Preparation, characterization and properties of polymer electrolyte nanocomposite membranes containing silica nanoparticles modified via surface-initiated atom transfer radical polymerization

摘要: Abstract Hydrophilic sulfonated monomers including styrene sulfonic acid sodium salt (SSA) and 2-acrylamido-2-methyl-1-propane (AMPS) were grafted onto a brominated silica nanoparticle (BSN) as macroinitiator via surface-initiated atom transfer radical polymerization (SI-ATRP) at pH of about 10 in the presence CuBr/bipyridine catalyst/ligand system water/methanol (3/1 v/v) mixture solvent 25 °C for 24 h. To synthesize BSN macroinitiator, (SN) was fist modified with 3-aminopropyltriethoxy silane then reacting 2-bromopropionyl bromide triethylamine/THF solution. Modified SNs characterized by FTIR spectroscopy thermogravimetric analysis (TGA). Grafting percentage calculated from TGA thermograms to be 30.6%, 47.6% (for initial AMPS concentration 0.8 2.0 M, respectively) PAMPS 28.1% SSA 1.2 M) PSSA. The PVA-based nanocomposite membranes containing various amounts pristine prepared solution casting cross-linked 40 °C 15 min an acetone 0.5 M glutaraldehyde 0.12 vol% HCl. SEM photograph X-ray mapping cross-sectional view showed that have homogeneously dispersed nanometric scale PVA matrix. It found ion exchange capacity, water uptake (WU) proton conductivity increase increasing SN, especially polymer-modified loading up 10 wt%. increases grafting monomer SNs. Moreover, similar SNs, higher WU observed membrane SN chains. Results both hydrophilic nature efficiency can play important role membranes. Tensile modulus tensile strength enhanced adding Methanol permeability polymer electrolyte also decreased