Polyether Sulfone Structural Adhesive Films for High-Temperature Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing structural adhesive films used in high-temperature applications, such as aerospace and automotive industries, face challenges in maintaining durability and strength due to the degradation of materials containing C—C double bonds at elevated temperatures, and compatibility issues during the curing process with epoxy components.
Innovation Solution
Development of structural adhesive films comprising a branched or networked polymer reaction product of polyether sulfone polymers with epoxy-functional chemical species, including polyepoxides and amine-terminated branched polytetrahydrofuran polymers, which exclude materials with C—C double bonds, enhancing high-temperature durability and adhesion to metal surfaces through the use of coupling agents and curatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If materials containing C—C double bonds are used in structural adhesive films, then the films can achieve initial toughness and adhesion, but they degrade at elevated temperatures leading to loss of durability and strength
Solution Approach 1:
The patent removes materials containing C—C double bonds from the adhesive formulation entirely. Instead, it uses a combination of polyepoxides and amine-terminated branched polytetrahydrofuran polymers that do not contain vulnerable C—C double bonds, thereby eliminating the degradation pathway while maintaining structural integrity at high temperatures.
Solution Approach 2:
The patent employs a composite polymer system consisting of polyether sulfone polymers combined with reaction products of polyepoxides and amine-terminated branched polytetrahydrofuran polymers. This composite material structure provides both the necessary toughness and high-temperature stability, as each component contributes different properties that complement each other in the final adhesive film.
2Strength
If epoxy-functional chemical species are used to improve adhesion, then bonding strength increases, but compatibility issues arise during the curing process
Solution Approach 1:
The patent modifies the chemical parameters of the epoxy system by using specific ratios of polyepoxides to amine-terminated branched polytetrahydrofuran polymers. This parameter adjustment ensures proper crosslinking density and curing behavior, achieving both high bonding strength and curing process compatibility without adverse reactions or incomplete curing.
Solution Approach 2:
The amine-terminated branched polytetrahydrofuran polymer acts as an intermediary between the polyepoxides and the substrate. It facilitates controlled crosslinking and ensures compatibility during the curing process, preventing adverse reactions while still achieving strong adhesion through the epoxy functional groups.
3Strength
If coupling agents are added to enhance adhesion to metal surfaces, then bonding capability improves, but formulation complexity increases
Solution Approach 1:
The amine-terminated branched polytetrahowfuran polymer serves multiple functions simultaneously: it provides structural backbone for the polymer network, contributes epoxy functional groups for crosslinking, and offers amine groups that can interact with metal surfaces. This multi-functionality reduces the need for separate coupling agents, maintaining adhesion enhancement while limiting formulation complexity.
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 films exhibit improved high-temperature durability and strength, maintaining toughness without degrading like materials with C—C double bonds, and demonstrate enhanced adhesion and bonding capabilities with metal substrates, as evidenced by increased shear and peel strength tests.
Implementation Method 1
a branched or networked polymer which is the reaction product of one or more polyether sulfone polymers with epoxy-functional chemical species
Implementation Method 2
one or more functional groups that may react to form covalent bonds with one or more components of the structural adhesive film and one or more functional groups that bind or associate with metal surfaces
Data Source
AI summary
Structural adhesive films are presented which comprise branched or networked polymers which are the reaction product of one or more polyether sulfone polymers, which may include amine-terminated polyether sulfone polymers and/or hydroxy-terminated polyether sulfone polymers, with epoxy-functional chemical species including the reaction product of one or more first polyepoxides with an amine-terminated branched polytetrahydrofuran polymer. The structural adhesive films may possess high strength, holding power and durability in high-temperature applications.