Preparation And Characterization Of Phthalazinone-containing Sulfonated Poly(Arylene Thioether Phosphine Oxide)s Proton Exchange Membrane

Proton exchange membrane fuel cells are a clean and efficient new energy power generation device,which has attracted widespread attention.Among them,proton exchange membranes are one of the key components of fuel cells.At present,Nafion membranes from Du Pont are widely used commercial membranes.However,Nafion membrane has limited its further development due to its shortcomings such as high price,poor methanol resistance,and the rapid decrease in electrical conductivity in high temperature and low humidity environments.Therefore,the sulfonated aromatic polymer proton exchange membrane has become a research hotspot.Phthalazinone-containing sulfonated poly(arylene thioether phosphine oxide)s proton exchange membranes are a class of high-performance polymers.Since the phthalazinone group easily forms hydrogen bonding with the sulfonic acid group,favorable to effectively reduce the swelling,and the phosphine group possess the oxidation resistance,the water retention and the adhesion with organic or inorganic particles,so the polymer proton exchange membrane has excellent performance.In this paper,a series of disulfonated poly(phthalazinone thioether phosphine oxide)(ds PPTPO-x)polymer proton exchange membranes with high ion exchange capacity(IEC)were synthesized by direct polycondensation through monomer structure design.Compared with the 100% sulfonated degree of monosulfonated poly(phthalazinone thioether phosphine oxide)(s PPTPO-100),the comprehensive performance of ds PPTPO-x series membranes is better than s PPTPO-100 membranes.By adjusting the degree of sulfonation and the distribution of the sulfonic acid groups,the dimensional stability and conductivity of the proton exchange membrane can be effectively improved.For example,the ds PPTPO-50 polymer membrane possessed a water absorption rate of 56.97%,a swelling ratio of 14.77%,and a proton conductivity of 0.101 S/cm at 80 °C.Shows good overall performance and has certain application prospects.