Influence of anionic surface modifiers on the thermal stability and mechanical properties of layered double hydroxide/polypropylene nanocomposites

Abstract

Organo-layered double hydroxide/polypropylene (LDH/PP) nanocomposites were successfully synthesized via a solution blending method. As an attempt to improve the compatibility with hydrophobic PP, the LDH surface was modified by the incorporation of various anionic surfactants via electrostatic interaction with LDH cationic layers. Surfactants were selected by considering the aliphatic carbon chain length (laurate, palmitate, stearate and dodecyl sulfate) and anionic functional groups (-COO À , -OPO 3 2À , and -OSO 3 À ) with the purpose of optimizing the homogeneous dispersion in the PP matrix. In PP nanocomposites containing LDH modified with alkyl carboxylate, the (00l) X-ray diffraction (XRD) peaks originating from organo-LDH were not observed, indicating that organo-LDH layers were fully exfoliated and homogeneously dispersed within the PP matrix, which were also confirmed by cross-sectional TEM analysis. However, PP nanocomposites containing LDH modified with dodecyl sulfate and lauryl phosphate showed broad (00l) XRD peaks, indicating that organo-LDH was partially exfoliated.According to the thermogravimetric analysis, the thermal stability (T 0.5 ) of organo-LDH/PP nanocomposites was significantly improved by 37-60 K, depending on the type and loading content of organo-LDH compared to that of pristine PP. PP nanocomposites containing well-dispersed organo-LDH showed substantial enhancement of the elastic modulus with little decrease of tensile strength.These results are due to the increased interface volume fraction provided by the exfoliated LDH nanosheets.

The Role of Organomodified Different LDHs on Recycled Poly(ethylene terephthalate) Nanocomposites

“…The bands at 644 and 780 cm −1 represent MgO and ZnO stretching vibrations, respectively. The bands at 947, 790, and 554 cm −1 can be assigned to the AlO stretching modes . From Figure (b), (d), and (f), it can be seen that, because of SAS incorporation into the LDH interlayer, stronger absorption peaks due to aromatic compound bands appear at 1633–1462 cm −1 ; the bands at 1032, 1132, and 1160 cm −1 were the vibrations due to the sulfanilic anion functional group .…”

“…Finding proper methods of recycling poses a new challenge from the ecological and economic points of view. In particular, only a few studies on recycled PET recovery for the purpose of nanocomposite materials with improved processing and utility properties are found in the literature . Generally, three preparation methods are used for polymer nanocomposites: in situ polymerization, solution mixing, and melt mixing.…”

The influence of filler surface modification on mechanical and material properties of layered double hydroxide‐containing polypropylene composites

“…The addition of 3 wt % of LDHs increased the crystallinity of PP and the thermal stability of the nanocomposites and decreased flammability . Yang et al . investigated the influence of anionic surface modifiers on the thermal stability and mechanical properties of PP/LDH nanocomposites.…”

Fabrication of Electrochemical Sensor Based on Layered Double Hydroxide/Polypyrrole/Carbon Paste for Determination of an Alpha‐adrenergic Blocking Agent Terazosin

“…In order to increase compatibility of inorganic LDHs with conductive polymer chains (e. g. Polypyrrole (Ppy)), the hydrophobic surface properties of LDHs were necessary. These hydrophobic properties could be achieved by intercalating anionic surfactants with hydrophobic aliphatic carbon chains such as dodecyl sulfate .…”