Time domain nuclear magnetic resonance study of dynamic properties of gelatin-chitosan blends based polymer electrolyte

• Grant number: 12/02775-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: April 01, 2012
• End date: March 31, 2013
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Caio Eduardo de Campos Tambelli
• Grantee: Marcos Rafael Buzolim Gazzola
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil

Abstract

This work report the study of the ionic transport properties of polymer systems with special attention to polymer electrolytes obtained from natural polymers. The natural polymers, such as chitosan, agar, gelatin, starch, and cellulose derivatives, have been drawing attention because of its specific properties, such as biodegrability, low cost and good physical and chemical properties. Will be used the nuclear magnetic resonance (NMR) applied to the study the electrolyte of gelatin-chitosan blends-based polymer. The study of time-domain NMR-TD will be realized by using inversion-recovery and CPMG (Carr - Purcell - Meiboom - Gill) pulse sequences to obtain the 1H spin-lattice (T1) and spin-spin (T2) relaxation times, respectively. Due to the structural complexity found in these natural polymers, the magnetization decay obtained from NMR experiments usually shows a multi-exponentials form that could be interpreted by a continuous distribution of relaxation times. These analysis data will allow obtaining information about the structural and molecular mobility of protons in these materials.(AU)