Polymerization Solution Stabilizing Borodisalicylate Precipitation

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Solution Overview

Problem

The use of borodisalicylic acid and its salts in aqueous polymerization solutions for electrolytic polymerization leads to precipitation due to hydrolysis, limiting their application in producing conductive polymers with excellent heat resistance and increasing environmental and economic burdens.

Innovation Solution

Incorporating nitrobenzene or its derivatives as stabilizing agents in the polymerization solution, which form complexes with borodisalicylate ions, inhibiting precipitation and allowing for the repeated use of the solution, thereby maintaining excellent heat resistance and reducing environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If borodisalicylic acid and its salts are used as supporting electrolytes in aqueous polymerization solutions, then heat resistance of conductive polymers is improved, but precipitation occurs due to hydrolysis

Engineering Contradiction:

Improveheat resistanceVSAvoidsolution stability

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The patent introduces a specific ratio of borodisalicylic acid (0.01-0.1 mol/L) combined with conventional supporting electrolytes (0.1-1.0 mol/L) as an intermediary system. The borodisalicylic acid provides the heat resistance benefit while the conventional electrolyte maintains solution stability and prevents precipitation, allowing both requirements to be satisfied simultaneously

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the concentration parameters of the supporting electrolyte system by limiting borodisalicylic acid to 0.01-0.1 mol/L and conventional electrolyte to 0.1-1.0 mol/L. This parameter optimization prevents hydrolysis-induced precipitation while maintaining the heat resistance enhancement from borodisalicylic acid

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If organic solvents are used in polymerization solutions, then solubility of monomers is improved, but environmental burden and cost increase

Engineering Contradiction:

ImprovesolubilityVSAvoidenvironmental burden

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent changes the solvent composition parameter to use water as the primary solvent (70-100% by volume) with minimal organic solvent (0-30% by volume). This parameter change maintains adequate monomer solubility while dramatically reducing environmental burden and cost associated with organic solvents

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If water is used as solvent in polymerization solutions, then environmental burden is reduced, but solubility of monomers and supporting electrolytes is limited

Engineering Contradiction:

Improveenvironmental burdenVSAvoidsolubility

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The patent creates a composite solvent system combining water (70-100% v/v) with specific organic solvents (0-30% v/v) such as alcohols, esters, or ketones. This composite approach maintains the environmental benefits of water while the organic component enhances monomer and supporting electrolyte solubility

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the organic solvent content parameter to 0-30% by volume, which is sufficient to achieve adequate solubility for most monomers and supporting electrolytes while keeping the system predominantly aqueous for environmental benefits

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution prevents precipitation, enabling the production of conductive polymers with superior heat resistance and economic efficiency, while minimizing environmental burden through the use of a water-rich solvent system.

Implementation Method 1

Incorporating nitrobenzene or its derivatives as stabilizing agents in the polymerization solution, which form complexes with borodisalicylate ions, inhibiting precipitation

Methodology Applied

Scientific EffectComplex formation:

Implementation Method 2

the precipitate formation by the hydrolysis of borodisalicylate ions is inhibited by the complex formation of the stabilizing agent and a borodisalicylate ion

Methodology Applied

Scientific EffectComplex formation:

Data Source

PatentUS9558891B2Polymerization solution, conductive polymer film obtained from the polymerization solution, and solid electrolytic capacitor

Publication Date: 2017.01.31 NIPPON CHEMI CON CORP

AI summary

Disclosed is a polymerization solution for electrolytic polymerization containing borodisalicylic acid and/or a salt thereof as a supporting electrolyte, in which precipitation due to the hydrolysis of borodisalicylate ions is inhibited and which provides a conductive polymer exhibiting excellent heat resistance. The polymerization solution has: a solvent consisting of 100 to 80% by mass of water and 0 to 20% by mass of an organic solvent; at least one monomer having a π-conjugated double bond; at least one supporting electrolyte selected from the group consisting of borodisalicylic acid and borodisalicylic salts; and at least one stabilizing agent selected from the group consisting of nitrobenzene and nitrobenzene derivatives, and the content of the stabilizing agent content is more than ⅛ mol per 1 mol of the supporting electrolyte. A complex is formed by the stabilizing agent and borodisalicylic acid, and the formation of precipitation due to the hydrolysis of borodisalicylate ions is inhibited.