Molecular Dynamic Evaluation of starch-PLA blends nanocomposite with organoclay by proton NMR relaxometry

Brito, Luciana Macedo; Chávez, Fabián Vaca; Tavares, Maria Inês Bruno; Sebastião, Pedro J.

doi:10.1016/j.polymertesting.2013.07.002

Cited by 20 publications

(11 citation statements)

References 24 publications

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“…The effects of the filler on the dynamics of the PVB chains were studied by 1 H time domain nuclear magnetic resonance (NMR) and fast field-cycling (FFC) NMR relaxometry. These two techniques are less standard in material characterization, although they have often been employed to get insight into structural and dynamic issues in polymer science, including the existence of polymer regions with different mobilities in filled elastomers [20][21][22][23][24][25][26][27]. Finally, considering that the films could be used as plastic layers in the manufacturing of functional safety glass, the effect of both fillers on NIR shielding and optical transparency of the matrix was tested through ultraviolet(UV)-visible(Vis)-NIR transmittance measurements.…”

Section: Introductionmentioning

confidence: 99%

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

et al. 2019

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Films made of poly(vinyl butyral) (PVB) and antimony-doped tin oxide (ATO) nanoparticles (NPs), both uncoated and surface-modified with an alkoxysilane, were prepared by solution casting at filler volume fractions ranging from 0.08% to 4.5%. The films were characterized by standard techniques including transmission electron microscopy, thermogravimetric analysis and differential scanning calorimetry (DSC). In the polymeric matrix, the primary NPs (diameter ~10 nm) aggregate exhibiting different morphologies depending on the presence of the surface coating. Coated ATO NPs form spherical particles (with a diameter of 300–500 nm), whereas more elongated fractal structures (with a thickness of ~250 nm and length of tens of micrometers) are formed by uncoated NPs. The fraction of the polymer interacting with the NPs is always negligible. In agreement with this finding, DSC data did not reveal any rigid interface and 1H time domain nuclear magnetic resonance (NMR) and fast field-cycling NMR did not show significant differences in polymer dynamics among the different samples. The ultraviolet-visible-near infrared (UV-Vis-NIR) transmittance of the films decreased compared to pure PVB, especially in the NIR range. The solar direct transmittance and the light transmittance were extracted from the spectra according to CEN EN 410/2011 in order to test the performance of our films as plastic layers in laminated glass for glazing.

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Section: Introductionmentioning

confidence: 99%

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

et al. 2019

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“…The peak displacements indicate that the mango components alter the PLA crystallite chain packing . The addition of “bofe” nano‐organo‐montmorillonite to the PLA–almond–tegument composite [Figure (b)] caused a slight displacement of the PLA peak at 2θ ~ 22.3° toward higher 2θ degrees, although the PLA peaks are less intense in the PLA–“bofe” sample, probably indicating that the organoclay diminished the crystallinity of the samples . The addition of the “chocolate” nano‐organo‐montmorillonite to the PLA–almond–tegument composite [Figure (c)] also caused displacement of PLA's peaks.…”

Section: Resultsmentioning

confidence: 99%

Poly(lactic acid) biocomposites with mango waste and organo‐montmorillonite for packaging

Lima

Minguita

et al. 2019

J of Applied Polymer Sci

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Poly(lactic acid) (PLA) is a biodegradable polymer used in packaging, but its properties can be improved by manufacturing composite matrixes. The combination of PLA, starch, and nano‐montmorillonite leads to materials with superior mechanical properties. Mango lump is rich in cellulose and starch. The goal of this study is to develop and characterize biocomposites based on PLA, mango waste, and nano‐organo‐montmorillonite for packaging. The samples were microstructurally, morphologically, and mechanically characterized. Physical interaction between the phases was observed. The mango components displaced the PLA X‐ray diffraction peaks and the clays altered their intensity, by interfering with chain packing. The addition of single components to PLA increased the samples’ transition temperatures, but the addition of multiple components diminished them. PLA showed adhesiveness to cellulose fibers and nonadhesiveness to starch granules. Thicker samples presented better mechanical properties. PLA–mango–“chocolate clay” samples are relatively stable materials, while PLA–mango–“bofe clay” samples could represent promising highly biodegradable materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47512.

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“…; Brito et al . ). Films based on starch and fibers have suitable mechanical properties and could be used for packaging production (Müller et al .…”

Section: Introductionmentioning

confidence: 97%

Production and Characterization of Bags from Biocomposite Films of Starch‐Vegetal Fibers Prepared by Tape Casting

Scheibe

Moraes

Laurindo

2014

J Food Process Engineering

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In this study, the production of starch films reinforced with cellulose fibers was performed by the tape‐casting technique, which allows preparing films with much larger dimensions, if compared with the classical casting technique. Tape casting is well known in other areas; however, there is a lack in the literature about its use for manufacturing biodegradable films. Using this technique, it was possible to develop bags with 100% biodegradable materials. Puncture and tear propagation resistance, and tensile strength of films prepared with different thicknesses were determined. The films heat sealability, wettability and printability were also studied. Overall, the mechanical properties showed that the thicker films had higher tensile strength. The most suitable heat‐sealing temperature was 150°C. The results indicate that the obtained biodegradable bags have potential to be used for packaging products with dry surfaces (some fruits, clothes), contributing to reduce the impact of oil‐based plastic in the environment. Practical Applications The starch film, classically prepared by the casting technique, presents small dimensions, which does not allow large‐scale production. With tape‐casting technique, it can be produced films with much larger dimensions, which can be used to form 100% biodegradables packages. These packages can be used to pack products with dry surfaces like some fruits, clothes and others. The present work studies the starch‐cellulose fibers films properties with the purpose of forming biodegradable packages. Some parameters like sealability, wettability, printability, puncture resistance, tensile resistance and tear resistance were determined in order to produce a bag with good characteristics.

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Molecular Dynamic Evaluation of starch-PLA blends nanocomposite with organoclay by proton NMR relaxometry

Cited by 20 publications

References 24 publications

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

Poly(lactic acid) biocomposites with mango waste and organo‐montmorillonite for packaging

Production and Characterization of Bags from Biocomposite Films of Starch‐Vegetal Fibers Prepared by Tape Casting

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