Aeronautic Glazing with Nanostructured Acrylic Sheets
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Solution Overview
Problem
Aeronautical glazing faces challenges in maintaining mechanical resistance, transparency, and optical quality under extreme conditions such as bird strikes, low temperatures, and chemical exposure, while existing methods like bi-stretching of acrylic sheets are costly, complex, and prone to dimensional instability at high temperatures.
Innovation Solution
The use of transparent polymers with nanostructured and/or micro- or nanofiller blocks to enhance mechanical properties, allowing for laminated and multiple glazing configurations that do not require extensive stretching, offering improved thermoformability and heat resistance, and featuring a laminated structure with chemically reinforced sheets and specific adhesives for enhanced bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bi-stretching process is applied to acrylic sheets, then mechanical resistance and optical quality are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention changes the fundamental parameter of acrylic sheet production from physical stretching to chemical synthesis with controlled molecular architecture. By incorporating nanostructured blocks and micro/nanofillers during polymerization, the material achieves enhanced mechanical properties without requiring post-production stretching processes, thereby reducing manufacturing complexity while maintaining strength improvements
Solution Approach 2:
The invention creates a composite acrylic material by integrating nanostructured blocks and micro/nanofillers within the polymer matrix. This composite structure provides inherent mechanical reinforcement and crack propagation resistance, eliminating the need for bi-stretching while achieving comparable or superior mechanical resistance with simpler manufacturing
2Strength
If bi-stretching process is applied to acrylic sheets, then mechanical resistance and optical quality are improved, but production time and cost increase
Solution Approach 1:
The invention performs the reinforcement action during the polymerization stage itself, incorporating nanostructured blocks and micro/nanofillers into the acrylic matrix before the material is formed into sheets. This preliminary integration of strengthening elements eliminates the need for subsequent stretching operations, reducing production time while maintaining mechanical resistance improvements
3Strength
If acrylic sheets are stretched, then mechanical resistance is improved, but dimensional stability at high temperatures deteriorates
Solution Approach 1:
The invention changes the reinforcement mechanism from physical orientation of polymer chains (through stretching) to chemical and structural reinforcement through nanostructured blocks and micro/nanofillers. These incorporated structures provide thermal stability by maintaining their integrity at high temperatures, preventing the dimensional instability and de-stretching that occurs with conventionally stretched acrylic sheets
4Ease of manufacture
If conventional acrylic sheets are used, then manufacturing is simple, but mechanical resistance under extreme conditions is insufficient
Solution Approach 1:
The invention develops a composite acrylic material incorporating nanostructured blocks and micro/nanofillers that provide enhanced mechanical resistance under extreme conditions (bird strikes, temperature variations, chemical exposure) while maintaining a relatively simple manufacturing process through direct polymerization, thus balancing ease of manufacture with improved reliability
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 provides aeronautical glazing with improved mechanical resistance, dimensional stability, and increased safety under heat exposure, maintaining optical quality and ease of shaping, suitable for complex transport glazing applications.
Implementation Method 1
containing nanostructured blocks and/or blocks enriched with micro- or nanofillers in their polymer chain to limit crack propagation
Implementation Method 2
they are not prestressed, and offer increased safety in case of exposure to heat (airplane windows for example)... offering improved thermoformability and heat resistance
Implementation Method 3
bonded together by adhesive interlayers
Data Source
AI summary
The invention relates to - an aeronautic glazing comprising at least one sheet of modified acrylic, characterised in that said sheet is associated therein with at least one other sheet of modified acrylic, and/or at least one sheet of polymethyl methacrylate (PMMA) formed by casting, and/or at least one sheet of another transparent polymer such as polycarbonate (PC), and/or at least one sheet of in particular chemically toughened glass, in a laminated and/or multiple glazing; - the application thereof to an aerial vehicle.