Evaluation of PHB/Clay nanocomposite by spin-lattice relaxation time

Materials Research

Mariana Bruno¹  Maria Inês Bruno Tavares¹  Leandro Medeiros Motta¹  Eduardo Miguez¹  Monica Preto¹  Amanda Oliveira Rodriguez Fernandez¹ 

[1] ,Universidade Federal do Rio de Janeiro Instituto de Macromoléculas Professora Eloisa Mano - IMA Centro de TecnologiaRio de Janeiro RJ ,Brazil

关键词: NMR;    PHB;    Nanocomposite;   

DOI  :  10.1590/S1516-14392008000400018

来源: SciELO

【 摘 要 】

Poly(3-hydroxybutyrate) (PHB) based on nanocomposites containing different amounts of a commercial organically modified clay (viscogel B7) were prepared employing solution intercalation method. Three solvents, such as: CHCl3, dimethylchloride (DMC) and tetrahydrofuran (THF) were used. The relationship among the processing conditions; molecular structure and intermolecular interaction, between both nanocomposite components, were investigated using a nuclear magnetic resonance (NMR), as a part of characterization methodology, which has been used by Tavares et al. It involves the hydrogen spin-lattice relaxation time, T1H, by solid state nuclear magnetic resonance, employing low field NMR. X ray diffraction was also employed because it is a conventional technique, generally used to obtain the first information on nanocomposite formation. Changes in PHB crystallinity were observed after the organophilic nanoclay had been incorporated in the polymer matrix. These changes, in the microstructure, were detected by the variation of hydrogen nuclear relaxation time values and by X ray, which showed an increase in the clay interlamelar space due to the intercalation of the polymer in the clay between lamellae. It was also observed, for both techniques, that the solvents affect directly the organization of the crystalline region, promoting a better intercalation, considering that they behave like a plasticizer.

【 授权许可】

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