Polymer electrolyte, half cell for electrochemical measurements, and the use thereof

Abstract

A polymer electrolyte for an electrochemical half cell, in particular for a reference half cell, contains a polymer which as a first monomer component contains at least one alkyl methacrylate. The alkyl methacrylate has a substituted alkyl group with from three to seven carbon atoms and at least two substituents. The aforementioned substituents are selected from the group comprising OR 1 and NR 2 R 3 , in which R 1 , R 2 and R 3 are selected from the group comprising hydrogen, methyl, and ethyl, on the condition that the substituted alkyl group contains the substituent OH at most once.

1 . A polymer electrolyte for an electrochemical half cell, comprising: 
 a polymer which as a first monomer component contains at least one alkyl methacrylate, wherein the alkyl methacrylate has a substituted alkyl group with from three to seven carbon atoms and at least two substituents, and the substituents are selected from a group comprising OR 1  and NR 2 R 3 , and R 1 , R 2  and R 3  are selected from a group comprising hydrogen, methyl, and ethyl, on a condition that the substituted alkyl group contains a substituent OH at most once.    
     
     
         2 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a 3-amino-2-hydroxypropyl.  
     
     
         3 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a 2-amino-3-hydroxypropyl.  
     
     
         4 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a 3-diethylamino-2-hydroxypropyl.  
     
     
         5 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a 3-ethoxy-2-hydroxypropyl.  
     
     
         6 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a 3-methoxy-2-hydroxypropyl.  
     
     
         7 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a 3-methylamino-2-hydroxypropyl.  
     
     
         8 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a —CH 2 —CH 2 OH—CH 2 —NR 2 R 3  or a —CH 2 —CH 2 —NR 2 R 3 —CH 2 OH, in which R 2  and R 3  are as defined in  claim 1 .  
     
     
         9 . The polymer electrolyte of  claim 1 , wherein the substituted alkyl group is a —CH 2 —CH 2 OH—CH 2 —OR 4  or a —CH 2 —CH 2 —OR 4 —CH 2 OH, in which R 4  is a methyl or ethyl.  
     
     
         10 . The polymer electrolyte of  claim 1 , wherein the polymer contains, as a further monomer component, a hydroxyalkyl methacrylate.  
     
     
         11 . The polymer electrolyte of  claim 1 , wherein the polymer contains, as an additional monomer component, a silylated alkyl methacrylate, preferably 3-(trimethoxysilyl)propyl methacrylate.  
     
     
         12 . The polymer electrolyte of  claim 1 , wherein it additionally contains a concentrated aqueous solution of a salt or salt mixture.  
     
     
         13 . The polymer electrolyte of  claim 1 , wherein it additionally contains a mixture of an organic solvent and an aqueous solution of a salt.  
     
     
         14 . The polymer electrolyte of  claim 13 , wherein the organic solvent is selected from the group comprising glycerine, ethylene glycol, methanol, ethanol, N-propanol, isopropanol, acetone, and mixtures thereof.  
     
     
         15 . The polymer electrolyte of  claim 12 , wherein the salt is additionally in the form of a suspension.  
     
     
         16 . The polymer electrolyte of  claim 12 , wherein the salt is selected from the group comprising potassium chloride, sodium chloride, lithium chloride, potassium nitrate, potassium perchlorate, sodium formiate, lithium acetate, lithium sulfate, ammonium chloride, methylammonium chloride, dimethylammonium chloride, trimethylammonium chloride, and mixtures thereof.  
     
     
         17 . A half cell for electrochemical measurements, comprising: 
 a polymer electrolyte according to  claim 1 .    
     
     
         18 . The half cell of  claim 17 , comprising: 
 an open liquid junction between the polymer electrolyte and a surrounding medium.    
     
     
         19 . The use of the half cell of  claim 17 , as a component in potentiometric or amperometric sensors.  
     
     
         20 . The use of the polymer electrolyte of  claim 1 , as a solid-phase electrolyte in a battery half cell.  
     
     
         21 . The polymer electrolyte of  claim 1 , wherein the electrochemical half cell is a reference half cell.  
     
     
         22 . The polymer electrolyte of  claim 1 , wherein the polymer contains, as a further monomer component, a 2-hydroxyethyl methacrylate and/or 3-hydroxypropyl methacrylate.