PEG Particle Dispersion Viscosity Stability
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Solution Overview
Problem
High molecular weight polyethylene glycol particles tend to flocculate and are insoluble in liquid polyalkylene glycol dispersions, leading to instability and limited viscosity range in pharmaceutical and industrial applications.
Innovation Solution
Forming stable dispersions by solidifying higher molecular weight polyethylene glycol particles within a liquid polyalkylene glycol solvent above the melting point and cooling to create complex, high surface area particles that remain suspended, thereby increasing the viscosity of the liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high molecular weight polyethylene glycol particles are used to increase viscosity, then the viscosity of the liquid increases, but the particles tend to flocculate and become insoluble, leading to dispersion instability
Solution Approach 1:
The patent applies parameter changes by controlling the molecular weight distribution of polyethylene glycol components. Specifically, it uses a combination of low molecular weight PEG (liquid component) and high molecular weight PEG (particle-forming component) in specific ratios. The high molecular weight component forms particles that increase viscosity, while the low molecular weight component ensures solubility and prevents flocculation, thus resolving the contradiction between viscosity enhancement and dispersion stability.
Solution Approach 2:
The patent creates a composite material system consisting of multiple polyethylene glycol components with different molecular weights. The composite comprises a liquid PEG component (molecular weight 200-700) and solid PEG particles (molecular weight 1,000-50,000) in specific weight ratios. This composite structure allows the system to simultaneously achieve high viscosity from the solid particles and stability from the liquid component that prevents flocculation.
2Force
If higher molecular weight polyethylene glycol is used to achieve desired viscosity range, then the viscosity increases, but the melting point increases and handling becomes difficult
Solution Approach 1:
The patent segments the polyethylene glycol system into two distinct functional components: a low molecular weight liquid PEG (molecular weight 200-700) that remains liquid at room temperature and provides ease of handling, and a high molecular weight solid PEG (molecular weight 1,000-50,000) that forms particles to increase viscosity. This segmentation allows each component to fulfill its specific function without the drawbacks of using only high molecular weight PEG.
Solution Approach 2:
The patent utilizes parameter changes in molecular weight to differentiate the functional roles of PEG components. By selecting low molecular weight PEG (200-700) as the liquid base and high molecular weight PEG (1,000-50,000) for particle formation, the system achieves a wide viscosity range while maintaining room temperature liquid state and ease of handling through the low melting point liquid component.
3Force
If polyethylene glycol particles are suspended in liquid polyalkylene glycol, then viscosity can be adjusted, but the particles are insoluble and tend to flocculate
Solution Approach 1:
The patent applies homogeneity by using polyethylene glycol particles and liquid polyalkylene glycol that are chemically similar (both polyethylene glycol-based). This chemical similarity ensures compatibility between the particle phase and continuous liquid phase, preventing flocculation while maintaining insolubility of particles in the liquid medium. The homogeneous chemical nature allows for stable suspension and easy manufacturing processes.
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 resulting stable dispersion provides a more viscous substitute for polyalkylene glycol liquids with equivalent solubility properties, enhancing the stability and handling of polyethylene glycol particles, and allowing for the suspension of insoluble organic particles.
Implementation Method 1
forming a melt blend of a room temperature solid polyethylene glycol at a temperature above the melting point of the polyethylene glycol in a solvent comprising liquid polyalkylene glycol and cooling the melt to resolidify solid polyethylene glycol particles
Implementation Method 2
a solvent and stably suspended polyethylene glycol particles wherein the solvent comprises liquid polyalkylene glycol
Data Source
AI summary
Stable dispersions of solid polyethylene glycol particles are described in polyalkylene glycol liquids. The stable dispersions have an increased viscosity relative to the liquids without the suspended particles. The stable dispersions can be formed from a melt of the polyethylene glycol particles mixed within the liquid.