PHB nanostructured: Production and characterization by NMR relaxometry

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• 作者：Gisele C. Valle Iulianelli ; Raí ; za da S. Azevedo ; Paulo Sé ; rgio R.C. da Silva ; Maria In&ecirc ; s B. Tavares ; ^{mibtima@bol.com.br" class="auth_mail" title="E-mail the corresponding author}
• 关键词：PHB ; Thermal analysis ; NMR ; Relaxometry
• 刊名：Polymer Testing
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：49
• 期：Complete
• 页码：57-65
• 全文大小：929 K

文摘

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.