Kazunobu Yamada

New polylactide-layered silicate nanocomposites. 2. Concurrent improvements of material properties, biodegradability and melt rheology

Abstract Our continuing research on the preparation, characterization, materials properties, and biodegradability of polylactide (PLA)-layered silicate nanocomposites has yielded results for PLA–montmorillonite nanocomposites. Montmorillonite modified with trimethyl octadecylammonium cation was used as an organically modified layered silicate for the nanocomposites preparation. The internal structure of the nanocomposites in the nanometer range has been established by using wide-angle X-ray diffraction and transmission electron microscope analyses. All the nanocomposites exhibited superior improvement of practical materials properties such as storage modulus, flexural modulus, flexural strength, heat distortion temperature, and gas barrier property as compared to that of neat PLA. The biodegradability of neat PLA and a representative nanocomposite was also studied under compost, and the rate of biodegradation of neat PLA significantly increased after nanocomposites preparation. The melt rheology of neat PLA and various PLACNs was also studied.

New polylactide/layered silicate nanocomposites, 4. Structure, properties and biodegradability

Our exhaustive research on the preparation, characterization, materials properties and biodegradability of polylactide (PLA)/organically modified layered silicate (OMLS) nanocomposites has yielded results for PLA/montmorillonite (MMT) nanocomposites. Natural Na+-MMT modified with octadecylammonium cation, is used as an OMLS for nanocomposites preparation. The internal structure of the nanocomposites at the nanometer scale is established using wide-angle X-ray diffraction (WAXD) patterns and transmission electron micrographic (TEM) observations. All nanocomposites show improved material properties and crystallization behavior with a simultaneous improvement in biodegradability than that of neat PLA.