Structure and properties of poly(lactic acid)/poly(ε‐caprolactone) nanocomposites with kinetically induced nanoclay location

Urquijo, J.; Dagréou, Sylvie; Guerrica-Echevarría, Gonzalo; Eguiazábal, J. I.

doi:10.1002/app.43815

Cited by 16 publications

(17 citation statements)

References 55 publications

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“…In the NCs of the present work, this reinforcing effect occurs in the PCL dispersed phase, where the CNTs are selectively located, because, as mentioned previously, CNTs are effective at stiffening PCL . In addition, the bibliography also shows that well‐dispersed nanoparticles improve the stiffness of polymer blends even when they are located in the minor phase, both in PLA/PCL‐based and in other blends‐based NCs …”

Section: Resultssupporting

confidence: 70%

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Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Urquijo¹,

Dagréou

Guerrica-Echevarría³

et al. 2017

J of Applied Polymer Sci

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Poly(lactic acid)/poly(ɛ‐caprolactone)/carbon nanotube (PLA/PCL/CNT) nanocomposites (NCs) were melt‐processed in a conventional industrial‐like twin‐screw extruder maintaining a constant PLA/PCL 80/20 wt. ratio. CNTs located in the thermodynamically favored PCL phase and, as a result, the “sea–island” morphology of the unfilled blend was replaced by a more continuous PCL dispersed phase in the ternary NCs. Rheological and electrical percolation took place at the same CNT contents (over 1.2 wt %) that TEM images suggest continuity of the PCL phase. The electrical and the low‐strain mechanical behaviors upon CNT addition were similar in the reference binary PLA/CNT and ternary PLA/PCL/CNT NCs. In the percolated NCs, the conductivity became 106–107 times higher than in the insulating compositions, while the Young modulus increased linearly upon the addition of CNT (12% increase at 4.9 wt % loading). Moreover, all the PLA/PCL/CNT NCs showed a ductile behavior (elongation at break >130%) similar to that of the unfilled PLA/PCL blend (140%), in contrast to the brittle behavior of binary PLA/CNT NCs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45265.

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Section: Resultssupporting

confidence: 70%

“…This liquid to solid‐like transition is called rheological percolation. In the case of PLA/CNT NCs, the rheological percolation threshold is observed between 1 and 1.5 wt % of CNT …”

Section: Resultsmentioning

confidence: 99%

Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Urquijo¹,

Dagréou

Guerrica-Echevarría³

et al. 2017

J of Applied Polymer Sci

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“…The PCL/PLA blend's complex viscosity [Figure (a)] shows a Newtonian fluid behavior (constant viscosity) over a wide angular‐frequency range, with a plateau falling only from ω > 65 rad/s, due to the increase in shear rate. A similar behavior was observed in PLA/PCL blends with different concentrations . With the nanoparticle addition to the ternary systems, the Newtonian plateau disappears and the complex viscosity increases mainly in the terminal region (ω → 0), from 83 Pa s (PCL/PLA) to 155 Pa s with hBN and to 185 Pa s with TiO 2 .…”

Section: Resultssupporting

confidence: 75%

“…Many factors have been studied to explain the nanoparticles' localization in immiscible polymer blends. Among such, the thermodynamic factors that account for the components' interfacial tension; the processing conditions including the mixing sequence, temperature, time, and shear rate; rheological factors such as the polymers' viscosity and elasticity; and the nanoparticles' intrinsic characteristics, such as surface aspect ratio and functionalization …”

Section: Introductionmentioning

confidence: 99%

Effects of processing conditions on hybrid filler selective localization, rheological, and thermal properties of poly(ε‐caprolactone)/poly(lactic acid) blends

Decol

Pachekoski

Segundo

et al. 2019

J of Applied Polymer Sci

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In this study, the effects of processing conditions through different mixing sequences were used to analyze the factors, which could influence the hybrid filler selective localization in an immiscible polymer blend and how localization can influence the rheological and thermal properties. Different selective localizations were observed depending on the mixing sequence used when the hybrid filler was added. Notably, nanoparticles can interact with each other, which favor a synergy between them and alters, besides the localization, the dispersion state, or can interact with one polymer phase, and also alter the nanoparticles' selective localization. An improvement in rheological properties was observed in the hybrid nanocomposite in which there was interaction between the nanoparticles, favoring the hexagonal boron nitride exfoliation. On the other hand, for the storage modulus and degree of crystallinity, the sharpest increase occurred in the hybrid nanocomposite in which the nanoparticles could interact preferably with one polymer phase. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48711.

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“…The nanoparticle localization depends on various factors, such as thermodynamics, and kinetic effects, rheological properties, and nanoparticle geometry. In general, a competition between those factors occurs for the definition of the nanoparticles localization in a polymer blend . The rheological effect on selective nanoparticle localization was investigated by Feng et al .…”

Section: Introductionmentioning

confidence: 99%

Mixing‐sequence controlled selective localization of carbon nanoparticles in PLA/PCL blends

Aguiar

Decol

Pachekoski

et al. 2018

Polymer Engineering & Sci

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This work proposes modifying the adding sequence of components during the production of poly(lactic acid) (PLA) and poly(ε‐caprolactone) (PCL) ternary systems with multiwalled carbon nanotubes (CNT) or graphene nanoplatelets (GN), in order to analyze the nanoparticles’ selective localization in terms of the competition between different factors, such as kinetics, thermodynamics, rheology, and geometry. In the studied system, the PLA's viscosity is higher than the PCL's and the difference in interactions between the CNT or the GN/PLA and the CNT or the GN/PCL is small, meaning the viscosity effects could dominate. However, other factors, such as thermodynamics and geometry, can be observed to compete with the rheological factor, depending on the mixing sequences. Depending on the processing time, a competition between thermodynamics and rheological factors could be observed when the nanoparticles had contact first with the thermodynamically favored phase. The competition between geometrical and rheological factors was observed in the presence of GN in the PLA phase, in the system in which the GN was added first to the PLA phase, which is the phase of lowest affinity. POLYM. ENG. SCI., 59:323–329, 2019. © 2018 Society of Plastics Engineers

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Structure and properties of poly(lactic acid)/poly(ε‐caprolactone) nanocomposites with kinetically induced nanoclay location

Cited by 16 publications

References 55 publications

Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Morphology and properties of electrically and rheologically percolated PLA/PCL/CNT nanocomposites

Effects of processing conditions on hybrid filler selective localization, rheological, and thermal properties of poly(ε‐caprolactone)/poly(lactic acid) blends

Mixing‐sequence controlled selective localization of carbon nanoparticles in PLA/PCL blends

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