Polymer/organosilica nanocomposites based on polyimide with benzimidazole linkages and reactive organoclay containing isoleucine amino acid: Synthesis,characterization and morphology properties |
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| Authors: | Shadpour Mallakpour Mohammad Dinari |
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| Affiliation: | 1. Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;2. Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;1. Maastricht University, The Netherlands;2. Ghent University, Belgium;3. Ghent University Hospital, Belgium;1. Departamento de Micro y Nanotecnología, Comisión Nacional de Energía Atómica, San Martín, Buenos Aires, Argentina;2. Departamento de Radiobiología, Comisión Nacional de Energía Atómica, San Martín, Buenos Aires, Argentina;3. Gerencia de Investigación y Aplicaciones, Comisión Nacional de Energía Atómica, San Martín, Buenos Aires, Argentina;4. Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina;6. Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina;5. Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, San Martín, Buenos Aires, Argentina;1. Department of Oral Pathology, College of Stomatology, Hebei Medical University, Shijiazhuang, PR China;2. Department of Oral and Maxillofacial Surgery, College of Stomatology, Hebei Medical University, Shijiazhuang, PR China;3. The Key Laboratory of Stomatology, No. 383 East Zhongshan Road, Shijiazhuang 050017, Hebei, PR China;1. Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan;2. Department of Mathematics, Tamkang University, New Taipei City 25137, Taiwan, ROC;3. Department of Materials Science and Engineering, I-Shou University, Kaohsiung City 84001, Taiwan, ROC |
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| Abstract: | Polyimide–silica nanocomposites are attractive hybrid architectures that possess excellent mechanical, thermal and chemical properties. But, the dispersion of inorganic domains in the polymer matrix and the compatibility between the organic and inorganic phases are critical factors in these hybrid systems. In this investigation, a reactive organoclay was prepared via ion exchange reaction between protonated form of difunctional l-isoleucine amino acid as a swelling agent and Cloisite Na+ montmorillonite. Amine functional groups of this swelling agent formed an ionic bond with the negatively charged silicates, whereas the remaining acid functional groups were available for further interaction with polymer chains. Then organo-soluble polyimide (PI) have been successfully synthesized from the reaction of 2-(3,5-diaminophenyl)-benzimidazole and pyromellitic dianhydride in N,N-dimethylacetamide. Finally, PI/organoclay nanocomposite films enclosing 1%, 3%, 5%, 7% and 10% of synthesized organoclay were successfully prepared by an in situ polymerization reaction through thermal imidization. The synthesized hybrid materials were subsequently characterized by Fourier transform infrared spectroscopy, X-ray diffraction, electron microscopy, and thermogravimetric analysis techniques. The PI/organoclay nanocomposite films have good optical transparencies and the mechanical properties were substantially improved by the incorporation of the reactive organoclay. |
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