Block Copolymer Composition for Thermodynamically Stable 4-Fold Networks
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Solution Overview
Problem
Existing block copolymers with 4 or more-fold network structures face challenges in achieving a thermodynamically stable state, particularly diamond and plumber's nightmare structures, which are theoretically possible but difficult to stabilize.
Innovation Solution
Introducing a double terminal substituent to a block copolymer, such as polystyrene-b-polyethylene oxide or polystyrene-b-polymethylbutylene, with specific chemical structures represented by Chemical Formulae 1 and 2, to form stable 4 or more-fold network structures like diamond or plumber's nightmare structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a block copolymer network structure with 4 or more channels intersecting is formed, then mechanical and electrical properties are improved by double continuous nanodomain, but the structure cannot exist in a thermodynamically stable state
Solution Approach 1:
The invention changes the chemical parameters of the block copolymer by introducing specific terminal functional groups (carboxyl, hydroxyl, amine, or isocyanate groups) at the ends of the copolymer chains. This parameter modification enables the formation of thermodynamically stable 4-fold or 6-fold network structures through intermolecular interactions between these terminal groups, resolving the contradiction between achieving complex network structures and maintaining thermodynamic stability
Solution Approach 2:
The invention creates a composite structure where the block copolymer forms a network architecture with multiple continuous nanodomains (4-fold or 6-fold intersections). This composite nanodomain structure combines different material phases (glassy and rubbery blocks) in a specific spatial arrangement that simultaneously provides enhanced mechanical/electrical properties and thermodynamic stability through the double continuous phase morphology
2Strength
If diamond and plumber's nightmare structures with 4 or more channel intersections are developed, then next-generation high-performance material properties are achieved, but these structures exist only theoretically to date
Solution Approach 1:
The invention modifies the molecular parameters of the block copolymer by controlling the molecular weight ratio between glassy and rubbery blocks (within specific ranges) and introducing terminal functional groups. These parameter changes enable the practical formation of diamond and plumber's nightmare structures that were previously only theoretical, making high-performance material properties achievable in practice
Solution Approach 2:
The invention performs preliminary chemical modification of the block copolymer terminals before self-assembly occurs. By pre-introducing terminal functional groups and controlling block ratios, the system is pre-configured to form specific network structures (diamond, plumber's nightmare) during self-assembly, rather than requiring complex post-processing or theoretical conditions
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 introduction of a double terminal substituent allows for the formation of thermodynamically stable 4 or more-fold network structures, such as diamond and plumber's nightmare structures, without requiring complex synthesis processes, enhancing processability and economic feasibility.
Implementation Method 1
A block copolymer is characterized by forming a microstructure of a nanometer unit by self-assembly by incompatibility between different blocks
Data Source
AI summary
Provided are a composition for forming a 4 or more-fold network structure including a block copolymer to the terminal of which a double terminal substituent selected from the following Chemical Formulae 1 and 2 is introduced and a self-assembly nanostructure in a thermodynamically stable state prepared therefrom:wherein L1 to L4, A1 to A4, R1, and R2 are as defined in the specification.