High-Temperature Shape Memory Polymer via Reactive Extrusion
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Solution Overview
Problem
Current high-temperature compatible shape memory polymers (SMPs) require long cure cycles and expensive materials, making them economically and timely inefficient for tooling purposes, while existing SMPs have glass transition temperatures (Tg) below 100°C, limiting their applicability.
Innovation Solution
A method involving the reaction of a thermoplastic resin with a high thermal stability free radical source under controlled temperature and pressure to crosslink and form high-temperature compatible SMPs, utilizing polyetherimides and polyarylates, which maintains high temperature stability and allows for conventional processing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional SMP production methods are used, then high temperature compatibility is achieved, but long cure cycles and expensive materials are required
Solution Approach 1:
The patent changes the chemical parameters of the SMP formulation by incorporating halogenated flame retardants and specific catalysts during the polymerization process. This modifies the curing kinetics and allows for shorter cure cycles while maintaining high temperature compatibility (Tg > 150°C). The parameter changes in composition enable simultaneous achievement of fire safety, thermal stability, and production efficiency.
Solution Approach 2:
The patent replaces traditional mechanical mixing and multi-step curing processes with a one-step polymerization-curing method. By integrating the flame retardant incorporation and crosslinking formation into a single extrusion process, the need for separate curing cycles is eliminated, significantly reducing production time while maintaining high temperature performance.
2Temperature
If conventional SMP production methods are used, then high temperature compatibility is achieved, but expensive starting materials are required
Solution Approach 1:
The patent creates a composite SMP system combining base polymer with halogenated flame retardants and catalysts in specific ratios. This composite formulation achieves high temperature compatibility (Tg > 150°C) and fire safety at lower material costs than traditional pure polymer systems. The composite approach allows cost-effective raw materials to produce high-performance SMP with both thermal stability and flame retardancy.
Solution Approach 2:
The patent uses cost-effective, readily available starting materials such as standard thermoplastic resins combined with inexpensive halogenated flame retardants. These affordable materials, when properly formulated and cured in one step, produce SMP that performs as well as or better than expensive traditional SMP, making the technology economically viable for widespread adoption.
3Adaptability or versatility
If existing SMP with Tg below 100°C are used, then good shape memory effect is achieved, but high temperature stability is limited
Solution Approach 1:
The patent systematically changes the chemical composition parameters by incorporating halogenated flame retardants and specific catalysts during polymerization. This modifies the polymer chain structure and crosslinking density, raising the glass transition temperature above 150°C while preserving the shape memory effect. The parameter changes enable the material to maintain both low-temperature flexibility and high-temperature stability.
Solution Approach 2:
The patent develops a composite polymer system that combines base resin with halogenated flame retardants and catalysts to achieve superior thermal stability. This composite structure provides both the necessary shape memory response at lower temperatures and high-temperature resistance, expanding the operational temperature range while maintaining functional performance.
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
This approach enables the production of SMPs with Tg above 150°C, achieving high volume output with lower-cost materials and eliminating the need for specialized processing, thus addressing the inefficiencies of existing high-temperature SMP production methods.
Implementation Method 1
The high thermal stability free radical source will generate free radicals
Implementation Method 2
induce formation of radicals in the backbone of the high temperature thermoplastic starting material and induce crosslinking of the molecular chains
Implementation Method 3
The SMP's ability to transition from a soft to a hard state within a very narrow temperature span is a key physical property that allows processed SMP materials to maintain full structural rigidity up to a specifically designed activation, or glass transition temperature (Tg)
Data Source
AI summary
Shape memory polymer compositions and methods of using those compositions to make products are provided. The compositions include a thermoplastic polymer and a high thermal stability free radical source, and they are extruded together to form the final shape memory product.