Synthesis and characterization of lactic acid – citric acid copolymers

Florjańczyk, Zbigniew; Chudzik, Agnieszka; Frydrych, Anita; Rucińska, Katarzyna

doi:10.14314/polimery.2017.335

Cited by 1 publication

(1 citation statement)

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“…Because one could expect that larger LAc oligomers should encounter difficulties integrating into the structure of Mt, we selected such processing conditions (e.g., molar ratio of reagents, time and pressure on each stage of the process), as to promote the formation of small LAc oligomers having an average molecular mass less than 1000 g/mol. Our previous studies on the LAc copolymers [ 29 , 30 , 31 , 32 ] indicate that, under such processing conditions, condensation of LAc in the absence of Mt produces LAc oligomers with molar masses 500–1000 g/mol (reactions with CAc, PT, or without additional reagent), or 260 g/mol (condensation with MA).…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Resultsmentioning

confidence: 99%