Block Copolymer Vertical Alignment via Halogen Bonding
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Solution Overview
Problem
Existing block copolymers face challenges in achieving vertical alignment on various substrates without pre-treatment, and their phase separation properties are limited in terms of size and shape control, which hampers their application in nanostructured materials and devices.
Innovation Solution
A block copolymer with specific molecular weight and structural parameters, including a first block with an aromatic structure and a second block with halogen atoms, exhibits improved phase separation and vertical aligning properties, allowing for controlled nanostructure formation on both hydrophobic and hydrophilic surfaces through thermal annealing, as confirmed by XRD and GISAXS analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional block copolymers are used, then basic phase separation occurs, but vertical alignment on diverse substrates without pre-treatment cannot be achieved and size/shape control is limited
Solution Approach 1:
The patent applies local quality by introducing specific functional groups at different locations within the block copolymer structure. The first block contains aromatic rings for pi-pi stacking interactions, while the second block contains halogen atoms for halogen bonding. This localized functional differentiation enables the copolymer to achieve vertical alignment on diverse substrates through specific molecular interactions, resolving the contradiction between alignment precision and substrate compatibility.
Solution Approach 2:
The patent creates a composite block copolymer system combining two distinct polymer blocks with different functional groups. The first block (aromatic-containing) and second block (halogen-containing) work synergistically to provide both vertical alignment capability and broad substrate compatibility. This composite structure allows the material to function effectively across multiple substrate types without pre-treatment.
2Manufacturing precision
If block copolymer parameters are not controlled, then synthesis is simpler, but nanostructure size and shape control is poor
Solution Approach 1:
The patent applies parameter changes by establishing specific ranges for molecular weight (5,000-100,000 g/mol), aromatic ring count (1-10 per block), and halogen atom count (1-10 per block). These controlled parameters directly influence the self-assembly behavior and nanostructure formation. By optimizing these parameters, the patent achieves precise control over nanostructure size and shape while maintaining feasible synthesis procedures through established polymerization techniques.
3Manufacturing precision
If thermal annealing is not applied, then processing time is shorter, but vertical alignment and phase separation are insufficient
Solution Approach 1:
The patent applies preliminary action by incorporating functional groups (aromatic rings and halogen atoms) into the block copolymer structure before the phase separation process. These pre-installed functional groups create inherent driving forces for vertical alignment and phase separation, which are then activated during thermal annealing. This preliminary structural preparation reduces the annealing time required compared to conventional block copolymers without such functional groups.
Solution Approach 2:
The patent utilizes phase transitions during thermal annealing to achieve vertical alignment. The thermal energy enables the block copolymer to undergo phase separation and reorganize into vertically aligned structures through controlled heating and cooling cycles. The functional groups facilitate this phase transition process, allowing high-quality alignment to be achieved within a practical time frame.
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 block copolymer demonstrates enhanced self-assembling and phase separation capabilities, enabling the formation of vertically aligned nanostructures on diverse substrates with precise size and shape control, suitable for advanced applications in nanotechnology and pattern formation.
Implementation Method 1
the block copolymer satisfies at least one parameter as described below, the phase-separation can be very effectively occurred, and therefore it can form a nano-scaled structure by a microphase separation
Implementation Method 2
Block copolymers are capable of forming periodically aligned structure such as the sphere, the cylinder or the lamella through phase separations
Implementation Method 3
the vertical alignment may be accomplished with respect to a large area in a short time by a thermal annealing
Data Source
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AI summary
The present application provides the block copolymers and their application. The present application may provide the block copolymers that have excellent self assembling and phase separation properties and therefore that can be effectively used in various applications. The present application may also provide applications of the block copolymers.