Free Radical Polymerization via Micro-Nano Bubble Cavitation
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Solution Overview
Problem
Existing free radical polymerization processes face challenges such as high energy consumption, complex operations, and the presence of residual initiators leading to poor polymer properties, along with inefficient production of porous polymers using traditional foaming agents.
Innovation Solution
Introduce micro-nano bubbles into a vinyl monomer solution to generate hydroxyl free radicals through cavitation, initiating polymerization without external stimuli and traditional initiators, resulting in a polymer with a micro-nano porous structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional initiators are used for polymerization, then polymerization activity is maintained, but residual initiator remains in the polymer causing low aging viscosity retention and poor long-term stability
Solution Approach 1:
The patent removes traditional initiators from the polymerization system entirely, replacing them with micro-nano bubble cavitation as the initiation source. This extraction of harmful initiators eliminates residual initiator contamination while maintaining polymerization activity through physical cavitation effects.
Solution Approach 2:
The patent replaces chemical initiation systems with a physical initiation system based on micro-nano bubble cavitation. The mechanical energy of collapsing bubbles generates free radicals that initiate polymerization, substituting chemical initiators with a physical field-based approach.
2Productivity
If photo initiation, thermal initiation, or high-energy ray irradiation is used, then polymerization can be initiated, but energy consumption is high
Solution Approach 1:
The patent uses inexpensive, easily generated micro-nano bubbles as the initiation source. These bubbles are transient and collapse quickly to generate initiating radicals, providing a low-cost, low-energy alternative to expensive photoinitiators, thermal initiators, or high-energy radiation systems.
3Temperature
If water is used as solvent during polymerization, then heat diffusion is facilitated and temperature control is easy, but large amount of energy is required for evaporation during drying
Solution Approach 1:
The patent introduces micro-nano bubbles that create a porous structure within the polymer matrix. This porous structure reduces the polymer's water content and surface tension, facilitating easier removal of water during drying and reducing the energy required for evaporation while maintaining good temperature control during polymerization.
4Shape
If traditional foaming agents are used to produce porous polymers, then pores are formed, but bubbles are large in diameter and not uniformly distributed
Solution Approach 1:
The patent segments the gas phase into micro-nano scale bubbles (1 μm to 1 nm) rather than using large bubbles from traditional foaming agents. This segmentation of the gas phase into extremely fine bubbles creates a uniform porous structure with consistent pore sizes distributed throughout the polymer matrix.
Solution Approach 2:
The patent changes the key parameter of bubble size from millimeter scale (traditional foaming) to micro-nano scale (1 μm to 1 nm). This dramatic parameter change in bubble dimensions, achieved through cavitation, creates uniformly distributed pores that provide both mechanical strength and enhanced mass/heat transfer properties.
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 method simplifies the polymerization process, reduces energy consumption, and produces polymers with low residual monomer content, high aging viscosity retention, and quick dissolution times, suitable for applications like oil reservoir recovery and offshore oil reservoir polymer flooding.
Implementation Method 1
introducing micro-nano bubbles of gas B into an aqueous solution of vinyl monomer(s), and initiating the free radical solution polymerization of the vinyl monomer(s) by the free radicals generated after the cavitation of the micro-nano bubbles
Data Source
AI summary
A free radical solution polymerization process, a polymer and a use thereof are provided. The polymerization process includes the steps of introducing micro-nano bubbles of gas B into an aqueous solution of vinyl monomer(s), and initiating the free radical solution polymerization of the vinyl monomer(s) by the free radicals generated after the cavitation of the micro-nano bubbles to prepare a polymer. The micro-nano bubbles can generate free radicals through cavitation without an external stimulus, thus initiating the free radical solution polymerization of the vinyl monomer(s) by the cavitation of the micro-nano bubbles.