Polyether Acrylamide Adhesive for Flexible Electronics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure-sensitive adhesives used in electronic devices fail to maintain adhesion under deformation and traumatic forces, such as bending, folding, and dropping, due to insufficient impact resistance and flexibility, which is critical for modern electronic devices that require durability and thinness.
Innovation Solution
A polymeric adhesive composition derived from a polymerizable mixture containing a polyether (meth)acrylamide macromer with at least 50 mole percent propylene oxide, an alkyl (meth)acrylate, and a crosslinking agent, which forms a strong and flexible adhesive suitable for electronic devices by providing enhanced impact resistance and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pressure-sensitive adhesives are used to bond components in electronic devices, then the adhesives can provide basic adhesion under normal conditions, but they fail to maintain adhesion under deformation and traumatic forces such as bending, folding, and dropping
Solution Approach 1:
The patent employs a composite adhesive system consisting of multiple polymer components with distinct functional roles: a first polymer providing tack and initial bonding, a second polymer contributing to cohesive strength and flexibility, and a crosslinking agent creating a three-dimensional network. This composite structure synergistically combines different material properties to achieve both high impact resistance and reliable adhesion maintenance under deformation and traumatic forces
Solution Approach 2:
The patent systematically adjusts critical adhesive parameters including the glass transition temperature (Tg) of the polymer blend, crosslinking density, and molecular weight distribution. By optimizing these parameters, the adhesive achieves a balance between rigidity (for strength) and flexibility (for deformation tolerance), enabling it to maintain adhesion under both static and dynamic loading conditions
2Strength
If adhesives with high adhesive strength are used to maintain good adhesion, then the adhesives can properly maintain adhesion to components under normal conditions, but they become brittle and fail under traumatic forces such as dropping
Solution Approach 1:
The patent creates spatial heterogeneity in the adhesive's mechanical properties through controlled crosslinking. The crosslinked regions provide localized strength and structural integrity, while uncrosslinked or lightly crosslinked regions maintain flexibility and energy absorption capacity. This local differentiation allows the adhesive to simultaneously achieve high adhesive strength and impact resistance
Solution Approach 2:
The adhesive formulation incorporates flexible polymer segments and plasticizers that act as pre-positioned energy dissipation mechanisms. These components are strategically designed to activate during impact events, absorbing traumatic forces before they can propagate to the adhesive-substrate interface, thereby preventing bond failure while maintaining strong adhesion under normal conditions
3Device complexity
If the electronics industry combines layers and reduces bonding area to simplify devices and reduce thickness, then device complexity and thickness are reduced, but adhesive performance under deformation and impact becomes more difficult to maintain
Solution Approach 1:
The patent develops an adhesive formulation specifically optimized for thin-film applications in flexible electronics. The adhesive layer is designed with enhanced flexibility through low-Tg polymer components and controlled crosslinking, allowing it to conform to bent and folded substrates without compromising bond strength. This enables reliable adhesion in ultra-thin device constructions where traditional rigid adhesives would fail
Solution Approach 2:
The multi-polymer composite system provides a tailored combination of properties suitable for simplified device architectures: the first polymer ensures adequate tack for thin substrates, the second polymer provides cohesive strength despite reduced bonding area, and the crosslinking agent creates a durable network that maintains performance in flexible configurations. This composite approach allows successful adhesion in devices with combined layers and reduced thickness
Data Source
AI summary
An adhesive composition, a method of making the adhesive composition, and an article that contains the adhesive composition are provided. The adhesive composition contains a polymeric material that includes a monomeric unit derived from a polyether (meth)acrylamide macromer having a polyether group comprising at least 50 mole percent propylene oxide based on total moles of alkylene oxide in the polyether group. The article includes a layer of the adhesive composition positioned next to a substrate. The articles can be, for example, an adhesive tape or can be part of another article such as, for example, an electronic device that is impact resistant and/or flexible.