Reduced physical aging rates of polylactide in polystyrene/polylactide multilayer films from fast scanning calorimetry

Monnier, Xavier; Nassar, Samira Fernandes; Domenek, Sandra; Guinault, Alain; Sollogoub, Cyrille; Dargent, Éric; Delpouve, Nicolas

doi:10.1016/j.polymer.2018.07.017

Cited by 16 publications

(19 citation statements)

References 71 publications

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“…The quantity of recovered enthalpy at the longest aging times was near to the estimated total enthalpy loss, which showed that the theoretical thermodynamic equilibrium (within the measurement uncertainty) was reached within the experimental time. The H Δ values of PLA reached after 1000 min aging are comparable to already published data [31][32][33]. The curves in Fig.…”

Section: Glass Transition and Physical Aging Of Pla Pla/zno_r And Plsupporting

confidence: 89%

Impact of ZnO nanoparticle morphology on relaxation and transport properties of PLA nanocomposites

et al. 2019

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In this work we study the effect of zinc oxide (ZnO) nanoparticle morphology and concentration on the resulting relaxation and transport properties of polylactide (PLA) nanocomposites. Films containing spherical and rodshaped ZnO nanoparticles were incorporated into an amorphous polylactide (PLA) matrix through a solventprecipitation and compression moulding method. Morphological analyses carried out by scanning electron microscopy (SEM) together with ultraviolet-visible (UV-Vis) spectroscopy and thermogravimetric analysis (TGA). Results indicate a much better distribution of rod-shaped ZnO within PLA matrix. Relaxation experiments reveal faster physical aging kinetics of PLA in presence ZnO nanoparticles notwithstanding their shape, suggesting the presence of non-interacting surfaces between the amorphous PLA matrix and the ZnO nanoparticles. Interestingly, both helium and oxygen permeability remained stable or increase upon nanoparticle addition, and anisole sorption kinetics showed faster mass transport in the nanocomposites, suggesting that the low interfacial adhesion between PLA and ZnO brings supplementary voids to the material increasing mass transport. Overall, the experimental findings here reported provide a deeper understanding on the influence of metal oxide nanoparticle morphology on the resulting relaxation and gas transport properties of amorphous polymeric nanocomposites.

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Section: Glass Transition and Physical Aging Of Pla Pla/zno_r And Plsupporting

confidence: 89%

Impact of ZnO nanoparticle morphology on relaxation and transport properties of PLA nanocomposites

et al. 2019

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“…Sample mass was determined by doing the comparison between the heat capacity step ΔCp obtained from the glass transition in MT-DSC and FSC on a sample at the amorphous state. More details regarding the recommended protocol for FSC analysis of multilayer samples were given in the work of Monnier et al [35].…”

Section: Structural Characterizationmentioning

confidence: 99%

Biodegradable PLA/PBS multinanolayer membrane with enhanced barrier performances

Messin

Marais

Follain

et al. 2020

Journal of Membrane Science

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Polyester multilayer membranes with more than 2000 alternating layers of poly(lactic acid) (PLA) and poly (butylene succinate) (PBS) were successfully prepared via a nanolayer coextrusion process equipped with a multiplying-element device. This process allows to make films consisting of very thin layers of polymers and in which a confinement effect of the semicrystalline polymer can be induced at point to significantly improve its physical properties. In this work, a homogeneous multinanolayer film of PLA/PBS was obtained without defaults or delamination, while the two polymers are immiscible. Continuous and homogeneous ultrathin layers of PBS (~45 nm) were obtained and the resulting confined structure of PBS led to an improvement of its barrier performances until 30% for oxygen, 40% for water and 70% for carbon dioxide. This improvement was explained by a decrease of the solubility coefficient and surprisingly not by the diffusion coefficient. This result was attributed to a slight orientation of the crystals in the extrusion direction and to the probable presence of an interphase between the layers of PLA and PBS.

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“…It is also well suited for studying structural recovery , and early stages of polymer degradation . It offers the possibility to magnify changes in recovery kinetics due to structural constraints, which could become a criteria for investigation of macromolecular alignment. In addition, this technique has shown great potential for investigating thermal events in material for which degradation under standard DSC conditions can occur.…”

Section: Emerging Techniques For Evaluation Of Orientationmentioning

confidence: 99%

Quantifying Polymer Chain Orientation in Strong and Tough Nanofibers with Low Crystallinity: Toward Next Generation Nanostructured Superfibers

et al. 2019

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Advanced fibers revolutionized structural materials in the second half of the 20 th Century.However, all high-strength fibers developed to date are brittle. Recently, pioneering simultaneous ultrahigh strength and toughness were discovered in fine (<250 nm) individual electrospun polymer nanofibers (NFs). This highly desirable combination of properties was attributed to high macromolecular chain alignment coupled with low crystallinity. Quantitative analysis of the degree of preferred chain orientation will be crucial for control of NF mechanical properties. However, quantification of supramolecular nanoarchitecture in NFs with low crystallinity in the ultrafine diameter range is highly challenging. Here, we discuss applicability of traditional as well as emerging methods for quantification of polymer chain orientation in nanoscale one-dimensional samples. Advantages and limitations of different techniques are critically evaluated on experimental examples. It is shown that straightforward application of some of the techniques to subwavelength-diameter NFs can lead to severe quantitative and even qualitative artifacts. Sources of such size-related artifacts, stemming from instrumental, materials, and geometric phenomena at the nanoscale, are analyzed on the example of polarized Raman method, but are relevant to other spectroscopic techniques. A proposed modified, artifact-free method is demonstrated. Outstanding issues and their proposed solutions are discussed. The results provide guidance for accurate nanofiber characterization to improve fundamental understanding and accelerate development of nanofibers and related nanostructured materials produced by electrospinning or other methods. We expect that the discussion in this review will also be useful to studies of many biological systems that exhibit nanofilamentary architectures and combinations of high strength and toughness.

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Reduced physical aging rates of polylactide in polystyrene/polylactide multilayer films from fast scanning calorimetry

Cited by 16 publications

References 71 publications

Impact of ZnO nanoparticle morphology on relaxation and transport properties of PLA nanocomposites

Impact of ZnO nanoparticle morphology on relaxation and transport properties of PLA nanocomposites

Biodegradable PLA/PBS multinanolayer membrane with enhanced barrier performances

Quantifying Polymer Chain Orientation in Strong and Tough Nanofibers with Low Crystallinity: Toward Next Generation Nanostructured Superfibers

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