Block Copolymer Stabilized Liquid-in-Solid Polymer Emulsion
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Solution Overview
Problem
Existing polymer compositions struggle to sustainably release liquid compounds with low compatibility, leading to rapid bleeding and short-term functionality due to phase separation and high diffusion rates, limiting their practical application in products like coatings and filters.
Innovation Solution
A liquid-in-solid polymer emulsion is formed using a block copolymer that phase-separates a thermoplastic polymer and a liquid compound, where one block is highly compatible with the polymer and another with the liquid, allowing the liquid compound to be stably enclosed and slowly released over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a liquid compound with low compatibility is added to a thermoplastic polymer, then the functional effect is enhanced, but rapid bleeding occurs on the surface in a short period of time
Solution Approach 1:
A block copolymer comprising a polyolefin block and a polystyrene block is introduced as an intermediary substance. The polystyrene block is compatible with the liquid compound (aromatic hydrocarbon) while the polyolefin block is compatible with the thermoplastic polymer matrix, creating a bridging effect that stabilizes the liquid compound within the polymer without rapid bleeding
Solution Approach 2:
The invention creates a composite system consisting of three components: thermoplastic polymer, block copolymer, and liquid compound. This composite structure leverages the compatibility characteristics of each component to achieve stable incorporation and controlled release of the liquid compound, preventing the phase separation and rapid bleeding that occurs in simple binary mixtures
2Duration of action of moving object
If a liquid compound is contained in a thermoplastic polymer, then functional effect is achieved, but the function disappears in several weeks at most due to rapid diffusion
Solution Approach 1:
The block copolymer acts as a mediating phase that retards the diffusion of the liquid compound from the polymer matrix. The polystyrene block interacts with the liquid compound through pi-pi stacking and van der Waals forces, creating a barrier that slows down the diffusion rate and extends the functional duration to several years
Solution Approach 2:
The invention changes the physical and chemical parameters of the system by introducing the block copolymer, which alters the diffusion kinetics of the liquid compound. The presence of the block copolymer modifies the free volume, interaction energies, and phase distribution, thereby controlling the release rate and extending the functional lifetime
3Reliability
If a block copolymer is added to stabilize liquid compound, then bleeding is suppressed and sustained release is achieved, but device complexity increases
Solution Approach 1:
The block copolymer content is optimized within a specific range (0.1-50 parts by weight per 100 parts of thermoplastic polymer) to achieve the desired balance between stability and complexity. This parameter optimization allows the system to function effectively with a controlled amount of additive, minimizing complexity while maintaining 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 stable incorporation and long-term release of liquid compounds, maintaining functionality for several years in various applications, including coatings and filters, with improved durability and performance.
Implementation Method 1
a block copolymer which phase-separates a thermoplastic polymer and a liquid compound
Implementation Method 2
the liquid compound is enclosed by the block copolymer (B) by a surfactant-like function of the block copolymer (B)
Implementation Method 3
sustainedly released such that the function of the liquid compound can last for a long period of time
Data Source
AI summary
The polymer composition comprises a polymer and a liquid compound having poor compatibility with the polymer. When the liquid compound is caused to be held in the polymer in a high concentration, a block copolymer having in the molecule a copolymerized polymer block unit having high compatibility with both of the matrix polymer and the liquid compound is incorporated and dispersed. As a result, the block copolymer serves like a surfactant to form an interface and the liquid compound is enclosed inside the interface to thereby form a liquid-in-solid polymer type emulsion.