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

• US 20030183517A1
• Filed: 03/26/2003
• Published: 10/02/2003
• Est. Priority Date: 03/27/2002
• Status: Abandoned Application

• Current Assignee: Mettler-Toledo AG (Mettler-Toledo International Inc.)
• Original Assignee: Mettler Toledo GmbH
• Inventors: Ehrismann, Philippe, Thrier, Rolf
• Application Number:
  US10/396,401
• Publication Number:
  US 20030183517A1
• Time in Patent Office: Days
• US Class Current: 204/296
• CPC Class Codes: G01N 27/301 Reference electrodes

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 OR₁ and NR₂R₃, in which R₁, R₂ and R₃ 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.

Claims

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 OR₁ and NR₂R₃, and R₁, R₂ and R₃ 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 —

CH₂—

CH₂OH—

CH₂—

NR₂R₃ or a —

CH₂—

CH₂—

NR₂R₃—

CH₂OH, in which R₂ and R₃ are as defined in claim 1.

9. The polymer electrolyte of claim 1, wherein the substituted alkyl group is a —

CH₂—

CH₂OH—

CH₂—

OR₄ or a —

CH₂—

CH₂—

OR₄—

CH₂OH, in which R₄ 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.