Silica Silicate Fiber Composite Interfacial Modifier

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Solution Overview

Problem

Developing thermoplastic composite materials with high fiber loadings faces challenges such as fiber damage, thermal depolymerization, and poor processing characteristics, limiting the achievement of enhanced thermal, tensile, and structural properties, especially at elevated temperatures.

Innovation Solution

A composite material comprising interfacially modified silica and silicate fibers coated with an organo-metallic interfacial modifier, which improves fiber-polymer compatibility, packing efficiency, and processing conditions, allowing for higher fiber loadings without compromising fiber integrity and achieving superior structural properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If high fiber loadings (>40 vol.%) are used to improve structural properties and reduce thermal expansion, then the composite achieves enhanced tensile strength and modulus, but processing becomes difficult due to poor fiber-polymer compatibility and excessive compounding requirements

Engineering Contradiction:

Improvetensile strengthVSAvoidprocessing ease

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

An organo-metallic interfacial modifier is introduced as an intermediary substance between the inorganic fiber surface and the organic polymer matrix. This modifier contains both inorganic-binding groups (such as silanes or metal oxides) that attach to the fiber surface and organic functional groups (such as carboxylic acids, esters, or amides) that are compatible with the polymer, thereby improving interfacial adhesion and reducing the need for excessive compounding processing

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The surface chemistry parameters of the fiber are modified by applying an interfacial modifier coating that changes the surface energy, wettability, and chemical reactivity of the fiber. This parameter change enables better compatibility with the polymer matrix at high fiber loadings, allowing processing without fiber damage or thermal depolymerization

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If excessive compounding processing is applied to achieve uniform composite at high fiber loadings, then fiber distribution improves, but fiber damage and thermal depolymerization occur with fire and toxic gas hazards

Engineering Contradiction:

Improvefiber distribution uniformityVSAvoidfiber damage and thermal depolymerization

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The interfacial modifier acts as a protective intermediary layer that reduces direct contact and friction between fibers during compounding, minimizing mechanical damage. It also stabilizes the polymer-fiber interface during thermal processing, preventing thermal depolymerization and reducing fire and toxic gas hazards

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The fiber surfaces are pre-modified with interfacial modifiers before composite fabrication. This preliminary action creates a protective coating that prevents fiber damage during subsequent compounding and processing operations, eliminating the need for excessive processing to achieve uniform distribution

Inventive Principle:

Principle #10Preliminary action

3Reliability

If standard fiber coatings are used to protect fiber during processing, then fiber integrity is maintained, but fiber-polymer compatibility remains poor and processing difficulties persist

Engineering Contradiction:

Improvefiber integrityVSAvoidprocessing ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The fiber coating is designed with local quality differentiation: the inner layer provides protective functions for fiber integrity during handling and processing, while the outer layer contains organic functional groups that provide compatibility with the polymer matrix. This multi-functional coating structure resolves both fiber protection and compatibility requirements

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The fiber coating itself is made as a composite material combining inorganic protective components (for fiber integrity) and organic compatible components (for polymer compatibility). This composite coating structure enables simultaneous achievement of fiber protection and improved processing ease

Inventive Principle:

Principle #40Composite materials

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 composite exhibits improved tensile properties, modulus, and thermal stability, enabling the production of high-strength structural members suitable for applications in construction, such as decking and fenestration units, with reduced coefficient of thermal expansion.

Implementation Method 1

an interfacial modifier (IM) coated silica and a silicate fiber and a polymer has improved and novel properties

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS11479665B2Silica and silicate blended fiber polymer composite

Publication Date: 2022.10.25 TUNDRA COMPOSITES LLC

AI summary

The claimed material relates to a mixed silica and silicate fiber and polymer composite having enhanced modulus, viscoelastic and rheological properties.