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- 저자 : Yazdani-Pedram (검색결과 2 건)
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Mehrdad Yazdani-Pedram,Cristian Menzel,Patricio Toro,Raúl Quijada,Alejandro May-Pat,Francis Avilés 한국고분자학회 2013 Macromolecular Research Vol.21 No.2
Multi-walled carbon nanotubes (CNTs) are functionalized with itaconic acid (IA) and its derivative,monomethylitaconate (MMI), to prepare CNT/isotactic polypropylene (PP) composites. To promote dispersion and improved interactions between functionalized CNTs and the PP matrix, PP grafted with IA (PP-g-IA) is employed as a compatibilizer for the preparation of 1% w/w CNT/PP blends by melt compounding. The role of IA as a functionalizing agent for the CNTs and as a compatibilizer for the fabrication of CNT/PP composites is examined. Improved tensile mechanical properties of the composites were obtained when the CNTs were functionalized with IA, although no significant improvement in mechanical properties was observed when PP-g-IA was used as compatibilizer. The use of a compatibilizer, however, retarded the thermal degradation of the composites. Overall, the composites fabricated with IA-functionalized CNTs yielded better mechanical and thermal properties than those composites with CNTs functionalized by MMI, maybe because of the bifunctionalty and higher polarity of IA.
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A. Neira-Carrillo,M. S. Fernández,J. L. Arias,S. Navarrete G,M. Paz Díaz,M. Yazdani-Pedram 한국고분자학회 2011 Macromolecular Research Vol.19 No.11
Based on polypropylene (PP) grafted with different percentages of maleic anhydride (PP-g-MA) or monomethylitaconate (PP-g-MMI) a new porous scaffold was prepared with porosities in the range of 50-200 μm. The swelling capacity was analyzed, and morphological, mechanical, and elemental analyses of these scaffolds were carried out. In vitro swelling in the simulated body fluid (SBF), chitosan (CHI) of low (70 kDa) and high (350 kDa)molecular weight, and chitosan-hydroxyapatite solutions were assayed at 37 ℃ from 24 h to 4 weeks. The swelling degree (SD) of these scaffolds was in the range of 25%-125%. The highest SD value was found in the low-molecular weight (LMW) chitosan solution. The PP-g-MMI and PP-g-MA with 0.7% and 1% of grafting, respectively, showed the highest SD values in the CHI solution. The in vitro treatment of the scaffold was performed by immersion in LMW chitosan and/or the double ionic diffusion (DID) method. The pore structure of the scaffolds was unaltered after these treatments, as revealed by scanning electron microscopy (SEM). Mechanical properties, that is, fracture resistance and deformation of the porous scaffolds depended on the percentage of grafting. Scaffolds with a smaller pore size showed higher mechanical properties. Energy Dispersive Spectroscopy (EDS) measurements of PP-g-MMI with 0.7% of grafting after in vitro treatment revealed the formation of hydroxyapatite (HA) crystals with different morphologies on the porous scaffold. It was concluded that the porous scaffold based on PP-g-MMI could be used as a potential prototype bone graft.
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