallinity and accelerated crystallization. Morphology of PCL/JWF evidenced several voids, but upon compatibilization with PCL-g-MA, the interfacial adhesion and wetness increased, improving the mechanical properties. JWF reusing presents great potential to produce sustainable biocomposites, reducing the final product costs.

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Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Jatobá wood flour: An alternative for the production of ecological and sustainable PCL biocomposites

Luna

Filho

Siqueira

et al. 2022

Journal of Composite Materials

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“…The mineral fillers effect has been investigated on the crystallization behavior of PCL [24,25]. Siqueira et al [26] showed that the montmorillonite clay accelerated the crystallization process of PCL, suggesting a nucleating effect. Paula et al [27] developed PCL nanocomposites with zinc oxide (ZnO).…”

Section: Introductionmentioning

confidence: 99%

Effect of kaolin waste annealing on the structural and thermal behavior of poly(ε−caprolactone)

Filho

Luna

Silva

et al. 2022

Momento

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The heat treatment effect on kaolin waste from mining was evaluated on the structural and thermal behavior of poly(ε-caprolactone) (PCL). The PCL/KW (kaolin waste) and PCL/HTKW (heat-treated kaolin waste) composites were processed in an internal mixer and subsequently characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The kaolin waste showed kaolinite and quartz in its composition, while the heat treatment at 1200°C modified it to mullite, quartz and silica-rich amorphous phase. By XRD, there was an increase in the intensity of the peak 2θ = 23.9° of the PCL/KW composites compared to neat PCL. In contrast, PCL/HTKW composites tended to reduce the intensity of the peak 2θ = 23.9°, especially at 5% HTKW. The crystalline melting temperature and the degree of crystallinity of PCL/KW and PCL/HTKW composites were practically unchanged, compared to PCL. However, the crystallization process was more effective with the kaolin waste (KW) without heat treatment, indicating that the HTKW amorphous phase inhibited crystallization. The PCL/KW development promoted an increase in crystallization temperature, relative crystallinity, and crystallization rate, surpassing PCL and the PCL/HTKW system. In view of this, kaolin waste has the potential to accelerate the PCL crystallization process, contributing to add value to a material that would otherwise be discarded and minimizing environmental impacts.

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“…[1,2] In parallel, the interest in nanotechnology has led to an accelerated growth of polymeric nanocomposites, due to their special properties such as high tensile strength, flame retardant, low gas permeability, and high thermal stability. [3][4][5] Polymeric nanocomposites comprise a class of materials formed by inorganic substances with nanometric dimensions, which are finely dispersed within the polymeric matrix, [6] whereas addition of nanofillers at low contents can provide the improvement of mechanical and barrier properties, thermal and dimensional stabilities, as well as flame retardancy. [7] Among polymeric nanocomposites, great attention has been given to the polyamide 6 (PA6) ones due to its feasibility in applications such as automotive, packaging, anti-corrosion, and textile products.…”

Section: Introductionmentioning

confidence: 99%

Tuning the performance of PA6/EPDM‐MA nanocomposites reinforced with Ni_0.₅Zn₀_.₅Fe₂O₄. Effect of the mixing protocol on mechanical, thermal, thermomechanical, magnetic, and morphological behavior

et al. 2022

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The mixing protocol effect was investigated in nanocomposites based on polyamide 6 (PA6) and maleic anhydride grafted ethylene-propylene-diene (EPDM-MA), using Ni-Zn ferrite as filler. The nanocomposites were processed using an internal mixer and specimens were injection molded. Compounds properties were investigated through Izod impact strength, tensile strength, x-ray diffraction (XRD), magnetic measurements, differential scanning calorimetry (DSC), thermogravimetry (TG), heat deflection temperature (HDT), and scanning electron microscopy (SEM). PA6/EPDM-MA mixture showed super-tough behavior, with an increase of around 918% in impact strength, compared with PA6. However, there was a loss close to 50% in the elastic modulus and 5% in HDT, due to the high flexibility. In view of this, this mixture was selected for the production of nanocomposites toughened with Ni-Zn ferrite, using three mixing sequences. When the nanocomposite was processed by the simultaneous mixing of all components (PA6/EPDM-MA/Ni-Zn), the highest impact strength (458 J/m) was reached, corresponding to a gain of 486%, compared with PA6. On the other hand, when Ni-Zn ferrite and PA6 were initially premixed by melting, before EPDM-MA addition in a second processing step, HDT and impact strength properties increased by 6% and 281%, in relation to PA6. In addition, the nanocomposites showed magnetic responses, with a soft material behavior, that is, they magnetize and demagnetize easily. In general, toughened and magnetic nanocomposites were produced, with good mechanical and thermal properties, displaying potential to produce magnetic films.

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Biodegradable Compounds of Poly (Ɛ-Caprolactone)/Montmorillonite Clays

Cited by 11 publications

References 35 publications

Jatobá wood flour: An alternative for the production of ecological and sustainable PCL biocomposites

Jatobá wood flour: An alternative for the production of ecological and sustainable PCL biocomposites

Effect of kaolin waste annealing on the structural and thermal behavior of poly(ε−caprolactone)

Tuning the performance of PA6/EPDM‐MA nanocomposites reinforced with Ni_0.₅Zn₀_.₅Fe₂O₄. Effect of the mixing protocol on mechanical, thermal, thermomechanical, magnetic, and morphological behavior

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Biodegradable Compounds of Poly (Ɛ-Caprolactone)/Montmorillonite Clays

Cited by 11 publications

References 35 publications

Jatobá wood flour: An alternative for the production of ecological and sustainable PCL biocomposites

Jatobá wood flour: An alternative for the production of ecological and sustainable PCL biocomposites

Effect of kaolin waste annealing on the structural and thermal behavior of poly(ε−caprolactone)

Tuning the performance of PA6/EPDM‐MA nanocomposites reinforced with Ni0.5Zn0.5Fe2O4. Effect of the mixing protocol on mechanical, thermal, thermomechanical, magnetic, and morphological behavior

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Tuning the performance of PA6/EPDM‐MA nanocomposites reinforced with Ni_0.₅Zn₀_.₅Fe₂O₄. Effect of the mixing protocol on mechanical, thermal, thermomechanical, magnetic, and morphological behavior