Effect of organically modified layered double hydroxides on the properties of poly(lactic acid)/poly[(butylene succinate)‐co‐adipate] immiscible blends

Abstract

In this study, poly(lactic acid) (PLA)/poly[(butylene succinate)-co-adipate] (PBSA) blend and its nanocomposites with layered double hydroxides (LDH) containing surface stearic acid functional groups (SaLDH) were prepared using the extrusion method, where the weight ratio of PLA/PBSA was fixed at 80/20, while that of the SaLDH varied from 0.1, 0.5, and 1.0 wt%. The characterization of SaLDH using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Thermogravimetric analysis (TGA) confirmed the presence of stearic acid moieties on the LDH surface. Comprehensive characterization of nanocomposites showed concurrent improvement of the thermal, mechanical, and oxygen gas barrier properties of nanocomposite containing 0.5 wt% of SaLDH. These properties are shown to result from improved interfacial interaction between the polymer matrices and the homogeneous distribution of nanoclay particles obtained at 0.5 wt% SaLDH concentration. The nanocomposite material thus shows high prospects in the industrial development of environmentally sustainable food and cosmetic packaging applications. CO 3 2− , Cl − ); and x is the fractional aluminum substitution in the layers] has a structure similar to that of brucite (Mg(OH) 2 ). 8-10 However, unlike the brucite structure, some of the divalent metal ions are replaced with trivalent metal ions in the LDH structure. Due to the excess positive charge from the trivalent metals ions, LDH layers carry a net positive charge, which is counterbalanced Additional Supporting Information may be found in the online version of this article.

Binary Green Blends of Poly(lactic acid) with Poly(butylene adipate-co-butylene terephthalate) and Poly(butylene succinate-co-butylene adipate) and Their Nanocomposites

“…The maximum elongation at break was reached for 0.5 wt% of nanoclay. This composition also showed improved thermal stability and barrier properties against oxygen transmission [ 124 ].…”

“…Among the layered nanoparticles, nanoclays and especially organo-modified nanoclays have been extensively studied and both the exfoliation degrees and the localization of platelets between the phases by changing the inorganic content, or the kind of organophilic surfactants or the polymer ratios have been investigated to explain their effects on the thermal, mechanical, rheological and barriers features. PLA/PBAT-and PLA/PBSA-based nanocomposites were prepared and studied by dispersing in polymer blends with different composition cationic and anionic nanoclays modified with organophilic surfactants (Table 4) [81,[120][121][122][123][124][125][126][127][128][129][130][131][132][133][134].…”

Improvement of Impact Strength of Polylactide Blends with a Thermoplastic Elastomer Compatibilized with Biobased Maleinized Linseed Oil for Applications in Rigid Packaging

“…Consequently, the final performance of these blends is lower than expected [37,38]. In these cases, the use of a compatibilizer agent is almost mandatory to provide a bridge or coupling effect between the two polymers in the blend [39]. To improve the miscibility between polymers, there are two main techniques: ex situ (non-reactive) or in situ (reactive) compatibilization.…”

Enhancement of Gas Barrier Properties and Durability of Poly(butylene succinate-co-butylene adipate)-Based Nanocomposites for Food Packaging Applications

“…Already at a loading of 2 wt% LDH, the WVTR is decreased by 55% compared to neat PBSA. Like the oxygen gas molecules, the presence of LDH particles reduces the diffusion of water molecules through the nanocomposites due to the impermeable crystalline structure of LDH resulting in a tortuous pathway for the gas molecules [ 15 , 42 ]. Increasing the LDH loading to 5 wt% and 8 wt% resulted in a decrease in WVTR, however to a lesser extent or almost equal WVTR to that of the nanocomposites with 2 wt% LDH.…”