Hyperbranched Polyolefin Synthesis via ROMP
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Solution Overview
Problem
Current methods for synthesizing polyolefin materials with a high degree of branching are challenging due to limitations in controlling the branching structure, leading to random distribution and affected material properties.
Innovation Solution
A method involving polymerizing cyclic olefin monomers under specific catalyst conditions, with controlled parameters such as molar concentration, catalyst ratio, temperature, and reaction time, to achieve precise and controllable hyperbranched polyolefin synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chain walking polymerization method is used to synthesize polyolefin with high degree of branching, then the degree of branching is improved, but the control over branched structure is worsened due to random distribution
Solution Approach 1:
The patent employs metathesis polymerization instead of chain walking polymerization, fundamentally changing the reaction mechanism parameter. This allows precise control over branching structure through controlled ring-opening metathesis polymerization (ROMP) of cyclic olefin monomers, eliminating the random branching distribution inherent in chain walking methods while maintaining high degree of branching
Solution Approach 2:
The patent introduces cyclic olefin monomers as intermediary structures that enable controlled branching. These cyclic monomers serve as building blocks with predetermined structures that, when polymerized through metathesis, create polyolefins with controlled hyperbranched architectures rather than random branching patterns
2Productivity
If monomer concentration is increased to improve reaction efficiency, then productivity is improved, but the reaction becomes uncontrolled due to cross-linking
Solution Approach 1:
The patent identifies and controls the monomer concentration parameter within a specific range (0.2-2.0 mol/L) to optimize the reaction. This parameter control prevents excessive cross-linking while maintaining high reaction efficiency, resolving the contradiction between productivity and reaction control
3Speed
If catalyst ratio is increased to improve reaction rate, then speed is improved, but the molecular weight distribution becomes broader
Solution Approach 1:
The patent optimizes the catalyst to monomer molar ratio parameter within a specific range (1:100 to 1:1000) to achieve the desired balance. This controlled parameter adjustment allows the reaction to proceed at high rates while maintaining narrow molecular weight distribution, preventing the broadening effect that would occur with excessive catalyst
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 allows for the synthesis of polyolefin materials with controlled degree of branching, molecular weight, and molecular weight distribution, resulting in materials with low viscosity and good fluidity, suitable for applications in coatings, lubricants, and polymer processing.
Implementation Method 1
cyclic olefin monomer under catalyst conditions; wherein the cyclic olefin monomer is shown in formula I
Data Source
AI summary
A method for synthesizing polyolefin materials with a controlled degree of branching includes the following steps: polymerizing cyclic olefin monomers under catalyst conditions. The cyclic olefin monomer is shown in formula I, where n≥0, n is an integer. By changing monomers and reaction parameters such as reaction temperature, solvent type, catalyst concentration, monomer concentration and reaction time, the degree of branching, the molecular weight and molecular weight distribution of polyolefin can be controlled. Compared with the existing process, the present invention is a new polymerization process, which can prepare the hyperbranched polyolefin with precise and controllable branching structure. The polyolefin material prepared according to the present invention has advantages of a controlled degree of branching, low viscosity and good fluidity, which has broad application in coating, lubricant, polymer and process flow improvement technologies.