Multifunctional Porous Poly(vinylidene fluoride)-graft-Poly(butyl methacrylate) with Good Li+ Ion Conductivity

• Published in: Macromolecular chemistry and physics 2011-01, Vol.212 (2), p.134-149
• Main Authors: Samanta, Sanjoy, Chatterjee, Dhruba P., Layek, Rama K., Nandi, Arun K.
• Format: Article
• Language: English
• Subjects: Applied sciences; ATRP; Breaking; Copolymerization; Exact sciences and technology; Exchange resins and membranes; Forms of application and semi-finished materials; graft copolymers; Grafting; Ionic conductivity; Li+ ion conductivity; Mathematical models; mechanical properties; Nuclear magnetic resonance; Organic polymers; Physicochemistry of polymers; Polymer industry, paints, wood; Polyvinylidene fluorides; Pore formation; porous morphology; Preparation, kinetics, thermodynamics, mechanism and catalysts; Spectra; Technology of polymers
• ISSN: 1022-1352; 1521-3935; 1521-3935
• DOI: 10.1002/macp.201000472

PnBMA is grafted on PVDF using ATRP in NMP solution at 90 °C and characterized by means of 1D and 2D NMR. 19F NMR spectra clearly reveal that the attack occurs on the head‐head >CF2 groups. Cast PB films show a honeycomb‐patterned porous microstructure, and the “breath‐figure” model is used to explain pore formation. FT‐IR spectra suggest a supramolecular interaction between >CO groups of PnBMA and >CF2 groups of PVDF. Storage modulus, loss modulus and stress at break decrease with graft conversion, but the strain at break increases significantly. The toughness of the copolymers also increases dramatically (882%). The porous materials can be applied as solid‐state electrolytes (Li+‐doped) with good ionic conductivity (10−5 S · cm−1). Poly(vinylidene fluoride) ‐graft‐poly(butyl methacrylate) (PB) is prepared using ATRP and is characterized by means of 1D, 2D, and 19F NMR. THF‐cast films of PB graft copolymers show a honeycomb‐patterned porous morphology. The storage modulus, loss modulus, and stress at break decrease but the strain at break increased significantly with graft conversion. Li+‐doped PB porous samples show good ionic conductivity (10−5 S·cm−1), three orders of magnitude larger than that of the nonporous analog.