PVDF-PPy Composite for Tissue Regeneration

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Solution Overview

Problem

Current biomedical applications lack effective electroactive materials that can synergistically combine piezoelectric and conducting polymers for enhanced tissue regeneration, drug delivery, and biosensors, as existing materials face limitations in piezoelectricity, conductivity, and controlled drug release.

Innovation Solution

Development of electroactive materials comprising poly(vinylidene fluoride) (PVDF) coated with polypyrrole (PPy) using electrochemical polymerization, which enables controlled release of therapeutic substances and mechanical stimulation upon electrical potential, leveraging the piezoelectric properties of PVDF and conductivity of PPy for tissue engineering and regenerative medicine.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If PVDF is used as piezoelectric polymer, then piezoelectric properties are improved, but conductivity is worsened

Engineering Contradiction:

Improvepiezoelectric propertiesVSAvoidconductivity

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent creates a composite material system where PVDF (piezoelectric polymer) is combined with PPy (conducting polymer) through surface coating. This composite structure allows the PVDF to provide piezoelectric properties while the PPy coating provides the necessary conductivity, thus resolving the contradiction between piezoelectric performance and electrical conductivity

Inventive Principle:

Principle #40Composite materials

2Power

If PVDF is used as piezoelectric polymer, then piezoelectricity is improved, but hydrophobicity increases

Engineering Contradiction:

ImprovepiezoelectricityVSAvoidhydrophobicity

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The PPy coating forms a composite structure with PVDF that modifies the surface properties. The conducting polymer layer reduces the hydrophobicity of PVDF while maintaining the underlying piezoelectric polymer's piezoelectric properties, thus resolving the contradiction between piezoelectricity and hydrophobicity

Inventive Principle:

Principle #40Composite materials

3Reliability

If electrochemical polymerization is used to coat PPy on PVDF, then conductivity is improved, but manufacturing complexity increases

Engineering Contradiction:

ImproveconductivityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces traditional mechanical or physical coating methods with electrochemical polymerization. This chemical approach allows for in-situ formation of the PPy coating directly on the PVDF surface, providing better adhesion and controlled conductivity while managing manufacturing complexity through a single-step electrochemical process

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 PVDF-PPy composite achieves controlled and targeted drug delivery with retained bioactivity, providing mechanical stimulation for enhanced tissue regeneration and regenerative medicine applications, while overcoming limitations of hydrophobicity and conductivity in PVDF.

Implementation Method 1

leveraging the piezoelectric properties of PVDF

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

leveraging the piezoelectric properties of PVDF and conductivity of PPy

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11433423B2Electroactive materials comprising a piezoelectric polymer and a conducting polymer

Publication Date: 2022.09.06 BOARD OF RGT THE UNIV OF TEXAS SYST

AI summary

In one embodiment, an electroactive material includes a piezoelectric polymer substrate and a conducting polymer coating provided on the substrate.