Morphology and thermal properties of poly(L‐lactic acid)/organoclay nanocomposites

Abstract

A modified clay was used to prepare poly(L-lactic acid)/clay nanocomposite dispersions. X-ray diffraction and transmission electron microscopy experiments revealed that poly(L-lactic acid) was able to intercalate the clay galleries. IR spectra of the poly(L-lactic acid)/ clay nanocomposites showed the presence of interactions between the exfoliated clay platelets and the poly(L-lactic acid). Thermogravimetric analysis and differential scanning calorimetry were performed to study the thermal behavior of the prepared composites. The properties of the poly(L-lactic acid)/clay nanocomposites were also examined as functions of the organoclay content. The exfoliated organoclay layers acted as nucleating agents, and as the organoclay content increased, the crystallization temperature increased.

Enzymatic Hydrolysis of Polylactic Acid Fiber

“…Figure 9 shows the FT-IR spectra of untreated and lipase-treated PLA nonwovens under optimal hydrolysis conditions. The FT-IR spectra of untreated PLA nonwovens show a peak assigned C=O stretching band at 1,750 cm −1 indicating the carbonyl group, and the FT-IR spectra of the PLA fiber exhibits broad peaks at 2,800-3,000 cm −1 assigned to the aliphatic group, which corresponds with previous work [20]. The transmittance (percent) decreased as the C=O combination hydrolyzed.…”

Poly(lactic acid)/layered silicate nanocomposite films: Morphology, mechanical properties, and effects of γ‐radiation

“…Addition of natural clay into polymer matrix very rarely leads to formation of nanocomposites because of incompatibility between inorganic/organic systems. 11 To enhance miscibility between two components, hydrated cations (Ca 2+ , Na + ) of the interlayer space of montmorrilonite are exchanged with cationic surfactants such as alkylammonium or alkylphsphonium. The ion‐exchange reaction lowers the surface energy of inorganic material and makes it compatible with polymers.…”

Multifunctional nanobiocomposites of biodegradable polylactide and nanoclay

“…In recent years, a number of authors reported similar thermal stability improvements for clay-containing nanocomposites of PLA [17,18,27,28,43,48,74,80]. However, Wu et al [44] reported a completely different observation.…”

“…Over the last few years, a number of articles have been published on the TG analysis of neat PLA and various clay-containing nanocomposites of PLA [17,18,20,21,[27][28][29][30]34,35,43,44,48,74,80,81]. For example, Pluta et al [81] compared the thermal stability of MMT microcomposites (MC(Q), prepared with pure MMT and Na + -MMT) and nanocomposites (NC(Q), prepared with dimethyl 2-ethylhexyl hydrogenated tallow alkylammonium modified MMT).…”