New Organophilic Montmorillonites with Lactic Acid Oligomers and Other Environmentally Friendly Compounds and Their Effect on Mechanical Properties of Polylactide (PLA).

Katarzyna Rucińska,Maciej Dębowski,Zbigniew Florjańczyk,Tomasz Gołofit,Rafał Malinowski

doi:10.3390/ma14216286

Abstract

New organophilic montmorillonites with oligomers of lactic acid and other compounds such as citric acid, stearic acid, maleic anhydride, pentaerythritol and ε-caprolactone were synthesized. They were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), elemental analysis and swelling capacity in water. In all tested composites, an increase in the montmorillonite interlayer distance resulting from intercalation of the modifying substance in the montmorillonite was found by means of XRD. Elemental analysis and FTIR showed that all of the tested samples contained an organic segment in the montmorillonite structure. TGA studies revealed that composites modified with lactic acid oligomers, stearic acid or ε-caprolactone had the highest thermal stability. They also exhibited the lowest swelling capacity which was 2–3 times lower than that for unmodified sodium montmorillonite. Some preliminary studies on the mechanical properties of PLA/modified montmorillonite are also presented and discussed.

Highlights

It is estimated that such a modified composite, due to the addiphase, which was confirmed by elemental analysis, Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) spectroscopy
The composites modified with lactic acid oligomers, stearic acid, A new organophilic montmorillonite was synthesized andswelling it was modified withinlactic or ε-caprolactone were characterized as having the lowest values, and turn, acid oligomers and other compounds such as citric acid, stearic acid, maleic anhydride, the highest hydrophobicity
The obtained were characterized by Montmorillonites have been modified in ordercomposites to obtain organophilized montmomeans of FTIR

Summary

Introduction

Isomorphic substitution within the layer (for example Al3+ replaced by Fe2+ ) generates negative charges that are counterbalanced by sodium cations located in the gallery. The existence of interlayer cations gives them the ability to absorb water, as a way to increase the distance between the Mt layers. The interlayer spacing can be modified by introducing different cations or molecules into their structure. These capabilities are utilized by introducing various inorganic cations between the Mt layers, which are used as catalytic layer precursors [5] or organic cations, most often derived from quaternary ammonium salts [6]

Objectives

Methods

Results

Conclusion