Epoxide-Modified Diene Polymer for Rubber Strength and Hysteresis
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Solution Overview
Problem
Diene polymers modified with epoxy pendant groups improve the breaking properties of rubber compositions without compromising hysteresis properties, addressing the need for enhanced stress resistance and deformation in tire applications.
Innovation Solution
Incorporation of diene polymers with epoxy pendant groups into rubber compositions, specifically through grafting reactions using 1,3-dipolar compounds like nitrile oxides, to enhance crosslinking and interaction with reinforcing fillers like silica, thereby improving elastic properties and processing characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If diene polymers with epoxy pendant groups are introduced to improve breaking properties, then strength is improved, but hysteresis properties deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of diene polymers through specific epoxy pendant group configurations (formula I with specific R1-R6 groups) and controlling the degree of substitution (0.1-5 mol%). This chemical parameter modification enables simultaneous improvement of breaking properties while maintaining hysteresis properties, resolving the technical contradiction between strength and energy loss.
2Strength
If diene polymers with epoxy pendant groups are introduced to improve breaking properties, then strength is improved, but rolling resistance increases
Solution Approach 1:
The patent uses parameter changes by precisely controlling the epoxy pendant group structure (formula I with specific substituents) and their concentration (0.1-5 mol%). This optimized chemical composition achieves enhanced breaking properties while minimizing the increase in rolling resistance, effectively resolving the contradiction between strength improvement and harmful side effects.
3Strength
If crosslinking is enhanced to improve breaking properties, then strength is improved, but processing complexity increases
Solution Approach 1:
The patent applies self-service by incorporating epoxy pendant groups directly onto the diene polymer chains, which then automatically participate in crosslinking reactions with crosslinking agents. This built-in functionality eliminates the need for complex external crosslinking systems or multiple processing steps, achieving enhanced breaking properties while simplifying the overall crosslinking process.
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 modified rubber compositions exhibit improved elongation at break, stress at break, and reduced hysteresis, ensuring better performance and processing ease for tire applications without increasing rolling resistance.
Implementation Method 1
these functional polymers, in particular elastomers, can be used crosslinked in a rubber composition, the presence of the pendant glycidyl groups making it possible to crosslink the diene polymer in the presence of a crosslinking agent other than sulfur
Implementation Method 2
Incorporation of diene polymers with epoxy pendant groups into rubber compositions, specifically through grafting reactions using 1,3-dipolar compounds like nitrile oxides
Data Source
AI summary
The present invention relates to a diene polymer comprising at least one specific epoxide pendent group, one of the carbon atoms of which both has an attachment to the polymer chain and is a trisubstituted carbon, and the other carbon atom of which is an at least trisubstituted carbon. The introduction of such a polymer, in particular elastomer, into a rubber composition makes it possible to improve the properties at break of said composition, without being to the detriment of the hysteresis properties thereof, while at the same time improving the processing thereof.