Abstract
In this work, phosphonium ionic liquids (ILs) based on tetra-alkylphosphonium cations combined with carboxylate, phosphate and phosphinate anions, were used for organic modification of layered double hydroxide (LDH). Two different amounts (2 and 5 wt %) of the organically modified LDHs were mixed with poly(butylene adipate-co-terephthalate) (PBAT) matrix by melt extrusion. All prepared PBAT/IL-modified-LDH composites exhibited increased mechanical properties (20–50% Young’s modulus increase), decreased water vapor permeability (30–50% permeability coefficient reduction), and slight decreased crystallinity (10–30%) compared to the neat PBAT.
Highlights
In the world of polymer nanocomposites, the continual challenge is to develop high-performance materials at a low cost [1,2,3,4,5]
After anionic exchange with phosphonium ionic liquids (ILs) containing hexanoate, phosphinate, and phosphate anions denoted IL351, IL104, and IL349, the thermal stability of the pure ILs were investigated by thermogravimetric analysis (TGA) (Figure 1)
Phosphonium ILs were used as layered double hydroxide (LDH) interfacial agents to prepare thermally stable LDHs by the extrusion process
Summary
In the world of polymer nanocomposites, the continual challenge is to develop high-performance materials at a low cost [1,2,3,4,5]. For compostable film applications, different composites based on PBAT and different lignocellulose fibers (pupunha, munguba, kenaf fibers) were studied to increase the performances of this matrix [13,14,15]. A vast number of LDH modification methods are available [23], where calcination/rehydration is often a suitable approach. In this case, anionic exchange usually requires two steps composed of an initial calcination step followed by the counter anion intercalation within a solvent medium, where various conventional anions, surfactant adsorbents, and active pharmaceutical ingredients have already been used [24]
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