During the investigations, functionalization of graphene oxide synthesized using modified Hummers' method and its reduced form was performed. Mixtures of graphene oxide and reduced graphene oxide with pimelic acid and calcium hydroxide were prepared for functionalization. During the reaction, the molecules of pimelic acid were attached to the surface of graphene sheets. By forming links between the carboxylic groups of pimelic acid and graphene oxide, the durable connection was achieved. The functionalized graphene oxide and the reduced graphene oxide were used as additives in isotactic polypropylene crystallization. The influence of additives on crystallisation in non-isothermal conditions was examined using polarized optical microscopy and differential scanning calorimetry. The effect of the additives on the polypropylene structure was analysed using wide-angle X-ray scattering. For both functionalized compounds, the nucleating ability towards b-form of polypropylene was detected. Both additives showed the increase in the nucleation rate and promotion of growth of the b-form crystals. Nucleation efficiency similar to other nucleating agents used in the crystallization of the b-form of polypropylene was revealed.
Introducing collagen the basic ingredient of bone tissue into the structure of chitosan gels that are formed at physiological body temperature, aims to create so-called biomimetic structures, which are close in composition to the natural composition of bone tissue. The aim of this study was to determine the influence of mineralization on the structural properties of thermosensitive chitosan-collagen gels containing alkaline phosphatase (ALP) by SEM, XRD FTIR and XPS analyses, compared to the previously presented structure of chitosan-collagen gels before mineralization.
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