Gamma irradiation effects on polycaprolactone/zinc oxide nanocomposite films

Paula, Marcos Vinícius da Silva; Diego, Ivo; Dionisio, Ronaldo; Vinhas, Glória Maria; Alves, Severino

doi:10.1590/0104-1428.04018

Cited by 31 publications

(13 citation statements)

References 30 publications

(52 reference statements)

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“…At the add ZnO (1%wt and 5%wt) to PCL the last temperature (Tf) became 493.6°C and 379.3°C for respectively. The Melting temperature decreased of the PCL/ZnO composite due to the decreased crystallization of composites that agree with Paula et al [14].…”

Section: Wettability and Contact Anglesupporting

confidence: 90%

Wettability, Thermal Stability, and Antibacterial Properties of Polycaprolactone /ZnO Nanocomposites in Packaging

Obaid¹,

Ali²

2020

IJP

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Polycaprolactone is one of the natural biodegradable polymers mainly used in bioplastics production for packaging, usually composed of non-toxic compounds and biodegradable. The aim was to examine the role of zinc oxide (ZnO) nanopowder on the,wettability , thermal and anti-bacterial effect nanocomposites. Pure PCL and PCL-based bio- nanocomposites doped with various ratios of ZnO nanoparticles from 0% to 5wt% were prepared through the arrangement of throwing procedure. The results show that wettability properties in relation to ideal PCL and that they were increasingly hydrophobic from 57º.8 to 69º.53 because add ZnO nanocomposites,the thermal stability between 300 and 400 ° C makes them perfect for the application of food packaging application. Also, anti-bacterial screening against Gram-positive and Gram-negative microorganisms, which was highly variable and evident in comrades, was compared with PCL.

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Section: Wettability and Contact Anglesupporting

confidence: 90%

Wettability, Thermal Stability, and Antibacterial Properties of Polycaprolactone /ZnO Nanocomposites in Packaging

Obaid¹,

Ali²

2020

IJP

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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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“…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). The PCL crystalline melting temperature increased with the addition of up to 1 % ZnO, while a higher content began to decrease the melting temperature.…”

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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Gamma irradiation effects on polycaprolactone/zinc oxide nanocomposite films

Cited by 31 publications

References 30 publications

Wettability, Thermal Stability, and Antibacterial Properties of Polycaprolactone /ZnO Nanocomposites in Packaging

Wettability, Thermal Stability, and Antibacterial Properties of Polycaprolactone /ZnO Nanocomposites in Packaging

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)

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