Lignosulfonate interleaved layered double hydroxide: a novel green organoclay for bio-related polymer.

Mohammed Hennous 1 Zoubir Derriche Edwige Privas 2 Patrick Navard 2 Vincent Verney 3 Fabrice Leroux 4, *
* Corresponding author
3 Photochimie
ICCF - Institut de Chimie de Clermont-Ferrand
4 MI
ICCF - Institut de Chimie de Clermont-Ferrand
Abstract : New organic inorganic layered double hydroxide (LDH) organoclays are assembled through coprecipitation with lignosulfonate (LS) interleaved inorganic host structure sheets. The biopolymer is found to accommodate the interlayer space adopting a bilayer molecular arrangement resulting in a basal spacing of 2.54 nm. However the crystallinity of the resulting bio-organoclay is weak, probably due to the difficulty of the inorganic sheets to be built on amorphous polymer chain, the latter inducing low structural ordering. An organoclay of composition Zn2Al/LS is subsequently used as filler in three bio-related polyesters, poly(lactic) acid (PLA), poly(butylene) succinate (PBS) and poly(butylene adipate-co-terephthalate) (PBAT). Melt polymer extrusion using 5 wt.% organoclay loading yields polyester nanocomposite with a nanocomposite structure largely intercalated for both PLA and PBS (Δd (expansion) > 6 nm) while a non miscible structure is obtained for PBAT. The incorporation of hydrophilic Zn2Al/LS platelets decreases the water/polymer contact angle of about 10° for the LDH/LS PBAT composite only. A strong increase of the complex viscosity |η*| is observed for both nanocomposites Zn2Al/LS PLA and PBS compared to the polyester itself. This is explained on the basis of a chain extender behavior of the intercalated Zn2Al/LS platelets towards polymer chains as evidenced on the Cole Cole representation showing an increase of the real viscosity in the low-ω region. In opposition a strong decrease in |η*| is observed for PBAT, underlining a plasticizing effect of the organoclay filler. Comparatively, the thermal stability of PLA is slightly enhanced with an increase of T0.5 value while PBS and PBAT bio-nanocomposites degrade at slightly lower temperature.
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Submitted on : Friday, March 1, 2013 - 10:27:19 AM
Last modification on : Wednesday, November 21, 2018 - 10:54:02 AM

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Mohammed Hennous, Zoubir Derriche, Edwige Privas, Patrick Navard, Vincent Verney, et al.. Lignosulfonate interleaved layered double hydroxide: a novel green organoclay for bio-related polymer.. Applied Clay Science, Elsevier, 2013, 71, pp.42-48. ⟨10.1016/j.clay.2012.10.011⟩. ⟨hal-00795929⟩

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