فهرست مطالب مهران جوانبخت

Atom Transfer Radical Polymerization (ATRP) is a beneficial technique for the preparation and design of multifunctional and nanostructured materials for a variety of applications. Macromolecular structure, order and functionality are of the most important factors and considerations in polymer science and ATRP enables precise control over these factors. This method aids synthesizing novel engineering polymeric materials which play an absolutely essential role in all aspects of our lives and there is a “must” to develop new and green methods to synthesize and produce novel materials as best as we can. In this research, we have synthesized novel graft copolymers of PVDF-g-PS and PVDF-g-PSSA via ATRP which have a variety of applications from membranes to Li-Ion batteries. These materials can be used to enhance the properties of Li-ion batteries’ separator operation. The characterization of the final copolymers was performed using Fourier transform infrared spectroscopy (FT-IR) and 1H nuclear magnetic resonance (1H-NMR) analyses. The grafting percentages obtained from 1H-NMR analyses are reported to be 2%, 13% and 44% for PVDF-g-PS (I), PVDF-g-PS (II) and PVDF-g-PSSA copolymer samples, respectively.

Polyvinylidene fluoride (PVDF) is a semicrystalline polymer which has been extensivelyapplied in scientific research and industrial processes owing to its desirable featuressuch as excellent dielectric properties, suitable mechanical resistance, high thermal stability,good chemical resistance. PVDF membranes can be applied in a wide range of applicationsincluding waste water treatment, gas separation, and separator and polymer electrolyte inlithium ion batteries. PVDF-based polymer electrolytes in lithium ion batteries should havelow thickness as well as an appropriate porosity with good mechanical strength and highelectrochemical stability. Applying pristine PVDF based polymer electrolytes may causeinternal short circuit which will influence the performance of the Li-ion batteries. BlendingPVDF with other polymers and incorporation of inorganic fillers have been considered aseffective methods to improve the performance of PVDF-based electrolytes. In this paper,PVDF-based electrolytes and their performance requirements have been investigated. Thefabrication methods of PVDF membranes and the known strategies which are applied toimprove their mechanical and electrochemical characteristics have also been described.Furthermore, the ionic conductivity and electrochemical performance of PVDF-basedlithium-ion batteries are discussed.