Electrospun Fiber Compositions for Thermal and Dimensional Stability

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Solution Overview

Problem

Electrospun materials used in medical applications are unstable and undergo significant structural and thermal changes due to crystallization and residual stresses, leading to distortions in fiber topography and mechanical properties.

Innovation Solution

A thermally stable electrospun material is created by combining two independent fiber populations, one thermally unstable and one thermally stable, which are co-mingled and distributed throughout the structure, maintaining physical and mechanical properties under thermal or mechanical stress without additional processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If electrospun materials are used to mimic extracellular matrix topography, then surface area to volume ratio is enhanced for biological interaction, but thermal stability is compromised due to amorphous structure and residual stresses

Engineering Contradiction:

Improvesurface area to volume ratioVSAvoidthermal stability

Core Design Contradiction:

Area of stationary objectVSStability of the object's composition

Solution Approach 1:

The patent combines thermally unstable electrospun fibers with thermally stable fibers to create a composite material system. The thermally stable fibers act as a reinforcing network that prevents crystallization and dimensional changes in the thermally unstable fibers when exposed to heat, thereby achieving both high surface area to volume ratio and improved thermal stability simultaneously

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If high voltage is applied to overcome surface tension during electrospinning, then fiber formation is achieved, but internal stresses are imparted into the resulting fibers

Engineering Contradiction:

Improvefiber formationVSAvoidinternal stress

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The thermally stable fibers serve as an intermediary structural framework that accommodates and distributes the internal stresses generated during electrospinning of the thermally unstable fibers. This intermediary network prevents stress concentration and crystallization in the thermally unstable fibers, maintaining structural integrity without requiring additional stress relief processing

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If rapid evaporation of solvent occurs during electrospinning, then fiber formation is achieved in milliseconds, but polymer crystallization is inhibited

Engineering Contradiction:

Improvefiber formation speedVSAvoidcrystallization state

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The thermally stable fibers are incorporated into the electrospun material before thermal exposure, creating a pre-established stable framework. This preliminary structural preparation ensures that when the material is subsequently exposed to heat, the thermally unstable fibers are constrained from crystallizing, as the stable fiber network prevents the necessary molecular reorganization

Inventive Principle:

Principle #10Preliminary action

4Stress or pressure

If electrospun materials are exposed to thermal treatments, then stress relief is achieved, but fiber topography is distorted and shrinkage occurs

Engineering Contradiction:

Improvestress reliefVSAvoidfiber topography

Core Design Contradiction:

Stress or pressureVSShape

Solution Approach 1:

The thermally stable fibers form a flexible yet dimensionally stable network that acts as a confining structure for the thermally unstable fibers. When thermal stress relief is applied, the stable fiber network allows controlled relaxation while maintaining overall dimensional stability and preventing excessive shrinkage and topographic distortion through its structural framework

Inventive Principle:

Principle #30Flexible shells and thin films

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 combined fiber populations provide thermal stability and minimize macroscopic changes, maintaining structural integrity and mechanical properties, even under conditions relevant to medical applications such as 37°C and 50°C.

Implementation Method 1

the electrospinning method, using an electrical charge to draw very fine, typically on the micro or nano scale, fibers from a liquid

Methodology Applied

Scientific EffectElectrostatic force: Electrostatics

Implementation Method 2

By applying a critical voltage to overcome the surface tension of the polymer solution

Methodology Applied

Scientific EffectSurface tension: Surface Tension

Implementation Method 3

fiber formation occurs on the order of milliseconds due to the rapid evaporation of the solvent, inhibiting polymer crystallization

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 4

a minor fiber component comprising at least one thermally stable species which restrains the major fiber population from undergoing macroscopic changes

Methodology Applied

Scientific EffectThermal stability:

Data Source

PatentUS20250290233A1Thermally and Dimensionally Stabilized Electrospun Compositions and Methods of Making Same

Publication Date: 2025.09.18 POLY MED INC

AI summary

Thermally stable absorbable fiber populations, i.e. fiber populations that do not undergo thermally induced crystallization, can be intermixed with thermally unstable fibers to yield a stabilizing effect without altering morphological properties of a fiber system. Via this, one may minimize thermally induced shrinkage and maintain physical properties of electrospun materials in the as-formed state.