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PHB nanostructured: Production and characterization by NMR relaxometry

2015; Elsevier BV; Volume: 49; Linguagem: Inglês

10.1016/j.polymertesting.2015.11.011

1873-2348

Gisele Cristina Valle Iulianelli, Raíza da S. Azevedo, Paulo Sérgio Rangel Cruz da Silva, Maria Inês Bruno Tavares,

Polymer crystallization and properties

Nanostructured materials based on PHB and different types of nanoclay were prepared and characterized as regards changes in the thermal behavior and morphological/structural characteristics. With respect to the thermal degradation profile, the addition of nanoclays to the PHB matrix did not, in general, cause loss of thermal stability. Regarding morphology/structure, X-ray diffraction revealed that the addition of the nanonoclays altered the crystallinity profile of some samples and suggested that the materials containing 1 wt% nanoclay have a predominantly exfoliated structure. In turn, the information obtained by NMR relaxometry provided a more precise and detailed understanding of the nanomaterials' structure, including the systems with 1 wt% nanoclay. The T1H values provided details on the degree of intercalation/exfoliation attained by the different systems, and the domain distribution curves allowed insight into the homogeneity of the systems. According to the NMR relaxometry data, the system formed by PHB/S7 presented the best exfoliated/intercalated relation.