SEEPS Triblock Copolymer Absorbent Mats
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Solution Overview
Problem
Current absorbents for hydrocarbon and low-polarity organic chemical spills lack improved elasticity and tensile strength, suffer from oil bleed, and are not cost-effective, while existing methods for forming thermoplastic elastomers require high temperatures and pressures, limiting their application.
Innovation Solution
The use of a low to medium molecular weight hydrogenated polystyrene-poly(isoprene+butadiene)-polystyrene triblock copolymer (SEEPS) with modified compression forming techniques at lower temperatures and pressures to create three-dimensional structures with enhanced absorbency and strength, reducing oil bleed and maintaining cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high temperatures and pressures are used to form thermoplastic elastomers, then the elastomers can be processed and molded, but the processing costs increase and the application is limited
Solution Approach 1:
The patent changes the molecular weight parameter of the triblock copolymer to low or medium range (50-500 kDa), which fundamentally alters the processing requirements. This parameter change enables the material to be molded at significantly lower temperatures (below melting point) and pressures compared to conventional high molecular weight thermoplastic elastomers, resolving the contradiction between manufacturability and energy consumption
2Reliability
If conventional triblock elastomers are used for spill absorption, then they can contain spills, but they lack improved elasticity and tensile strength
Solution Approach 1:
The patent employs a triblock copolymer composite structure (A-B-A) where block A is a hard segment (polystyrene or hydrogenated polystyrene) and block B is a soft segment (polyisoprene-polybutadiene copolymer). This composite architecture at the molecular level provides both the spill containment capability (through the hydrophobic soft segment) and improved elasticity and tensile strength (through the reinforced hard segment), resolving the contradiction between reliability and strength
3Quantity of substance
If absorbent materials are used for spill cleanup, then they can attract materials to pore spaces, but they suffer from oil bleed during absorption
Solution Approach 1:
The patent applies local quality by creating distinct regions within the polymer structure: the hard segments (polystyrene blocks) provide structural integrity and resistance to oil bleed, while the soft segments (polyisoprene-polybutadiene blocks) provide absorption capacity through their hydrophobic nature and pore structure. This spatial differentiation of functions within the single polymer chain resolves the contradiction between absorption capacity and oil bleed resistance
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 SEEPS triblock copolymer effectively absorbs hydrocarbons and low-polarity organic chemicals, forming mats with high tensile strength and minimal oil bleed, and can be used in various forms like mats, filters, and fuel sources, offering improved spill cleanup and energy generation capabilities.
Implementation Method 1
Adsorbents such as polypropylene fibers function by hydrophobic nature in water and oleophilic attraction of the oil to wick into the surface area of the fiber
Implementation Method 2
The SEEPS triblock copolymer effectively absorbs hydrocarbons and low-polarity organic chemicals, forming mats with high tensile strength and minimal oil bleed
Implementation Method 3
The block co-polymers of this patent application are comprised of blocks of crystalline and amorphous domains along the same polymer chain. The crystalline domain acts as the crystalline portion that give thermoplastic elastomers their thermoplastic character and the hydrogenated olefin amorphous domain provides the elastomeric character
Data Source
AI summary
The present invention relates to methods of recovering hydrocarbons or low polarity organic chemicals from hard surfaces, water and water surfaces, in their vapor state and from porous substrates. The hydrocarbons or low-polarity organic chemicals may be included in a spill. More particularly, the invention relates to the absorption of certain hydrocarbons and low-polarity organic chemicals by applying thermoplastic elastomers of a triblock copolymer of the general configuration A-B-A. The preferred A-B-A copolymer of the invention is a low to medium molecular weight hydrogenated polystyrene-poly(isoprene+butadiene)-polystyrene or polystyrene-b-ethylene/ethylene-propylene-b-styrene block copolymer. The method of forming a three-dimensional object from a hydrocarbon or low-polarity organic chemical absorbing substance includes: applying pressure to particles of a polymeric material comprising a styrene-ethylene/ethylene/propylene triblock copolymer containing from approximately 20 to 40 percent styrene, and; heating the particles for a period of time sufficient to form the three-dimensional object.