MMT and LDH organo-modification with surfactants tailored for PLA nanocomposites

Coiai, Serena; Cicogna, Francesca; Santi, Alessandra De; Amaro, Lucía Pérez; Spiniello, Roberto; Signori, Francesca; Fiori, Stefano; Oberhauser, Werner; Passaglia, Elisa

doi:10.3144/expresspolymlett.2017.18

Cited by 16 publications

(13 citation statements)

References 32 publications

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“…The positive charge of the layers is balanced by intercalated hydrated anions [25]. Unmodified HT, as well as commercial or ad hoc modified HT, have been extensively used as filler for PLA based nanocomposites [26][27][28][29][30][31]. Nevertheless, to the best of our knowledge no work investigated how the reprocessing affects the properties of PLA/HT nanocomposites.…”

Section: Introductionmentioning

confidence: 88%

Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites

Scaffaro¹,

Sutera²,

Mistretta³

et al. 2017

Express Polym. Lett.

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Abstract. In this work the effect of multiple reprocessing was studied on molecular structure, morphology and properties of poly(lactic acid)/hydrotalcites (PLA/HT) nanocomposites compared to neat PLA. In addition, the influence of two different kinds of HT -organically modified (OM-HT) and unmodified (U-HT) -was evaluated. Thermo-mechanical degradation was induced by means of five subsequent extrusion cycles. The performance of the recycled materials was investigated by mechanical and rheological tests, differential scanning calorimetry (DSC), intrinsic viscosity measurements and SEM observation. The results indicated that the best morphology was achieved in the systems incorporating OM-HT. On increasing the extrusion reprocessing cycles, the properties showed behavior due to two opposite effects: i) chain scission due to thermo-mechanical degradation and ii) filler dispersion effect resulting from multiple processing. In particular, at low reprocessing cycles, both tensile and rheological properties seem to be mainly affected by HT dispersion, especially when OM-HT was added. After five reprocessing cycles, on the contrary, chain scission, i.e. thermo-mechanical degradation, dominated. As regards the effect of the presence of organic modifier in HT, the results indicated that this variable apparently did not affect the macroscopic performance of the nanocomposites, especially at high reprocessing cycles.

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Section: Introductionmentioning

confidence: 88%

Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites

Scaffaro¹,

Sutera²,

Mistretta³

et al. 2017

Express Polym. Lett.

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“…Organomodification increases the gallery spacing of LDHs because LDHs and the organic polymer matrix are basically incompatible. In the past two decades, many reports on the intercalation of organic anions into LDHs have appeared …”

Section: Introductionmentioning

confidence: 99%

“…In the past two decades, many reports on the intercalation of organic anions into LDHs have appeared. 8,12,13 Because of the growing use of PET in the plastics industry (especially for beverage bottles), resource depletion and ecology destruction problems have emerged. For environmental conservation, it has become necessary to promote ecofriendly industries and to recycle the waste products.…”

Section: Introductionmentioning

confidence: 99%

The Role of Organomodified DifferentLDHson Recycled Poly(ethylene terephthalate) Nanocomposites

Tsai

Bunekar

2017

J Chinese Chemical Soc

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Recycled poly(ethylene terephthalate)/organomodified‐layered double hydroxide (PET/organo‐LDH) nanocomposites were successfully synthesized via a melt‐extrusion method. In an attempt to improve the compatibility with PET, LiAl, MgAl, and ZnAl LDH surfaces were modified with sulfanilic acid (SAS) via electrostatic interaction with LDH cationic layers. In PET nanocomposites containing SAS‐modified LDH, the (00l) X‐ray diffraction (XRD) peaks originating from organo‐LDH were not observed, indicating that the organomodified LDH layers were fully exfoliated and homogeneously dispersed within the PET matrix, which was also confirmed by transmission electron microscopy analysis. However, PET nanocomposites containing SAS‐modified LiAl, MgAl, and ZnAl LDH showed broad (00l) XRD peaks, indicating that the organo‐LDH was partially exfoliated. Thermogravimetric analysis confirmed that the thermal stability of PET/SAS‐modified LDH was significantly improved, depending on the type and loading content of SAS‐modified LDH compared to that of pristine PET. PET nanocomposites containing well‐dispersed SAS‐modified LDH showed substantial enhancement of the storage modulus.

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“…Montmorillonite (MMT) is a cost-effective additive in polymers and currently the most researched filler for polymer composites. The use of MMT and graphene individually as nanofiller in the polymer matrix has been well established and available in the literature (Alexandre et al, 2000;Arroyo et al, 2010;Bijarimi et al, 2019;2020;Coiai et al, 2017;Gonçalves et al, 2016;Jalalvandi et al, 2015;Keramati et al, 2016;Li et al, 2017;Manafi et al, 2014;Pinto et al, 2016;Sabzi et al, 2015;Scaffaro et al, 2016;Sharma et al, 2018;Young et al, 2018). Nevertheless, there is a limitation for polymer nanocomposites based on MMT alone, such as brittleness and thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid)/Acrylonitrile Butadiene Styrene Nanocomposites with Hybrid Graphene Nanoplatelet/Organomontmorillonite: Effect of Processing Temperatures

Bijarimi

Syuhada

Zulaini

et al. 2020

International Polymer Processing

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This work reports the preparation and characterization of poly(lactic) acid/acrylonitrile butadiene styrene/graphene nanoplatelets/Cloisite C20A montmorillonite (PLA/ABS/GnP/C20A) nanocomposites via melt blending. The clay is hybridized with graphene to increase its dispersion in the polymer matrix. The melt processing temperatures play a vital role in the properties of the resulting nanocomposites in dictating the extent of thermal stability and dispersion of the fillers. The hybrid nanocomposites were characterized for stress-strain, thermal, chemical, and morphological properties. The findings were that there was an increase in the mechanical properties in terms of tensile strength and Young's modulus with the PLA/ABS/GnP/C20A at the high-temperature profile having the highest values of 43.1 MPa and 2533 MPa. The elongation at break increases slightly, due to the brittle properties of GnP. It was found that the dispersion of the fillers increased with increasing temperature profiles, as revealed by the morphological analysis by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The void size was also observed to be smaller and more homogenous with increasing temperature. However, in terms of thermal degradation analysis, the addition of fillers increases its thermal stability as the decomposition onset temperature increases by 22.5 8C.

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MMT and LDH organo-modification with surfactants tailored for PLA nanocomposites

Cited by 16 publications

References 32 publications

Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites

Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites

The Role of Organomodified DifferentLDHson Recycled Poly(ethylene terephthalate) Nanocomposites

Poly(lactic acid)/Acrylonitrile Butadiene Styrene Nanocomposites with Hybrid Graphene Nanoplatelet/Organomontmorillonite: Effect of Processing Temperatures

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