Thermal, mechanical, and rheological properties of graphite‐ and graphene oxide‐filled biodegradable polylactide/poly(ɛ‐caprolactone) blend composites

Botlhoko, Orebotse Joseph; Ramontja, James; Ray, Suprakas Sinha

doi:10.1002/app.45373

Cited by 29 publications

(16 citation statements)

References 33 publications

(34 reference statements)

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“…In summary, lower activation energies to that of G‐filled blend composites were obtained for GO‐filled blend composites with high crystallization ability and electrical resistivity (poor electrical conductivity), whereas the G‐filled blend composites show significant improvement in the electrical conductivity. This behavior is further attributed to the surface morphology characteristics which were reported by Botlhoko et al . In brief, it was noted that the presence of GO particles reduced the droplets sizes of the domain PCL phase from 1.3 to 0.5 μm due to the loading effects and the enthalpy interaction of the particles and blend matrices.…”

Section: Resultsmentioning

confidence: 59%

“…GO was prepared through the chemical oxidation of natural G powder as per the improved Hummers method reported by the Tour and coworkers . Further details on GO synthesis can be found in the Supporting Information . The graphite, here, was used without any chemical or thermal treatment.…”

Section: Methodsmentioning

confidence: 99%

“…The samples containing 0, 0.05, 0.1, and 0.25 wt % G or GO filler are denoted as blend, blend/0.05G, blend/0.1G, blend/0.25G or blend/0.05GO, blend/0.1GO, and blend/0.25GO, respectively. For all samples, the PLA/PCL blend ratio was fixed at 60:40 because mechanical, thermal, and rheological properties of this formulation had been thoroughly characterized (see Supporting Information) . Neat PLA and neat PCL were also separately processed using the same method as above.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, we have reported the thermal, mechanical, and rheological properties of G‐ and GO‐filled PLA/PCL blend composites . The first step was to fine‐tune the chemistry of G surface to compatibilize with the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

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Enzymatic degradation, electronic, and thermal properties of graphite‐ and graphene oxide‐filled biodegradable polylactide/poly(ε‐caprolactone) blend composites

Botlhoko

Makwakwa

Ray

et al. 2018

J of Applied Polymer Sci

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Commodity polymers are the most widely used materials for electronic packaging applications. However, they are nondegradable and causing serious environmental damage. Addressing this challenge, the relative effects of graphite (G) and graphene oxide (GO) dispersion on the enzymatic degradation, electronic properties, thermal degradation, and crystallization behavior of enzyme degradable polylactide/poly(ε-caprolactone) blend composites is investigated. Owing to the oxygenated surface functionalities and excellent thermal conductivity arising from the carbon structure, the randomly dispersed GO particles do not provide electrical pathways and facilitate large enhancements in the electrical resistivity (126%) and thermal conductivity (72%) of the blend composites. However, while the G particles enhanced the thermal conductivity of the composites, they had little effect on enzymatic degradation. Furthermore, they reduced the electrical resistivity, particularly at high concentration (0.25 wt % G), as a result of the conducting delocalized electrons in the G structure and due to network formation. We also find that the energy required to initiate and propagate the thermal degradation process for GO-filled blend composites is relatively lower than that of G-filled blend composite. However, the former composites show higher crystallization rate coefficients value than that of G-filled composites and the neat blend, thereby providing better crystallization ability and miscibility with the matrix. In summary, the GO-filled blend composites are observed to show potential for use in sustainable materials for thermal management applications. (PLA) have attracted the most attention due to their short degradation periods (1-2 years in landfill sites), the ability to degrade through hydrolytic and enzymatic degradation and high level ofAdditional Supporting Information may be found in the online version of this article.

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Section: Resultsmentioning

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enzymatic degradation, electronic, and thermal properties of graphite‐ and graphene oxide‐filled biodegradable polylactide/poly(ε‐caprolactone) blend composites

Botlhoko

Makwakwa

Ray

et al. 2018

J of Applied Polymer Sci

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“…However, blending PP and LDPE is not always expected to result in improvement of the impact strength of PP owing to the immiscibility between PP and LDPE. Recently, a number of studies have shown that incorporating nanofillers and copolymers into polymer blends can improve the compatibility between blended polymers, and one such filler is montmorillonite (MMT) nanoclay. Pure MMT is incompatible with most organophilic polymers and leads to poor dispersion of silicate layers in the composites.…”

Section: Introductionmentioning

confidence: 99%

Structure–property relationship in PP/LDPE blend composites: The role of nanoclay localization

Mofokeng

Ray

Ojijo

2018

J of Applied Polymer Sci

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This article reports, for the first time, on how the kinetics and thermodynamics of the melt‐processing control the nano/micro‐structure development and properties of nanoclay‐filled polypropylene (PP)/low‐density polyethylene (LDPE) blend ternary composites. Morphological characterization suggests that the nano/micro‐structure of the PP/LDPE (80/20) blend can be controlled by incorporating nanoclay alone or by adding a mixture of organoclay and maleated compatibilizers. Simultaneous mixing of PP, LDPE, maleated compatibilizers, and organoclay results in homogeneous distribution of intercalated silicate layers in all the phases of the blend, a feature which profoundly affects the thermal stability and tensile and rheological properties of the blend composites. For example, the elongation‐at‐break for PP increases from 28.1 to 155.6% for composite containing both organoclay and maleated compatibilizers, whereas the thermal stability for PP increases from 269.8 to 303.3 °C for the same composite. However, the impact strength of the PP/LDPE blend decreases with incorporation of organoclay, regardless of the phase in which the nanoclay particles are localized. In summary, the obtained results show that regardless of the phase in which the nanoclay is localized, the morphology, and hence the properties, of the ternary composites are superior to those of the neat blend. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46193.

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Crystallization of PLA and Its Blends and Composites

Quiroz‐Castillo,

Cabrera‐González,

Val‐Félix

et al. 2023

Polymer Crystallization

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Thermal, mechanical, and rheological properties of graphite‐ and graphene oxide‐filled biodegradable polylactide/poly(ɛ‐caprolactone) blend composites

Cited by 29 publications

References 33 publications

Enzymatic degradation, electronic, and thermal properties of graphite‐ and graphene oxide‐filled biodegradable polylactide/poly(ε‐caprolactone) blend composites

Enzymatic degradation, electronic, and thermal properties of graphite‐ and graphene oxide‐filled biodegradable polylactide/poly(ε‐caprolactone) blend composites

Structure–property relationship in PP/LDPE blend composites: The role of nanoclay localization

Crystallization of PLA and Its Blends and Composites

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